WO2016203921A1 - Dispositif d'antenne - Google Patents

Dispositif d'antenne Download PDF

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Publication number
WO2016203921A1
WO2016203921A1 PCT/JP2016/065463 JP2016065463W WO2016203921A1 WO 2016203921 A1 WO2016203921 A1 WO 2016203921A1 JP 2016065463 W JP2016065463 W JP 2016065463W WO 2016203921 A1 WO2016203921 A1 WO 2016203921A1
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WO
WIPO (PCT)
Prior art keywords
electrode plate
slot
mode electrode
order mode
axis direction
Prior art date
Application number
PCT/JP2016/065463
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English (en)
Japanese (ja)
Inventor
英樹 上田
Original Assignee
株式会社村田製作所
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Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2016203921A1 publication Critical patent/WO2016203921A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/04—Multimode antennas

Definitions

  • the present invention relates to an antenna device suitable for use in high-frequency signals such as microwaves and millimeter waves.
  • Patent Document 1 discloses a stacked microstrip antenna in which a strip conductor is provided inside a substrate, a patch is provided on the surface of the substrate in a state where the strip conductor partially overlaps, and the strip conductor and the patch are coupled. It is disclosed.
  • Patent Document 2 discloses a microstrip antenna in which two radiation electrodes having different resonance modes are stacked.
  • Patent Literature 1 excites a single patch, and thus there is a problem that, for example, the degree of freedom of antenna directivity is low, and desired directivity cannot be obtained.
  • the present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide an antenna device that can easily adjust the frequency characteristics and directivity of impedance matching.
  • an antenna device includes a first electrode plate that is fed from a feed line and excited in one of a higher-order mode and a fundamental mode, and the first electrode plate. And a second electrode plate that is stacked on the first electrode plate in a state of being separated from the first electrode plate and is excited in the other mode of the fundamental mode and the higher-order mode by being coupled to the first electrode plate.
  • the first electrode plate is provided with a first slot in the middle of the length direction in which the current flows, and the second electrode plate has a second slot in the middle of the length direction in which the current flows. Slots are provided.
  • the first electrode plate is excited in a higher-order mode and the second electrode plate is excited in a fundamental mode, thereby combining the antenna directivities in these two different modes to obtain a desired Directivity characteristics can be obtained.
  • the size and shape of the first and second slots can be set as appropriate. The amount of coupling between the first electrode plate and the second electrode plate can be adjusted. For this reason, the frequency characteristic of impedance matching can be adjusted according to the amount of coupling between the first electrode plate and the second electrode plate. Even when the first electrode plate is excited in the basic mode and the second electrode plate is excited in the higher order mode, the same effect is obtained.
  • the first slot is disposed at an antinode of the standing wave current in the first electrode plate.
  • the first slot is disposed at the antinode of the standing wave current in the first electrode plate, for example, when exciting the first electrode plate in a higher mode, the first electrode A standing wave current flows through the plate while bypassing the first slot. For this reason, compared with the case where the first slot is omitted, the path of the current flowing around the first slot can be lengthened, and the length of the first electrode plate with respect to the length direction in which the current flows. The size can be reduced. In addition, a region having a strong electric field can be disposed around the first slot. On the other hand, for example, when the second electrode plate is excited in the fundamental mode, a region having a strong electric field is arranged at the edge of the second electrode plate.
  • the amount of coupling between the first electrode plate and the second electrode plate can be increased by bringing the position of the first slot closer to the edge of the second electrode plate. Further, by separating the position of the first slot from the edge of the second electrode plate, the amount of coupling between the first electrode plate and the second electrode plate can be reduced. Even when the first electrode plate is excited in the basic mode and the second electrode plate is excited in the higher order mode, the same effect is obtained.
  • the second slot is disposed at the antinode of the standing wave current in the second electrode plate.
  • the second slot is disposed at the antinode of the standing wave current in the second electrode plate, the second electrode plate is stationary with the second slot bypassed. Wave current flows. For this reason, compared with the case where the second slot is omitted, the path of the current flowing around the second slot can be lengthened, and the length of the second electrode plate with respect to the length direction in which the current flows. The size can be reduced.
  • the first slot and the second slot are formed with a crossing angle.
  • the direction of the electromagnetic field can be inclined between the first electrode plate and the second electrode plate, and the circular polarization is reduced. Waves can be transmitted or received. Further, the coupling amount between the first electrode plate and the second electrode plate can be adjusted according to the crossing angle between the first slot and the second slot.
  • FIG. 3 is a cross-sectional view of the patch antenna as seen from the direction of arrows III-III in FIG.
  • FIG. 4 is a cross-sectional view of the patch antenna as seen from the direction of arrows IV-IV in FIG. 3.
  • FIG. 3 shows the high order mode electrode plate etc. of a patch antenna.
  • It is explanatory drawing which shows the electric field distribution of a patch antenna in the same position as FIG. In a 1st embodiment and a comparative example, it is a characteristic line figure showing a frequency characteristic of return loss.
  • FIG. 1st embodiment and a comparative example it is a characteristic line figure showing a radiation pattern of an antenna.
  • It is a perspective view which shows the patch antenna by the 2nd Embodiment of this invention.
  • It is a top view which shows the patch antenna in FIG.
  • It is sectional drawing which looked at the patch antenna from the arrow XI-XI direction in FIG.
  • It is explanatory drawing which shows the electric field distribution of a patch antenna in the same position as FIG.
  • FIG. 3 shows the patch antenna by a 1st modification.
  • FIG. 3 shows the patch antenna by a 2nd modification.
  • the patch antenna 1 includes a multilayer substrate 2, a ground conductor plate 6, a higher-order mode electrode plate 7, a strip line 9, and a basic mode electrode plate 12.
  • the multilayer substrate 2 is formed in a flat plate shape extending in parallel with the X axis direction and the Y axis direction, for example, among the X axis direction, the Y axis direction, and the Z axis direction orthogonal to each other.
  • the multilayer substrate 2 has a width dimension of, for example, about several mm with respect to the Y-axis direction serving as the width direction, and has a length dimension of, for example, about several mm with respect to the X-axis direction serving as the length direction. For example, it has a thickness dimension of about several hundred ⁇ m with respect to the Z-axis direction which is the thickness direction.
  • the multilayer substrate 2 is formed of, for example, a ceramic material or a resin material as an insulating material.
  • the multilayer substrate 2 has three insulating layers 3 to 5 stacked in the Z-axis direction from the front surface 2A side to the back surface 2B side. Each of the insulating layers 3 to 5 is formed in a thin layer shape.
  • the grounding conductor plate 6 is formed using a conductive metal material such as copper or silver and connected to the ground. Specifically, the ground conductor plate 6 is formed of a metal thin film and covers substantially the entire surface of the multilayer substrate 2. The ground conductor plate 6 is disposed on the back surface 2B of the multilayer substrate 2 (the back surface of the insulating layer 5).
  • the higher-order mode electrode plate 7 constitutes a first electrode plate. Therefore, the high-order mode electrode plate 7 is fed from the strip line 9 serving as a feed line, and is excited in a high-order mode (one mode) among the high-order mode and the fundamental mode.
  • the high-order mode electrode plate 7 is formed using, for example, the same conductive metal material as that of the ground conductor plate 6 and faces the ground conductor plate 6 with a gap.
  • the high-order mode electrode plate 7 is formed of a substantially rectangular metal thin film and is disposed between the insulating layer 3 and the insulating layer 4. Insulating layers 4 and 5 are disposed between the high-order mode electrode plate 7 and the ground conductor plate 6. Therefore, the higher-order mode electrode plate 7 faces the ground conductor plate 6 while being insulated from the ground conductor plate 6.
  • the higher-order mode electrode plate 7 has a longer length dimension L2 in the X-axis direction than a width dimension L1 in the Y-axis direction.
  • the length dimension L2 of the high-order mode electrode plate 7 in the X-axis direction is set to a value smaller than 1.5 wavelengths of the high frequency signal to be used, for example, in terms of electrical length.
  • a via 11 is connected to the high-order mode electrode plate 7 in the middle of the X-axis direction, and a strip line 9 is connected via the via 11. Then, a current Ih flows in the X-axis direction through the high-order mode electrode plate 7 by feeding from the strip line 9.
  • the standing wave current Ih node portions Kh are generated at a plurality of places on the higher-order mode electrode plate 7 and an antinode portion is formed at a plurality of places on the higher-order mode electrode plate 7.
  • the standing wave current Ih for example, has four node portions Kh and three belly portions along the X-axis direction on the higher-order mode electrode plate 7, for example. Thereby, the higher-order mode electrode plate 7 is excited in, for example, a second-order higher-order mode. At this time, the electric field E tends to increase around the node portion Kh.
  • the first slot 8 is provided in the middle position in the X-axis direction in which the current Ih flows in the higher-order mode electrode plate 7.
  • the first slot 8 is disposed in the vicinity of the central portion in the X-axis direction of the higher-order mode electrode plate 7.
  • the first slot 8 is arranged at the antinode of the standing wave current Ih in the higher-order mode electrode plate 7.
  • the first slot 8 is formed by an elongated groove extending in the Y-axis direction orthogonal to the X-axis direction. Specifically, the first slot 8 is formed by, for example, a rectangular opening that penetrates the higher-order mode electrode plate 7 in the Z-axis direction (thickness direction).
  • the first slot 8 has a groove width dimension L3 in the X-axis direction and a length dimension L4 in the Y-axis direction.
  • the length dimension L4 of the first slot 8 is longer than the groove width dimension L3 of the first slot 8, for example.
  • the length L4 of the first slot 8 is set to a value smaller than a half wavelength of the high-frequency signal to be used, for example, as an electrical length.
  • the first slot 8 blocks the current Ih from flowing across the first slot 8 in the X-axis direction. For this reason, the current Ih bypasses the first slot 8 and flows around the first slot 8 in the higher-order mode electrode plate 7. At this time, the two node portions Kh of the standing wave current Ih are arranged on both sides in the X-axis direction with the first slot 8 interposed therebetween.
  • the strip line 9 constitutes a feed line that feeds power to the higher-order mode electrode plate 7.
  • the strip line 9 includes a ground conductor plate 6 and a strip conductor 10 provided to face the ground conductor plate 6 while being separated from the ground conductor plate 6.
  • the strip conductor 10 is made of, for example, a conductive metal material similar to that of the ground conductor plate 6 and is formed in an elongated strip shape.
  • the strip conductor 10 is disposed between the insulating layer 4 and the insulating layer 5.
  • the strip conductor 10 extends in the X-axis direction, for example.
  • the end portion of the strip conductor 10 is disposed on one side of the high-order mode electrode plate 7 with respect to the center position in the X-axis direction, and is connected to the high-order mode electrode plate 7 via a via 11 as a connection line. Yes.
  • the via 11 is formed as a columnar conductor by providing a conductive metal material such as copper or silver in a through hole penetrating the insulating layer 4 and having an inner diameter of about several tens to several hundreds ⁇ m (for example, 100 ⁇ m). .
  • the via 11 extends in the Z-axis direction.
  • the base end of the via 11 is connected to the ground conductor plate 6, and the tip of the via 11 is connected to the higher-order mode electrode plate 7.
  • the via 11 is arranged at a position between the node portion Kh and the antinode portion of the standing wave current Ih in the X-axis direction in the higher-order mode electrode plate 7 with respect to the X-axis direction.
  • the basic mode electrode plate 12 constitutes a second electrode plate. For this reason, the fundamental mode electrode plate 12 is coupled with the higher-order mode electrode plate 7 and is excited in the fundamental mode (the other mode) of the higher-order mode and the fundamental mode.
  • the basic mode electrode plate 12 is formed in a substantially square shape using, for example, the same conductive metal material as that of the ground conductor plate 6, and is positioned on the opposite side to the ground conductor plate 6 when viewed from the higher-order mode electrode plate 7. It is disposed on the surface 2A of the substrate 2 (the surface of the insulating layer 3). The insulating layer 3 is disposed between the basic mode electrode plate 12 and the higher-order mode electrode plate 7.
  • the basic mode electrode plate 12 faces the high-order mode electrode plate 7 with an interval while being insulated from the high-order mode electrode plate 7 and the ground conductor plate 6. Thereby, the fundamental mode electrode plate 12 is provided so as to be stacked on the higher order mode electrode plate 7 in a state of being separated from the higher order mode electrode plate 7.
  • the basic mode electrode plate 12 has a width dimension L5 in the Y-axis direction and a length dimension L6 in the X-axis direction.
  • the width dimension L5 of the basic mode electrode plate 12 is larger than the width dimension L1 of the higher-order mode electrode plate 7, for example.
  • the width dimension L5 of the basic mode electrode plate 12 may be smaller than the width dimension L1 of the higher-order mode electrode plate 7.
  • the length dimension L6 of the basic mode electrode plate 12 is smaller than the length dimension L2 of the higher-order mode electrode plate 7, for example.
  • the length dimension L6 in the X-axis direction of the basic mode electrode plate 12 is set to a value smaller than a half wavelength of the high-frequency signal to be used, for example, as an electrical length.
  • the second slot 13 is formed by an elongated groove extending in the Y-axis direction orthogonal to the X-axis direction. Specifically, the second slot 13 is formed by, for example, a rectangular opening that penetrates the basic mode electrode plate 12 in the Z-axis direction (thickness direction).
  • the second slot 13 has a groove width dimension L7 in the X-axis direction and a length dimension L8 in the Y-axis direction.
  • the length dimension L8 of the second slot 13 is longer than the groove width dimension L7 of the second slot 13, for example.
  • the length dimension L8 of the second slot 13 is set to a value smaller than the half wavelength of the high-frequency signal to be used, for example, as an electrical length.
  • the patch antenna 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.
  • the direction away from the multilayer substrate 2 in the Z-axis direction from the center position of the higher-order mode electrode plate 7 is defined as 0 degree.
  • a direction inclined toward the strip line 9 in the X-axis direction is defined as a positive angle
  • a direction inclined toward the basic mode electrode plate 12 in the X-axis direction is defined as a negative angle.
  • the first and second slots 8 and 13 are provided (first The frequency characteristics and radiation pattern of the return loss (S parameter S11) were measured for the first embodiment) and when omitted (comparative example). The results are shown in FIGS.
  • the first slot 8 is arranged at the antinode of the standing wave current Ih in the higher-order mode electrode plate 7, the first-order mode electrode plate 7 is fixed in a state where the first slot 8 is bypassed.
  • the standing wave current Ih flows. Therefore, as compared with the case where the first slot 8 is omitted, the path of the current Ih flowing around the first slot 8 can be lengthened, and the length dimension L2 of the high-order mode electrode plate 7 is reduced. be able to.
  • a region having a strong electric field E (a node portion Kh of the standing wave current Ih) can be disposed around the first slot 8.
  • a region where the electric field E is strong (a node portion Kf of the standing wave current If) is arranged at the edge portion.
  • the amount of coupling between the higher-order mode electrode plate 7 and the fundamental mode electrode plate 12 can be increased by bringing the position of the first slot 8 close to the edge of the fundamental mode electrode plate 12. Further, by separating the position of the first slot 8 from the edge of the fundamental mode electrode plate 12, the amount of coupling between the higher-order mode electrode plate 7 and the fundamental mode electrode plate 12 can be reduced.
  • the fundamental mode electrode plate 12 since the second slot 13 is disposed at the antinode of the standing wave current If in the fundamental mode electrode plate 12, the fundamental mode electrode plate 12 has a standing wave with the second slot 13 bypassed. A current If flows. For this reason, the path of the current If flowing around the second slot 13 can be made longer than when the second slot 13 is omitted, and the length dimension L6 of the basic mode electrode plate 12 can be made smaller. Can do.
  • the patch antenna 21 includes a multilayer substrate 2, a ground conductor plate 6, a high-order mode electrode plate 7, a strip line 9, and a basic mode electrode plate 22.
  • the basic mode electrode plate 22 is formed in a substantially square shape using, for example, the same conductive metal material as that of the ground conductor plate 6, and is positioned on the opposite side to the ground conductor plate 6 when viewed from the higher-order mode electrode plate 7. It is disposed on the surface 2A of the substrate 2 (the surface of the insulating layer 3). An insulating layer 3 is disposed between the basic mode electrode plate 22 and the higher-order mode electrode plate 7. For this reason, the basic mode electrode plate 22 faces the high-order mode electrode plate 7 with an interval while being insulated from the high-order mode electrode plate 7 and the ground conductor plate 6. Thus, the basic mode electrode plate 22 is provided so as to be stacked on the higher order mode electrode plate 7 in a state of being separated from the higher order mode electrode plate 7.
  • the basic mode electrode plate 22 generates electromagnetic field engagement with the higher-order mode electrode plate 7. At this time, the basic mode electrode plate 22 faces the peripheral portion of the first slot 8 in the higher-order mode electrode plate 7. For this reason, the fundamental mode electrode plate 22 is strongly coupled to the periphery of the central portion in the X-axis direction of the higher order mode electrode plate 7 excited in the higher order mode.
  • the magnitude relationship between the basic mode electrode plate 22 and the higher-order mode electrode plate 7 and the specific shapes thereof are not limited to those described above, and are appropriately set in consideration of the radiation pattern of the patch antenna 21 and the like. is there.
  • the second slot 23 is provided at an intermediate position in the X-axis direction through which the current If flows in the basic mode electrode plate 22.
  • the second slot 23 is disposed in the vicinity of the central portion of the basic mode electrode plate 22 in the X-axis direction.
  • the second slot 23 is arranged at the antinode position of the standing wave current If in the basic mode electrode plate 12.
  • the second slot 23 is formed with a predetermined crossing angle ⁇ with the first slot 8.
  • the second slot 23 is formed by an elongated groove extending in the inclined direction between the X-axis direction and the Y-axis direction.
  • the second slot 23 is formed by, for example, a rectangular opening that penetrates the basic mode electrode plate 22 in the Z-axis direction (thickness direction).
  • the second slot 23 has a groove width dimension L11 and a length dimension L12.
  • the length dimension L12 of the second slot 23 is longer than the groove width dimension L11 of the second slot 13, for example.
  • the length dimension L12 of the second slot 23 is set to a value smaller than a half wavelength of the high-frequency signal to be used, for example, as an electrical length.
  • the crossing angle ⁇ between the second slot 23 and the first slot 8 is set to a value of, for example, about 30 degrees to about 60 degrees.
  • the crossing angle ⁇ may be a value of 30 degrees or less or a value of 60 degrees or more.
  • the second slot 23 blocks the current If from flowing in the X-axis direction across the second slot 23. Therefore, the current If flows around the second slot 23 in the basic mode electrode plate 22, bypassing the second slot 23.
  • the same operational effects as those in the first embodiment can be obtained.
  • the direction of the electromagnetic field is inclined between the higher-order mode electrode plate 7 and the fundamental mode electrode plate 22.
  • the amount of coupling between the higher-order mode electrode plate 7 and the basic mode electrode plate 22 can be adjusted according to the crossing angle ⁇ between the first slot 8 and the second slot 23.
  • the case where the higher-order mode electrode plate 7 is disposed between the basic mode electrode plate 12 and the ground conductor plate 6 has been described as an example.
  • the present invention is not limited to this.
  • a basic mode electrode plate 34 is disposed between the higher-order mode electrode plate 32 and the ground conductor plate 6 as in the patch antenna 31 according to the first modification shown in FIG. Also good.
  • the high-order mode electrode plate 32 constitutes a first electrode plate, and the via 11 is connected thereto. Thereby, the high-order mode electrode plate 32 is fed from the strip line 9 (feed line) and excited in the high-order mode.
  • a first slot 33 is formed in the higher mode electrode plate 32.
  • the higher-order mode electrode plate 7 constitutes the first electrode plate
  • the basic mode electrode plate 12 constitutes the second electrode plate.
  • the present invention is not limited to this.
  • the basic mode electrode plate 42 constitutes the first electrode plate
  • the higher-order mode electrode plate 44 is the second electrode plate.
  • the electrode plate may be configured.
  • the basic mode electrode plate 42 is connected to the via 11 and is fed from the strip line 9 (feeding line), and is excited in the fundamental mode (one mode) of the higher order mode and the fundamental mode.
  • the basic mode electrode plate 42 has a first slot 43 formed therein.
  • the patch antennas 1 and 21 are formed on the multilayer substrate 2 has been described as an example.
  • the patch antenna may be formed by providing a conductor plate or the like on a single-layer substrate. .
  • the strip line 9 is constituted by the strip conductor 10 and the ground conductor plate 6 provided on one side of the strip conductor 10 in the Z-axis direction.
  • the present invention is not limited to this, and the strip line may be constituted by two ground conductor plates spaced apart in the Z-axis direction and a strip conductor provided between the two ground conductor plates.
  • the strip line 9 is used as the feed line has been described as an example.
  • other feed lines such as a microstrip line, a coplanar line, and a coaxial cable may be used.

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  • Waveguide Aerials (AREA)

Abstract

La présente invention concerne une plaque conductrice de mise à la terre (6) qui est prévue sur une surface arrière (2B) d'un substrat multicouche (2). Dans le substrat multicouche (2), une plaque d'électrode de mode d'ordre élevé (7) est prévue en étant positionnée entre des couches isolantes (3, 4). Près de la position centrale de la plaque d'électrode de mode d'ordre élevé (7), une première fente (8) est pratiquée. Une ligne ruban (9) est reliée à la plaque d'électrode de mode d'ordre élevé (7). Sur une surface avant (2A) du substrat multicouche (2), une plaque d'électrode de mode de base (12) est ménagée, ladite plaque d'électrode de mode de base faisant face à la plaque d'électrode de mode d'ordre élevé (7). Près de la position centrale de la plaque d'électrode de mode de base (12), une seconde fente (13) est pratiquée. La plaque d'électrode de mode d'ordre élevé (7) et la plaque d'électrode de mode de base (12) sont couplées par couplage de champ électromagnétique. Par conséquent, lorsque la plaque d'électrode de mode d'ordre élevé (7) est mise en oscillation en mode d'ordre élevé, la plaque d'électrode de mode de base (12) est mise en oscillation en mode de base.
PCT/JP2016/065463 2015-06-16 2016-05-25 Dispositif d'antenne WO2016203921A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-121054 2015-06-16
JP2015121054 2015-06-16

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WO2016203921A1 true WO2016203921A1 (fr) 2016-12-22

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62176307A (ja) * 1986-01-30 1987-08-03 Nec Corp 円偏波マイクロストリツプアンテナ
JPH0669718A (ja) * 1992-08-21 1994-03-11 Toyo Commun Equip Co Ltd スタック型マイクロストリップアンテナ
JPH07221535A (ja) * 1994-02-08 1995-08-18 Japan Radio Co Ltd マイクロストリップアンテナ
JPH09232857A (ja) * 1996-02-21 1997-09-05 Toyo Commun Equip Co Ltd マイクロストリップアンテナ
JP2000244231A (ja) * 1999-02-24 2000-09-08 Yokowo Co Ltd マイクロストリップアンテナ及びその共振周波数の調整方法
JP2008228094A (ja) * 2007-03-14 2008-09-25 Sansei Denki Kk マイクロストリップアンテナ装置
JP2008252881A (ja) * 2007-03-06 2008-10-16 Japan Radio Co Ltd パッチアンテナ
JP2009077004A (ja) * 2007-09-19 2009-04-09 Kojima Press Co Ltd 車両用アンテナ装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62176307A (ja) * 1986-01-30 1987-08-03 Nec Corp 円偏波マイクロストリツプアンテナ
JPH0669718A (ja) * 1992-08-21 1994-03-11 Toyo Commun Equip Co Ltd スタック型マイクロストリップアンテナ
JPH07221535A (ja) * 1994-02-08 1995-08-18 Japan Radio Co Ltd マイクロストリップアンテナ
JPH09232857A (ja) * 1996-02-21 1997-09-05 Toyo Commun Equip Co Ltd マイクロストリップアンテナ
JP2000244231A (ja) * 1999-02-24 2000-09-08 Yokowo Co Ltd マイクロストリップアンテナ及びその共振周波数の調整方法
JP2008252881A (ja) * 2007-03-06 2008-10-16 Japan Radio Co Ltd パッチアンテナ
JP2008228094A (ja) * 2007-03-14 2008-09-25 Sansei Denki Kk マイクロストリップアンテナ装置
JP2009077004A (ja) * 2007-09-19 2009-04-09 Kojima Press Co Ltd 車両用アンテナ装置

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