JP2004096314A - Dielectric antenna and mobile communication apparatus with built-in the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dielectric antenna which can remove a decrease in a radio wave radiation efficiency and a disturbance of band broadening as fast as possible by suppressing a mutual interference between elements of small sizes. <P>SOLUTION: The dielectric antenna includes a first linear element which can resonate with a first resonance frequency, a power supply terminal connected to a base end of the first element, a linear conductor for branching from the vicinity of the base end of the element on the antennal forming surface, a ground terminal connected to a distal end of the conductor, and a second linear element which can resonate with a second resonance frequency different from the first resonance frequency. The first linear element is formed along an outer periphery of the antenna forming surface, the second linear element is formed by using an area surrounded by the first element, and hence a mutual interference can be suppressed as much as possible without disposing adjacently the elements. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dielectric antenna built in a mobile communication device represented by a mobile phone, a portable wireless communication device, and the like, and a mobile communication device having a derivative antenna built therein.
[0002]
[Prior art]
2. Description of the Related Art With the spread of mobile communication devices in recent years, there has been a demand for a reduction in size and weight so as to be convenient when carrying or moving. Among electronic component groups built into such mobile communication devices, miniaturization of semiconductor integrated circuits and the like is rapidly progressing.
[0003]
[Problems to be solved by the invention]
However, the miniaturization of the antenna has not progressed, and this has hindered the reduction in size and weight of the mobile communication device. Japanese Patent Application Laid-Open No. 2000-196339 discloses a spiral or meandering element for downsizing an antenna. However, when a spiral or meandering element is formed on a limited antenna formation surface, the elements are adjacent to each other, and thus mutual interference may occur due to capacitive coupling between the two elements. Mutual interference between the two elements should be avoided as much as possible, because it reduces the radiation efficiency of radio waves and hinders a wide band. The problem to be solved by the present invention is to solve the above-mentioned problem. By suppressing mutual interference between elements while being small, it is possible to reduce the radiation efficiency of radio waves and hinder broadband. It is an object of the present invention to provide a dielectric antenna which can be eliminated, and a mobile communication device incorporating such an antenna.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention has the following configuration. It should be noted that the definition of terms used in the description of the invention according to any one of the claims applies to the invention according to the other claims within the scope of its nature.
[0005]
(Characteristics of the invention described in claim 1)
The dielectric antenna according to the first aspect of the present invention includes a laminated dielectric having a rectangular antenna forming surface and an outer peripheral end surface, a first dielectric extending on the antenna forming surface adjacent to an outer periphery of the antenna forming surface, and A first linear element capable of resonating at a resonance frequency, a power supply terminal connected to the linear element base end, a linear conductor branching from the vicinity of the linear element base end on the antenna forming surface, A ground terminal connected to the end of the linear conductor; a ground terminal that branches off from the middle of the first linear element and terminates in the middle of the linear conductor and resonates at a second resonance frequency different from the first resonance frequency; A possible second linear element.
[0006]
The dielectric antenna according to the first aspect is a so-called inverted-F antenna. Since the first linear element extends adjacent to the outer periphery of the rectangular antenna forming surface, a blank area on the antenna forming surface can be effectively used. In the dielectric antenna according to the first aspect, a loop-shaped second linear element is formed by effectively utilizing the blank area. That is, although the second linear element is loop-shaped and requires a corresponding occupied area, the second linear element can be formed using the blank area, and the formed second linear element and the first linear element can be formed. And are not adjacent. For this reason, mutual interference, which is likely to occur when adjacent to each other, is suppressed, and a decrease in the radiation efficiency of the antenna and a hindrance to a wider band are eliminated as much as possible. The loop-shaped second linear element requires a corresponding occupied area as described above. However, since the element has a larger electrical volume than a quarter-wavelength element, for example, the second linear element has a larger area. , The band of the resonance frequency becomes large.
[0007]
(Characteristics of the invention described in claim 2)
A dielectric antenna according to a second aspect of the present invention is the dielectric antenna according to the first aspect, wherein the second linear element is formed to have the same length as the wavelength of the second resonance frequency. It is characterized by.
[0008]
According to the dielectric antenna of the second aspect, in addition to the function and effect of the dielectric antenna of the first aspect, since the second linear element is formed to have the same length as the wavelength of the second resonance frequency, the second linear element has one wavelength. Functions as a loop.
[0009]
(Characteristics of the invention described in claim 3)
A dielectric antenna according to a third aspect of the present invention is the dielectric antenna according to the first aspect, wherein a plurality of the antenna forming surfaces are provided, and the first linear shape is provided on one of the antenna forming surfaces. An element is formed, the second linear element is formed on the other surface of the antenna forming surface, and the second linear element is a branch point with the first linear element and / or A capacitor structure is provided between the linear conductor and an end point. The “capacitor structure” includes both a capacitor that is an electronic component and a structure that substantially functions as a capacitor.
[0010]
According to the dielectric antenna of the third aspect, in addition to the function and effect of the dielectric antenna of the first aspect, the branch point of the second linear element and the first linear element and the terminal point of the strip conductor are connected via the capacitor structure. Combined. Alternatively, only one of the branch point and the end point is connected via the capacitor structure, and the other is directly connected.
[0011]
(Characteristics of the invention described in claim 4)
A dielectric antenna according to a fourth aspect of the present invention is the dielectric antenna according to the first or second aspect, wherein a plurality of the antenna forming surfaces are provided, and the first antenna forming surface is provided on one of the antenna forming surfaces. A linear element is formed, the second linear element is formed on the other surface of the antenna forming surface, and a branch point of the first linear element and an end point of the linear conductor Are provided, and a part or all of the connecting conductor is disposed on the outer peripheral end surface of the laminated dielectric.
[0012]
According to the dielectric antenna of the fourth aspect, in the dielectric antenna of the first or second aspect, the second antenna forming surface corresponds to a part or all of the connecting conductor disposed on the outer peripheral end surface of the laminated dielectric. The length of the second linear element above can be reduced. By making the length shorter, interference between elements is suppressed accordingly.
[0013]
(Characteristics of the invention described in claim 5)
A dielectric antenna according to a fifth aspect of the present invention is the dielectric antenna according to any one of the first to fourth aspects, wherein the first linear element includes a first bent portion located in order from the base end. A second bent portion and a third bent portion, between the base portion and the first bent portion, between the first portion of the linear element and the second bent portion and the distal end; A second portion of the linear element positioned facing the antenna forming surface at a maximum distance from the antenna forming surface, and the linear element positioned between the first bent portion and the second bent portion; And a fourth portion of the linear element located between the third bent portion and the tip end is opposed to the antenna forming surface at a maximum distance. . Therefore, the first portion and the second portion face each other, and similarly, the third portion and the fourth portion face each other.
[0014]
According to the dielectric antenna of the fifth aspect, in addition to the effect of the dielectric antenna according to any one of the first to fourth aspects, the degree of interference between opposing portions caused by bending of the linear element is minimized. Can be reduced. That is, the first part and the second part, and the third part and the fourth part also face each other on the antenna forming surface, and are set so that the distance between them at that time is as long as possible. Therefore, mutual interference between the opposing first and second portions and between the third and fourth portions can be most effectively eliminated on the antenna forming surface.
[0015]
(Characteristics of the invention described in claim 6)
A mobile communication device according to a sixth aspect of the invention includes the dielectric antenna according to any one of the first to fifth aspects. Examples of the mobile communication device include a mobile phone and a small computer having a communication function.
[0016]
According to the mobile communication device of the sixth aspect, the dielectric antenna according to any one of the first to fifth aspects is built in, and as described above, these dielectric antennas can be downsized as compared with the conventional one. It is planned. For this reason, the mobile communication device having such a built-in dielectric antenna can be reduced in size due to the reduced size of the dielectric antenna, or it is possible to provide a margin inside the mobile communication device even with the same size.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of the dielectric antenna according to the first embodiment. FIG. 2 is a perspective view showing the structure of the laminated dielectric shown in FIG. FIG. 3 is a plan view in a state where the upper substrate of the dielectric antenna shown in FIG. 2 is omitted. FIG. 4 is a chart showing characteristics of the dielectric antenna shown in FIG. FIG. 5 is a perspective view illustrating the structure of the dielectric antenna according to the second embodiment. FIG. 6 is a plan view in a state where the upper substrate of the dielectric antenna shown in FIG. 5 is omitted. FIG. 7 is a perspective view of the dielectric antenna according to the third embodiment. FIG. 8 is a front view of a small computer including a dielectric antenna.
[0018]
(Structure of the first embodiment)
The dielectric antenna according to the first embodiment will be described with reference to FIGS. The dielectric antenna 1 includes a rectangular parallelepiped laminated dielectric 7 in which an insulating upper substrate 3 and a lower substrate 5 made of a dielectric ceramic material are laminated. The upper substrate 3 and the lower substrate 5 may each be a single-layer body or a laminate. Since the upper substrate 3 and the lower substrate 5 are both formed in a rectangle (rectangle) of the same size when viewed in a plan view, the laminated dielectric 7 formed by laminating both has a rectangular parallelepiped shape. The upper surface of the lower substrate 5 (the surface facing the upper substrate 3) is an antenna forming surface 9 for forming a first linear element and the like described later. The upper substrate 3 is not for forming an antenna, but is a dielectric layer whose main purpose is to protect the first linear element and the like formed on the antenna forming surface 9. The laminated dielectric 7 has a two-layer structure, but may have a single-layer structure by omitting the upper substrate 3. Further, another layer substrate may be further laminated to form a structure of three or four or more layers. The reason why the laminated dielectric 7 is formed in the shape of a rectangular parallelepiped is to make it easy to form a large number of pieces by a so-called dicer cut or the like.
[0019]
(Configuration of the first linear element)
As shown in FIGS. 2 and 3, on the antenna forming surface 9, a first linear element 11 adjacent to (along) the outer periphery (9a, 9b, 9c, 9d) of the antenna forming surface 9 is formed. . The first linear element 11 is conveniently formed by printing a conductive paste, and a margin is left between the outer circumferences 9a, 9b, 9c, and 9d in order to absorb a printing shift at that time. Preferably. On the other hand, if there is no problem even if a slight printing shift occurs, or if the printing itself is unnecessary, there is no need to leave it.
[0020]
As shown in FIGS. 2 and 3, the first linear element 11 includes a first portion 13, a third portion 14, a second portion 15, and a fourth portion 16. Here, the reason why the numbers are not arranged in order is that for convenience of explanation, and the fact that the numbers are not arranged does not affect the shape of the first linear element 11. The first portion 13 of the first linear element 11 is a portion located between the base end portion 12 and the first bent portion k1, and the third portion 14 is similarly formed by the first bent portion k1, the second bent portion k2, It is a part located between. Further, the second portion 15 is a portion located between the second bent portion k2 and the third bent portion k3, and the fourth portion 16 is similarly located between the third bent portion k3 and the open end 17. Part. In other words, the first portion 13 is adjacent to the outer periphery 9a, the third portion 14 is adjacent to the outer periphery 9b, the second portion 15 is adjacent to the outer periphery 9c, and the fourth portion 16 is adjacent to the outer periphery 9d. In addition, since each of the bent portions k1, k2, and k3 is located at each corner of the antenna forming surface 9, the first linear element 11 has its outer periphery 9a, 9b, It extends in an outer winding shape along 9c and 9d. The base end 12 of the first linear element 11 is connected to a power supply terminal 19 formed on the end face of the laminated dielectric 7, as shown in FIGS. The power supply terminal 19 is generally formed by applying a conductive paste to the end face of the laminated dielectric 7.
[0021]
As described above, even when the first linear element 11 is formed on the antenna forming surface having the same area, the first linear element 11 is formed on the outer surface of the antenna. This is because the circuit element is detoured as compared with a single linear element, and the length can be increased by the detour. The longer the length of the first linear element is, the lower the resonance frequency is, and the smaller the antenna itself is. Furthermore, by forming the first linear element 11 in an outer winding shape, the distance between the opposing first portion 13 and the second portion 15 and the distance between the third portion 14 and the fourth portion 16 are respectively reduced. It becomes maximum on the second antenna formation surface 9. Since the distance is maximum, it is possible to effectively eliminate mutual interference between the first portion 13 and the second portion 15 and the third portion 14 and the fourth portion 16 on the same second antenna forming surface 9. It becomes possible.
[0022]
(Structure of linear conductor)
The linear conductor will be described with reference to FIGS. The linear conductor 25 provided on the antenna forming surface 9 is a conductor for achieving impedance matching at the feed terminal 19 which is a feed point. The linear conductor 25 branches on the antenna forming surface 9 from a branch point 23 in the vicinity of the first linear element base end portion 12, and the distal end thereof is connected to a ground terminal 21 provided on the end surface of the laminated dielectric 7. Through a bent portion 27. The linear conductor 25 can be formed in a separate process from the first linear element 11, but it is better to print and form the first linear element 11 and a second linear element 31 described later using a conductive paste at the same time. It is convenient. The feed point impedance can be adjusted by shifting the position of the branch point in the length direction of the first linear element 11. Furthermore, since the linear conductor 25 is also a part that contributes to the resonance of the first linear element 11, the resonance frequency of the first linear element 11 can be adjusted by adjusting its length. On the other hand, since the linear conductor 25 does not contribute to radiation of radio waves, there is little possibility that mutual interference will occur even if the linear conductor 25 is adjacent to the first linear element 11. Further, since there is no possibility of mutual interference, it is possible to lengthen the length of the linear conductor 25 on the same antenna forming surface 9 by bending or meandering a part thereof. It is convenient to form the ground terminal 21 by applying a conductive paste to the end of the laminated dielectric 7 as in the case of the power supply terminal 19.
[0023]
(Configuration of second linear element)
Reference numeral 31 shown in FIGS. 1 to 3 indicates a second linear element formed on the antenna forming surface 9. The second linear element 31 has a first outward path portion 34, a second outward path section 35, a folded portion 36, and a backward path portion 37 bent portion 38, and branches from a branch point 33 in the middle of the first linear element 11. Then, it is formed in a loop shape until it reaches the end point 39 in the middle of the linear conductor 25. The first outward path portion 34 extends obliquely to the upper right direction in FIG. 3 with respect to the first portion 13 of the first linear element 11. This is because the first outward path portion 34 is formed with the main purpose of arranging the three members of the second outward path portion 35, the folded portion 36, and the return route portion 37 in a substantially central area of the antenna forming surface 9. It is. Since the position of the branch point 33 is deeply involved in the impedance of the second linear element 31 at that position, the first forward path portion 34 is required to simultaneously satisfy the proper setting of the impedance and the central area arrangement of the forward path portion 34 and the like. Was provided. Therefore, as a result of moving the branch point 33 in order to obtain an appropriate impedance, the first outward path 34 may extend in the horizontal direction or may be inclined downward toward the second outward path 35. Further, there may be a case where a branch point 33 should be provided in the third portion 14 of the first linear element 11. The position of the end point 39 determines the total length of the second linear element 31. The second linear element 31 in the present embodiment is set to have the same length as a wavelength of a second resonance frequency described later, that is, a one-wavelength loop. The one-wavelength loop is formed, for example, in order to make the electric volume larger than that of the quarter-wavelength element, and the resonance frequency can be made wider by increasing the electric volume. Although the bent portion 38 shown in FIG. 3 is bent substantially at a right angle, it does not prevent the bent portion 38 from being bent obliquely with the movement of the end point 39. Although the second outward path 35 and the backward path 37 shown in FIG. 3 are arranged substantially in parallel, they need not necessarily be parallel. Although the second linear element 31 is formed in a shape close to a square loop as a whole, it may be formed in a shape similar to a circular loop.
[0024]
Here, the high-frequency current supplied from the power supply portion P flows from the base end portion 12 of the first linear element 11 to the first bent portion k1, the second bent portion k2, the third bent portion k3, and the open end 17. Flow in order. On the other hand, the high-frequency current flowing through the second linear element 31 enters the second linear element 31 from the branch point 33 and passes through the first outward path section 34, the second outward path section 35, the folded section 36, and the backward path section 37, It flows from the end point 39 to the ground terminal 21 through the linear conductor 25 via the bent portion 38 in order.
[0025]
The relationship between the first frequency and the second frequency is determined according to the intended use of the dielectric antenna 1. That is, as shown in FIG. 4A, by bringing the resonance frequency F1 of the first linear element 11 and the resonance frequency F2 of the second linear element 31 close to each other, for example, a band F equal to or lower than VSWR2 can be obtained. When the second linear element 31 is provided, the frequency band of the dielectric antenna 1 as a whole can be made wider than that in the case where the second linear element 31 is not provided. Further, as shown in FIG. 4B, the dielectric antenna 1 resonates at two frequencies by separating the first resonance frequency F1 and the second resonance frequency F2 appropriately, that is, a dual band is formed. be able to. According to an experiment conducted by the inventor, when the first resonance frequency F1 in the former case is set to, for example, 1.98 GHz, the second resonance frequency is set to 2.10 GHz, so that the band equal to or lower than VSWR2 is set to one. A wide band such as 0.92 to 2.17 GHz could be obtained. Similarly, in the latter case, a dual band is realized in which 2.45 GHz used for wireless communication such as a notebook computer or a LAN card is used as the first resonance frequency F1, and 5.25 GHz is used as the second resonance frequency F2. I was able to.
[0026]
Note that a dummy electrode (not shown) for securely soldering the dielectric antenna 1 to a parent substrate (not shown) is provided on the back surface of the lower substrate 5 (the surface on the back side of the paper of FIG. 3). is there. When mounted on a parent board (not shown), the power supply terminal 19 is connected to the power supply section P of the parent board, and the ground terminal 21 is connected to the ground section G by soldering.
[0027]
(Structure of the second embodiment)
The second embodiment will be described with reference to FIGS. The second embodiment differs greatly from the first embodiment in that the first linear element and the second linear element are formed on the same antenna forming surface in the first embodiment, whereas the second linear element is formed on the same antenna forming surface. In the embodiment, it is formed on a different antenna formation surface. Hereinafter, only this different point will be described, and the description of the other parts will be omitted. In the description of the second embodiment, in order to facilitate understanding, the antenna forming surface on which the first linear element is formed is formed with the first antenna forming surface and the second linear element. The antenna forming surface is referred to as a second antenna forming surface.
[0028]
The dielectric antenna 41 according to the second embodiment includes a rectangular parallelepiped laminated dielectric 47 in which an insulating upper substrate 43, an intermediate substrate 44, and a lower substrate 45 made of a dielectric ceramic material are laminated. Each of these substrates may be a single-layer body or a laminate. In the drawings, each substrate is depicted as a single-layer body for the convenience of drawing. Since the upper substrate 43, the middle substrate 44, and the lower substrate 45 are all formed in a rectangle (rectangle) having the same size when viewed in a plan view, the laminated dielectric 47 formed by laminating the three members has a rectangular parallelepiped shape. Become. The upper surface of the middle substrate 44 (the surface facing the upper substrate 43) is a first antenna forming surface 49 for forming a first linear element 50 described later. The upper surface of the lower substrate 45 (the surface facing the middle substrate 44) is a second antenna forming surface 55 for forming the second linear element 56. The upper substrate 43 is not for forming an antenna, but is a dielectric layer whose main purpose is to protect the first linear element 50 formed on the first antenna forming surface 49 and the like. The laminated dielectric 47 has a three-layer structure, but may have a two-layer structure by omitting the upper substrate 43. Further, another layer substrate may be further laminated to form a structure of four or five or more layers. The first linear element 50 has basically the same structure as the first linear element 11 of the first embodiment.
[0029]
As shown in FIGS. 5 and 6, the second linear element 56 is formed on the second antenna forming surface 55 in a loop structure similar to the second linear element 31 of the first embodiment. The second linear element 56 is connected to the first linear element 50 via connecting conductors 59 and 60 described below, and the second linear element 56 is connected without such a connecting conductor. It is different from the linear element 31.
[0030]
The first linear element 50 has a branch point 51, and the linear conductor 53 has an end point 54. The second linear element 56 has a branch portion 57 and a terminal portion 58 at both ends. The branch portion 57 of the second linear element is configured to be connectable to the branch point 51 of the first linear element via a connecting conductor 59, and the terminal portion 58 is connected to the terminal point via a connecting conductor 60. It is configured to be connectable to 54. A part or all of the connecting conductors 59 and 60 are arranged on the outer peripheral end surface of the middle layer substrate 44. Therefore, the substantial length of the second linear element 56 is equal to the total length of the second linear element 56 plus the total length of the connecting conductor 59. Accordingly, it is possible to reduce the length of the second linear element 56 by the length of the connecting conductors 59 and 60. The connection conductors 59 and 60 shown in FIG. 5 extend not only to the middle substrate 44 but also to the outer peripheral end surfaces of the lower substrate 45 and the upper substrate 43. This is because the connecting conductors 59 and 60 of the second embodiment are formed by applying a conductive paste, and it is easier to form the connecting conductors 59 and 60 not only on the middle substrate 44 but also on another substrate. Up to. If the connection conductors 59 and 60 can be formed by applying only the portion related to the middle layer substrate 44 or by other means, the other portions other than the portion may be omitted. Reference numeral 61 indicates a power supply terminal, and reference numeral 62 indicates a ground terminal.
[0031]
(Structure of the third embodiment)
The third embodiment will be described with reference to FIG. The third embodiment differs from the second embodiment in that the second linear element is coupled to the first linear element and the linear conductor via a capacitor structure. Here, only the different points will be described, and the description of the common points will be omitted. That is, the dielectric antenna 71 is constituted by a laminated dielectric 77 composed of three layers: an upper substrate 73, an intermediate substrate 74, and a lower substrate 75. Each substrate may be a single layer or a laminate. In the third embodiment, the upper surface of the lower substrate 75 is the first antenna forming surface 79, and the upper surface of the intermediate substrate 74 is the second antenna forming surface 85. The shape of the first linear element 80 formed on the first antenna forming surface 79 is substantially the same as the first linear element 50 of the second embodiment. The second linear element 86 formed on the second antenna forming surface 85 has a branch opposing portion 87 and a terminal opposing portion 88 at both ends. Reference numeral 82 indicates a power supply terminal, and reference numeral 83 indicates a ground terminal. The branch opposing portion 87 is opposed to the branch portion 81 a in the middle of the first linear element 80, and the terminal opposing portion 88 is opposed to the terminal portion 81 b which is a part of the linear conductor 81 via the intermediate substrate 74. is there. As a result, the second linear element 86 is connected at a high frequency to the first linear element 80 and the linear conductor 81 via the capacitor structure sandwiching the middle substrate 74. Note that the coupling to the first linear element 80 or the linear conductor 81 via the capacitor structure may be directly coupled to the branch portion 81a or the termination portion 81b of the second linear element 86 for the reason of impedance matching or the like. Good.
[0032]
The reason why the capacitor structure is formed between the second linear element 86 and the first linear element 80 is to match the impedance of this large feed point close to, for example, 50Ω. The impedance matching is performed by adjusting the area of the branch opposing portion 87 of the second linear element 86 facing the first linear element 80 and the area of the end opposing portion 88 facing the linear conductor 81. Along with this adjustment or instead of this adjustment, the thickness of the middle substrate 74 may be changed to achieve the matching.
[0033]
The dielectric antenna 1 described so far can be built in various mobile communication devices. As the mobile communication device, for example, there are a mobile phone, an amateur / business radio communication device, and a small computer 101 as shown in FIG.
[0034]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the dielectric antenna which concerns on this invention, the interference between elements is suppressed although being small, and the fall of the radiation efficiency of a radio wave and the obstruction of a broadband are eliminated as much as possible. Therefore, according to the mobile communication device incorporating such a dielectric antenna, the size of the mobile communication device itself can be reduced, and comfortable mobile communication can be performed through good transmission and reception of radio waves.
[Brief description of the drawings]
FIG. 1 is a perspective view of a dielectric antenna according to a first embodiment.
FIG. 2 is a perspective view showing the structure of the laminated dielectric shown in FIG.
FIG. 3 is a plan view showing a state where an upper substrate of the dielectric antenna shown in FIG. 2 is omitted.
FIG. 4 is a table showing characteristics of the dielectric antenna shown in FIG.
FIG. 5 is a perspective view illustrating a structure of a dielectric antenna according to a second embodiment.
6 is a plan view showing a state where an upper substrate of the dielectric antenna shown in FIG. 5 is omitted.
FIG. 7 is a perspective view of a dielectric antenna according to a third embodiment.
FIG. 8 is a front view of a small computer including a dielectric antenna.
[Explanation of symbols]
1,41,71 dielectric antenna
3,43,73 Upper substrate
44,74 Middle layer substrate
5,45,75 Lower substrate
7,47,77 Multilayer dielectric
9 Antenna forming surface
9a, 9b, 9c, 9d Outer circumference
11,50,80 1st linear element
12 Base end
13 First part
14 Third part
15 Second part
16 4th part
17 Open end
19,61,82 Power supply terminal
21, 62, 83 Ground terminal
23, 33, 51 junction
25, 53, 81 Linear conductor
27 Bend
31, 56, 86 Second linear element
34 1st return section
35 Second return section
36 Folding part
37 Return
38 Bend
39,54 terminal point
49, 79 First antenna forming surface
55, 85 Second antenna forming surface
57, 81a Branch
58, 81b Terminal part
59,60 Connecting conductor
87 Branch opposite part
88 Final counterpart
101 Small computer (mobile communication device)
k1 1st bending part
k2 2nd bending part
k3 3rd bending part
G ground part
P power supply

Claims (6)

A laminated dielectric having a rectangular antenna forming surface and an outer peripheral end surface,
A first linear element extending on the antenna forming surface adjacent to the outer periphery of the antenna forming surface and capable of resonating at a first resonance frequency;
A power supply terminal connected to the base end of the linear element,
A linear conductor that branches on the antenna forming surface from near the base end of the linear element,
A ground terminal connected to the end of the linear conductor,
On the antenna forming surface, a second linear element that branches off from the middle of the first linear element, terminates in the middle of the linear conductor, and can resonate at a second resonance frequency different from the first resonance frequency. And a dielectric element. 2. The dielectric antenna according to claim 1, wherein the second linear element has a length equal to a wavelength of the second resonance frequency. 3. A plurality of the antenna forming surfaces are provided,
The first linear element is formed on one surface of the antenna forming surface,
The second linear element is formed on the other surface of the antenna forming surface,
2. The capacitor according to claim 1, wherein the second linear element has a capacitor structure between a branch point with the first linear element and / or an end point with the linear conductor. 3. Dielectric antenna. A plurality of the antenna forming surfaces are provided,
The first linear element is formed on one surface of the antenna forming surface,
The second linear element is formed on the other surface of the antenna forming surface,
A connecting conductor is provided for connecting a branch point of the first linear element and an end point of the linear conductor, and a part or all of the connecting conductor is arranged on an outer peripheral end surface of the laminated dielectric. The dielectric antenna according to claim 1 or 2, wherein: The first linear element includes a first bent portion, a second bent portion, and a third bent portion located in order from the base end,
The first portion of the linear element located between the base end and the first bent portion, and the second portion of the linear element located between the second bent portion and the tip, Facing the antenna forming surface at a maximum distance,
The third portion of the linear element located between the first bent portion and the second bent portion, and the fourth portion of the linear element located between the third bent portion and the tip end The dielectric antenna according to any one of claims 1 to 4, wherein the dielectric antenna faces the antenna forming surface at a maximum distance. A mobile communication device incorporating the dielectric antenna according to claim 1.

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