JPH10322124A - Wide-band plate-shaped antenna - Google Patents
Wide-band plate-shaped antennaInfo
- Publication number
- JPH10322124A JPH10322124A JP14455897A JP14455897A JPH10322124A JP H10322124 A JPH10322124 A JP H10322124A JP 14455897 A JP14455897 A JP 14455897A JP 14455897 A JP14455897 A JP 14455897A JP H10322124 A JPH10322124 A JP H10322124A
- Authority
- JP
- Japan
- Prior art keywords
- plate
- antenna
- excitation
- conductor
- board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、携帯無線機器に備
えるに好適な低姿勢の広帯域特性を有する板状アンテナ
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-profile wideband plate antenna suitable for use in portable radio equipment.
【０００２】[0002]
【従来の技術】従来、携帯無線機器に備えられる低姿勢
のアンテナとして逆Ｆ型アンテナが知られている。逆Ｆ
型アンテナの例として、特開昭６１−２１０７０７号公
報に記載されている逆Ｆ型アンテナを図４に示す。この
逆Ｆ型アンテナは、金属製の無線機筐体５３に設けられ
ており、５１は給電素子、５２は励振板、５４は接地導
体、５５は金属製の板をコ字状に折り曲げた金属ブリッ
ジ部である。このように構成された逆Ｆ型アンテナにお
いて、給電素子５１を介して給電された電力は、励振板
５２と筐体５３の間に電波を励振する。この電波は励振
板５２のエッジ部分を通って空間に放射される。この場
合、励振板５２の大きさが波長に比べて小さくされてい
ると、接地導体５４は有効に逆Ｆ型アンテナの共振周波
数を下げる働きをする。2. Description of the Related Art Conventionally, an inverted-F type antenna has been known as a low-profile antenna provided in portable radio equipment. Reverse F
FIG. 4 shows an inverted-F type antenna described in Japanese Patent Application Laid-Open No. 61-210707 as an example of a type antenna. The inverted F-type antenna is provided in a radio transceiver case 53 made of metal, 51 is a feed element, 52 is an excitation plate, 54 is a ground conductor, and 55 is a metal obtained by bending a metal plate into a U-shape. Bridge section. In the inverted F-type antenna configured as described above, the power supplied via the power supply element 51 excites a radio wave between the excitation plate 52 and the housing 53. This radio wave is radiated into space through the edge of the excitation plate 52. In this case, if the size of the excitation plate 52 is smaller than the wavelength, the ground conductor 54 effectively functions to lower the resonance frequency of the inverted-F antenna.
【０００３】また、励振板５２と金属ブリッジ部５５と
の間の部分が等価的にキャパシタンスの働きをし、励振
板５２と筐体５３との間隔を狭めた際の入力インピーダ
ンス特性を向上することができるようになる。なお、金
属ブリッジ部５５に替えて金属ブロックとすることがで
きる。In addition, the portion between the excitation plate 52 and the metal bridge portion 55 functions equivalently as a capacitance, and the input impedance characteristic when the distance between the excitation plate 52 and the housing 53 is reduced is improved. Will be able to Note that a metal block can be used instead of the metal bridge portion 55.
【０００４】[0004]
【発明が解決しようとする課題】従来の一般的な逆Ｆ型
アンテナの８００ＭＨｚ帯における電圧定在波比（ＶＳ
ＷＲ）の周波数特性の一例を図３（ｂ）に示す。この図
に示すように、ＶＳＷＲが「２」以下とされた周波数帯
域ｆｂは、中心周波数の約８％であり、逆Ｆ型アンテナ
が動作する周波数帯域は狭帯域になってしまっていた。
このため、製作後に周波数特性等の調整を行う必要が生
じ、量産に適しにくいアンテナであるという問題点があ
った。また、給電素子５１とインピーダンス整合をとる
ように逆Ｆ型アンテナのインピーダンス調整を行う際に
は、給電素子５１が励振板５２に接続される給電位置の
変更や、接地導体５４の高さあるいは励振板５２への接
続位置を変更することが必要となる。さらに、使用周波
数帯域の中心周波数に共振するように逆Ｆ型アンテナの
動作周波数を調整する際には、励振板５２の周囲長の変
更や給電素子５１が励振板５２に接続される給電位置の
変更を行う必要がある。The voltage standing wave ratio (VSS) of the conventional general inverted F-type antenna in the 800 MHz band.
FIG. 3B shows an example of the frequency characteristic of WR). As shown in this figure, the frequency band fb in which the VSWR is equal to or less than “2” is about 8% of the center frequency, and the frequency band in which the inverted F-type antenna operates is narrow.
For this reason, it is necessary to adjust the frequency characteristics and the like after manufacturing, and there is a problem that the antenna is not suitable for mass production. Further, when performing impedance adjustment of the inverted F-type antenna so as to achieve impedance matching with the feed element 51, the feed position at which the feed element 51 is connected to the excitation plate 52 is changed, or the height of the ground conductor 54 or the excitation It is necessary to change the connection position to the plate 52. Further, when adjusting the operating frequency of the inverted-F type antenna so as to resonate with the center frequency of the operating frequency band, the peripheral length of the excitation plate 52 is changed or the feeding position of the feeding element 51 connected to the excitation plate 52 is changed. Changes need to be made.
【０００５】このように、従来の逆Ｆ型アンテナにおい
ては、量産に向かないと共に、インピーダンス調整や周
波数調整を行う作業が繁雑であり、その作業に長時間を
費やすという問題点があった。そこで、本発明は、広帯
域で動作可能であると共に、インピーダンス調整や周波
数調整を容易に行うことのできる量産性に優れた広帯域
板状アンテナを提供することを目的としている。As described above, the conventional inverted-F type antenna is not suitable for mass production, and has a problem that the operation of adjusting the impedance and the frequency is complicated, and the operation takes a long time. Therefore, an object of the present invention is to provide a broadband plate antenna that can operate in a wide band and that can easily perform impedance adjustment and frequency adjustment and has excellent mass productivity.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明の広帯域板状アンテナは、アース板と、該ア
ース板を貫通するよう配置された同軸状の給電ケーブル
と、該給電ケーブルの先端の芯線が端縁に接続されてい
ると共に、所定の周囲長とされた励振板と、該励振板よ
り小さな形状とされていると共に、該励振板と所定間隔
だけ隔てて対向配置されている導体板とからなり、前記
導体板の端縁に前記給電ケーブルの先端近傍のシールド
部が接続されていると共に、前記導体板が前記アース板
と対向配置されている。In order to achieve the above object, a broadband plate antenna according to the present invention comprises an earth plate, a coaxial feed cable arranged to penetrate the earth plate, and the feed cable. A core wire at the tip of the end plate is connected to the edge, an excitation plate having a predetermined peripheral length, and a shape smaller than the excitation plate, and is disposed facing the excitation plate at a predetermined interval. A shield portion near the tip of the power supply cable is connected to an edge of the conductor plate, and the conductor plate is arranged to face the ground plate.
【０００７】このような本発明によれば、広帯域板状ア
ンテナの動作可能な周波数帯域を中心周波数に対して約
１５％もの広帯域とすることができる。また、広帯域板
状アンテナのインピーダンス調整を、導体板の周囲長を
変更することにより調整することができると共に、広帯
域板状アンテナの動作周波数の調整を励振板の周囲長や
導体板の周囲長を変更することにより行うことができ
る。従って、給電位置の付け直しや接地導体の付け直し
等の繁雑な作業を行うことなく、インピーダンス調整お
よび周波数調整を容易に行うことができ、量産性に優れ
たアンテナとすることができる。According to the present invention, the frequency band in which the broadband plate antenna can operate can be made as wide as about 15% of the center frequency. In addition, the impedance adjustment of the broadband plate antenna can be adjusted by changing the perimeter of the conductor plate, and the operating frequency of the broadband plate antenna can be adjusted by adjusting the perimeter of the excitation plate and the perimeter of the conductor plate. It can be done by changing. Therefore, impedance adjustment and frequency adjustment can be easily performed without performing complicated operations such as re-adjustment of a feeding position and re-attachment of a ground conductor, and an antenna excellent in mass productivity can be obtained.
【０００８】[0008]
【発明の実施の形態】本発明の広帯域板状アンテナの実
施の形態の構成例における斜視図を図１に示す。図１に
おいて、１はグランドプレーンとされるアース板であ
り、広帯域板状アンテナが無線機に設置される際に、無
線機の筐体が金属製とされる場合には、この筐体がアー
ス板１を兼ねることができる。また、２は矩形状の励振
板であり、３は励振板２に対向するよう配置された矩形
状の導体板である。さらに、４は広帯域板状アンテナに
給電する同軸ケーブルとされた給電ケーブルであり、給
電ケーブル４の芯線４−１は励振板２の端縁に接続さ
れ、給電ケーブル４のシールド部とされる外被は導体板
３の端縁に接続されている。また、給電ケーブル４はア
ース板１を貫通するように設けられており、給電ケーブ
ル４の他端から信号源５により給電されている。FIG. 1 is a perspective view showing a configuration example of an embodiment of a broadband plate antenna according to the present invention. In FIG. 1, reference numeral 1 denotes an earth plate serving as a ground plane. When a wide-band plate antenna is installed in a wireless device and the case of the wireless device is made of metal, this case is grounded. The plate 1 can also function. Reference numeral 2 denotes a rectangular excitation plate, and reference numeral 3 denotes a rectangular conductor plate arranged to face the excitation plate 2. Further, reference numeral 4 denotes a power supply cable which is a coaxial cable for supplying power to the broadband plate antenna, and a core 4-1 of the power supply cable 4 is connected to an edge of the excitation plate 2 and serves as a shield part of the power supply cable 4. The cover is connected to the edge of the conductor plate 3. The power supply cable 4 is provided so as to penetrate the ground plate 1, and power is supplied from the other end of the power supply cable 4 by the signal source 5.
【０００９】また、図１に示す本発明の広帯域板状アン
テナの側面図を図２に示す。図２に示すように給電ケー
ブル４は、アース板１を貫通するようアース板１に植設
されており、この給電ケーブル４の上端部の外被に接続
された導体板３は、アース板１から所定間隔だけ離隔さ
れて配置されている。さらに、この導体板３の上には所
定間隔ｄだけ離隔されて励振板２が対向するよう配置さ
れている。なお、導体板３の大きさは励振板２より小さ
くされている。また、励振板２の端縁には給電ケーブル
４の芯線４−１が接続されている。このような構成によ
り、給電ケーブル４から給電された電力により、励振板
２と導体板３およびアース板１の間に磁流が流れるよう
になる。この磁流により励振された電磁波は、励振板２
の端縁部分を介して空間に放射されるようになる。すな
わち、アンテナとして動作するようになる。FIG. 2 is a side view of the broadband plate antenna of the present invention shown in FIG. As shown in FIG. 2, the power supply cable 4 is implanted in the ground plate 1 so as to penetrate the ground plate 1, and the conductor plate 3 connected to the jacket at the upper end of the power supply cable 4 is connected to the ground plate 1. Are spaced apart from each other by a predetermined distance. Further, the excitation plate 2 is arranged on the conductor plate 3 so as to face the excitation plate 2 at a predetermined interval d. The size of the conductor plate 3 is smaller than that of the excitation plate 2. A core wire 4-1 of the power supply cable 4 is connected to an edge of the excitation plate 2. With such a configuration, the power supplied from the power supply cable 4 causes a magnetic current to flow between the excitation plate 2, the conductor plate 3, and the ground plate 1. The electromagnetic wave excited by this magnetic current is applied to the excitation plate 2
Is radiated to the space through the edge portion of. That is, the antenna operates as an antenna.
【００１０】本発明の広帯域板状アンテナの特徴点は、
放射素子として動作しないように導体板３を励振板２よ
り小さくしていること、および、励振板２に導体板３を
狭い間隔ｄで対向させて、励振板２と導体板３との間に
大きな容量を生じさせていることである。なお、励振板
２と導体板３との間に容量を発生させるのは、広帯域板
状アンテナのインピーダンス調整を導体板３により行う
ためである。すなわち、導体板３の幅や長さを適切な寸
法に調整することにより、励振板２との間に発生する容
量が変化して広帯域板状アンテナのインピーダンス調整
を行うことができるようになる。これにより、広帯域板
状アンテナのインピーダンス整合を、導体板３の周囲
長、すなわち大きさを調整することにより行うことがで
きるようになる。したがって、従来の逆Ｆ型アンテナの
ように励振板への給電位置の付け直しや接地導体の接続
のし直しをすることなく、容易にインピーダンス調整を
行えるようになる。なお、作業工程が若干増加するが、
励振板２と導体板３との間隔ｄを調整することによって
もインピーダンス調整を行うことができる。The feature of the broadband plate antenna of the present invention is as follows.
The conductor plate 3 is made smaller than the excitation plate 2 so as not to operate as a radiating element, and the conductor plate 3 is opposed to the excitation plate 2 at a small interval d, so that the space between the excitation plate 2 and the conductor plate 3 is reduced. This is to cause a large capacity. The reason why the capacitance is generated between the excitation plate 2 and the conductor plate 3 is that the impedance of the broadband plate antenna is adjusted by the conductor plate 3. In other words, by adjusting the width and length of the conductor plate 3 to appropriate dimensions, the capacitance generated between the conductor plate 3 and the excitation plate 2 changes, and the impedance of the broadband plate antenna can be adjusted. Thus, impedance matching of the broadband plate antenna can be performed by adjusting the perimeter, that is, the size, of the conductor plate 3. Therefore, the impedance can be easily adjusted without re-adjusting the power supply position to the excitation plate or re-connecting the ground conductor as in the conventional inverted F-type antenna. Although the number of work steps increases slightly,
The impedance can also be adjusted by adjusting the distance d between the excitation plate 2 and the conductor plate 3.
【００１１】また、インピーダンス調整用の導体板３を
励振板２より小さくして、その下方に、かつ励振板２に
より覆われるように配置したことにより、導体板３によ
る放射パターンや利得への影響を極力少なくすることが
できる。また、動作中心周波数における波長に対する導
体板３の長辺の長さを有効長（例えば、１／４波長）と
することにより、周波数特性を持つようになり、導体板
３の長辺の長さを調整することにより、本発明の広帯域
板状アンテナの共振周波数の調整も行うことができる。
さらに、当然のことではあるが、本発明の広帯域板状ア
ンテナの共振周波数の調整を、励振板２の周囲長を調整
することにより行うことができる。このように、励振板
２あるいは導体板３の周囲長、すなわち大きさを調整す
ることにより、動作周波数の調整を行うことができるの
で、従来の逆Ｆ型アンテナにおけるような、励振導体に
おける給電位置の接続のし直しや接地導体の接続のし直
し等の繁雑な作業を行うことなく動作周波数の調整を行
うことができるようになる。In addition, since the conductor plate 3 for impedance adjustment is made smaller than the excitation plate 2 and disposed below and so as to be covered by the excitation plate 2, the influence of the conductor plate 3 on the radiation pattern and the gain is obtained. Can be reduced as much as possible. Further, by setting the length of the long side of the conductor plate 3 to the effective length (for example, と す る wavelength) with respect to the wavelength at the operating center frequency, the conductor plate 3 has a frequency characteristic and the length of the long side of the conductor plate 3 By adjusting the resonance frequency, the resonance frequency of the broadband plate antenna of the present invention can also be adjusted.
Furthermore, it goes without saying that the resonance frequency of the broadband plate antenna of the present invention can be adjusted by adjusting the peripheral length of the excitation plate 2. As described above, the operating frequency can be adjusted by adjusting the perimeter, that is, the size, of the excitation plate 2 or the conductor plate 3, so that the power supply position in the excitation conductor as in the conventional inverted F-type antenna can be adjusted. The operation frequency can be adjusted without performing complicated operations such as reconnection of the ground conductor and reconnection of the ground conductor.
【００１２】以上説明した本発明の広帯域板状アンテナ
においては、中心周波数に対して約１５％もの広帯域に
おいて動作するようになり、従来の逆Ｆ型アンテナの約
２倍とされる周波数帯域で動作するようになる。また、
本発明の広帯域板状アンテナにおける導体板３は、アー
ス板１に接続されないように設けられているが、導体板
３は逆Ｆ型アンテナにおける接地導体の役割を行ってい
るものと考えられる。さらに、本発明の広帯域板状アン
テナの高さは、従来の逆Ｆ型アンテナと同様であって、
本発明によれば低姿勢で広帯域な板状アンテナとするこ
とができる。さらに、放射パターンも従来の逆Ｆ型アン
テナとほぼ同等とすることができる。The above-described broadband plate antenna of the present invention operates in a wide band of about 15% with respect to the center frequency, and operates in a frequency band which is about twice that of the conventional inverted-F antenna. I will be. Also,
Although the conductor plate 3 in the broadband plate antenna of the present invention is provided so as not to be connected to the ground plate 1, it is considered that the conductor plate 3 serves as a ground conductor in the inverted-F antenna. Further, the height of the broadband plate antenna of the present invention is the same as that of the conventional inverted F type antenna,
ADVANTAGE OF THE INVENTION According to this invention, it can be set as a low-profile and wide-band plate antenna. Further, the radiation pattern can be made substantially equal to that of the conventional inverted-F antenna.
【００１３】次に、本発明の広帯域板状アンテナの８０
０ＭＨｚ帯における電圧定在波比（ＶＳＷＲ）の周波数
特性の一例を図３（ａ）に示す。図３（ａ）を参照する
と、本発明の広帯域板状アンテナのＶＳＷＲは、広い周
波数帯域にわたり良好とされている。この際のＶＳＷＲ
が「２」以下とされた周波数帯域ｆａは、中心周波数の
約１５％となり、きわめて広帯域となる。このため、製
作後に共振周波数の調整を行う必要はほとんどなく、量
産に適したアンテナとされる。また、共振周波数を調整
する場合においても、前述したように共振周波数の調整
作業は簡単であって、量産に適したアンテナであること
にかわりはない。Next, the wide band plate antenna 80 of the present invention will be described.
FIG. 3A shows an example of the frequency characteristic of the voltage standing wave ratio (VSWR) in the 0 MHz band. Referring to FIG. 3A, the VSWR of the broadband plate antenna of the present invention is considered to be good over a wide frequency band. VSWR at this time
Is about 2% or less, which is about 15% of the center frequency, which is an extremely wide band. For this reason, there is almost no need to adjust the resonance frequency after manufacturing, and the antenna is suitable for mass production. Also, when adjusting the resonance frequency, as described above, the operation of adjusting the resonance frequency is simple, and the antenna is still suitable for mass production.
【００１４】なお、以上の説明では、励振板２および導
体板３は矩形状としたが、本発明はこれに限らず、円
形、楕円形、多角形等のどのような形状としてもよい。
また、本発明の広帯域板状アンテナにおいては、給電点
および導体板の接続点を励振板２あるいは導体板３の端
縁とすることができるので、その接続も容易に行うこと
ができる。In the above description, the excitation plate 2 and the conductor plate 3 are rectangular, but the present invention is not limited to this, and may be any shape such as a circle, an ellipse, and a polygon.
Further, in the broadband plate antenna of the present invention, the connection point between the feed point and the conductor plate can be the edge of the excitation plate 2 or the conductor plate 3, so that the connection can be easily performed.
【００１５】[0015]
【発明の効果】本発明は以上のように構成されているの
で、広帯域板状アンテナの動作可能な周波数帯域を中心
周波数に対して約１５％もの広帯域とすることができ
る。また、広帯域板状アンテナのインピーダンス調整
を、導体板の大きさである周囲長を変更することにより
調整することができると共に、広帯域板状アンテナの動
作周波数の調整を励振板の周囲長や導体板の周囲長を変
更することにより行うことができる。従って、インピー
ダンス調整および周波数調整を容易に行うことができ、
量産性に優れたアンテナとすることができる。According to the present invention, the frequency band in which the broadband plate antenna can operate can be made as wide as about 15% of the center frequency. In addition, the impedance adjustment of the broadband plate antenna can be adjusted by changing the perimeter, which is the size of the conductor plate, and the operating frequency of the broadband plate antenna can be adjusted by adjusting the perimeter of the excitation plate and the conductor plate. By changing the perimeter of the Therefore, impedance adjustment and frequency adjustment can be easily performed,
An antenna excellent in mass productivity can be obtained.
【図１】本発明の広帯域板状アンテナの実施の形態の構
成例の斜視図である。FIG. 1 is a perspective view of a configuration example of an embodiment of a broadband plate antenna according to the present invention.
【図２】図１に示す本発明の広帯域板状アンテナの側面
図である。FIG. 2 is a side view of the broadband plate antenna of the present invention shown in FIG.
【図３】本発明の広帯域板状アンテナのＶＳＷＲの周波
数特性を示す図、および、従来の逆Ｆ型アンテナのＶＳ
ＷＲの周波数特性を示す図である。FIG. 3 is a diagram showing the VSWR frequency characteristics of the broadband plate antenna of the present invention, and the VS of the conventional inverted-F antenna.
It is a figure showing the frequency characteristic of WR.
【図４】従来の逆Ｆ型アンテナの一例を示す図である。FIG. 4 is a diagram illustrating an example of a conventional inverted-F antenna.
１ アース板 ２ 励振板 ３ 導体板 ４ 給電ケーブル ４−１ 芯線 ５ 信号源 ５１ 給電素子 ５２ 励振板 ５３ 筐体 ５４ 接地導体 ５５ 金属ブリッジ板 REFERENCE SIGNS LIST 1 ground plate 2 excitation plate 3 conductor plate 4 power supply cable 4-1 core wire 5 signal source 51 power supply element 52 excitation plate 53 housing 54 ground conductor 55 metal bridge plate
Claims (1)
ブルと、 該給電ケーブルの先端の芯線が端縁に接続されていると
共に、所定の周囲長とされた励振板と、 該励振板より小さな形状とされていると共に、該励振板
と所定間隔だけ隔てて対向配置されている導体板とから
なり、 前記導体板の端縁に前記給電ケーブルの先端近傍のシー
ルド部が接続されていると共に、前記導体板が前記アー
ス板と対向配置されていることを特徴とする広帯域板状
アンテナ。1. A grounding plate, a coaxial power supply cable arranged to penetrate the grounding plate, and a core wire at a tip end of the power supply cable connected to an edge and having a predetermined peripheral length. An excitation plate, and a conductor plate having a shape smaller than that of the excitation plate and being disposed opposite to the excitation plate at a predetermined distance, and near an end of the conductor plate near a tip of the power supply cable. A wide-band plate antenna, wherein a shield part is connected and the conductor plate is arranged to face the ground plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14455897A JP3779430B2 (en) | 1997-05-20 | 1997-05-20 | Broadband plate antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14455897A JP3779430B2 (en) | 1997-05-20 | 1997-05-20 | Broadband plate antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10322124A true JPH10322124A (en) | 1998-12-04 |
| JP3779430B2 JP3779430B2 (en) | 2006-05-31 |
Family
ID=15365066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14455897A Expired - Fee Related JP3779430B2 (en) | 1997-05-20 | 1997-05-20 | Broadband plate antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3779430B2 (en) |
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| JP3779430B2 (en) | 2006-05-31 |
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