WO2021074972A1 - Antenna device and wireless communication apparatus - Google Patents

Antenna device and wireless communication apparatus Download PDF

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Publication number
WO2021074972A1
WO2021074972A1 PCT/JP2019/040510 JP2019040510W WO2021074972A1 WO 2021074972 A1 WO2021074972 A1 WO 2021074972A1 JP 2019040510 W JP2019040510 W JP 2019040510W WO 2021074972 A1 WO2021074972 A1 WO 2021074972A1
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WIPO (PCT)
Prior art keywords
antenna
conductor element
ground
ground substrate
antenna device
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PCT/JP2019/040510
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French (fr)
Japanese (ja)
Inventor
貴裕 篠島
洋平 古賀
泰光 伴
旅人 殿岡
聡史 ▲崎▼田
学 吉川
Original Assignee
富士通コネクテッドテクノロジーズ株式会社
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Priority to JP2021552018A priority Critical patent/JP7457225B2/en
Priority to PCT/JP2019/040510 priority patent/WO2021074972A1/en
Publication of WO2021074972A1 publication Critical patent/WO2021074972A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set

Definitions

  • the present invention relates to an antenna device and a wireless communication device.
  • Wireless communication devices such as smartphones, tablet computers, and vehicles equipped with in-vehicle antennas perform communication using a plurality of frequency bands in order to realize high-speed communication, for example. Therefore, the wireless communication device is equipped with antenna elements corresponding to a plurality of frequency bands.
  • Patent Document 1 describes an antenna element corresponding to a plurality of frequency bands by providing a plurality of switches on the loop antenna.
  • the structure of the antenna becomes complicated by providing a plurality of switches, so that it is not easy to miniaturize the antenna.
  • Wireless communication devices are being further enhanced in functionality and further miniaturized. As wireless communication devices become more sophisticated and smaller, the space for installing antenna devices in wireless communication devices is becoming narrower. Therefore, a small antenna device that can operate at a plurality of frequencies is desired.
  • One aspect of the disclosed technology is to provide an antenna device and a wireless communication device equipped with the antenna device, which can operate at a plurality of frequencies and can be manufactured in a small size.
  • the antenna device has a ground board, a feeding point provided on the ground board, and the ground having one end electrically connected to the feeding point and the other end electrically connected to the ground board.
  • the first conductor element parallel to the substrate and the other end of the first conductor element further extend toward the other and gradually approach the ground substrate and are electrically connected to the ground substrate.
  • a second conductor element is provided.
  • an antenna device that can support a plurality of frequencies and can be further miniaturized, and a wireless communication device on which the antenna device is mounted.
  • FIG. 1 is a diagram illustrating an antenna according to an embodiment.
  • FIG. 2 is a diagram schematically showing a loop antenna operating on the antenna according to the embodiment.
  • FIG. 3 is a diagram illustrating an antenna according to the first modification.
  • FIG. 4 is a diagram illustrating an antenna according to the second modification.
  • FIG. 5 is a first diagram schematically showing a monopole antenna operating on the antenna according to the second modification.
  • FIG. 6 is a second diagram schematically showing a monopole antenna operating on the antenna according to the second modification.
  • FIG. 7 is a third diagram schematically showing a monopole antenna operating on the antenna according to the second modification.
  • FIG. 8 is a fourth diagram schematically showing a monopole antenna operating on the antenna according to the second modification.
  • FIG. 1 is a diagram illustrating an antenna according to an embodiment.
  • FIG. 2 is a diagram schematically showing a loop antenna operating on the antenna according to the embodiment.
  • FIG. 3 is a diagram illustrating an antenna according to the
  • FIG. 9 is a diagram illustrating an antenna according to the third modification.
  • FIG. 10 is a diagram schematically showing a loop antenna operating on the antenna according to the third modification.
  • FIG. 11 is a diagram illustrating an antenna according to the third modification.
  • FIG. 12 is a diagram showing an example in which the antenna according to the third modification is applied to a smartphone.
  • the antenna device according to the present embodiment has, for example, the following configuration.
  • the antenna device according to this embodiment is With the ground board A feeding point provided on the ground board and A first conductor element parallel to the ground substrate, one end of which is electrically connected to the feeding point and the other end of which is electrically connected to the ground substrate.
  • a second conductor element that extends from the other end of the first conductor element toward the other and gradually approaches the ground substrate and is electrically connected to the ground substrate is provided.
  • the ground board is a grounded board.
  • the first conductor element and the second conductor element are grounded by being electrically connected to the ground substrate.
  • the path from the feeding point to the ground substrate via the first conductor element and the second conductor element operates as a first loop antenna that resonates at the first frequency.
  • the path from the feeding point to the ground substrate via the first conductor element operates as a second loop antenna that resonates at a second frequency different from the first frequency.
  • the path from the ground substrate to the ground substrate via the second conductor element connected to the other end of the first conductor element resonates at the first frequency and a third frequency different from the second frequency. Operates as a loop antenna of 3.
  • the capacitance coupling between the second conductor element and the ground substrate is larger than that in the case where the second conductor element is provided parallel to the ground substrate. Can be increased. With such a feature, the antenna lengths of the first loop antenna and the second loop antenna can be miniaturized, and the antenna device can be miniaturized.
  • the antenna device may further have the following features.
  • the first conductor element is further electrically connected to the ground substrate at one or more locations between the one end and the other end.
  • An antenna device having such a feature can increase the number of loop antennas operating in the antenna device.
  • a loop antenna for example, a loop antenna formed by a path from the feeding point to the ground substrate from the portion of the first conductor element can be mentioned.
  • a loop antenna formed by a path from the ground substrate, the relevant portion, and the other end of the first conductor element to the ground substrate can also be mentioned.
  • the antenna device may further have the following features. Capacitors or inductors are provided on at least one of the electrical path between the first conductor element and the ground substrate and the electrical path between the second conductor element and the ground substrate. An antenna device having such characteristics operates in the antenna device without changing the lengths of the first conductor element and the second conductor element by appropriately adjusting the capacitance of the capacitor and the inductance of the inductor. The resonance frequency of each loop antenna can be changed.
  • the antenna device may further have the following features.
  • a parallel resonant circuit including a capacitor and an inductor on at least one of the electrical path between the first conductor element and the ground substrate and the electrical path between the second conductor element and the ground substrate.
  • the antenna device having such a feature sets the first conductor element and the second conductor element to any of the first frequency, the second frequency, and the third frequency by appropriately setting the resonance frequency of the parallel resonance circuit. It can also be operated as a monopole antenna operating at a different fourth frequency.
  • the antenna device may also be electrically connected between the first conductor element and the ground substrate by a spring contact.
  • the spring contact By adopting the spring contact, the electrical connection between the first conductor element and the ground substrate can be more reliably realized.
  • the antenna device may further have the following features.
  • the antenna device is mounted on a mobile terminal device, and at least a part of the first conductor element is formed by a metal frame which is an exterior of the mobile terminal device.
  • the mobile terminal device include a mobile phone, a smartphone, a tablet-side computer, a wearable computer, and the like.
  • the disclosed technology may be a wireless communication device equipped with an antenna device having at least one of the above features.
  • FIG. 1 is a diagram illustrating an antenna according to an embodiment.
  • the antenna 1 illustrated in FIG. 1 includes a feeder line 11, a first conductor element 12, a second conductor element 13, a third conductor element 14, and a ground substrate 3.
  • the right side toward FIG. 1 is referred to as + X direction
  • the left side toward FIG. 1 is referred to as ⁇ X direction
  • the upper side toward FIG. 1 is referred to as + Y direction
  • the lower side toward FIG. 1 is referred to as ⁇ Y direction. ..
  • the ground board 3 has a ground surface 3a that is grounded.
  • the ground board 3 may be, for example, a printed circuit board on which various electronic components are mounted.
  • the ground board 3 also includes a feeding point 2 that supplies power to the antenna 1.
  • the entire surface of the ground substrate 3 may be the ground surface 3a.
  • the first conductor element 12 is a conductor element that extends at a position separated from the ground substrate 3 by a predetermined distance substantially parallel to the ground surface 3a of the ground substrate 3.
  • the end of the first conductor element 12 in the + X direction is electrically connected to the feeding point 2 by the feeding line 11.
  • the first conductor element 12 and the feeder line 11 are substantially orthogonal to each other.
  • the second conductor element 13 is a conductor element that electrically connects the end portion of the first conductor element 12 in the ⁇ X direction and the ground surface 3a of the ground substrate 3.
  • the second conductor element 13 is substantially orthogonal to the first conductor element 12 and the ground substrate 3.
  • the end of the second conductor element 13 in the + Y direction is electrically connected to the first conductor element 12, and the end in the ⁇ Y direction is electrically connected to the ground surface 3a.
  • the portion where the second conductor element 13 is connected to the ground surface 3a is referred to as a ground 31 for convenience.
  • the second conductor element 13 may be a spring contact.
  • the third conductor element 14 is a conductor element extending from the end portion of the first conductor element 12 in the ⁇ X direction toward the ground surface 3a of the substrate 3.
  • the third conductor element 14 asymptotically approaches the ground surface 3a as it extends in the ⁇ X direction from the end portion of the first conductor element 12 in the ⁇ X direction, and is electrically connected to the ground surface 3a.
  • the third conductor element 14 is formed in an arc shape, but the third conductor element 14 is not limited to the arc shape.
  • the third conductor element 14 may be asymptotic to the ground surface 3a as it extends in the ⁇ X direction, and may be, for example, a straight line.
  • the third conductor element 14 is electrically connected to the ground surface 3a at a position further deviated in the ⁇ X direction from the end portion of the first conductor element 12 in the ⁇ X direction. Since the third conductor element 14 is asymptotic to the ground surface 3a, the capacitive coupling between the third conductor element 14 and the ground surface 3a can be strengthened.
  • the portion where the third conductor element 14 is connected to the ground surface 3a is referred to as a ground 32 for convenience.
  • FIG. 2 is a diagram schematically showing a loop antenna operating on the antenna according to the embodiment.
  • the antenna 1 according to the embodiment includes three loop antennas 101, 102, and 103.
  • the loop antenna 101, power supply line 11 from the feeding point 2, first conductor element 12, a length of up to ground 32 through the second conductive element 13 and the third conductive element 14 is a wavelength lambda 1 of the frequency f 1 1/2 by setting such a wavelength, it operates as a loop antenna for the frequency f 1.
  • the loop antenna 102 is set so that the length from the feeding point 2 through the feeding line 11, the first conductor element 12, and the second conductor element 13 to the ground 31 is 1/2 wavelength of the wavelength ⁇ 2 of the frequency f 2. by being, it operates as a loop antenna for the frequency f 2.
  • Loop antenna 103 the length of the third conductive element 14, and the second conductive element 13, that is set to be 1/2 wavelength of the wavelength lambda 3 of the frequency f 3, a loop for the frequency f 3 Operates as an antenna.
  • the antenna lengths of the loop antennas 101, 102, and 103 are (antenna length of the loop antenna 101)> (antenna length of the loop antenna 102)> (antenna length of the loop antenna 103). Therefore, (frequency f 3 )> (frequency f 2 )> (frequency f 1 ). In this way, the antenna 1 can resonate with respect to the three frequencies f 1 , f 2 , and f 3 , and the antenna length of the entire antenna 1 can be suppressed to 1/2 wavelength of the frequency f 1.
  • FIG. 3 is a diagram illustrating an antenna according to the first modification.
  • a capacitor 41 is provided between the second conductor element 13 and the ground 31, and an inductor 42 is provided between the third conductor element 14 and the ground 32.
  • the capacitor 41 is, for example, a shortening capacitor.
  • the electrical antenna lengths of the loop antennas 102 and 103 can be shortened. That is, by providing the capacitor 41 between the second conductor element 13 and the ground 31, the frequency of the loop antenna 102 is resonant and higher than the frequency f 2, than the frequency f 3 the frequency loop antenna 103 resonates Can be high.
  • the inductor 42 is, for example, an extension coil.
  • the electrical antenna lengths of the loop antennas 101 and 103 can be lengthened. That is, the inductor 42 that provided between the third conductive element 14 and the ground 32, the frequency of the loop antenna 101 is resonant and lower than the frequency f 1, than the frequency f 3 the frequency loop antenna 103 resonates Can be lowered.
  • the capacitor 41 and the inductor 42 can change the electrical antenna length without changing the actual antenna length, and thus the frequency at which the loop antennas 101, 102, and 103 resonate. Can be changed.
  • FIG. 4 is a diagram illustrating an antenna according to the second modification.
  • a parallel resonance circuit 51 is provided between the second conductor element 13 and the ground terminal 31, and a parallel resonance circuit 52 is provided between the third conductor element 14 and the ground terminal 32. Be done.
  • the parallel resonant circuits 51 and 52 are circuits in which an inductor and a capacitor are connected in parallel.
  • the resonance frequencies of the parallel resonant circuits 51 and 52 can be appropriately set based on the inductance of the inductor and the capacitance of the capacitor.
  • the antenna 1c can be operated as a plurality of monopole antennas by appropriately setting the resonance frequencies of the parallel resonance circuits 51 and 52.
  • FIG. 5 to 8 are diagrams schematically showing a monopole antenna operating on the antenna according to the second modification.
  • FIG. 5 illustrates a monopole antenna 101b
  • FIG. 6 illustrates a monopole antenna 102b
  • FIG. 7 illustrates a monopole antenna 103b
  • FIG. 8 illustrates a monopole antenna 104b.
  • the monopole antenna 101b is the feed line 11, the first conductive element 12, the third conductive element 14, formed by the parallel resonant circuit 52 and the ground terminal 31, the resonance frequency f 11 It is a monopole antenna.
  • the monopole antenna 102b may feed line 11, formed by the first conductive element 12 and the third conductive element 14, a monopole antenna which resonates with the frequency f 12.
  • the monopole antenna 103b is a monopole antenna formed by the feeder line 11, the first conductor element 12, and the second conductor element 13 and resonating with the frequency f13.
  • the monopole antenna 104b is a monopole antenna formed by the second conductor element 13 and the third conductor element 14 and resonating at the frequency f14.
  • the antenna lengths of the monopole antennas 101b, 102b, 103b, and 104b are (antenna length of the monopole antenna 101b)> (antenna length of the monopole antenna 102b)> (mono).
  • the frequencies at which the monopole antennas 101b, 102b, 103b, and 104b resonate are (frequency f 14 )> (frequency f 13 )> (frequency f 12 )> (frequency f 11 ). That is, the antenna 1b can resonate at four different frequencies (frequency f 11 , frequency f 12 , frequency f 13 and frequency f 14).
  • FIG. 9 is a diagram illustrating an antenna according to the third modification.
  • the branch point 12a and the ground surface 3a between the ⁇ X side end portion and the + X side end portion of the first conductor element 12 are electrically formed by the fourth conductor element 13a. It differs from the antenna 1 according to the embodiment in that it is connected.
  • the portion where the fourth conductor element 13a and the ground surface 3a are connected is referred to as a ground 33.
  • FIG. 10 is a diagram schematically showing a loop antenna operating on the antenna according to the third modification.
  • the antenna 1c according to the third modification has loop antennas 301 and 302 in addition to the loop antennas 101, 102 and 103.
  • the loop antenna 301 is a half-wavelength loop antenna formed by a path from the feed point 2 to the ground 33 via the feed line 11, the first conductor element 12, the branch point 12a, and the fourth conductor element 13a.
  • the loop antenna 302 is a half-wavelength loop antenna formed by a path from the ground 33 to the ground 31 via the branch point 12a, the first conductor element, and the second conductor element 13.
  • the ground surface 3a is formed from one branch point 12a provided between the ⁇ X side end portion and the + X side end portion of the first conductor element 12 by the fourth conductor element 13a. Although it is electrically connected, a plurality of branch points may be provided, and each of the plurality of branch points and the ground surface 3a may be electrically connected by a conductor element. By adopting such a design, the number of loop antennas operating on the antenna 1c can be further increased.
  • FIG. 11 is a diagram illustrating an antenna according to the third modification.
  • the antenna 1d illustrated in FIG. 11 is different from the antenna 1 according to the embodiment in that the third conductor element 14 is the third conductor element 14a.
  • the third conductor element 14a differs from the third conductor element 14 in that it reaches the side surface of the ground substrate 3 and then bends to electrically connect to the ground surface 3b provided on the side surface of the ground substrate 3.
  • a ground 32a the portion where the third conductor element 14a is connected to the ground surface 3b provided on the side surface of the ground substrate 3 is referred to as a ground 32a.
  • FIG. 12 is a diagram showing an example in which the antenna according to the third modification is applied to a smartphone.
  • FIG. 12 illustrates a state in which the case on the display side of the smartphone 500 is opened.
  • the smartphone 500 is a portable information processing device equipped with a processor, memory, and the like.
  • the smartphone 500 wirelessly communicates with an external device using the antenna 1d.
  • a frame-shaped metal frame 51 surrounds the side surface (periphery) thereof.
  • the metal frame 51 is an exterior covering the side surface of the smartphone 500.
  • the corners of the metal frame 51 are formed in a round arc shape.
  • the ground substrate 3 is housed in the area defined by the metal frame 51.
  • a speaker used for telephone calls is provided on the upper side (+ Y side), and a microphone used for telephone calls is provided on the lower side (-Y side).
  • the antenna 1d is used as the antenna 1d.
  • the antenna 1d is provided on the upper side of the smartphone 500.
  • slits 511 and 512 are provided between the region of the metal frame 51 used as the antenna 1d and another region.
  • the first conductor element 511 is electrically separated from the region of the metal frame 51 that is not used as the antenna 1d by the slit 511.
  • the third conductor element 14a is electrically separated from the region of the metal frame 51 that is not used as the antenna 1d by the slit 512.
  • the corner portion formed on the arc in the metal frame 51 is used as the third conductor element 14a. In this way, by using the metal frame 51 as the conductor element of the antenna 1d, it is possible to reduce the area occupied by the antenna 1d in the area defined by the metal frame 51.

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Abstract

Provided are: an antenna device which can be manufactured in a small size and operated in a plurality of frequencies; and a wireless communication apparatus to which the antenna device is mounted. This antenna device is provided with: a ground substrate; a power supply point set on the ground substrate; a first conductor element that is electrically connected at one end to the power supply point, that is electrically connected at the other end to the ground substrate, and that is parallel to the ground substrate; and a second conductor element that extends from the other end of the first conductor element toward the other and gradually comes close to the ground substrate so as to be electrically connected to the ground substrate.

Description

アンテナ装置および無線通信装置Antenna device and wireless communication device
　本発明は、アンテナ装置および無線通信装置に関する。 The present invention relates to an antenna device and a wireless communication device.
　スマートフォン、タブレット型コンピュータ、車載用アンテナを備えた車両等の無線通信装置は、例えば高速通信を実現するために、複数の周波数帯を用いた通信を行っている。そのため、無線通信装置には、複数の周波数帯に対応するアンテナ素子が搭載されている。 Wireless communication devices such as smartphones, tablet computers, and vehicles equipped with in-vehicle antennas perform communication using a plurality of frequency bands in order to realize high-speed communication, for example. Therefore, the wireless communication device is equipped with antenna elements corresponding to a plurality of frequency bands.
　特許文献１には、ループアンテナに複数のスイッチを設けることで複数の周波数帯に対応させたアンテナ素子が記載されている。特許文献１に記載の技術では、複数のスイッチを設けることでアンテナの構造が複雑になるため、アンテナの小型化は容易ではない。 Patent Document 1 describes an antenna element corresponding to a plurality of frequency bands by providing a plurality of switches on the loop antenna. In the technique described in Patent Document 1, the structure of the antenna becomes complicated by providing a plurality of switches, so that it is not easy to miniaturize the antenna.
国際公開２００４／０４７２２３号International Publication No. 2004/0472223
　無線通信装置は、一層の高機能化、そして、より一層の小型化が進められている。無線通信装置の高機能化および小型化が進められることで、無線通信装置内にアンテナ装置を設けるスペースは狭くなる一方である。そのため、複数の周波数で動作可能であるとともに小型のアンテナ装置が望まれている。 Wireless communication devices are being further enhanced in functionality and further miniaturized. As wireless communication devices become more sophisticated and smaller, the space for installing antenna devices in wireless communication devices is becoming narrower. Therefore, a small antenna device that can operate at a plurality of frequencies is desired.
　開示の技術の１つの側面は、複数の周波数で動作可能であるとともに、小型に製造可能はアンテナ装置および当該アンテナ装置を実装した無線通信装置を提供することを目的とする。 One aspect of the disclosed technology is to provide an antenna device and a wireless communication device equipped with the antenna device, which can operate at a plurality of frequencies and can be manufactured in a small size.
　開示の技術の１つの側面は、次のようなアンテナ装置によって例示される。本アンテナ装置は、グランド基板と、前記グランド基板に設けられる給電点と、一方の端部が前記給電点と電気的に接続し、他方の端部が前記グランド基板と電気的に接続する前記グランド基板に対して平行な第１導体素子と、前記第１導体素子の前記他方の端部から、さらに前記他方に向けて延びるとともに徐々に前記グランド基板に漸近して前記グランド基板と電気的に接続する第２導体素子と、を備える。 One aspect of the disclosed technology is illustrated by the following antenna devices. The antenna device has a ground board, a feeding point provided on the ground board, and the ground having one end electrically connected to the feeding point and the other end electrically connected to the ground board. The first conductor element parallel to the substrate and the other end of the first conductor element further extend toward the other and gradually approach the ground substrate and are electrically connected to the ground substrate. A second conductor element is provided.
　開示の技術によれば、複数の周波数に対応するとともに、より小型化が可能なアンテナ装置および当該アンテナ装置を実装した無線通信装置を提供することができる。 According to the disclosed technology, it is possible to provide an antenna device that can support a plurality of frequencies and can be further miniaturized, and a wireless communication device on which the antenna device is mounted.
図１は、実施形態に係るアンテナを例示する図である。FIG. 1 is a diagram illustrating an antenna according to an embodiment. 図２は、実施形態に係るアンテナ上で動作するループアンテナを模式的に示す図である。FIG. 2 is a diagram schematically showing a loop antenna operating on the antenna according to the embodiment. 図３は、第１変形例に係るアンテナを例示する図である。FIG. 3 is a diagram illustrating an antenna according to the first modification. 図４は、第２変形例に係るアンテナを例示する図である。FIG. 4 is a diagram illustrating an antenna according to the second modification. 図５は、第２変形例に係るアンテナ上で動作するモノポールアンテナを模式的に示す第１の図である。FIG. 5 is a first diagram schematically showing a monopole antenna operating on the antenna according to the second modification. 図６は、第２変形例に係るアンテナ上で動作するモノポールアンテナを模式的に示す第２の図である。FIG. 6 is a second diagram schematically showing a monopole antenna operating on the antenna according to the second modification. 図７は、第２変形例に係るアンテナ上で動作するモノポールアンテナを模式的に示す第３の図である。FIG. 7 is a third diagram schematically showing a monopole antenna operating on the antenna according to the second modification. 図８は、第２変形例に係るアンテナ上で動作するモノポールアンテナを模式的に示す第４の図である。FIG. 8 is a fourth diagram schematically showing a monopole antenna operating on the antenna according to the second modification. 図９は、第３変形例に係るアンテナを例示する図である。FIG. 9 is a diagram illustrating an antenna according to the third modification. 図１０は、第３変形例に係るアンテナ上で動作するループアンテナを模式的に示す図である。FIG. 10 is a diagram schematically showing a loop antenna operating on the antenna according to the third modification. 図１１は、第３変形例に係るアンテナを例示する図である。FIG. 11 is a diagram illustrating an antenna according to the third modification. 図１２は、第３変形例に係るアンテナをスマートフォンに適用した例を示す図である。FIG. 12 is a diagram showing an example in which the antenna according to the third modification is applied to a smartphone.
　以下、実施形態について説明する。以下に示す実施形態の構成は例示であり、開示の技術は実施形態の構成に限定されない。本実施形態に係るアンテナ装置は、例えば、以下の構成を備える。
　本実施形態に係るアンテナ装置は、
　グランド基板と、
　前記グランド基板に設けられる給電点と、
　一方の端部が前記給電点と電気的に接続し、他方の端部が前記グランド基板と電気的に接続する前記グランド基板に対して平行な第１導体素子と、
　前記第１導体素子の前記他方の端部から、さらに前記他方に向けて延びるとともに徐々に前記グランド基板に漸近して前記グランド基板と電気的に接続する第２導体素子と、を備える。 Hereinafter, embodiments will be described. The configurations of the embodiments shown below are examples, and the disclosed technology is not limited to the configurations of the embodiments. The antenna device according to the present embodiment has, for example, the following configuration.
The antenna device according to this embodiment is
With the ground board
A feeding point provided on the ground board and
A first conductor element parallel to the ground substrate, one end of which is electrically connected to the feeding point and the other end of which is electrically connected to the ground substrate.
A second conductor element that extends from the other end of the first conductor element toward the other and gradually approaches the ground substrate and is electrically connected to the ground substrate is provided.
　グランド基板は接地された基板である。第１導体素子および第２導体素子は、グランド基板と電気的に接続されることで、接地される。給電点から第１導体素子および第２導体素子を介してグランド基板に至る経路は、第１の周波数で共振する第１のループアンテナとして動作する。給電点から第１導体素子を介してグランド基板に至る経路は、第１の周波数とは異なる第２の周波数で共振する第２のループアンテナとして動作する。グランド基板から第１導体素子の他方の端部に接続された第２導体素子を介してグランド基板に至る経路は、第１の周波数および第２の周波数とは異なる第３の周波数で共振する第３のループアンテナとして動作する。また、第２導体素子が他方に向けて延びるとともに徐々にグランド基板に漸近することで、第２導体素子をグランド基板と平行に設けた場合よりも、第２導体素子とグランド基板との容量結合を大きくすることができる。このような特徴により、第１のループアンテナおよび第２のループアンテナのアンテナ長さを小型化でき、ひいては、アンテナ装置の小型化を実現できる。 The ground board is a grounded board. The first conductor element and the second conductor element are grounded by being electrically connected to the ground substrate. The path from the feeding point to the ground substrate via the first conductor element and the second conductor element operates as a first loop antenna that resonates at the first frequency. The path from the feeding point to the ground substrate via the first conductor element operates as a second loop antenna that resonates at a second frequency different from the first frequency. The path from the ground substrate to the ground substrate via the second conductor element connected to the other end of the first conductor element resonates at the first frequency and a third frequency different from the second frequency. Operates as a loop antenna of 3. Further, since the second conductor element extends toward the other side and gradually approaches the ground substrate, the capacitance coupling between the second conductor element and the ground substrate is larger than that in the case where the second conductor element is provided parallel to the ground substrate. Can be increased. With such a feature, the antenna lengths of the first loop antenna and the second loop antenna can be miniaturized, and the antenna device can be miniaturized.
　本アンテナ装置は、さらに、次の特徴を備えてもよい。前記第１導体素子は、さらに、前記一方の端部から前記他方の端部の間の一か所以上の箇所において、前記グランド基板と電気的に接続される。このような特徴を備えるアンテナ装置は、アンテナ装置内で動作するループアンテナを増やすことができる。このようなループアンテナとして、例えば、給電点から第１導体素子の当該箇所からグランド基板に向かう経路によって形成されるループアンテナを挙げることができる。また、このようなループアンテナとして、グランド基板、当該箇所、第１導体素子の他方の端部からグランド基板に向かう経路によって形成されるループアンテナも挙げることができる。 The antenna device may further have the following features. The first conductor element is further electrically connected to the ground substrate at one or more locations between the one end and the other end. An antenna device having such a feature can increase the number of loop antennas operating in the antenna device. As such a loop antenna, for example, a loop antenna formed by a path from the feeding point to the ground substrate from the portion of the first conductor element can be mentioned. Further, as such a loop antenna, a loop antenna formed by a path from the ground substrate, the relevant portion, and the other end of the first conductor element to the ground substrate can also be mentioned.
　本アンテナ装置は、さらに、次の特徴を備えてもよい。前記第１導体素子と前記グランド基板との間の電気的な経路上および前記第２導体素子と前記グランド基板との間の電気的な経路上の少なくとも一方に、キャパシタまたはインダクタが設けられる。このような特徴を備えるアンテナ装置は、キャパシタの静電容量やインダクタのインダクタンスを適宜調整することで、第１導体素子および第２導体素子の長さを変更することなく、アンテナ装置内で動作する各ループアンテナの共振周波数を変更することができる。 The antenna device may further have the following features. Capacitors or inductors are provided on at least one of the electrical path between the first conductor element and the ground substrate and the electrical path between the second conductor element and the ground substrate. An antenna device having such characteristics operates in the antenna device without changing the lengths of the first conductor element and the second conductor element by appropriately adjusting the capacitance of the capacitor and the inductance of the inductor. The resonance frequency of each loop antenna can be changed.
　本アンテナ装置は、さらに、次の特徴を有してもよい。前記第１導体素子と前記グランド基板との間の電気的な経路上および前記第２導体素子と前記グランド基板との間の電気的な経路上の少なくとも一方に、キャパシタおよびインダクタを含む並列共振回路が設けられる。このような特徴を備えるアンテナ装置は、並列共振回路の共振周波数を適宜設定することで、第１導体素子や第２導体素子を第１の周波数、第２の周波数および第３の周波数のいずれとも異なる第４の周波数で動作するモノポールアンテナとしても動作させることが可能となる。 The antenna device may further have the following features. A parallel resonant circuit including a capacitor and an inductor on at least one of the electrical path between the first conductor element and the ground substrate and the electrical path between the second conductor element and the ground substrate. Is provided. The antenna device having such a feature sets the first conductor element and the second conductor element to any of the first frequency, the second frequency, and the third frequency by appropriately setting the resonance frequency of the parallel resonance circuit. It can also be operated as a monopole antenna operating at a different fourth frequency.
　本アンテナ装置は、また、前記第１導体素子と前記グランド基板との間は、ばね接点によって電気的に接続されてもよい。ばね接点を採用することで、第１導体素子とグランド基板との電気的な接続をより確実に実現することができる。 The antenna device may also be electrically connected between the first conductor element and the ground substrate by a spring contact. By adopting the spring contact, the electrical connection between the first conductor element and the ground substrate can be more reliably realized.
　本アンテナ装置は、さらに、次の特徴を有してもよい。前記アンテナ装置は、携帯端末装置に実装され、前記第１導体素子の少なくとも一部は、前記携帯端末装置の外装である金属フレームによって形成される。携帯端末装置としては、例えば、携帯電話、スマートフォン、タブレット側コンピュータ、ウェアラブルコンピュータ等を挙げることができる。携帯端末装置の外装である金属フレームを第１導体素子としても用いることで、金属フレームが区画する領域内においてアンテナ装置が占める領域を減少させることができる。そのため、このような特徴を備えるアンテナ装置は、携帯端末装置を小型化させたり、より多くの電子部品を携帯端末装置に実装させたりすることができる。 The antenna device may further have the following features. The antenna device is mounted on a mobile terminal device, and at least a part of the first conductor element is formed by a metal frame which is an exterior of the mobile terminal device. Examples of the mobile terminal device include a mobile phone, a smartphone, a tablet-side computer, a wearable computer, and the like. By using the metal frame that is the exterior of the mobile terminal device as the first conductor element, it is possible to reduce the area occupied by the antenna device in the area defined by the metal frame. Therefore, the antenna device having such a feature can reduce the size of the mobile terminal device and mount more electronic components on the mobile terminal device.
　また、開示の技術は、上記少なくともいずれかの特徴を備えるアンテナ装置を実装した無線通信装置であってもよい。 Further, the disclosed technology may be a wireless communication device equipped with an antenna device having at least one of the above features.
　以下、図面を参照して実施形態についてさらに説明する。図１は、実施形態に係るアンテナを例示する図である。図１に例示されるアンテナ１は、給電線１１、第１導体素子１２、第２導体素子１３、第３導体素子１４およびグランド基板３を含む。以下、本明細書において、図１に向かって右側を＋Ｘ方向、図１に向かって左側を－Ｘ方向、図１に向かって上を＋Ｙ方向、図１に向かって下を－Ｙ方向と称する。 Hereinafter, the embodiment will be further described with reference to the drawings. FIG. 1 is a diagram illustrating an antenna according to an embodiment. The antenna 1 illustrated in FIG. 1 includes a feeder line 11, a first conductor element 12, a second conductor element 13, a third conductor element 14, and a ground substrate 3. Hereinafter, in the present specification, the right side toward FIG. 1 is referred to as + X direction, the left side toward FIG. 1 is referred to as −X direction, the upper side toward FIG. 1 is referred to as + Y direction, and the lower side toward FIG. 1 is referred to as −Y direction. ..
　グランド基板３は、接地されたグランド面３ａを有する。グランド基板３は、例えば、各種電子部品を実装するプリント基板であってもよい。グランド基板３は、アンテナ１への給電を行う給電点２も備える。グランド基板３の全面がグランド面３ａであってもよい。 The ground board 3 has a ground surface 3a that is grounded. The ground board 3 may be, for example, a printed circuit board on which various electronic components are mounted. The ground board 3 also includes a feeding point 2 that supplies power to the antenna 1. The entire surface of the ground substrate 3 may be the ground surface 3a.
　第１導体素子１２は、グランド基板３から所定距離離れた位置を、グランド基板３のグランド面３ａに対して略平行に延びる導体素子である。第１導体素子１２の＋Ｘ方向の端部は給電線１１によって給電点２と電気的に接続される。図１では、第１導体素子１２と給電線１１とは、略直交している。 The first conductor element 12 is a conductor element that extends at a position separated from the ground substrate 3 by a predetermined distance substantially parallel to the ground surface 3a of the ground substrate 3. The end of the first conductor element 12 in the + X direction is electrically connected to the feeding point 2 by the feeding line 11. In FIG. 1, the first conductor element 12 and the feeder line 11 are substantially orthogonal to each other.
　第２導体素子１３は、第１導体素子１２の－Ｘ方向の端部とグランド基板３のグランド面３ａとを電気的に接続する導体素子である。第２導体素子１３は、第１導体素子１２およびグランド基板３と略直交する。第２導体素子１３は、＋Ｙ方向の端部が第１導体素子１２と電気的に接続し、－Ｙ方向の端部がグランド面３ａと電気的に接続する。以下、本明細書において、第２導体素子１３がグランド面３ａと接続する部分を、便宜上、グランド３１と称する。第２導体素子１３は、ばね接点であってもよい。 The second conductor element 13 is a conductor element that electrically connects the end portion of the first conductor element 12 in the −X direction and the ground surface 3a of the ground substrate 3. The second conductor element 13 is substantially orthogonal to the first conductor element 12 and the ground substrate 3. The end of the second conductor element 13 in the + Y direction is electrically connected to the first conductor element 12, and the end in the −Y direction is electrically connected to the ground surface 3a. Hereinafter, in the present specification, the portion where the second conductor element 13 is connected to the ground surface 3a is referred to as a ground 31 for convenience. The second conductor element 13 may be a spring contact.
　第３導体素子１４は、第１導体素子１２の－Ｘ方向の端部から基板３のグランド面３ａに向けて延びる導体素子である。第３導体素子１４は、第１導体素子１２の－Ｘ方向の端部から－Ｘ方向に延びるに伴いグランド面３ａに漸近して、グランド面３ａと電気的に接続する。図１では、第３導体素子１４は円弧状に形成されているが、第３導体素子１４は円弧状に限定されるわけではない。第３導体素子１４は、－Ｘ方向に延びるに伴いグランド面３ａに漸近すればよく、例えば、直線であってもよい。すなわち、第３導体素子１４は、第１導体素子１２の－Ｘ方向の端部から、さらに－Ｘ方向にずれた位置でグランド面３ａと電気的に接続する。第３導体素子１４が、グランド面３ａに対して漸近するため、第３導体素子１４とグランド面３ａとの間の容量結合を強めることができる。以下、本明細書において、第３導体素子１４がグランド面３ａと接続する部分を、便宜上、グランド３２と称する。 The third conductor element 14 is a conductor element extending from the end portion of the first conductor element 12 in the −X direction toward the ground surface 3a of the substrate 3. The third conductor element 14 asymptotically approaches the ground surface 3a as it extends in the −X direction from the end portion of the first conductor element 12 in the −X direction, and is electrically connected to the ground surface 3a. In FIG. 1, the third conductor element 14 is formed in an arc shape, but the third conductor element 14 is not limited to the arc shape. The third conductor element 14 may be asymptotic to the ground surface 3a as it extends in the −X direction, and may be, for example, a straight line. That is, the third conductor element 14 is electrically connected to the ground surface 3a at a position further deviated in the −X direction from the end portion of the first conductor element 12 in the −X direction. Since the third conductor element 14 is asymptotic to the ground surface 3a, the capacitive coupling between the third conductor element 14 and the ground surface 3a can be strengthened. Hereinafter, in the present specification, the portion where the third conductor element 14 is connected to the ground surface 3a is referred to as a ground 32 for convenience.
　図２は、実施形態に係るアンテナ上で動作するループアンテナを模式的に示す図である。図２の点線で模式的に例示するように、実施形態に係るアンテナ１は、ループアンテナ１０１、１０２、１０３の３つのループアンテナを含む。 FIG. 2 is a diagram schematically showing a loop antenna operating on the antenna according to the embodiment. As schematically illustrated by the dotted line in FIG. 2, the antenna 1 according to the embodiment includes three loop antennas 101, 102, and 103.
　ループアンテナ１０１は、給電点２から給電線１１、第１導体素子１２、第２導体素子１３および第３導体素子１４を経てグランド３２までの長さが周波数ｆ１の波長λ１の１／２波長となるように設定されることで、周波数ｆ１用のループアンテナとして動作する。 The loop antenna 101, power supply line 11 from the feeding point 2, first conductor element 12, a length of up to ground 32 through the second conductive element 13 and the third conductive element 14 is a wavelength lambda 1 of the frequency f 1 1/2 by setting such a wavelength, it operates as a loop antenna for the frequency f 1.
　ループアンテナ１０２は、給電点２から給電線１１、第１導体素子１２および第２導体素子１３を経てグランド３１までの長さが周波数ｆ２の波長λ２の１／２波長となるように設定されることで、周波数ｆ２用のループアンテナとして動作する。 The loop antenna 102 is set so that the length from the feeding point 2 through the feeding line 11, the first conductor element 12, and the second conductor element 13 to the ground 31 is 1/2 wavelength of the wavelength λ 2 of the frequency f 2. by being, it operates as a loop antenna for the frequency f 2.
　ループアンテナ１０３は、第３導体素子１４、および第２導体素子１３の長さが、周波数ｆ３の波長λ３の１／２波長となるように設定されることで、周波数ｆ３用のループアンテナとして動作する。 Loop antenna 103, the length of the third conductive element 14, and the second conductive element 13, that is set to be 1/2 wavelength of the wavelength lambda 3 of the frequency f 3, a loop for the frequency f 3 Operates as an antenna.
　図２を参照すると理解できるように、ループアンテナ１０１、１０２、１０３のアンテナ長が（ループアンテナ１０１のアンテナ長）＞（ループアンテナ１０２のアンテナ長）＞（ループアンテナ１０３のアンテナ長）となることから、（周波数ｆ３）＞（周波数ｆ２）＞（周波数ｆ１）となる。このように、アンテナ１は、周波数ｆ１、ｆ２、ｆ３の３つの周波数に対して共振可能であるとともに、アンテナ１全体のアンテナ長を周波数ｆ１の１／２波長に抑えられる。 As can be understood by referring to FIG. 2, the antenna lengths of the loop antennas 101, 102, and 103 are (antenna length of the loop antenna 101)> (antenna length of the loop antenna 102)> (antenna length of the loop antenna 103). Therefore, (frequency f 3 )> (frequency f 2 )> (frequency f 1 ). In this way, the antenna 1 can resonate with respect to the three frequencies f 1 , f 2 , and f 3 , and the antenna length of the entire antenna 1 can be suppressed to 1/2 wavelength of the frequency f 1.
　＜第１変形例＞
　図３は、第１変形例に係るアンテナを例示する図である。図３に例示されるアンテナ１ａは、第２導体素子１３とグランド３１との間にキャパシタ４１が設けられ、第３導体素子１４とグランド３２との間にインダクタ４２が設けられる。 <First modification>
FIG. 3 is a diagram illustrating an antenna according to the first modification. In the antenna 1a illustrated in FIG. 3, a capacitor 41 is provided between the second conductor element 13 and the ground 31, and an inductor 42 is provided between the third conductor element 14 and the ground 32.
　キャパシタ４１は、例えば、短縮コンデンサである。キャパシタ４１の静電容量を適宜設定することで、例えば、ループアンテナ１０２、１０３の電気的なアンテナ長を短縮することができる。すなわち、キャパシタ４１を第２導体素子１３とグランド３１との間に設けることで、ループアンテナ１０２が共振する周波数を周波数ｆ２よりも高くし、ループアンテナ１０３が共振する周波数を周波数ｆ３よりも高くすることができる。 The capacitor 41 is, for example, a shortening capacitor. By appropriately setting the capacitance of the capacitor 41, for example, the electrical antenna lengths of the loop antennas 102 and 103 can be shortened. That is, by providing the capacitor 41 between the second conductor element 13 and the ground 31, the frequency of the loop antenna 102 is resonant and higher than the frequency f 2, than the frequency f 3 the frequency loop antenna 103 resonates Can be high.
　インダクタ４２は、例えば、延長コイルである。インダクタ４２のインダクタンスを適宜設定することで、例えば、ループアンテナ１０１、１０３の電気的なアンテナ長を長くすることができる。すなわち、インダクタ４２を第３導体素子１４とグランド３２との間に設けることで、ループアンテナ１０１が共振する周波数を周波数ｆ１よりも低くし、ループアンテナ１０３が共振する周波数を周波数ｆ３よりも低くすることができる。 The inductor 42 is, for example, an extension coil. By appropriately setting the inductance of the inductor 42, for example, the electrical antenna lengths of the loop antennas 101 and 103 can be lengthened. That is, the inductor 42 that provided between the third conductive element 14 and the ground 32, the frequency of the loop antenna 101 is resonant and lower than the frequency f 1, than the frequency f 3 the frequency loop antenna 103 resonates Can be lowered.
　第１変形例によれば、キャパシタ４１およびインダクタ４２によって、実際のアンテナ長を変更しなくとも電気的なアンテナ長を変更することができ、ひいては、ループアンテナ１０１、１０２、１０３が共振する周波数を変更することができる。 According to the first modification, the capacitor 41 and the inductor 42 can change the electrical antenna length without changing the actual antenna length, and thus the frequency at which the loop antennas 101, 102, and 103 resonate. Can be changed.
　＜第２変形例＞
　図４は、第２変形例に係るアンテナを例示する図である。図４に例示されるアンテナ１ｂは、第２導体素子１３とグランド端子３１との間に並列共振回路５１が設けられ、第３導体素子１４とグランド端子３２との間に並列共振回路５２が設けられる。 <Second modification>
FIG. 4 is a diagram illustrating an antenna according to the second modification. In the antenna 1b illustrated in FIG. 4, a parallel resonance circuit 51 is provided between the second conductor element 13 and the ground terminal 31, and a parallel resonance circuit 52 is provided between the third conductor element 14 and the ground terminal 32. Be done.
　並列共振回路５１、５２は、インダクタとキャパシタとを並列に接続した回路である。並列共振回路５１、５２の共振周波数は、インダクタのインダクタンスとキャパシタの静電容量とに基づいて適宜設定可能である。アンテナ１ｂでは、並列共振回路５１、５２の共振周波数を適宜設定することで、アンテナ１ｃを複数のモノポールアンテナとして動作させることができる。 The parallel resonant circuits 51 and 52 are circuits in which an inductor and a capacitor are connected in parallel. The resonance frequencies of the parallel resonant circuits 51 and 52 can be appropriately set based on the inductance of the inductor and the capacitance of the capacitor. In the antenna 1b, the antenna 1c can be operated as a plurality of monopole antennas by appropriately setting the resonance frequencies of the parallel resonance circuits 51 and 52.
　図５から図８は、第２変形例に係るアンテナ上で動作するモノポールアンテナを模式的に示す図である。図５にはモノポールアンテナ１０１ｂが例示され、図６にはモノポールアンテナ１０２ｂが例示され、図７にはモノポールアンテナ１０３ｂが例示され、図８にはモノポールアンテナ１０４ｂが例示される。 5 to 8 are diagrams schematically showing a monopole antenna operating on the antenna according to the second modification. FIG. 5 illustrates a monopole antenna 101b, FIG. 6 illustrates a monopole antenna 102b, FIG. 7 illustrates a monopole antenna 103b, and FIG. 8 illustrates a monopole antenna 104b.
　図５の点線に例示されるように、モノポールアンテナ１０１ｂは、給電線１１、第１導体素子１２、第３導体素子１４、並列共振回路５２およびグランド端子３１によって形成され、周波数ｆ１１に共振するモノポールアンテナである。図６の点線に例示されるように、モノポールアンテナ１０２ｂは、給電線１１、第１導体素子１２および第３導体素子１４によって形成され、周波数ｆ１２に共振するモノポールアンテナである。図７の点線に例示されるように、モノポールアンテナ１０３ｂは、給電線１１、第１導体素子１２および第２導体素子１３によって形成され、周波数ｆ１３に共振するモノポールアンテナである。図８の点線に例示されるように、モノポールアンテナ１０４ｂは、第２導体素子１３および第３導体素子１４によって形成され、周波数ｆ１４に共振するモノポールアンテナである。 As illustrated in dotted line in FIG. 5, the monopole antenna 101b is the feed line 11, the first conductive element 12, the third conductive element 14, formed by the parallel resonant circuit 52 and the ground terminal 31, the resonance frequency f 11 It is a monopole antenna. As illustrated in dotted line in FIG. 6, the monopole antenna 102b may feed line 11, formed by the first conductive element 12 and the third conductive element 14, a monopole antenna which resonates with the frequency f 12. As illustrated by the dotted line in FIG. 7, the monopole antenna 103b is a monopole antenna formed by the feeder line 11, the first conductor element 12, and the second conductor element 13 and resonating with the frequency f13. As illustrated by the dotted line in FIG. 8, the monopole antenna 104b is a monopole antenna formed by the second conductor element 13 and the third conductor element 14 and resonating at the frequency f14.
　図５から図８を比較すると理解できるように、モノポールアンテナ１０１ｂ、１０２ｂ、１０３ｂ、１０４ｂのアンテナ長は、（モノポールアンテナ１０１ｂのアンテナ長）＞（モノポールアンテナ１０２ｂのアンテナ長）＞（モノポールアンテナ１０３ｂのアンテナ長）＞（モノポールアンテナ１０４ｂのアンテナ長）となる。その結果、モノポールアンテナ１０１ｂ、１０２ｂ、１０３ｂ、１０４ｂが共振する周波数は、（周波数ｆ１４）＞（周波数ｆ１３）＞（周波数ｆ１２）＞（周波数ｆ１１）となる。すなわち、アンテナ１ｂは、互いに異なる４つの周波数（周波数ｆ１１、周波数ｆ１２、周波数ｆ１３および周波数ｆ１４）に共振することができる。 As can be understood by comparing FIGS. 5 to 8, the antenna lengths of the monopole antennas 101b, 102b, 103b, and 104b are (antenna length of the monopole antenna 101b)> (antenna length of the monopole antenna 102b)> (mono). (Antenna length of pole antenna 103b)> (antenna length of monopole antenna 104b). As a result, the frequencies at which the monopole antennas 101b, 102b, 103b, and 104b resonate are (frequency f 14 )> (frequency f 13 )> (frequency f 12 )> (frequency f 11 ). That is, the antenna 1b can resonate at four different frequencies (frequency f 11 , frequency f 12 , frequency f 13 and frequency f 14).
　＜第３変形例＞
　図９は、第３変形例に係るアンテナを例示する図である。図９に例示されるアンテナ１ｃは、第１導体素子１２の－Ｘ側の端部から＋Ｘ側の端部の間の分岐点１２ａとグランド面３ａとが、第４導体素子１３ａによって電気的に接続される点で、実施形態に係るアンテナ１とは異なる。以下、本明細書において、便宜上、第４導体素子１３ａとグランド面３ａとが接続する部分をグランド３３と称する。 <Third modification example>
FIG. 9 is a diagram illustrating an antenna according to the third modification. In the antenna 1c illustrated in FIG. 9, the branch point 12a and the ground surface 3a between the −X side end portion and the + X side end portion of the first conductor element 12 are electrically formed by the fourth conductor element 13a. It differs from the antenna 1 according to the embodiment in that it is connected. Hereinafter, in the present specification, for convenience, the portion where the fourth conductor element 13a and the ground surface 3a are connected is referred to as a ground 33.
　図１０は、第３変形例に係るアンテナ上で動作するループアンテナを模式的に示す図である。図１０を参照すると理解できるように、第３変形例に係るアンテナ１ｃでは、ループアンテナ１０１、１０２、１０３に加えて、ループアンテナ３０１、３０２を有する。ループアンテナ３０１は、給電点２から給電線１１、第１導体素子１２、分岐点１２ａ、第４導体素子１３ａを経てグランド３３に至る経路によって形成される半波長ループアンテナである。また、ループアンテナ３０２は、グランド３３から分岐点１２ａ、第１導体素子、第２導体素子１３を経てグランド３１に至る経路によって形成される半波長ループアンテナである。分岐点１２ａの位置を適宜決定することで、ループアンテナ３０１、３０２のアンテナ長を設定することができ、ひいては、ループアンテナ３０１、３０２を共振させる電波の周波数を設定することができる。 FIG. 10 is a diagram schematically showing a loop antenna operating on the antenna according to the third modification. As can be understood with reference to FIG. 10, the antenna 1c according to the third modification has loop antennas 301 and 302 in addition to the loop antennas 101, 102 and 103. The loop antenna 301 is a half-wavelength loop antenna formed by a path from the feed point 2 to the ground 33 via the feed line 11, the first conductor element 12, the branch point 12a, and the fourth conductor element 13a. Further, the loop antenna 302 is a half-wavelength loop antenna formed by a path from the ground 33 to the ground 31 via the branch point 12a, the first conductor element, and the second conductor element 13. By appropriately determining the position of the branch point 12a, the antenna lengths of the loop antennas 301 and 302 can be set, and by extension, the frequency of the radio wave that resonates the loop antennas 301 and 302 can be set.
　なお、図９、図１０では、第１導体素子１２の－Ｘ側の端部から＋Ｘ側の端部の間に設けた一か所の分岐点１２ａから第４導体素子１３ａによってグランド面３ａと電気的に接続したが、分岐点を複数設け、複数設けた分岐点のそれぞれとグランド面３ａとを導体素子によって電気的に接続してもよい。このような設計を採用することで、アンテナ１ｃ上で動作するループアンテナをさらに増加させることができる。 In FIGS. 9 and 10, the ground surface 3a is formed from one branch point 12a provided between the −X side end portion and the + X side end portion of the first conductor element 12 by the fourth conductor element 13a. Although it is electrically connected, a plurality of branch points may be provided, and each of the plurality of branch points and the ground surface 3a may be electrically connected by a conductor element. By adopting such a design, the number of loop antennas operating on the antenna 1c can be further increased.
　＜第４変形例＞
　図１１は、第３変形例に係るアンテナを例示する図である。図１１に例示されるアンテナ１ｄは、第３導体素子１４が第３導体素子１４ａとなっている点で、実施形態に係るアンテナ１とは異なる。 <Fourth modification>
FIG. 11 is a diagram illustrating an antenna according to the third modification. The antenna 1d illustrated in FIG. 11 is different from the antenna 1 according to the embodiment in that the third conductor element 14 is the third conductor element 14a.
　第３導体素子１４ａは、グランド基板３の側面にまで達し、その後屈曲してグランド基板３の側面に設けられたグランド面３ｂと電気的に接続する点で第３導体素子１４とは異なる。以下、本明細書において、便宜上、第３導体素子１４ａがグランド基板３の側面に設けられたグランド面３ｂと接続する部分をグランド３２ａと称する。 The third conductor element 14a differs from the third conductor element 14 in that it reaches the side surface of the ground substrate 3 and then bends to electrically connect to the ground surface 3b provided on the side surface of the ground substrate 3. Hereinafter, in the present specification, for convenience, the portion where the third conductor element 14a is connected to the ground surface 3b provided on the side surface of the ground substrate 3 is referred to as a ground 32a.
　＜適用例＞
　図１２は、第３変形例に係るアンテナをスマートフォンに適用した例を示す図である。図１２では、スマートフォン５００のディスプレイ側のケースを開いた状態を例示している。 <Application example>
FIG. 12 is a diagram showing an example in which the antenna according to the third modification is applied to a smartphone. FIG. 12 illustrates a state in which the case on the display side of the smartphone 500 is opened.
　スマートフォン５００は、プロセッサやメモリ等を備える可搬型の情報処理装置である。スマートフォン５００は、アンテナ１ｄを用いて外部装置と無線通信を行う。スマートフォン５００では、その側面（周囲）を枠状の金属フレーム５１が囲んでいる。金属フレーム５１は、スマートフォン５００の側面を覆う外装である。金属フレーム５１の角は、丸い円弧状に形成されている。金属フレーム５１が区画する領域には、グランド基板３が収容される。スマートフォン５００では、上側（＋Ｙ側）に電話での通話に用いられるスピーカーが設けられ、下側（－Ｙ側）に電話での通話に用いられるマイクが設けられる。 The smartphone 500 is a portable information processing device equipped with a processor, memory, and the like. The smartphone 500 wirelessly communicates with an external device using the antenna 1d. In the smartphone 500, a frame-shaped metal frame 51 surrounds the side surface (periphery) thereof. The metal frame 51 is an exterior covering the side surface of the smartphone 500. The corners of the metal frame 51 are formed in a round arc shape. The ground substrate 3 is housed in the area defined by the metal frame 51. In the smartphone 500, a speaker used for telephone calls is provided on the upper side (+ Y side), and a microphone used for telephone calls is provided on the lower side (-Y side).
　スマートフォン５００では、金属フレーム５１の一部をアンテナ１ｄとして利用する。図１２では、アンテナ１ｄは、スマートフォン５００の上側に設けられている。図１２に例示するように、金属フレーム５１のうち、アンテナ１ｄとして利用する領域と他の領域との間には、スリット５１１、５１２が設けられる。第１導体素子５１１は、金属フレーム５１のうちアンテナ１ｄとして利用しない領域からスリット５１１によって電気的に分離される。第３導体素子１４ａは、金属フレーム５１のうちアンテナ１ｄとして利用しない領域からスリット５１２によって電気的に分離される。 In the smartphone 500, a part of the metal frame 51 is used as the antenna 1d. In FIG. 12, the antenna 1d is provided on the upper side of the smartphone 500. As illustrated in FIG. 12, slits 511 and 512 are provided between the region of the metal frame 51 used as the antenna 1d and another region. The first conductor element 511 is electrically separated from the region of the metal frame 51 that is not used as the antenna 1d by the slit 511. The third conductor element 14a is electrically separated from the region of the metal frame 51 that is not used as the antenna 1d by the slit 512.
　スマートフォン５００では、第３導体素子１４ａとして、金属フレーム５１において円弧上に形成された角の部分を使用する。このように、金属フレーム５１をアンテナ１ｄの導体素子としても用いることで、金属フレーム５１が区画する領域内においてアンテナ１ｄが占める領域を減少させることができる。 In the smartphone 500, the corner portion formed on the arc in the metal frame 51 is used as the third conductor element 14a. In this way, by using the metal frame 51 as the conductor element of the antenna 1d, it is possible to reduce the area occupied by the antenna 1d in the area defined by the metal frame 51.
　以上で開示した実施形態や変形例はそれぞれ組み合わせることができる。例えば、図１２では、第３変形例に係るアンテナ１ｄをスマートフォン５００に適用したが、アンテナ１、１ａ、１ｂ、１ｃのいずれのアンテナをスマートフォン５００に適用してもよい。また、アンテナ１、１ａ、１ｂ、１ｃ、１ｄのいずれかを車載用アンテナとして用いてもよい。 The embodiments and modifications disclosed above can be combined with each other. For example, in FIG. 12, the antenna 1d according to the third modification is applied to the smartphone 500, but any of the antennas 1, 1a, 1b, and 1c may be applied to the smartphone 500. Further, any one of the antennas 1, 1a, 1b, 1c and 1d may be used as an in-vehicle antenna.
　１、１ａ、１ｂ、１ｃ・・・アンテナ
　２・・・給電点
　１１・・・給電線
　１２・・・第１導体素子
　１３・・・第２導体素子
　１４・・・第３導体素子
　３・・・グランド基板
　３ａ、３ｂ・・・グランド面
　３１、３２、３２ａ、３３、・・・グランド
　４１・・・キャパシタ
　４２・・・インダクタ
　５１、５２・・・並列共振回路
　１０１、１０２、１０３、３０１、３０２・・・ループアンテナ
　１０１ｂ、１０２ｂ、１０３ｂ、１０４ｂ・・・モノポールアンテナ
　５００・・・スマートフォン 1, 1a, 1b, 1c ... Antenna 2 ... Feeding point 11 ... Feeding line 12 ... 1st conductor element 13 ... 2nd conductor element 14 ... 3rd conductor element 3 ... -Ground substrate 3a, 3b ... Ground surface 31, 32, 32a, 33, ... Ground 41 ... Capacitor 42 ... Inverter 51, 52 ... Parallel resonance circuit 101, 102, 103, 301, 302 ... Loop antenna 101b, 102b, 103b, 104b ... Monopole antenna 500 ... Smartphone

Claims (7)

  1. 　グランド基板と、
    　前記グランド基板に設けられる給電点と、
    　一方の端部が前記給電点と電気的に接続し、他方の端部が前記グランド基板と電気的に接続する前記グランド基板に対して平行な第１導体素子と、
    　前記第１導体素子の前記他方の端部から、さらに前記他方に向けて延びるとともに徐々に前記グランド基板に漸近して前記グランド基板と電気的に接続する第２導体素子と、を備える、
    　アンテナ装置。     With the ground board
    A feeding point provided on the ground board and
    A first conductor element parallel to the ground substrate, one end of which is electrically connected to the feeding point and the other end of which is electrically connected to the ground substrate.
    A second conductor element that extends from the other end of the first conductor element toward the other and gradually approaches the ground substrate and is electrically connected to the ground substrate.
    Antenna device.
  2. 　前記第１導体素子は、さらに、前記一方の端部から前記他方の端部の間の一か所以上の箇所において、前記グランド基板と電気的に接続される、
    　請求項１に記載のアンテナ装置。     The first conductor element is further electrically connected to the ground substrate at one or more locations between the one end and the other end.
    The antenna device according to claim 1.
  3. 　前記第１導体素子と前記グランド基板との間の電気的な経路上および前記第２導体素子と前記グランド基板との間の電気的な経路上の少なくとも一方に、キャパシタまたはインダクタが設けられる、
    　請求項１または２に記載のアンテナ装置。     Capacitors or inductors are provided on at least one of the electrical paths between the first conductor element and the ground substrate and on the electrical path between the second conductor element and the ground substrate.
    The antenna device according to claim 1 or 2.
  4. 　前記第１導体素子と前記グランド基板との間の電気的な経路上および前記第２導体素子と前記グランド基板との間の電気的な経路上の少なくとも一方に、キャパシタおよびインダクタを含む並列共振回路が設けられる、
    　請求項１から３のいずれか一項に記載のアンテナ装置。     A parallel resonant circuit including a capacitor and an inductor on at least one of the electrical path between the first conductor element and the ground substrate and the electrical path between the second conductor element and the ground substrate. Is provided,
    The antenna device according to any one of claims 1 to 3.
  5. 　前記第１導体素子と前記グランド基板との間は、ばね接点によって電気的に接続される、
    　請求項１から４のいずれか一項に記載のアンテナ装置。     The first conductor element and the ground substrate are electrically connected by a spring contact.
    The antenna device according to any one of claims 1 to 4.
  6. 　前記アンテナ装置は、携帯端末装置に実装され、
    　前記第１導体素子の少なくとも一部は、前記携帯端末装置の外装である金属フレームによって形成される、
    　請求項１から５のいずれか一項に記載のアンテナ装置。     The antenna device is mounted on a mobile terminal device and is mounted on a mobile terminal device.
    At least a part of the first conductor element is formed by a metal frame which is an exterior of the mobile terminal device.
    The antenna device according to any one of claims 1 to 5.
  7. 　請求項１から６のいずれか一項に記載のアンテナ装置を実装した、
    　無線通信装置。     The antenna device according to any one of claims 1 to 6 is mounted.
    Wireless communication device.
PCT/JP2019/040510 2019-10-15 2019-10-15 Antenna device and wireless communication apparatus WO2021074972A1 (en)

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JP2014135770A (en) * 2010-07-06 2014-07-24 Apple Inc Adjustable antenna systems
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