JPH03147406A - Small sized antenna - Google Patents
Small sized antennaInfo
- Publication number
- JPH03147406A JPH03147406A JP28479389A JP28479389A JPH03147406A JP H03147406 A JPH03147406 A JP H03147406A JP 28479389 A JP28479389 A JP 28479389A JP 28479389 A JP28479389 A JP 28479389A JP H03147406 A JPH03147406 A JP H03147406A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- coil
- loop
- conductor plate
- width
- 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.)
- Pending
Links
- 239000004020 conductor Substances 0.000 abstract description 13
- 230000007423 decrease Effects 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 239000003989 dielectric material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 101150084315 slc38a2 gene Proteins 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
Landscapes
- Aerials With Secondary Devices (AREA)
- Details Of Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、携帯用小型無線機等に使用される小型アンテ
ナに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small antenna used in a small portable radio device or the like.
第３図は従来のヘリカルアンテナの例を示す図であって
、（ａ）はバー形状のもの、（ｂ）はループ形状のもの
を示しており、５１はコイル、５２はボビン、５３．５
３’は給電点を表わしている。FIG. 3 is a diagram showing an example of a conventional helical antenna, in which (a) shows a bar-shaped antenna and (b) shows a loop-shaped one, 51 is a coil, 52 is a bobbin, 53.5
3' represents a power feeding point.
このような、従来のヘリカルアンテナは携帯用小型無線
機に用いる小型アンテナとして自己共振がとれ、また整
合回路を必要としない上、ループアンテナに比べかなり
高い利得が得られるという特徴があった。Such conventional helical antennas have the characteristics of being able to self-resonate as a small antenna used in a small portable radio device, not requiring a matching circuit, and being able to obtain considerably higher gain than a loop antenna.
上述したように、ヘリカルアンテナはループアンテナ等
より高い利得が得られるものであるが、その共振周波数
帯域は比較的狭く、またヘリカルアンテナを同図（ｂ）
に示すようにループ状に構成して人体装着用バンド形ア
ンテナとして使用した場合には、例えば、腕に巻き付け
た場合と巻き付けない場合の、共振周波数のずれが非常
に大きいため、本来ヘリカルアンテナが共振周波数帯域
で有する高利得を実用上維持するのが不可能であるとい
う問題点があった。As mentioned above, a helical antenna can obtain higher gain than a loop antenna, etc., but its resonant frequency band is relatively narrow, and the helical antenna is
When configured in a loop shape and used as a band-type antenna worn on the human body, as shown in Figure 2, for example, the difference in resonance frequency between when it is wrapped around the arm and when it is not wrapped is very large, so it is not possible to use a helical antenna. There is a problem in that it is practically impossible to maintain the high gain in the resonant frequency band.
本発明は、このような従来の問題点に鑑み、ループ状と
して、人体の腕などに巻き付けて使用した場合であって
も、利得低下を生ずることがなく、良好な効率と指向特
性をを実現しうる小型アンテナを提供することを目的と
している。In view of these conventional problems, the present invention achieves good efficiency and directional characteristics without causing a decrease in gain even when used in a loop shape and wrapped around the arm of a human body. The aim is to provide a compact antenna that can
本発明によれば上述の目的は、前記特許請求の範囲に記
載した手段により達成される。According to the invention, the above-mentioned object is achieved by the means specified in the claims.
すなわち、本発明は、波長に比較して十分に小さいピッ
チ１１幅−１なか？！−ｈを有するフィルをループ状に
構成し、該コイルの両端部に給電点を設けるとともに、
ループの内側に絶縁膜を間に介して、導体板を展着せし
めてなる小形アンテナである。That is, in the present invention, the pitch 11 width -1 is sufficiently small compared to the wavelength. ! - h is configured in a loop shape, and feeding points are provided at both ends of the coil,
This is a small antenna consisting of a conductor plate spread inside a loop with an insulating film in between.
本発明は、ヘリカルアンテナをループ状に構成し、かつ
ループの内側に絶縁膜を間に介した状態で導体膜を展着
せしめることを主要な特徴としている。この構成により
、ループ内に誘電物質を挿入しても共振周波数の変化は
殆どない。The main feature of the present invention is that the helical antenna is formed into a loop, and a conductive film is spread inside the loop with an insulating film interposed therebetween. With this configuration, there is almost no change in the resonant frequency even if a dielectric material is inserted into the loop.
従って、ループ状とすることにより、例えば、人体の腕
等に巻くバンドとしてアンテナを構成することができる
。Therefore, by forming the antenna into a loop shape, the antenna can be configured as a band wrapped around a human arm or the like.
また、従来のヘリカルアンテナと同じく自己共振形アン
テナであるため、放射効率に極めて優れ、コイルとルー
プの２つの形状の組み合わせであるために比較的無指向
な特性が得られる。Furthermore, since it is a self-resonant antenna like the conventional helical antenna, it has extremely excellent radiation efficiency, and because it is a combination of two shapes, a coil and a loop, relatively non-directional characteristics can be obtained.
第１図は本発明の一実施例を示す図であって、（ａ）は
斜視図、（ｂ）は断面の一部を示しており、１はフィル
、２は絶縁膜、３は導体板、４，４′は給電点、５はコ
イルを巻くためのボビンを表わしている。FIG. 1 is a diagram showing an embodiment of the present invention, in which (a) is a perspective view and (b) is a part of a cross section, 1 is a fill, 2 is an insulating film, and 3 is a conductor plate. , 4, 4' are power feeding points, and 5 is a bobbin for winding the coil.
同図において、１は波長に比して十分に小さいピッチｐ
１幅胃、高さｈを有するフィル（この実施例では偏平状
のコイルを用いている）であり、２は薄い絶縁膜、３は
薄い導体板である。同図によって明らかなように、コイ
ル１と導体板３は絶Ａｔａ２によって電気的に絶縁され
ている。In the same figure, 1 is a pitch p that is sufficiently small compared to the wavelength.
1 is a fill having a width and a height h (a flat coil is used in this embodiment), 2 is a thin insulating film, and 3 is a thin conductor plate. As is clear from the figure, the coil 1 and the conductor plate 3 are electrically insulated by the insulation Ata2.
これらのフィル１、絶縁膜２、導体板３を一体構造とし
て、同図（ａ）に示すようにループ状に構成し、コイル
の両端を以て、給電点４４′としている。The fill 1, the insulating film 2, and the conductor plate 3 are integrally formed into a loop as shown in FIG.
本実施例の場合、コイル１は幅−＝２０＋ｍ。In the case of this embodiment, the width of the coil 1 is −=20+m.
高３ｈ＝２ｍ鶴、ピッチｐ：：３ｍｍであり、直径ｄ＝
約５ ｃｍ 、全長は約１５ｃｍである。また、材質は
コイル１は＃！Ａｉ、絶縁膜２はポリエチレン、導体板
３は銅ハクを使用している。ループの直径′ｄは約５ｃ
ｍであり、２８０ＭＨｚ付近で自己共振し、帯域５〜６
ＭＨｚを有するアンテナとしで動作する。Height 3h = 2m crane, pitch p:: 3mm, diameter d =
Approximately 5 cm, total length is approximately 15 cm. Also, the material of coil 1 is #! Ai, the insulating film 2 is made of polyethylene, and the conductor plate 3 is made of copper foil. The diameter of the loop 'd is approximately 5c.
m, self-resonant around 280MHz, band 5-6
It operates as an antenna with MHz.
このアンテナは、その全体をプラスチック等の素材で固
めることにより、人体の腕等に装着可能なバンドとして
使用することができる。このときは、更に外側を装飾的
な部材で覆って腕輪ようのものとしても良い。This antenna can be used as a band that can be worn on a human arm or the like by hardening the entire antenna with a material such as plastic. In this case, the outside may be further covered with a decorative member to make it look like a bracelet.
アンテナの寸法（ｗ ＊ ｈ ｔ ｐ＊ ｄ ）は、主
に希望するアンテナ特性によって決定され、かつ経験に
よる実績データに基づいて定められるが、最終的には実
験によって決定される。The dimensions of the antenna (w*htp*d) are primarily determined by the desired antenna characteristics and are determined based on empirical performance data, but are ultimately determined by experiment.
実際には、アンテナの共振周波数ｆは、ピッチｐによっ
て決定される巻き数ｎにほぼ比例し、また高さｈはＯか
ら３１の範囲で変化させてもアンテナの特性にそれほど
影響がないことが分かっているので、これらの魚を考慮
しで決定することになる。In reality, the resonant frequency f of the antenna is approximately proportional to the number of turns n determined by the pitch p, and the height h can be varied within the range of 0 to 31 without much effect on the antenna characteristics. Since we know this, we will take these fish into account when deciding.
第２図は、本発明のアンテナの特性の例を示す図であっ
て、本発明の構成による７ンテナと本発明の構成のアン
テナから導体板を取り除いたアンテナの両方について、
ループの内側に、人体と同じ誘電率を有する物質を挿入
した場合と、挿入しない場合の共振周波数の変化を示し
たものである。FIG. 2 is a diagram showing an example of the characteristics of the antenna of the present invention, for both the 7-antenna according to the configuration of the present invention and the antenna with the conductor plate removed from the antenna configured according to the present invention.
This figure shows the change in resonance frequency when a substance having the same dielectric constant as the human body is inserted inside the loop and when it is not inserted.
同図において、各特性図の１桁目の英字符Ｍは導体板を
装着した本発明の構成によるアンテすを、Ｎは該アンテ
ナから導体板を取り除いたアンテナを示しており、また
、２桁目の英字符Ｆは内部に誘電物質を挿入しない場合
を、またＩは誘電物質を挿入した場合を示している。In the same figure, the alphabetic character M in the first digit of each characteristic diagram indicates the antenna according to the structure of the present invention equipped with a conductor plate, and N indicates the antenna with the conductor plate removed from the antenna. The letter F indicates the case where no dielectric material is inserted inside, and the letter I indicates the case where the dielectric material is inserted.
同図において明らかなように、本発明の構成によるアン
テナから導体板を取り除いたアンテナの共振周波数の変
化は、内部に誘電物質を挿入した場合に５０〜１００Ｍ
Ｈｚにもおよぶのに対しく利得も急激に低下する）、本
発明のアンテナにおいては共振周波数の変化は、はとん
どないことが分かる。そのため、利得も変わらない。As is clear from the figure, the change in the resonant frequency of the antenna according to the present invention without the conductive plate is 50 to 100 M when a dielectric material is inserted inside.
Hz, the gain also decreases rapidly), but it can be seen that in the antenna of the present invention, there is almost no change in the resonant frequency. Therefore, the profit remains unchanged.
上記の説明から明らかなように、本発明のアンテナは波
長に比較して十分率さいピッチ、幅、高さを有するコイ
ルをループ状に構成しているので、自己共振のとれる、
利得、指向性にきわめて優れたアンテナとして作用する
。As is clear from the above description, the antenna of the present invention has a loop-shaped coil having a pitch, width, and height that is sufficiently large compared to the wavelength, so that self-resonance can be achieved.
It acts as an antenna with extremely good gain and directivity.
そして、ループ内側に導体板を展着しであるため、腕に
ま軽つけるなど、人体に装着した場合の共振周波数の変
化がほとんどなく、人体装着時、非装着時の如何にかか
わらず安定した特性を示す。Since the conductor plate is spread inside the loop, there is almost no change in the resonant frequency when worn on the human body, such as when worn around the arm, making it stable regardless of whether it is worn on the human body or not. Show characteristics.
従って、腕バンド等として人体に装着して使用できる利
点がある。そして、このように、アンテナを人体に装着
することによりアンテナを本体の中に組み込む必要がな
くなるから携帯無線機の一層の小型化に役立つという効
果を奏する。Therefore, it has the advantage that it can be worn on the human body as a wrist band or the like. In this way, by attaching the antenna to the human body, there is no need to incorporate the antenna into the main body, which has the effect of contributing to further miniaturization of the portable radio device.
第１図は本発明の一実施例を示す図、第２図は本発明の
アンテナの特性の例を示す図、第３図は従来のヘリカル
アンテナの例を示す図である。
１ ・・・・・・コイル、 ２ ・・・・・・絶
縁膜、３ ・・・・・・導体板、 ４ ４′・・・
・・・給電点、５ ・・・・・・ボビンFIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an example of characteristics of the antenna of the present invention, and FIG. 3 is a diagram showing an example of a conventional helical antenna. 1... Coil, 2... Insulating film, 3... Conductor plate, 4 4'...
...Feeding point, 5 ...Bobbin
Claims (1)
有するコイル（１）をループ状に構成し、該コイルの両
端部に給電点（４）、（４′）を設けるとともに、ルー
プの内側に絶縁膜（２）を間に介して、導体板（３）を
展着せしめてなることを特徴とする小形アンテナ。A coil (1) having a pitch p, width w, and height h that is sufficiently small compared to the wavelength is configured in a loop shape, and feeding points (4) and (4') are provided at both ends of the coil, and A small antenna characterized by having a conductive plate (3) spread inside a loop with an insulating film (2) interposed therebetween.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28479389A JPH03147406A (en) | 1989-11-02 | 1989-11-02 | Small sized antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28479389A JPH03147406A (en) | 1989-11-02 | 1989-11-02 | Small sized antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03147406A true JPH03147406A (en) | 1991-06-24 |
Family
ID=17683095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28479389A Pending JPH03147406A (en) | 1989-11-02 | 1989-11-02 | Small sized antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03147406A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5532705A (en) * | 1993-03-17 | 1996-07-02 | Seiko Epson Corporation | Wrist-mounted-type antenna device and apparatus having the antenna device |
| US5589840A (en) * | 1991-11-05 | 1996-12-31 | Seiko Epson Corporation | Wrist-type wireless instrument and antenna apparatus |
| US5946610A (en) * | 1994-10-04 | 1999-08-31 | Seiko Epson Corporation | Portable radio apparatus having a slot antenna |
-
1989
- 1989-11-02 JP JP28479389A patent/JPH03147406A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5589840A (en) * | 1991-11-05 | 1996-12-31 | Seiko Epson Corporation | Wrist-type wireless instrument and antenna apparatus |
| US5532705A (en) * | 1993-03-17 | 1996-07-02 | Seiko Epson Corporation | Wrist-mounted-type antenna device and apparatus having the antenna device |
| US5946610A (en) * | 1994-10-04 | 1999-08-31 | Seiko Epson Corporation | Portable radio apparatus having a slot antenna |
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