JPH035088B2 - - Google Patents
Info
- Publication number
- JPH035088B2 JPH035088B2 JP60271980A JP27198085A JPH035088B2 JP H035088 B2 JPH035088 B2 JP H035088B2 JP 60271980 A JP60271980 A JP 60271980A JP 27198085 A JP27198085 A JP 27198085A JP H035088 B2 JPH035088 B2 JP H035088B2
- Authority
- JP
- Japan
- Prior art keywords
- conductor plate
- antenna
- parasitic element
- smsa
- radiation conductor
- 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.)
- Expired - Lifetime
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- Aerials With Secondary Devices (AREA)
- Waveguide Aerials (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は主に移動通信に使用される移動体に搭
載するため、広帯域な低姿勢構造のアンテナに関
する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a broadband antenna with a low profile structure for being mounted on a mobile body mainly used for mobile communication.
（従来の技術）
第３図に示す片側短絡形マイクロストリツプア
ンテナ（以後、SMSAと称する。）は、小形、軽
量で低姿勢であるという特徴を有し、通常のパツ
チアンテナを1/2に小形化したアンテナである。
そのため、斯かるアンテナは移動通信に使用され
る移動体に搭載されるアンテナとして望ましい構
造を有している。(Prior art) The short-circuited microstrip antenna (hereinafter referred to as SMSA) shown in Fig. 3 has the characteristics of being small, lightweight, and low-profile, and is half the size of a normal patch antenna. This is a miniaturized antenna.
Therefore, such an antenna has a desirable structure as an antenna mounted on a mobile body used for mobile communication.
この種のアンテナでは通常、アンテナの厚さｔ
をｔ≪λ0（λ0：中心周波数における自由空間波長）
として用いる。このため、例えば放射導体板２の
幅Ｗを約λ0／２、放射導体板２と接地導体板１に
挿まれた誘電体の比誘電率εrを１（なわち、空
気）、ｔを約λ0／30としてSMSAの比帯域幅を求
めてみると、VSWR＝1.5の場合に評価して５％
前後である。 This type of antenna typically has an antenna thickness t
t≪λ 0 (λ 0 : free space wavelength at center frequency)
used as For this reason, for example, the width W of the radiation conductor plate 2 is approximately λ 0 /2, the relative permittivity ε r of the dielectric inserted between the radiation conductor plate 2 and the ground conductor plate 1 is 1 (that is, air), and t is When determining the SMSA fractional bandwidth as approximately λ 0 /30, it is estimated to be 5% when VSWR = 1.5.
Before and after.
比誘電率εrの大きい誘電体を備えたSMSAはさ
らに比帯域幅が狭くなる。このように、斯かるア
ンテナは比較的狭帯域である。 An SMSA equipped with a dielectric material having a large relative permittivity ε r has a narrower relative bandwidth. As such, such antennas are relatively narrow band.
そこで、広帯域化する一つの方法として第４図
に示すように、第１の放射導体板２の上に第２の
放射導体板３を追加する方法が公知である。第４
図において、給電は給電ピン６により第１の放射
導体板２に対して行われる。第２の放射導体板３
は給電されないため、第２の放射導体板３は無給
電素子と呼ばれる。そこで、以後、第１の放射導
体板２を放射導体板、第２の放射導体板を無給電
素子と呼ぶ。なお、無給電素子３と放射導体板２
とは接地導体板４によつて接地導体板１に接続さ
れている。 Therefore, one known method for widening the band is to add a second radiating conductor plate 3 on top of the first radiating conductor plate 2, as shown in FIG. Fourth
In the figure, power is supplied to the first radiation conductor plate 2 through a power supply pin 6. Second radiation conductor plate 3
is not supplied with power, so the second radiation conductor plate 3 is called a parasitic element. Therefore, hereinafter, the first radiation conductor plate 2 will be referred to as a radiation conductor plate, and the second radiation conductor plate will be referred to as a parasitic element. In addition, the parasitic element 3 and the radiation conductor plate 2
is connected to the ground conductor plate 1 by the ground conductor plate 4.
このような無給電素子３を有するSMSAでは、
無給電素子３の寸法、ならびに無給電素子３と放
射導体板２との間隔t2を適当な値に設定すること
により、第３図に示すような構造を有する
SMSAに比較し、比帯域幅を数倍に拡大するこ
とができる。 In an SMSA having such a parasitic element 3,
By setting the dimensions of the parasitic element 3 and the distance t2 between the parasitic element 3 and the radiation conductor plate 2 to appropriate values, a structure as shown in Fig. 3 is obtained.
Compared to SMSA, the specific bandwidth can be expanded several times.
第５図はアンテナの厚さ（t1＋t2）を低く抑え
るために、無給電素子３と放射導体板２とを接近
させて構成した無給電素子付きSMSAと、無給
電素子が装着されていないSMSAとでインピー
ダンス特性の実測値を比較したものである。第５
図で曲線ａは前者、曲線ｂは後者のインピーダン
ス特性を表わす。 Figure 5 shows an SMSA with a parasitic element in which the parasitic element 3 and the radiation conductor plate 2 are placed close together in order to keep the antenna thickness (t 1 + t 2 ) low, and an SMSA with a parasitic element attached. This is a comparison of the measured values of impedance characteristics with SMSA and without. Fifth
In the figure, curve a represents the former impedance characteristic, and curve b represents the latter impedance characteristic.
（発明が解決しようとする問題点）
上述したように、無給電素子の効果により無給
電素子付きSMSAが比較的定インピーダンス特
性を示していることがわかる。しかし、そのイン
ピーダンスはリアクタンス分を有し、50Ω系との
整合はあまりよくない。また、このアンテナの整
合は給電位置を変更しても改善できない。(Problems to be Solved by the Invention) As described above, it can be seen that the SMSA with a parasitic element exhibits relatively constant impedance characteristics due to the effect of the parasitic element. However, its impedance has a reactance component, and matching with a 50Ω system is not very good. Furthermore, the matching of this antenna cannot be improved by changing the feeding position.
このように、無給電素子と放射導体板とを接近
させて薄形化した無給電素子付きSMSAでは、
定インピーダンス性を示しても50Ω系との良好な
整合がとれない場合があるという欠点がある。 In this way, in an SMSA with a parasitic element that is made thinner by bringing the parasitic element and the radiation conductor plate closer together,
Even if it exhibits constant impedance properties, it has the disadvantage that it may not be able to achieve good matching with a 50Ω system.
本発明の目的は、無給電素子と放射導体板とを
接近させ、無給電素子付きSMSAの放射導体板
の下部であつて、接地導体板上の所定の位置に放
射導体板の側に突出する導電性突出部を設けるこ
とによつて上記欠点を除去し、インピーダンス整
合特性を改善できるように構成したアンテナを提
供することにある。 An object of the present invention is to bring a parasitic element and a radiation conductor plate close to each other, and to protrude to the side of the radiation conductor plate at a predetermined position on the ground conductor plate at the lower part of the radiation conductor plate of an SMSA with a parasitic element. The object of the present invention is to provide an antenna configured to eliminate the above drawbacks and improve impedance matching characteristics by providing a conductive protrusion.
（問題点を解決するための手段）
本発明によるアンテナは給電された第１の放射
導体板と、第１の放射導体板に対向して第１の放
射導体板を挿むように配置した接地導体板ならび
に第２放射導体板と、第１および第２の放射導体
板を接地導体板に接続するための接続導体板と、
接地導体板に接続されていて第１の放射導体板の
側に突出する導電性の突出部とを具備して構成し
たものである。(Means for Solving the Problems) An antenna according to the present invention includes a first radiating conductor plate fed with power, and a grounding conductor plate arranged so as to face the first radiating conductor plate and inserting the first radiating conductor plate. and a second radiation conductor plate, and a connection conductor plate for connecting the first and second radiation conductor plates to a ground conductor plate,
A conductive protrusion connected to the ground conductor plate and protruding toward the first radiation conductor plate.
（実施例）
次に、本発明について図面を参照して説明す
る。(Example) Next, the present invention will be described with reference to the drawings.
第１図は、本発明によるアンテナの一実施例を
示す概略図である。第１図において１〜４，６は
それぞれ第３図における要素と同様のものであ
り、１は接地導体板、２は放射導体板、３は無給
電素子、４は接続導体板、６は給電ピンである。
また、５は導電性突出部、７は給電線に接続する
ためのコネクタである。 FIG. 1 is a schematic diagram showing an embodiment of an antenna according to the present invention. In Fig. 1, 1 to 4 and 6 are the same elements as in Fig. 3. 1 is a grounding conductor plate, 2 is a radiation conductor plate, 3 is a parasitic element, 4 is a connecting conductor plate, and 6 is a feeding conductor plate. It's a pin.
Further, 5 is a conductive protrusion, and 7 is a connector for connecting to a power supply line.
第１図に示すアンテナでは放射導体板２、無給
電素子３、およびそれらの間隔を所定の寸法に設
計し、導電性突出部５の大きさ、ならびに位置を
適当に選ぶことにより50Ω系に対して整合がよく
とれた広帯域アンテナを実現することができる。 In the antenna shown in Fig. 1, the radiation conductor plate 2, the parasitic element 3, and the spacing between them are designed to have predetermined dimensions, and the size and position of the conductive protrusion 5 are appropriately selected. It is possible to realize a broadband antenna with good matching.
第２図は本発明のアンテナの反射損特性ａと、
従来の無給電素子付きSMSAの反射損特性ｂと
を比較して示している。従来のアンテナでは−
14dB（VSWR＝1.5）以下の反射電力はほとんど
得られていないが、本発明のアンテナでは約16％
というきわめて広い比帯域幅にわたつて反射電力
が−14dB以下となつている。このようにして本
発明により広帯域にわたつて50Ω系との整合性の
よいアンテナが実現できる。すなわち、導電性突
出部５が広帯域にわたつて定リアクタンス性を有
するインピーダンス補正素子として動作している
ため、無給電素子３を取付けたことによつて得ら
れる定インピーダンス性をくずさずにリアクタン
ス分の補正ができるわけである。 FIG. 2 shows the reflection loss characteristics a of the antenna of the present invention,
A comparison of the reflection loss characteristics b of a conventional SMSA with a parasitic element is shown. With conventional antennas -
Reflected power of less than 14 dB (VSWR = 1.5) is hardly obtained, but with the antenna of the present invention, it is about 16%.
The reflected power is less than -14 dB over an extremely wide fractional bandwidth. In this way, according to the present invention, an antenna with good matching with a 50Ω system over a wide band can be realized. In other words, since the conductive protrusion 5 operates as an impedance correction element having constant reactance over a wide band, the reactance can be compensated for without destroying the constant impedance obtained by attaching the parasitic element 3. This means that corrections can be made.
本実施例では導電性突出部５の形状と直方体と
しているが、これは円柱等の他の形状でも同様な
特性が得られる。 In this embodiment, the shape of the conductive protrusion 5 is a rectangular parallelepiped, but similar characteristics can be obtained with other shapes such as a cylinder.
（発明の効果）
以上説明したように本発明は、無給電素子付き
SMSAにおいて放射導体板に対向する接地導体
板上に導電性突出部を設けることによつて、定イ
ンピーダンス性を示す無給電素子付きSMSAの
給電線との整合を改善させることができ、これに
より低姿勢構造の広帯域アンテナが実現できると
いう効果がある。(Effect of the invention) As explained above, the present invention provides a
By providing a conductive protrusion on the ground conductor plate opposite to the radiation conductor plate in the SMSA, it is possible to improve the matching with the feeder line of the SMSA with a parasitic element that exhibits constant impedance. This has the effect of realizing a broadband antenna with a posture structure.
第１図は、本発明によるアンテナ（SMSA）
の一実施例を示す概略図である。第２図は、本発
明によるアンテナ（SMSA）を従来の無給電素
子付きSMSAと比較した反射損特性を示す説明
図である。第３図〜第５図は、従来技術による
SMSAの構造と動作を示す説明図である。
１……接地導体板、２……放射導体板、３……
無給電素子、４……接続導体板、５……導電性突
出部、６……給電ピン、７……コネクタ。
Figure 1 shows an antenna (SMSA) according to the present invention.
FIG. 2 is a schematic diagram showing an embodiment of the invention. FIG. 2 is an explanatory diagram showing reflection loss characteristics comparing the antenna (SMSA) according to the present invention with a conventional SMSA with a parasitic element. Figures 3 to 5 are based on conventional technology.
FIG. 2 is an explanatory diagram showing the structure and operation of SMSA. 1... Ground conductor plate, 2... Radiation conductor plate, 3...
Parasitic element, 4... Connection conductor plate, 5... Conductive protrusion, 6... Power supply pin, 7... Connector.
Claims (1)
放射導体板に対向して前記第１の放射導体板を挿
むように配置した接地導体板ならびに第２の放射
導体板と、前記第１および第２の放射導体板を前
記接地導体板に接続するための接地導体板と、前
記接地導体板に接続されていて前記第１の放射導
体板の側に突出する導電性の突出部とを具備して
構成したことを特徴とする片側短絡形マイクロス
トリツプアンテナ。1. A first radiating conductor plate supplied with power, a grounding conductor plate and a second radiating conductor plate arranged so as to face the first radiating conductor plate and inserting the first radiating conductor plate, and the first radiating conductor plate. and a ground conductor plate for connecting a second radiation conductor plate to the ground conductor plate, and a conductive protrusion connected to the ground conductor plate and protruding toward the first radiation conductor plate. What is claimed is: 1. A short-circuited microstrip antenna on one side.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27198085A JPS62131610A (en) | 1985-12-03 | 1985-12-03 | Antenna |
| CA000524313A CA1263745A (en) | 1985-12-03 | 1986-12-02 | Shorted microstrip antenna |
| AU66037/86A AU589081B2 (en) | 1985-12-03 | 1986-12-03 | Shorted microstrip antenna with multiple ground planes |
| US06/937,495 US4791423A (en) | 1985-12-03 | 1986-12-03 | Shorted microstrip antenna with multiple ground planes |
| DE86309412T DE3688588T2 (en) | 1985-12-03 | 1986-12-03 | Shortened stripline antenna. |
| EP86309412A EP0226390B1 (en) | 1985-12-03 | 1986-12-03 | Shorted microstrip antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27198085A JPS62131610A (en) | 1985-12-03 | 1985-12-03 | Antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62131610A JPS62131610A (en) | 1987-06-13 |
| JPH035088B2 true JPH035088B2 (en) | 1991-01-24 |
Family
ID=17507471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27198085A Granted JPS62131610A (en) | 1985-12-03 | 1985-12-03 | Antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62131610A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0720711U (en) * | 1993-09-17 | 1995-04-11 | 日本無線株式会社 | Planar antenna |
| JP5024826B2 (en) * | 2006-08-24 | 2012-09-12 | 株式会社日立国際電気 | Antenna device |
| WO2008023800A1 (en) | 2006-08-24 | 2008-02-28 | Hitachi Kokusai Electric Inc. | Antenna device |
| WO2023190285A1 (en) * | 2022-03-29 | 2023-10-05 | 京セラ株式会社 | Antenna element, antenna substrate, and antenna module |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6058704A (en) * | 1983-09-09 | 1985-04-04 | Nippon Telegr & Teleph Corp <Ntt> | Double resonance type inverted-f antenna |
-
1985
- 1985-12-03 JP JP27198085A patent/JPS62131610A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62131610A (en) | 1987-06-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |