WO2018116886A1 - アンテナ基板およびその製造方法 - Google Patents
アンテナ基板およびその製造方法 Download PDFInfo
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- WO2018116886A1 WO2018116886A1 PCT/JP2017/044405 JP2017044405W WO2018116886A1 WO 2018116886 A1 WO2018116886 A1 WO 2018116886A1 JP 2017044405 W JP2017044405 W JP 2017044405W WO 2018116886 A1 WO2018116886 A1 WO 2018116886A1
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- insulating layer
- substrate
- antenna
- bonding material
- bonding
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Images
Classifications
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Definitions
- the present disclosure relates to an antenna substrate and a manufacturing method thereof.
- the antenna substrate is used for wireless communication between electronic devices or an in-vehicle obstacle detection device.
- the antenna substrate includes a spacer and two mounting substrates.
- Patent Document 1 describes that an antenna substrate is manufactured by a method in which mounting substrates are joined to each other above and below a spacer through solder or the like.
- the antenna substrate transmits and receives electromagnetic waves between the first and second antenna conductors. For this reason, if the positional accuracy of the first and second antenna conductors is poor, stable electromagnetic wave transmission and reception may not be possible.
- the antenna substrate of the present disclosure includes a cap substrate, a frame substrate, a base substrate, a first adhesive material, and a second adhesive material.
- the cap substrate has a first insulating layer and a plurality of first antenna conductors arranged vertically and horizontally in a state of being opposed to each other via the first insulating layer on both upper and lower surfaces of the first insulating layer. is doing.
- the frame substrate is located in the second insulating layer and the second insulating layer, and a plurality of openings having outer peripheries surrounding the outer periphery of the first antenna conductor individually or collectively in a top view. have.
- the base substrate has a third insulating layer and a plurality of second antenna conductors located on the upper surface of the third insulating layer.
- the first adhesive material is in a region other than the region where the opening is located between the lower surface of the first insulating layer and the upper surface of the second insulating layer, and the first insulating layer and the second insulating layer And are bonded.
- the second adhesive material is in a region other than the region where the opening is located between the lower surface of the second insulating layer and the upper surface of the third insulating layer, and the second insulating layer and the third insulating layer And are bonded.
- the first adhesive material and the second adhesive material are partially applied to the plurality of first bonding materials and the plurality of first bonding materials, respectively, at least outside the region where the first antenna conductor is disposed.
- the second bonding material is in contact with and has a higher adhesion strength to the second insulating layer than the first bonding material.
- the first insulating layer and the first insulating layer are arranged with vertical and horizontal adjacent spaces so as to face both the upper and lower surfaces of the first insulating layer via the first insulating layer.
- a step of preparing a cap substrate having a plurality of antenna conductors; an outer periphery of the first antenna conductor provided on the second insulating layer and the second insulating layer individually or in a plurality of outer periphery in a top view Preparing a frame substrate having an opening having a surrounding periphery; preparing a base substrate having a third insulating layer and a plurality of second antenna conductors disposed on an upper surface of the third insulating layer; A region other than the region where the opening is located between the lower surface of the first insulating layer and the upper surface of the second insulating layer and between the lower surface of the second insulating layer and the upper surface of the third insulating layer;
- the first bonding material is disposed on the first bonding material
- FIG. 1A is a schematic top view illustrating a first exemplary embodiment of an antenna substrate according to the present disclosure.
- 1B is a schematic cross-sectional view taken along the line XX shown in FIG. 1A.
- FIG. 2 is a schematic top view illustrating the second embodiment of the antenna substrate of the present disclosure.
- Drawing 3A is an outline sectional view showing an example according to a process in a manufacturing method of an antenna substrate of this indication.
- FIG. 3B is a schematic cross-sectional view illustrating an example of each process in the manufacturing method of the antenna substrate of the present disclosure.
- FIG. 3C is a schematic cross-sectional view illustrating an example of each process in the manufacturing method of the antenna substrate of the present disclosure.
- FIG. 3D is a schematic cross-sectional view illustrating an example of each process in the manufacturing method of the antenna substrate of the present disclosure.
- the antenna substrate transmits and receives electromagnetic waves between the first and second antenna conductors. For this reason, if the positional accuracy of the first and second antenna conductors is poor, stable electromagnetic wave transmission and reception may not be possible.
- the antenna substrate of the present disclosure includes a cap substrate having a first antenna conductor, a frame substrate having a plurality of openings, and a base substrate having a second antenna conductor.
- the cap substrate, the base substrate, and the frame substrate are firmly fixed to each other by the second bonding material having a high bonding strength while the position is corrected by bonding through the first bonding material having a relatively low bonding strength. It is joined. Therefore, since the positional accuracy of the first and second antenna conductors is good, stable electromagnetic wave transmission / reception is possible.
- FIG. 1A An antenna substrate according to an embodiment of the present disclosure will be described based on FIGS. 1A, 1B, and 2.
- FIG. 1B An antenna substrate according to an embodiment of the present disclosure will be described based on FIGS. 1A, 1B, and 2.
- FIG. 1A is a top view illustrating an embodiment of an antenna substrate according to the present disclosure.
- 1B is a cross-sectional view taken along the line XX shown in FIG. 1A.
- the antenna substrate A includes a cap substrate 10, a frame substrate 20, and a base substrate 30.
- the antenna substrate A is configured by sequentially stacking the cap substrate 10, the frame substrate 20, and the base substrate 30 from above.
- the cap substrate 10 has a first insulating layer 11 and a plurality of first antenna conductors 12.
- a plurality of first antenna conductors 12 are formed at the center of the upper and lower surfaces of the first insulating layer 11.
- the plurality of first antenna conductors 12 are arranged vertically and horizontally so as to face each other with the first insulating layer 11 interposed therebetween. That is, the first antenna conductor 12 is formed on the upper and lower surfaces of the first insulating layer 11 so as to overlap each other when viewed from above.
- the first insulating layer among the plurality of first antenna conductors 12 on the upper surface of the first insulating layer 11 and the plurality of first antenna conductors 12 on the lower surface of the first insulating layer 11. Those facing each other through 11 are formed in the same shape and size.
- the frame substrate 20 has a second insulating layer 21 and a plurality of openings 22.
- the opening 22 has an outer periphery that surrounds the outer periphery of the first antenna conductor 12 individually or collectively as shown in FIG. 2 in a top view.
- each opening 22 has one first antenna conductor 12 or a plurality of first antenna conductors 12 inside each opening 22 when viewed from above (when viewed from above). Arranged to fit.
- the opening 22 becomes a cavity 13 sandwiched between the cap substrate 10 and the base substrate 30.
- the cavity 13 functions as a path for transmitting and receiving signal electromagnetic waves between the first antenna conductor 12 and the second antenna conductor 32.
- the distance between the first antenna conductor 12 and the second antenna conductor 32 can be adjusted to an optimum distance for transmitting and receiving signal electromagnetic waves by adjusting the thickness of the second insulating layer 21. it can.
- the lower surface of the first insulating layer 11 and the upper surface of the second insulating layer 21 are bonded by the first adhesive material 14. This adhesion is performed at a portion of the first insulating layer 11 and the second insulating layer 21 where the opening 22 is not located (the first adhesive material 14 is a part of the first antenna conductor 12). Or it is arranged so that it doesn't overlap all).
- the first adhesive material 14 includes a first bonding material 15 and a second bonding material 16.
- the first bonding material 15 is made of, for example, natural rubber, nitrile rubber, polyimide resin, or the like.
- the second bonding material 16 is made of, for example, an epoxy resin or an acrylic resin.
- the bonding strength of the second bonding material 16 with respect to the first and second insulating layers 11 and 21 is larger than the bonding strength of the first bonding material 15.
- the bonding strength of the second bonding material 16 is about 10 to 100 times the bonding strength of the first bonding material 15, for example, in the tensile shear bonding strength (JISK6850).
- the base substrate 30 includes a third insulating layer 31, a plurality of second antenna conductors 32, a wiring conductor 33 and an electrode 34.
- the second antenna conductor 32 is disposed on the upper surface of the third insulating layer 31 at a position facing the first antenna conductor 12. As described above, the opening 22 is provided corresponding to the first antenna conductor 12. Therefore, each second antenna conductor 32 directly faces the first antenna conductor 12 in the cavity 13 with a space (air in the cavity 13 or the like) interposed therebetween.
- the third insulating layer 31 has a plurality of through holes 35 penetrating vertically.
- the wiring conductor 33 is formed on the surface of the third insulating layer 31 and inside the through hole 35. A part of the wiring conductor 33 is connected to the second antenna conductor 32.
- the lower surface of the second insulating layer 21 and the upper surface of the third insulating layer 31 are bonded by the second adhesive material 23.
- the second adhesive material 23 includes the first bonding material 15 and the second bonding material 16 described above.
- the first bonding material 15 is used for bonding the first and third insulating layers 11 and 31 and the second insulating layer 21 with high positional accuracy.
- the second bonding material 16 is for firmly bonding the first insulating layer 11, the third insulating layer 31, and the second insulating layer 21.
- the first bonding material 15 has a relatively low adhesion strength to the first, second and third insulating layers 11, 21, 31. In other words, the first bonding material 15 can keep the first and third insulating layers 11 and 31 and the second insulating layer 21 in a state where the mutual positional relationship can be corrected to some extent. . Therefore, the first and third insulating layers 11 and 31 and the second insulating layer 21 are firmly bonded to each other by the second bonding material 16 while the position is corrected by bonding via the first bonding material 15. can do.
- the antenna substrate A includes the first antenna conductor 12 of the first insulating layer 11, the opening 22 of the second insulating layer 21, and the second antenna conductor 32 of the third insulating layer 31 that have been mutually corrected in position. High positional accuracy.
- a plurality of electrodes 34 are formed on the lower surface of the third insulating layer 31.
- the electrode 34 is electrically connected to an electrode of an external electric substrate (not shown). Thereby, the antenna substrate A and the external electric substrate are electrically connected.
- the antenna substrate A has the following functions, for example.
- a signal transmitted from the external electric board is transmitted to the second antenna conductor 32 via the electrode 34 and the wiring conductor 33.
- the second antenna conductor 32 receiving the signal radiates electromagnetic waves.
- the radiated electromagnetic wave propagates in the cavity 13 and sequentially propagates to the first antenna conductor 12 on the lower surface side of the first insulating layer 11 and the first antenna conductor 12 on the upper surface side.
- the first antenna conductor 12 on the upper surface side radiates electromagnetic waves toward the outside.
- the first antenna conductor 12 has a function of transmitting an electromagnetic wave received from outside as a signal to the external electric board along the reverse path.
- electromagnetic wave can be transmitted and received satisfactorily by matching the positional accuracy of the first antenna conductor 12 and the second antenna conductor 32 facing each other.
- the distance between the first antenna conductor 12 and the second antenna conductor 32 is kept constant, so that stable electromagnetic wave transmission / reception can be performed between the two.
- the first to third insulating layers 11, 21, 31 are made of, for example, an electrically insulating material obtained by impregnating a glass cloth with a thermosetting resin such as an epoxy resin or a bismaleimide triazine resin and thermosetting flatly under heat and pressure. Become.
- the opening 22 is formed by, for example, drilling or router processing.
- the through hole 35 is formed by, for example, drilling, laser processing, or blasting.
- the first and second antenna conductors 12 and 32 and the wiring conductor 33 are made of a highly conductive metal such as copper plating by a known plating technique, for example.
- the first and third insulating layers 11 and 31 and the second insulating layer 21 are bonded to each other with a relatively low bonding strength to each insulating layer.
- the first and third insulating layers 11 and 31 and the second insulating layer 21 are firmly bonded to each other by the second bonding material 16 while the position is corrected by bonding via the material 15.
- FIGS. 3A to 3D an example of each process in the manufacturing method of the antenna substrate according to the present disclosure will be described with reference to FIGS. 3A to 3D.
- symbol is attached
- a cap substrate 10, a frame substrate 20, and a base substrate 30 are prepared.
- the first bonding material 15 is disposed on the upper and lower surfaces of the second insulating layer 21 in the frame substrate 20.
- the first bonding material 15 is disposed on the outer peripheral edge of the second insulating layer 21, but may be disposed at a position adjacent to the opening 22.
- the cap substrate 10 is placed on the upper surface of the frame substrate 20 and temporarily fixed.
- the base substrate 30 is placed on the lower surface of the frame substrate 20 and temporarily fixed.
- the cap substrate 10 and the frame substrate 20 and the frame substrate 20 and the base substrate 30 are temporarily fixed. For this reason, it is possible to adjust the facing position between the first antenna conductor 12 and the second antenna conductor 32 that are arranged to face each other.
- first bonding material 15 is partially placed between the cap substrate 10 and the frame substrate 20 in a position-adjusted state and between the frame substrate 20 and the base substrate 30.
- the second bonding material 16 is disposed so as to be in contact with.
- the first bonding material 15 temporarily connects the cap substrate 10 and the frame substrate 20 and between the frame substrate 20 and the base substrate 30. Temporarily fixed. For this reason, the opposing position of the conductor 12 for 1st antennas and the conductor 32 for 2nd antennas can be adjusted.
- the second bonding material 16 is partly in contact with the first bonding material 15 between the cap substrate 10 and the frame substrate 20 that have been adjusted in position and between the frame substrate 20 and the base substrate 30. Is placed. Thereby, the cap substrate 10 and the frame substrate 20 and the frame substrate 20 and the base substrate 30 are permanently fixed. As a result, it is possible to provide the antenna substrate A capable of stably transmitting and receiving signal electromagnetic waves between the first antenna conductor 12 and the second antenna conductor 32.
- the present disclosure is not limited to an example of the above-described embodiment, and various changes or improvements can be made within the scope of the claims.
- the first bonding material 15 is made of only a resin is shown.
- the first bonding material 15 has solid particles and solid fibers having a constant outer diameter. It may contain at least one of these. Thereby, the space
- the solid particles include silica, alumina, titanium oxide and the like.
- solid fibers include glass fibers, carbon fibers, and aramid fibers.
- the first bonding material 15 may be an adhesive tape containing natural rubber, nitrile rubber, polyimide resin, or the like as a component.
- the first bonding material 15 may be any material that can be bonded in a form such as adhesive in a short time even if the bonding strength is smaller than that of the second bonding material 16.
- an adhesive tape that can be temporarily fixed is suitable in terms of workability of temporary fixing.
- an injection hole 17 for arranging the second adhesive material 23 may be provided in either or both of the cap substrate 10 and the base substrate 30.
- Second antenna conductor 10 Cap substrate 11 First insulating layer 12 First antenna conductor 14 First adhesive material 15 First bonding material 16 Second bonding material 20 Frame substrate 21 Second insulating layer 22 Opening 23 Second Adhesive material 30 Base substrate 31 Third insulating layer 32 Second antenna conductor A Antenna substrate
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Abstract
Description
11 第1の絶縁層
12 第1のアンテナ用導体
14 第1の接着材料
15 第1の接合材
16 第2の接合材
20 フレーム基板
21 第2の絶縁層
22 開口部
23 第2の接着材料
30 ベース基板
31 第3の絶縁層
32 第2のアンテナ用導体
A アンテナ基板
Claims (8)
- 第1の絶縁層、および該第1の絶縁層の上下両面に該第1の絶縁層を介して互いに対向する状態で縦横の並びに位置する複数の第1のアンテナ用導体を有するキャップ基板と、
第2の絶縁層、および該第2の絶縁層に位置しており上面視において前記第1のアンテナ用導体の外周を個別に、または複数個一括して囲む外周を有する複数の開口部を有するフレーム基板と、
第3の絶縁層、および該第3の絶縁層の上面に位置する複数の第2のアンテナ用導体を有するベース基板と、
前記第1の絶縁層の下面と前記第2の絶縁層の上面との間で、前記開口部が位置する領域以外の領域にあり、前記第1の絶縁層と前記第2の絶縁層とを接着している第1の接着材料と、
前記第2の絶縁層の下面と前記第3の絶縁層の上面との間で、前記開口部が位置する領域以外の領域にあり、前記第2の絶縁層と前記第3の絶縁層とを接着している第2の接着材料とを備え、
前記第1の接着材料および前記第2の接着材料は、各々少なくとも前記第1のアンテナ用導体が配置された領域の外側にある複数の第1の接合材、および該複数の第1の接合材に部分的に接し、且つ前記第2の絶縁層に対する接着の強さが前記第1の接合材よりも大きい第2の接合材を有していることを特徴とするアンテナ基板。 - 前記第1の接着材料および前記第2の接着材料の少なくともいずれかに関して、前記第1の接合材が、固形粒子および固形繊維の少なくともいずれかを含有していることを特徴とする請求項1に記載のアンテナ基板。
- 前記第1の接着材料および前記第2の接着材料の両方に関して、前記第1の接合材が、固形粒子および固形繊維の少なくともいずれかを含有していることを特徴とする請求項1に記載のアンテナ基板。
- 前記第1のアンテナ用導体が、上面視において第1の絶縁層の上下面に、互いに重畳する請求項1に記載のアンテナ基板。
- 第1の絶縁層の上面の複数の第1のアンテナ用導体と、第1の絶縁層の下面の複数の第1のアンテナ用導体とのうち、第1の絶縁層を介して互いに対向し合うものは、互いに同じ形状および寸法である請求項4に記載のアンテナ基板。
- 前記キャップ基板とベース基板とに挟まれた前記開口部は、第1のアンテナ用導体と第2のアンテナ用導体との間において、信号用の電磁波を送受信するための経路として機能するキャビティである請求項1~5のいずれかに記載のアンテナ基板。
- 第1の絶縁層、該第1の絶縁層の上下両面に該第1の絶縁層を介して対向する状態で縦横の並びに隣接間隔を設けて配置された第1のアンテナ用導体を有するキャップ基板を準備する工程と、
第2の絶縁層、該第2の絶縁層に位置しており上面視において前記第1のアンテナ用導体の外周を個別または複数の前記外周を一括に囲む外周を有する開口部を有するフレーム基板を準備する工程と、
第3の絶縁層、該第3の絶縁層の上面に配置された複数の第2のアンテナ用導体を有するベース基板を準備する工程と、
前記第1の絶縁層の下面と前記第2の絶縁層の上面との間、および前記第2の絶縁層の下面と前記第3の絶縁層の上面との間で、前記開口部が位置する領域以外の領域に、第1の接合材を配置し、該第1の接合材を介して、前記ベース基板上に前記フレーム基板および前記キャップ基板を、この順序に載置して仮固定する工程と、
前記第1の絶縁層の下面と前記第2の絶縁層の上面との間、および前記第2の絶縁層の下面と前記第3の絶縁層の上面との間に、前記第1の接合材に部分的に接する第2の接合材を配置して、該第2の接合材によって前記ベース基板と前記フレーム基板と前記キャップ基板とを本固定する工程と、
を含むことを特徴とするアンテナ基板の製造方法。 - 前記第1の接合材として、固形粒子および固形繊維の少なくともいずれかを含有している接合材を用いることを特徴とする請求項7に記載のアンテナ基板の製造方法。
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