JP2002261537A - Helical composite antenna structure - Google Patents
Helical composite antenna structureInfo
- Publication number
- JP2002261537A JP2002261537A JP2001052378A JP2001052378A JP2002261537A JP 2002261537 A JP2002261537 A JP 2002261537A JP 2001052378 A JP2001052378 A JP 2001052378A JP 2001052378 A JP2001052378 A JP 2001052378A JP 2002261537 A JP2002261537 A JP 2002261537A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- helical
- cylindrical member
- monopole antenna
- ribs
- 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.)
- Granted
Links
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、人工衛星からの電
波（以下「衛星波」とも呼ぶ。）又は地上での電波（以
下「地上波」とも呼ぶ。）を受信してデジタルラジオ放
送を聴取することが可能なデジタルラジオ受信機に関
し、特に、デジタルラジオ受信機に用いられるヘリカル
複合アンテナに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention receives digital radio broadcasts by receiving radio waves from artificial satellites (hereinafter also referred to as "satellite waves") or radio waves on the ground (hereinafter also referred to as "terrestrial waves"). And, more particularly, to a helical composite antenna used in a digital radio receiver.
【０００２】[0002]
【従来の技術】最近、衛星波又は地上波を受信して、デ
ジタルラジオ放送を聴取可能にしたデジタルラジオ受信
機が開発され、米国において実用化されようとしてい
る。このデジタルラジオ受信機は、自動車等の移動局に
搭載され、周波数が約２．３ＧＨｚの電波を受信してラ
ジオ放送を聴取することが可能である。すなわち、デジ
タルラジオ受信機は、モバイル放送を聴取することが可
能なラジオ受信機である。なお、地上波は、衛星波を一
旦、地球局で受信した後、周波数を若干シフトしたもの
である。2. Description of the Related Art Recently, a digital radio receiver capable of receiving a satellite wave or a terrestrial wave so as to listen to a digital radio broadcast has been developed and is being put to practical use in the United States. This digital radio receiver is mounted on a mobile station such as an automobile, and is capable of receiving radio waves having a frequency of about 2.3 GHz and listening to radio broadcasts. That is, the digital radio receiver is a radio receiver that can listen to mobile broadcasts. The terrestrial wave is obtained by temporarily receiving a satellite wave at an earth station and then slightly shifting the frequency.
【０００３】このような、約２．３ＧＨｚの周波数の電
波を受信するためには、自動車の車外にアンテナを設置
する必要がある。そのようなアンテナとしては、種々の
構造のものが考えられるが、平面型（平板型）ではなく
スティック型とすることが一般的である。また、周知の
ように、自由空間に放射される電磁波は、波の進行方向
と直角な面内に振動する電界と磁界をもった横波で、電
界と磁界はその面内で強さが変化するが、これを偏波と
いう。衛星波は円偏波であるのに対して、地上波は直線
偏波である。したがって、衛星波と地上波との両方を受
信するためには、それぞれ、それ専用のアンテナが必要
となる。[0003] In order to receive such a radio wave having a frequency of about 2.3 GHz, it is necessary to install an antenna outside the vehicle. As such an antenna, various antennas are conceivable, but a stick type is generally used instead of a flat type (flat type). Also, as is well known, an electromagnetic wave radiated in free space is a transverse wave having an electric field and a magnetic field oscillating in a plane perpendicular to the traveling direction of the wave, and the electric field and the magnetic field vary in intensity in the plane. However, this is called polarization. Satellite waves are circularly polarized waves, whereas terrestrial waves are linearly polarized waves. Therefore, in order to receive both the satellite wave and the terrestrial wave, a dedicated antenna is required for each.
【０００４】以下では、衛星波を受信するためのアンテ
ナについて主に説明する。スティック型アンテナの１つ
として、ヘリカルアンテナが知られている。ヘリカルア
ンテナは、円筒状部材の周りに複数本の導線をヘリック
ス状（螺旋状）に巻いた構造であり、上述した円偏波を
効率高く受信することができる。円筒状部材の材料とし
てはプラスチックなどの絶縁材料が使用される。また、
導線の本数としては、例えば、４本が使用される。一
方、円筒状部材に複数本の導線をヘリックス状に巻くの
は実際には著しく困難である。したがって、その代り
に、絶縁シートに複数本の導体パターンを印刷して構成
されるアンテナパターンフィルムを、円筒状部材に巻き
付けるようにしたヘリカルアンテナが提案されている。Hereinafter, an antenna for receiving a satellite wave will be mainly described. A helical antenna is known as one of the stick antennas. The helical antenna has a structure in which a plurality of conductive wires are wound around a cylindrical member in a helical shape (spiral shape), and can efficiently receive the above-described circularly polarized waves. As a material of the cylindrical member, an insulating material such as plastic is used. Also,
As the number of conductive wires, for example, four wires are used. On the other hand, it is actually extremely difficult to wind a plurality of conducting wires around a cylindrical member in a helical manner. Therefore, instead, a helical antenna has been proposed in which an antenna pattern film formed by printing a plurality of conductor patterns on an insulating sheet is wound around a cylindrical member.
【０００５】さらに、上記対象製品として、前記円偏波
受信用アンテナ（以下、ヘリカルアンテナと呼ぶ。）と
前記直線偏波受信用アンテナ（以下、モノポールアンテ
ナと呼ぶ。）を搭載したヘリカル複合アンテナも提案さ
れている。図２にそのような複合アンテナの構造を示
す。図２に示すように、円筒状部材１２は通信機筐体１
１内の支持部材（図示せず）に支持されている。絶縁シ
ートに複数本の導体パターン１６がヘリックス状に印刷
されて構成される導体パターン付き絶縁フィルムが円筒
状部材１２の外周面上に巻き付けられて固定されてい
る。モノポールアンテナ１３と円筒状部材１２の内周面
の間にヘリカルアンテナを支持するための中空のヘリカ
ルアンテナホルダ１４を設けている。このヘリカルアン
テナホルダ１４の中空部にモノポールアンテナ１３が立
っている。Further, as the target product, a helical composite antenna equipped with the circularly polarized wave receiving antenna (hereinafter, referred to as a helical antenna) and the linearly polarized wave receiving antenna (hereinafter, referred to as a monopole antenna). Has also been proposed. FIG. 2 shows the structure of such a composite antenna. As shown in FIG. 2, the cylindrical member 12 is
1 is supported by a support member (not shown). An insulating film with a conductor pattern formed by printing a plurality of conductor patterns 16 on an insulating sheet in a helical manner is wound around the outer peripheral surface of the cylindrical member 12 and fixed. A hollow helical antenna holder 14 for supporting the helical antenna is provided between the monopole antenna 13 and the inner peripheral surface of the cylindrical member 12. The monopole antenna 13 stands in the hollow part of the helical antenna holder 14.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記し
た構造ではモノポールアンテナの位置の偏りにより不安
定な指向特性となってしまうので、モノポールアンテナ
を支持する支持部材が別途必要となり、構造の複雑化、
部品点数の増加等の問題が生じる。However, in the above structure, the directional characteristic becomes unstable due to the bias of the position of the monopole antenna. Therefore, a support member for supporting the monopole antenna is separately required, and the structure becomes complicated. ,
Problems such as an increase in the number of parts occur.
【０００７】そこで、本発明の目的は、このようなヘリ
カル複合アンテナの筒状部材を改造して、安定な指向特
性が得られ、構造の簡素化、部品点数の減少を図ること
ができるヘリカル複合アンテナを提供することである。Accordingly, an object of the present invention is to improve the cylindrical member of such a helical composite antenna to obtain a stable directional characteristic, to simplify the structure, and to reduce the number of parts. Is to provide an antenna.
【０００８】[0008]
【課題を解決するための手段】本発明によれば、筒状部
材の周囲に導体パターン付き円偏波用絶縁フィルムを券
回されてなるヘリカルアンテナと、該ヘリカルアンテナ
内にその中心軸に沿って設けられたモノポールアンテナ
から構成されるヘリカル複合アンテナにおいて、前記モ
ノポールアンテナを支持するための中空部を有する中心
軸と、該中心軸と前記筒状部材の内周面との間に放射状
に形成された少なくとも３本のリブとからなるモノポー
ルアンテナホルダーが、前記筒状部材と一体成形された
ことを特徴とするヘリカル複合アンテナ構造が得られ
る。According to the present invention, there is provided a helical antenna in which a circularly polarized insulating film with a conductor pattern is wound around a cylindrical member, and the helical antenna is provided inside the helical antenna along a central axis thereof. A helical composite antenna composed of a monopole antenna provided with a central axis having a hollow portion for supporting the monopole antenna and a radial axis between the central axis and the inner peripheral surface of the cylindrical member. The helical composite antenna structure is characterized in that a monopole antenna holder comprising at least three ribs formed in the above is integrally formed with the cylindrical member.
【０００９】[0009]
【発明の実施の形態】本発明の一実施の形態例のヘリカ
ル複合アンテナ構造について図１を参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A helical composite antenna structure according to an embodiment of the present invention will be described with reference to FIG.
【００１０】図１（ａ）は本実施の形態におけるヘリカ
ル複合アンテナの側面図であり、図１（ｂ）は図１
（ａ）のＡ−Ａ′断面図である。尚、本実施の形態では
円筒状部材１の外周面に巻き付けられる導体パターン付
き絶縁フィルムを省略する。FIG. 1A is a side view of a helical composite antenna according to the present embodiment, and FIG.
It is AA 'sectional drawing of (a). In the present embodiment, the insulating film with the conductor pattern wound around the outer peripheral surface of the cylindrical member 1 is omitted.
【００１１】図１（ｂ）に示すように、円筒状部材１
は、中空の中心軸３と４本のリブ２とを樹脂等、例えば
プラスチックで一体成形する。４本のリブ２は、中心軸
３の周囲に向かって十字状に形成され、中心軸３と円筒
状部材１の内周面との間を連結する。中心軸３と各リブ
２とは、円筒状部材１のモノポールアンテナ４近傍に少
なくとも一ヶ所部分的に形成されている。ここで、モノ
ポールアンテナ４は中心軸３の中空部を通って立ってい
る。本発明の特徴はこのようにモノポールアンテナ４を
支持するホルダーとして機能する中心軸３とヘリカルア
ンテナを支持する機能を有するボビンとしての円筒状部
材１とを一体成形したことである。As shown in FIG. 1B, the cylindrical member 1
Is formed by integrally molding a hollow central shaft 3 and four ribs 2 with a resin or the like, for example, a plastic. The four ribs 2 are formed in a cross shape around the central axis 3, and connect the central axis 3 and the inner peripheral surface of the cylindrical member 1. The central axis 3 and each of the ribs 2 are formed at least partially in the vicinity of the monopole antenna 4 of the cylindrical member 1. Here, the monopole antenna 4 stands through the hollow portion of the central shaft 3. The feature of the present invention is that the central shaft 3 functioning as a holder for supporting the monopole antenna 4 and the cylindrical member 1 as a bobbin having a function for supporting the helical antenna are integrally formed.
【００１２】強度の保持、重量の制約、材料費の節減及
び成形の容易性を勘案すると、円筒状部材１の寸法は、
内径１４〜１５ｍｍ程度が適切である。Taking into account strength retention, weight restrictions, material cost savings and ease of molding, the dimensions of the cylindrical member 1 are:
An inside diameter of about 14 to 15 mm is appropriate.
【００１３】リブ２の本数は、本実施の形態例では４本
であるが、円筒状部材１の所要の強度に応じて３本以上
を適宜に選択する。また、リブ２を中心軸３の周囲に対
称に放射状に形成すると、円筒状部材１の強度が向上
し、更に、成形を容易に行うことができる。更に、中心
軸３と各リブ２とを、本実施の形態例では、円筒状部材
１のモノポールアンテナ４近傍に一ヶ所部分的に形成し
た。尚、リブ２と中心軸３の形成箇所は少なくとも一ヶ
所部分的に形成すればよく、例えばモノポールアンテナ
４近傍に複数箇所設けても良い。又、円筒状部材１の一
端から他端までの全長にわたって形成するように設計変
更することができる。この場合には少なくとも一ヶ所部
分的に形成するときよりも誦しでの押し出し成形はより
容易になり、製造の簡素化を図ることができる。Although the number of ribs 2 is four in the present embodiment, three or more ribs are appropriately selected according to the required strength of the cylindrical member 1. Further, when the ribs 2 are formed symmetrically and radially around the central axis 3, the strength of the cylindrical member 1 is improved, and the molding can be easily performed. Further, in the present embodiment, the central axis 3 and the respective ribs 2 are partially formed near the monopole antenna 4 of the cylindrical member 1. The rib 2 and the central axis 3 may be formed at least partially at one location, for example, at a plurality of locations near the monopole antenna 4. Further, the design can be changed so as to be formed over the entire length from one end to the other end of the cylindrical member 1. In this case, extrusion molding by recitation is easier than when at least one portion is partially formed, and the production can be simplified.
【００１４】さらに、円筒状部材１は、所望の誘電率が
得られるならば、円筒状に限らず、多角形の角筒状であ
ってもよいし、空気を誘電体の一部として用いる円筒ま
たは角筒状であってもよい。Further, the cylindrical member 1 is not limited to a cylindrical shape as long as a desired dielectric constant can be obtained, and may be a polygonal rectangular tube, or a cylinder using air as a part of the dielectric. Alternatively, it may be in the shape of a rectangular tube.
【００１５】[0015]
【発明の効果】以上の説明から明らかなように、本発明
によれば、筒状部材の中心軸とその内周面との間に少な
くとも３本のリブを放射状に形成し、モノポールアンテ
ナを支持するホルダーとして機能する中心軸とヘリカル
アンテナを支持する機能を有するボビンとしての円筒状
部材とを一体成形したので、安定な指向特性が得られ、
構造の簡素化、部品点数の減少を図ることができるAs is apparent from the above description, according to the present invention, at least three ribs are formed radially between the central axis of the cylindrical member and the inner peripheral surface thereof, and the monopole antenna is formed. Since the central axis functioning as a holder to support and the cylindrical member as a bobbin having a function to support the helical antenna are integrally molded, stable directional characteristics are obtained,
The structure can be simplified and the number of parts can be reduced.
【図１】本発明の一実施の形態におけるヘリカル複合ア
ンテナ構造の要部を示し、（ａ）は側面図、（ｂ）は
（ａ）のＡ−Ａ′線断面図である。FIGS. 1A and 1B show a main part of a helical composite antenna structure according to an embodiment of the present invention, wherein FIG. 1A is a side view, and FIG.
【図２】従来のヘリカル複合アンテナ構造の要部を示
し、（ａ）は平面図、（ｂ）は（ａ）の側面図である。2 (a) is a plan view, and FIG. 2 (b) is a side view of FIG. 2 (a), showing a main part of a conventional helical composite antenna structure.
１ 円筒状部材 ２ リブ ３ 中心軸 ４ モノポ−ルアンテナ DESCRIPTION OF SYMBOLS 1 Cylindrical member 2 Rib 3 Center axis 4 Monopole antenna
Claims (4)
波用絶縁フィルムを券回されてなるヘリカルアンテナ
と、該ヘリカルアンテナ内にその中心軸に沿って設けら
れたモノポールアンテナから構成されるヘリカル複合ア
ンテナにおいて、 前記モノポールアンテナを支持するための中空部を有す
る中心軸と、該中心軸と前記筒状部材の内周面との間に
放射状に形成された少なくとも３本のリブとからなるモ
ノポールアンテナホルダーが、前記筒状部材と一体成形
されたことを特徴とするヘリカル複合アンテナ構造。1. A helical antenna in which a circularly polarized insulating film with a conductor pattern is wound around a cylindrical member, and a monopole antenna provided along the center axis in the helical antenna. A central axis having a hollow portion for supporting the monopole antenna, and at least three ribs formed radially between the central axis and the inner peripheral surface of the tubular member. A helical composite antenna structure, characterized in that a monopole antenna holder comprising:
は樹脂で一体成形されていることを特徴とする請求項１
記載のヘリカル複合アンテナ構造。2. The cylindrical member, the central shaft, and the rib are integrally formed of resin.
A helical composite antenna structure as described.
筒状部材の一端から他端までの全長にわたって形成され
ていることを特徴とする請求項１記載のヘリカル複合ア
ンテナ構造。3. The helical composite antenna structure according to claim 1, wherein the monopole antenna holder is formed over the entire length from one end to the other end of the tubular member.
筒状部材に、少なくとも一箇所、部分的に形成されてい
ることを特徴とする請求項１記載のヘリカル複合アンテ
ナ構造。4. The helical composite antenna structure according to claim 1, wherein the monopole antenna holder is partially formed at least at one position on the cylindrical member.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001052378A JP4539798B2 (en) | 2001-02-27 | 2001-02-27 | Helical composite antenna structure |
| US09/921,320 US6538611B2 (en) | 2000-08-02 | 2001-08-02 | Antenna apparatus having a simplified structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001052378A JP4539798B2 (en) | 2001-02-27 | 2001-02-27 | Helical composite antenna structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002261537A true JP2002261537A (en) | 2002-09-13 |
| JP4539798B2 JP4539798B2 (en) | 2010-09-08 |
Family
ID=18913017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001052378A Expired - Fee Related JP4539798B2 (en) | 2000-08-02 | 2001-02-27 | Helical composite antenna structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4539798B2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0284412U (en) * | 1988-12-15 | 1990-06-29 | ||
| JPH0629714A (en) * | 1992-07-06 | 1994-02-04 | Harada Ind Co Ltd | Helical antenna for satellite communication |
| JPH10290115A (en) * | 1997-04-11 | 1998-10-27 | Naohisa Goto | Shared antenna and portable radio equipment using the same |
| JPH11136021A (en) * | 1997-10-28 | 1999-05-21 | Nec Corp | Multimode antenna |
| JPH11330843A (en) * | 1998-05-11 | 1999-11-30 | Nec Corp | Helical antenna |
-
2001
- 2001-02-27 JP JP2001052378A patent/JP4539798B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0284412U (en) * | 1988-12-15 | 1990-06-29 | ||
| JPH0629714A (en) * | 1992-07-06 | 1994-02-04 | Harada Ind Co Ltd | Helical antenna for satellite communication |
| JPH10290115A (en) * | 1997-04-11 | 1998-10-27 | Naohisa Goto | Shared antenna and portable radio equipment using the same |
| JPH11136021A (en) * | 1997-10-28 | 1999-05-21 | Nec Corp | Multimode antenna |
| JPH11330843A (en) * | 1998-05-11 | 1999-11-30 | Nec Corp | Helical antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4539798B2 (en) | 2010-09-08 |
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