JP2006287524A - Multi-frequency planar antenna - Google Patents

Multi-frequency planar antenna Download PDF

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JP2006287524A
JP2006287524A JP2005103661A JP2005103661A JP2006287524A JP 2006287524 A JP2006287524 A JP 2006287524A JP 2005103661 A JP2005103661 A JP 2005103661A JP 2005103661 A JP2005103661 A JP 2005103661A JP 2006287524 A JP2006287524 A JP 2006287524A
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radiating element
planar antenna
frequency
radio signal
wavelength
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Akira Takahashi
章 高橋
Hitoshi Sasaki
均 佐々木
Hiroshi Sugisawa
博 杉澤
Naoto Takahashi
直人 高橋
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NHK Spring Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-frequency planar antenna realizing a multi-frequency shared antenna with a simple configuration. <P>SOLUTION: The antenna is provided with: a planar first radiation element 14 having the size decided by the wavelength of a first radio signal to be radiated; and a planar second radiation element 15 arranged substantially in parallel to the first radiation element 14 via a dielectric, decided by the wavelength of a second radio signal to be radiated and smaller than the planar shape of the first radiation element 14. The substantial centers of the first and second radiation elements 14 and 15 are commonly connected by an internal conductor 17 of a feeder line 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、簡易な構成で多周波の信号を輻射することができる多周波平面アンテナに関するものである。   The present invention relates to a multi-frequency planar antenna that can radiate multi-frequency signals with a simple configuration.

従来から、マイクロストリップアンテナなどの平面アンテナは、小型軽量であることから車載用のアンテナとして用いられている。この平面アンテナは、UHF帯からマイクロ波帯に多用され、接地導体板に平行配置された矩形板あるいは円形板などが放射素子として機能する(特許文献1参照)。   Conventionally, planar antennas such as microstrip antennas have been used as in-vehicle antennas because of their small size and light weight. This planar antenna is frequently used from the UHF band to the microwave band, and a rectangular plate or a circular plate arranged in parallel to the ground conductor plate functions as a radiating element (see Patent Document 1).

特開2002−305409号公報JP 2002-305409 A

しかしながら、上述した特許文献1に記載された多周波共有平面アンテナ装置では、各放射導体に対してそれぞれ給電線を接続しており、構成が複雑であり、コストがかかるという問題点があった。   However, the multi-frequency shared planar antenna device described in Patent Document 1 described above has a problem in that a feeder line is connected to each radiation conductor, the configuration is complicated, and costs are increased.

この発明は、上記に鑑みてなされたものであって、簡易な構成で多周波共用のアンテナを実現することができる多周波平面アンテナを提供することを目的とする。   The present invention has been made in view of the above, and an object of the present invention is to provide a multi-frequency planar antenna capable of realizing a multi-frequency antenna with a simple configuration.

上述した課題を解決し、目的を達成するために、請求項1にかかる多周波平面アンテナは、放射すべき第1の無線信号の波長によって決定される大きさをもつ平板形状の第1放射素子と、誘電体を介して前記第1放射素子に略平行配置され、放射すべき第2の無線信号の波長によって決定され前記第1放射素子の平板形状よりも小さい平板形状の第2放射素子と、誘電体を介して前記第2放射素子に略平行配置された接地導体板と、を備え、前記第1放射素子および前記第2放射素子の略中央は、給電線の内部導体によって共通接続されることを特徴とする。   In order to solve the above-mentioned problems and achieve the object, a multi-frequency planar antenna according to claim 1 is a flat plate-shaped first radiating element having a size determined by the wavelength of the first radio signal to be radiated. And a second radiating element having a flat plate shape that is arranged substantially in parallel to the first radiating element via a dielectric and is smaller than the flat plate shape of the first radiating element, which is determined by the wavelength of the second radio signal to be radiated. A grounding conductor plate disposed substantially in parallel with the second radiating element via a dielectric, and substantially the center of the first radiating element and the second radiating element is commonly connected by an internal conductor of a feeder line. It is characterized by that.

また、請求項2にかかる多周波平面アンテナは、上記の発明において、誘電体を介して前記第2放射素子に平行配置されるとともに前記給電線の内部導体に共通接続され、第3の無線信号の波長によって決定される平板形状の第3放射素子をさらに設けたことを特徴とする。   According to a second aspect of the present invention, in the above invention, the multi-frequency planar antenna is arranged in parallel to the second radiating element via a dielectric, and is commonly connected to the inner conductor of the feeder line, and the third radio signal. A third radiating element having a flat plate shape determined by the wavelength of is further provided.

また、請求項3にかかる多周波平面アンテナは、上記の発明において、前記第1の無線信号と前記第2の無線信号との波長間隔あるいは前記第1〜第3の無線信号の各波長間隔を狭めて広帯域の反射特性を持たせたことを特徴とする。   According to a third aspect of the present invention, there is provided the multi-frequency planar antenna according to the above invention, wherein the wavelength interval between the first radio signal and the second radio signal or each wavelength interval between the first to third radio signals is determined. It is characterized by a narrow and wide band reflection characteristic.

また、請求項4にかかる多周波平面アンテナは、上記の発明において、前記第2放射素子あるいは前記第3放射素子と前記接地導体板との間の誘電体は、空気であることを特徴とする。   The multi-frequency planar antenna according to claim 4 is characterized in that, in the above invention, the dielectric between the second radiating element or the third radiating element and the ground conductor plate is air. .

この発明にかかる多周波平面アンテナでは、放射すべき第1の無線信号の波長によって決定される大きさをもつ平板形状の第1放射素子と、誘電体を介して前記第1放射素子に略平行配置され、放射すべき第2の無線信号の波長によって決定され前記第1放射素子の平板形状よりも小さい平板形状の第2放射素子とを備え、前記第1放射素子および前記第2放射素子の略中央が、給電線の内部導体によって共通接続されるようにしているので、
給電線およびこの内部導体の構成が容易になり、従来の多周波平面アンテナのアンテナ特性を維持しつつ、コストを低減することができるという効果を奏する。
In the multi-frequency planar antenna according to the present invention, a flat plate-shaped first radiating element having a size determined by the wavelength of the first radio signal to be radiated, and substantially parallel to the first radiating element via a dielectric. A second radiating element having a flat plate shape that is determined by the wavelength of the second radio signal to be radiated and is smaller than the flat plate shape of the first radiating element, the first radiating element and the second radiating element Since the approximate center is connected in common by the inner conductor of the feeder line,
The structure of the feeder line and the internal conductor becomes easy, and the cost can be reduced while maintaining the antenna characteristics of the conventional multi-frequency planar antenna.

以下、この発明を実施するための最良の形態である多周波平面アンテナについて説明する。   A multi-frequency planar antenna that is the best mode for carrying out the present invention will be described below.

(実施の形態)
図1は、この発明の実施の形態である多周波平面アンテナの断面図である。また、図2は、図1に示した多周波平面アンテナの平面図である。さらに、図3は、図1に示した多周波平面アンテナの斜視図である。図1〜図3において、この多周波平面アンテナ1は、接地導体板11上に平行配置された矩形板の天板12を有する。天板12の上面には銅で形成された矩形板の第1放射素子14が設けられるとともに、天板12の下面には銅で形成された矩形板の第2放射素子15が設けられ、第1放射素子14と第2放射素子15との間は、PPE(ポリフェニレンエーテル)樹脂や、ガラス繊維が入ったテフロンなどの誘電体によって形成されている。
(Embodiment)
FIG. 1 is a cross-sectional view of a multifrequency planar antenna according to an embodiment of the present invention. FIG. 2 is a plan view of the multi-frequency planar antenna shown in FIG. FIG. 3 is a perspective view of the multi-frequency planar antenna shown in FIG. 1 to 3, the multi-frequency planar antenna 1 includes a rectangular top plate 12 arranged in parallel on a ground conductor plate 11. A rectangular plate-shaped first radiating element 14 made of copper is provided on the top surface of the top plate 12, and a rectangular-shaped second radiating element 15 made of copper is provided on the bottom surface of the top plate 12. A space between the first radiating element 14 and the second radiating element 15 is formed by a dielectric such as PPE (polyphenylene ether) resin or Teflon containing glass fiber.

接地導体板11の貫通孔11aには、同軸ケーブルによって実現される給電線16が挿通され、外部導体18は、接地導体板11に接続されるとともに、内部導体17は、第2放射素子15の中央部分の貫通孔を介して導通接続されるとともに、その上部の第1放射素子14まで達して第2放射素子14に導通接続される。なお、貫通孔11aにコネクタを設け、このコネクタによって給電線16を固着するようにしてもよい。   A feed line 16 realized by a coaxial cable is inserted into the through hole 11 a of the ground conductor plate 11, the outer conductor 18 is connected to the ground conductor plate 11, and the inner conductor 17 is connected to the second radiating element 15. Conductive connection is made through the through hole in the central portion, and the first radiating element 14 at the upper part is reached and conductively connected to the second radiating element 14. A connector may be provided in the through hole 11a, and the power supply line 16 may be fixed by this connector.

第2放射素子15の隅と接地導体板11との間には整合帯21が接続され、さらに、天板12と接地導体板11との間の複数箇所には、誘電体で形成された保持部材24が設けられ、接地導体板11に対する天板の位置関係を保持するようにしている。この場合、天板12と接地導体板11との間には、誘電体としての空気が満たされるが、上述したPPE樹脂などの誘電体を満たすようにしてもよい。   A matching band 21 is connected between the corner of the second radiating element 15 and the ground conductor plate 11, and further, a holding formed of a dielectric at a plurality of locations between the top plate 12 and the ground conductor plate 11. A member 24 is provided to maintain the positional relationship of the top plate with respect to the ground conductor plate 11. In this case, the space between the top plate 12 and the ground conductor plate 11 is filled with air as a dielectric, but may be filled with a dielectric such as the PPE resin described above.

ここで、第1放射素子14は、第1の無線周波数、たとえば800MHz帯の無線信号を輻射できる矩形平板であり、第2放射素子15は、第2の無線周波数、たとえば2GHz帯の無線信号を輻射できる矩形平板である。この場合、第1放射素子14と第2放射素子15とは、1つの給電線16の内部導体17によってその中央部が共通接続されているので、1つの給電線16のみで多周波共用の平面アンテナを実現することができる。   Here, the first radiating element 14 is a rectangular flat plate capable of radiating a radio signal of a first radio frequency, for example, 800 MHz band, and the second radiating element 15 is a radio signal of a second radio frequency, for example, 2 GHz band. It is a rectangular flat plate that can radiate. In this case, since the central portion of the first radiating element 14 and the second radiating element 15 is commonly connected by the inner conductor 17 of one feed line 16, a multi-frequency shared plane is obtained by using only one feed line 16. An antenna can be realized.

また、図4に示すように、さらに第3放射素子31を多層化して設けることによって第3の無線周波数の無線信号を輻射することができる。同様にして、天板12に4つ以上の放射素子を多層化するようにしてもよい。   In addition, as shown in FIG. 4, a third radio frequency radio signal can be radiated by providing the third radiating element 31 in multiple layers. Similarly, four or more radiating elements may be multilayered on the top plate 12.

放射すべき各無線周波数を適切に近接させることによって、広帯域の反射特性をもたせる平面アンテナが実現され、その周波数帯をカバーできる利得を得ることができる。   By appropriately bringing the radio frequencies to be radiated close to each other, a planar antenna having a broadband reflection characteristic is realized, and a gain capable of covering the frequency band can be obtained.

もちろん、各無線周波数を十分に近くして設定することによって、各周波数の輻射を共用できる平面アンテナが実現される。   Of course, by setting each radio frequency close enough, a planar antenna that can share the radiation of each frequency is realized.

なお、図5および図6に示すように、整合帯21に替えて整合帯22を設けるようにしてもよい。この整合帯22は、補助放射素子15と接地導体板11との間の内部導体であるアンテナ部23の途中から接地導体板11に向けて金属部材が接地される。   As shown in FIGS. 5 and 6, a matching band 22 may be provided instead of the matching band 21. In the matching band 22, a metal member is grounded from the middle of the antenna portion 23 that is an internal conductor between the auxiliary radiating element 15 and the ground conductor plate 11 toward the ground conductor plate 11.

また、図7は、図1に示した2周波共用の多周波平面アンテナのリターンロスの周波数依存性を示す図である。図7に示すように、周波数f1,f2の2つの共振周波数近傍でリターンロスが−30dB程度まで小さくなり、従来の多周波平面アンテナと同様な反射特性を得ることができる。さらに、図8は、図4に示した3周波共用の多周波平面アンテナのリターンロスの周波数依存性を示す図である。図8に示すように、周波数f1,f2,f3の3つの共振周波数近傍でリターンロスが−30dB程度まで小さくなり、従来の多周波平面アンテナと同様な反射特性を得ることができる。   FIG. 7 is a diagram showing the frequency dependence of the return loss of the multi-frequency planar antenna for dual frequencies shown in FIG. As shown in FIG. 7, the return loss is reduced to about −30 dB in the vicinity of the two resonance frequencies of frequencies f1 and f2, and the same reflection characteristic as that of the conventional multi-frequency planar antenna can be obtained. Further, FIG. 8 is a diagram showing the frequency dependence of the return loss of the multi-frequency planar antenna for three frequencies shown in FIG. As shown in FIG. 8, the return loss is reduced to about −30 dB in the vicinity of the three resonance frequencies of frequencies f1, f2, and f3, and reflection characteristics similar to those of a conventional multifrequency planar antenna can be obtained.

この実施の形態では、1つの給電線16の内部導体17に各放射素子が共通接続されるので、多周波平面アンテナ自体の構成が簡易になり、従来のアンテナ特性を維持しつつ、コストを低減することができる。   In this embodiment, since each radiating element is commonly connected to the inner conductor 17 of one feeder line 16, the configuration of the multi-frequency planar antenna itself is simplified, and the cost is reduced while maintaining the conventional antenna characteristics. can do.

この発明の実施の形態である多周波平面アンテナの構成を示す断面図である。It is sectional drawing which shows the structure of the multifrequency planar antenna which is embodiment of this invention. 図1に示した多周波平面アンテナの平面図である。It is a top view of the multi-frequency planar antenna shown in FIG. 図1に示した多周波平面アンテナの斜視図である。It is a perspective view of the multifrequency planar antenna shown in FIG. この発明の実施の形態の変形例である多周波平面アンテナの構成を示す断面図である。It is sectional drawing which shows the structure of the multifrequency planar antenna which is a modification of embodiment of this invention. この発明の実施の形態の変形例である平面アンテナの構成を示す断面図である。It is sectional drawing which shows the structure of the planar antenna which is a modification of embodiment of this invention. この発明の実施の形態の変形例である平面アンテナの構成を示す平面図である。It is a top view which shows the structure of the planar antenna which is a modification of embodiment of this invention. 図1に示した2周波共用の多周波アンテナにおけるリターンロスの周波数依存性を示す図である。It is a figure which shows the frequency dependence of the return loss in the multi-frequency antenna for 2 frequencies shown in FIG. 図4に示した3周波共用の多周波アンテナにおけるリターンロスの周波数依存性を示す図である。It is a figure which shows the frequency dependence of the return loss in the multi-frequency antenna for 3 frequencies shown in FIG.

符号の説明Explanation of symbols

1,2 多周波平面アンテナ
11 接地導体板
12 天板
13 誘電体
14 第1放射素子
15 第2放射素子
16 給電線
16a 貫通孔
17 内部導体
18 外部導体
21,22 整合帯
23 アンテナ部
24 保持部材
31 第3放射素子
DESCRIPTION OF SYMBOLS 1, 2 Multi-frequency planar antenna 11 Grounding conductor plate 12 Top plate 13 Dielectric 14 First radiating element 15 Second radiating element 16 Feeding line 16a Through hole 17 Internal conductor 18 External conductor 21, 22 Matching band 23 Antenna portion 24 Holding member 31 Third radiating element

Claims (4)

放射すべき第1の無線信号の波長によって決定される大きさをもつ平板形状の第1放射素子と、
誘電体を介して前記第1放射素子に略平行配置され、放射すべき第2の無線信号の波長によって決定され前記第1放射素子の平板形状よりも小さい平板形状の第2放射素子と、
誘電体を介して前記第2放射素子に略平行配置された接地導体板と、
を備え、前記第1放射素子および前記第2放射素子の略中央は、給電線の内部導体によって共通接続されることを特徴とする多周波平面アンテナ。
A plate-shaped first radiating element having a size determined by the wavelength of the first radio signal to be radiated;
A plate-shaped second radiating element that is arranged substantially parallel to the first radiating element via a dielectric and is determined by the wavelength of the second radio signal to be radiated and is smaller than the plate shape of the first radiating element;
A ground conductor plate disposed substantially parallel to the second radiating element via a dielectric;
The multi-frequency planar antenna is characterized in that substantially the center of the first radiating element and the second radiating element is commonly connected by an internal conductor of a feeder line.
誘電体を介して前記第2放射素子に平行配置されるとともに前記給電線の内部導体に共通接続され、第3の無線信号の波長によって決定される平板形状の第3放射素子をさらに設けたことを特徴とする請求項1に記載の多周波平面アンテナ。   A flat plate-shaped third radiating element that is arranged in parallel to the second radiating element via a dielectric and is commonly connected to the inner conductor of the feeder line and determined by the wavelength of the third radio signal is further provided. The multi-frequency planar antenna according to claim 1. 前記第1の無線信号と前記第2の無線信号との波長間隔あるいは前記第1〜第3の無線信号の各波長間隔を狭めて広帯域の反射特性を持たせたことを特徴とする請求項1または2に記載の多周波平面アンテナ。   2. A wide band reflection characteristic is provided by narrowing a wavelength interval between the first radio signal and the second radio signal or each wavelength interval between the first to third radio signals. Or the multi-frequency planar antenna of 2. 前記第2放射素子あるいは前記第3放射素子と前記接地導体板との間の誘電体は、空気であることを特徴とする請求項1〜3のいずれか一つに記載の多周波平面アンテナ。   The multi-frequency planar antenna according to any one of claims 1 to 3, wherein the dielectric between the second radiating element or the third radiating element and the ground conductor plate is air.
JP2005103661A 2005-03-31 2005-03-31 Multi-frequency planar antenna Pending JP2006287524A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016503275A (en) * 2013-01-15 2016-02-01 タイコ・エレクトロニクス・コーポレイションTyco Electronics Corporation Patch antenna

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016503275A (en) * 2013-01-15 2016-02-01 タイコ・エレクトロニクス・コーポレイションTyco Electronics Corporation Patch antenna

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