JPH05121924A - Built-in antenna system - Google Patents
Built-in antenna systemInfo
- Publication number
- JPH05121924A JPH05121924A JP3279210A JP27921091A JPH05121924A JP H05121924 A JPH05121924 A JP H05121924A JP 3279210 A JP3279210 A JP 3279210A JP 27921091 A JP27921091 A JP 27921091A JP H05121924 A JPH05121924 A JP H05121924A
- Authority
- JP
- Japan
- Prior art keywords
- built
- antenna element
- resonance circuit
- antenna
- frequency
- 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
Landscapes
- Support Of Aerials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、携帯用無線機等の筐体
に内蔵されるアンテナ装置いわゆる内蔵アンテナ装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device built in a housing of a portable radio or the like, a so-called built-in antenna device.
【０００２】[0002]
【従来の技術】図３および図４に従来の無線機の内蔵ア
ンテナ装置の構成の例を示す。図３および図４におい
て、１１は無線機の筐体、１２は給電点であり、図３に
おいては、内蔵ループアンテナ１３が無線機の筐体１１
内に固定されて取り付けられており、給電点１２に接続
されている。図４においては、内蔵Ｌ型アンテナ１４が
無線機の筐体１１内に固定されて取り付けられており、
給電点１２に接続されている。このように、従来の内蔵
アンテナ装置はアンテナ素子を無線機の筐体１１内に固
定して取り付け、給電点１２に接続するだけのものであ
った。2. Description of the Related Art FIG. 3 and FIG. 4 show an example of the configuration of a conventional built-in antenna device of a radio device. In FIGS. 3 and 4, reference numeral 11 is a radio housing, 12 is a feeding point, and in FIG. 3, the built-in loop antenna 13 is a radio housing 11.
It is fixedly mounted inside and is connected to the feeding point 12. In FIG. 4, the built-in L-shaped antenna 14 is fixed and attached in the housing 11 of the wireless device,
It is connected to the feeding point 12. As described above, the conventional built-in antenna device is one in which the antenna element is fixedly mounted in the housing 11 of the wireless device and connected to the feeding point 12.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら上記従来
の内蔵アンテナ装置では、アンテナ素子を無線機内に内
蔵する関係上、アンテナ素子の長さが波長に比較してか
なり短いため、放射抵抗分が少なく、非常に狭帯域な単
同調特性を有している。このため、ページャー等の単信
式無線機においては従来の内蔵アンテナ装置でも必要な
帯域幅が確保できるが、携帯用電話機やコードレス電話
機のように、送信と受信とでそれぞれ異なる周波数を使
用する複信式無線機おいては、単一の内蔵アンテナ装置
では必要な帯域幅が確保できず、送信用および受信用の
内蔵アンテナ装置をそれぞれ別個に備える必要があっ
た。このために、小型化を要求される無線機の筐体内に
複数の内蔵アンテナ装置が必要となり、構造が複雑とな
り、また、部品密度が大きくなるという問題があった。However, in the above-mentioned conventional built-in antenna device, the length of the antenna element is considerably shorter than the wavelength due to the fact that the antenna element is built in the radio device, so the radiation resistance is small, It has a very narrow band single tuning characteristic. Therefore, in a simplex wireless device such as a pager, the required bandwidth can be secured even with the conventional built-in antenna device, but as in a mobile phone or a cordless phone, a duplexer that uses different frequencies for transmission and reception is used. In a wireless communication device, a single built-in antenna device cannot secure the required bandwidth, and it is necessary to separately provide a built-in antenna device for transmission and a built-in antenna device for reception. For this reason, a plurality of built-in antenna devices are required in the housing of the wireless device, which is required to be downsized, resulting in a complicated structure and a high component density.
【０００４】本発明はこのような従来の問題を解決する
ものであり、１個の内蔵アンテナ装置で送信と受信の両
周波数に同調することが可能な優れた内蔵アンテナ装置
を提供することを目的とするものである。The present invention solves such a conventional problem, and an object of the present invention is to provide an excellent built-in antenna device which can tune to both transmission and reception frequencies with one built-in antenna device. It is what
【０００５】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するために、無線機の筐体内に実装した線状アンテナ素
子を２分割し、その分割した箇所に誘導素子と容量素子
とを並列に装荷して共振回路を形成し、この共振回路の
特性を利用して２つの周波数で共振するようにしたもの
である。In order to achieve the above-mentioned object, the present invention divides a linear antenna element mounted in a housing of a radio into two parts, and an inductive element and a capacitive element are arranged in parallel at the divided parts. A resonant circuit is formed by loading the above into a resonant circuit, and the characteristics of this resonant circuit are utilized to cause resonance at two frequencies.
【０００６】[0006]
【作用】したがって本発明によれば、アンテナ素子に装
荷した共振回路の特性により、共振周波数ではアンテナ
素子は等価的に共振回路が装荷された箇所で切断された
こととなり、共振周波数より低い周波数では共振回路は
インダクタンス特性を有するために、等価的にインダク
タンス装荷アンテナ素子として動作することになって、
アンテナ素子１本で送信，受信両周波数に共用可能とな
る。Therefore, according to the present invention, due to the characteristics of the resonance circuit loaded on the antenna element, the antenna element is equivalently disconnected at the location where the resonance circuit is loaded at the resonance frequency, and at the frequency lower than the resonance frequency. Since the resonance circuit has an inductance characteristic, it is equivalently operated as an inductance-loaded antenna element.
A single antenna element can be used for both transmitting and receiving frequencies.
【０００７】[0007]
【実施例】図１は本発明の一実施例における内蔵アンテ
ナ装置の構成を示し、図１（ａ）は内蔵アンテナ装置の
実装状態を、図１（ｂ）は等価回路を示す。1 shows the structure of a built-in antenna device according to an embodiment of the present invention. FIG. 1 (a) shows a mounted state of the built-in antenna device, and FIG. 1 (b) shows an equivalent circuit.
【０００８】図１において、１は無線機の筐体、２は給
電点である。３は線状アンテナ素子であり、無線機の筐
体１内に２つの部分３ａと３ｂに分割して実装されてい
る。４はアンテナ素子３の分割箇所に装荷された共振回
路である。５は誘導（インダクタンス）素子、６は容量
（キャパシタンス）素子で、両者は並列に接続されて共
振回路４を構成する。In FIG. 1, reference numeral 1 is a radio housing, and 2 is a feeding point. Reference numeral 3 denotes a linear antenna element, which is mounted in the housing 1 of the wireless device by being divided into two parts 3a and 3b. Reference numeral 4 is a resonance circuit loaded in the divided portions of the antenna element 3. Reference numeral 5 is an inductive (inductance) element, and 6 is a capacitance element, both of which are connected in parallel to form a resonance circuit 4.
【０００９】図２は図１に示すアンテナ素子３の周波数
による特性の相異を等価的に示したものである。図２に
おいて、７は等価インダクタンスである。FIG. 2 is an equivalent view showing the difference in the characteristics of the antenna element 3 shown in FIG. 1 depending on the frequency. In FIG. 2, 7 is an equivalent inductance.
【００１０】ここで、複信式無線機の送信周波数を
ｆT、受信周波数をｆRとし、ｆT＜ｆRと仮定する。装荷
された誘導素子５および容量素子６とからなる共振回路
４は、送信および受信に使用する２つの周波数のうち、
周波数の高い受信周波数ｆRで共振するように誘導素子
５および容量素子６の定数を選定する。このようにする
と、共振回路４のインピーダンスは受信周波数ｆRにお
いては非常に高くなり、アンテナ素子３は共振回路４に
よって等価的に切断されたことにほぼ等しくなる。一
方、受信周波数ｆRより低い送信周波数ｆTにおいては、
共振回路４はインダクタンス成分になるという特性を有
する。したがってアンテナ素子３は使用する送信周波数
ｆTおよび受信周波数ｆRにおいて、等価的に図２に示す
ようなアンテナ素子として動作することになる。[0010] Here, the transmission frequency of the Fukushinshiki radios f T, the reception frequency is f R, it is assumed that f T <f R. The resonant circuit 4 composed of the loaded inductive element 5 and capacitive element 6 has two frequencies out of two frequencies used for transmission and reception.
The constants of the inductive element 5 and the capacitive element 6 are selected so as to resonate at the high reception frequency f R. By doing so, the impedance of the resonance circuit 4 becomes extremely high at the reception frequency f R , and the antenna element 3 becomes almost equal to the equivalent disconnection by the resonance circuit 4. On the other hand, at the transmission frequency f T lower than the reception frequency f R ,
The resonance circuit 4 has a characteristic of becoming an inductance component. Therefore, the antenna element 3 equivalently operates as the antenna element as shown in FIG. 2 at the transmission frequency f T and the reception frequency f R used.
【００１１】図２（ａ）は受信周波数ｆRで動作する場
合のアンテナ素子を等価的に示しており、図１に示す共
振回路４によってアンテナ素子３が等価的に切断された
ことになり、アンテナ素子３は３ａの部分で構成される
こととなる。図２（ｂ）は送信周波数ｆTで動作する場
合のアンテナ素子３を等価的に示しており、共振回路４
は等価インダクタンス７となる。すなわち、受信周波数
ｆRではアンテナ素子３は３ａの部分のみで共振し、一
方、送信周波数ｆTではアンテナ素子３は３ａおよび３
ｂの部分および等価インダクタンス７で共振する。FIG. 2A equivalently shows the antenna element when operating at the reception frequency f R, which means that the antenna element 3 is equivalently cut off by the resonance circuit 4 shown in FIG. The antenna element 3 is composed of the portion 3a. FIG. 2B equivalently shows the antenna element 3 when operating at the transmission frequency f T.
Has an equivalent inductance 7. That is, at the reception frequency f R , the antenna element 3 resonates only in the portion 3a, while at the transmission frequency f T , the antenna element 3 is 3a and 3a.
It resonates at the portion b and the equivalent inductance 7.
【００１２】このように本実施例によれば、アンテナ素
子３およびその間に装荷される共振回路４により、内蔵
アンテナ素子が１本でありながら送信と受信の２周波数
で共振することが可能となるという効果を有する。As described above, according to this embodiment, the antenna element 3 and the resonance circuit 4 mounted between the antenna element 3 and the resonance circuit 4 can resonate at two frequencies of transmission and reception even though the number of the built-in antenna elements is one. Has the effect.
【００１３】なお、以上の実施例では無線機の筐体内に
実装した線状アンテナ素子の場合について説明したが、
線状アンテナ素子を無線機の筐体内のフレキシブル基板
上に形成したり、同じく回路基板上に形成したり、無線
機の筐体の内面に印刷によって形成しても良い。In the above embodiments, the case of the linear antenna element mounted in the housing of the radio device has been described.
The linear antenna element may be formed on a flexible substrate in the housing of the wireless device, on the same circuit board, or by printing on the inner surface of the housing of the wireless device.
【００１４】[0014]
【発明の効果】本発明は上記実施例より明らかなよう
に、無線機の筐体内に実装する線状アンテナ素子を２分
割し、その分割した箇所に共振回路を装荷するので、そ
の共振回路の共振周波数ではアンテナ素子は等価的に共
振回路が装荷された箇所で切断されたこととなり、共振
周波数より低い周波数では共振回路はインダクタンス特
性となり、アンテナ素子は等価的にそのインダクタンス
と共振するために、アンテナ素子１本で２つの周波数に
対して共用可能となるという効果を有する。As is apparent from the above embodiment, the present invention divides the linear antenna element mounted in the housing of the radio into two parts and loads the resonance circuit at the divided parts. At the resonance frequency, the antenna element is equivalently disconnected at the place where the resonance circuit is loaded, and at a frequency lower than the resonance frequency, the resonance circuit has an inductance characteristic, and the antenna element equivalently resonates with the inductance. This has the effect that one antenna element can be used for two frequencies.
【図１】本発明の一実施例における内蔵アンテナ装置の
構成を示す図 （ａ）は実装状態を示す一部切欠斜視図 （ｂ）は等価回路図FIG. 1 is a diagram showing a configuration of a built-in antenna device according to an embodiment of the present invention, (a) is a partially cutaway perspective view showing a mounted state, and (b) is an equivalent circuit diagram.
【図２】同じく等価的動作を示す回路図 （ａ）は共振回路の共振周波数における等価回路図 （ｂ）は共振周波数より低い周波数における等価回路図FIG. 2 is a circuit diagram showing an equivalent operation, and FIG. 2A is an equivalent circuit diagram at a resonance frequency of the resonance circuit, and FIG. 2B is an equivalent circuit diagram at a frequency lower than the resonance frequency.
【図３】従来の内蔵アンテナ装置の構成例を示す一部切
欠斜視図FIG. 3 is a partially cutaway perspective view showing a configuration example of a conventional built-in antenna device.
【図４】同じく別の構成例を示す一部切欠斜視図FIG. 4 is a partially cutaway perspective view showing another configuration example of the same.
１ 無線機の筐体 ３ 線状アンテナ素子 ４ 共振回路 ５ 誘導素子 ６ 容量素子 1 Radio housing 3 Linear antenna element 4 Resonance circuit 5 Inductive element 6 Capacitive element
Claims (4)
２周波数を使用する複信方式の無線機において、前記無
線機の筐体内に沿って線状アンテナ素子を配し、その線
状アンテナ素子の中間部に誘導素子と容量素子からなる
共振回路を装荷し、その共振回路の共振周波数を前記２
周波数のうち高い周波数帯近傍の周波数となるようにし
た内蔵アンテナ装置。1. In a duplexer wireless device using two frequencies, that is, a transmission frequency and a reception frequency that are different from each other, a linear antenna element is arranged along a casing of the wireless device, and the linear antenna element A resonance circuit composed of an inductive element and a capacitive element is loaded in the middle part, and the resonance frequency of the resonance circuit is set to 2
A built-in antenna device that is designed to have a frequency in the vicinity of a higher frequency band.
機の筐体内のフレキシブル基板上に形成されている請求
項１記載の内蔵アンテナ装置。2. The built-in antenna device according to claim 1, wherein the linear antenna element and the resonance circuit are formed on a flexible substrate in a housing of a radio device.
機の筐体内の回路基板上に形成されている請求項１記載
の内蔵アンテナ装置。3. The built-in antenna device according to claim 1, wherein the linear antenna element and the resonance circuit are formed on a circuit board in a housing of a radio device.
機の筐体の内面に形成されている請求項１記載の内蔵ア
ンテナ装置。4. The built-in antenna device according to claim 1, wherein the linear antenna element and the resonance circuit are formed on the inner surface of the housing of the radio device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3279210A JPH05121924A (en) | 1991-10-25 | 1991-10-25 | Built-in antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3279210A JPH05121924A (en) | 1991-10-25 | 1991-10-25 | Built-in antenna system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05121924A true JPH05121924A (en) | 1993-05-18 |
Family
ID=17607971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3279210A Pending JPH05121924A (en) | 1991-10-25 | 1991-10-25 | Built-in antenna system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05121924A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0772255A1 (en) | 1995-10-31 | 1997-05-07 | Tokin Corporation | Multiband antenna with a distributed-constant dielectric resonant circuit, and multiband portable radio apparatus comprising such an antenna |
| JP2006279915A (en) * | 2005-03-01 | 2006-10-12 | Matsushita Electric Ind Co Ltd | Antenna assembly and wireless apparatus |
| WO2020162521A1 (en) * | 2019-02-08 | 2020-08-13 | パナソニックＩｐマネジメント株式会社 | Conductive device, method for producing conductive device, and radio |
-
1991
- 1991-10-25 JP JP3279210A patent/JPH05121924A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0772255A1 (en) | 1995-10-31 | 1997-05-07 | Tokin Corporation | Multiband antenna with a distributed-constant dielectric resonant circuit, and multiband portable radio apparatus comprising such an antenna |
| US6011516A (en) * | 1995-10-31 | 2000-01-04 | Tokin Corporation | Multiband antenna with a distributed-constant dielectric resonant circuit as an LC parallel resonant circuit, and multiband portable radio apparatus using the multiband antenna |
| JP2006279915A (en) * | 2005-03-01 | 2006-10-12 | Matsushita Electric Ind Co Ltd | Antenna assembly and wireless apparatus |
| WO2020162521A1 (en) * | 2019-02-08 | 2020-08-13 | パナソニックＩｐマネジメント株式会社 | Conductive device, method for producing conductive device, and radio |
| JPWO2020162521A1 (en) * | 2019-02-08 | 2020-08-13 | ||
| EP3923302A4 (en) * | 2019-02-08 | 2022-07-27 | Panasonic Intellectual Property Management Co., Ltd. | Conductive device, method for producing conductive device, and radio |
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