JPH06152221A - Antenna for mobile radio equipment - Google Patents
Antenna for mobile radio equipmentInfo
- Publication number
- JPH06152221A JPH06152221A JP5053378A JP5337893A JPH06152221A JP H06152221 A JPH06152221 A JP H06152221A JP 5053378 A JP5053378 A JP 5053378A JP 5337893 A JP5337893 A JP 5337893A JP H06152221 A JPH06152221 A JP H06152221A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- capacitor
- transmission line
- mobile radio
- impedance
- 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
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Transceivers (AREA)
- Transmitters (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主として移動無線機で
使用されるアンテナに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an antenna used in a mobile radio device.
【０００２】[0002]
【従来の技術】図５は従来の移動無線用アンテナの構成
を示す。図５において５０１はホイップアンテナであっ
て、無線機筐体５０２に突出して支持されている。携帯
電話等の移動体無線機では一般にアンテナの利得を大き
くするため使用する電波の波長の３／８〜５／８程度の
比較的長いホイップアンテナが用いられることが多い。
この場合アンテナのインピーダンスが５０Ωに比較して
非常に大きくなることからアンテナを無線回路部に接続
するに当たってインピーダンス整合を必要とする。図５
ではホイップアンテナの一端５０３は他端を接地したコ
イル状のインダクタンス５０４と電気的に接続されてい
る。そしてインダクタンスのコイルの巻線上の一点５０
５と無線回路部５０６は同軸線路５０７によって電気的
に接続されており、これによってインピーダンス整合が
はかられている。図６は図５に示す移動無線用アンテナ
の無線回路部から見たインピーダンスを示したものであ
る。図６において（ａ）はスミスチャート上のインピー
ダンス、（ｂ）はＳＷＲ特性を表わしている。アンテナ
は周波数ｆ0においてよく整合しており、ｆ0付近の周波
数帯でアンテナは良好な特性を示す。2. Description of the Related Art FIG. 5 shows the structure of a conventional mobile radio antenna. In FIG. 5, reference numeral 501 denotes a whip antenna, which is projected and supported by the radio housing 502. In mobile radios such as mobile phones, generally, a relatively long whip antenna, which is about 3/8 to 5/8 of the wavelength of the radio wave used, is often used to increase the gain of the antenna.
In this case, the impedance of the antenna becomes very large as compared with 50Ω, and therefore impedance matching is required to connect the antenna to the wireless circuit section. Figure 5
Then, one end 503 of the whip antenna is electrically connected to a coiled inductance 504 whose other end is grounded. And a point 50 on the winding of the inductance coil
5 and the radio circuit unit 506 are electrically connected by a coaxial line 507, and impedance matching is achieved by this. FIG. 6 shows impedance seen from the radio circuit part of the mobile radio antenna shown in FIG. In FIG. 6, (a) shows impedance on the Smith chart, and (b) shows SWR characteristics. The antenna is well matched at the frequency f 0 , and the antenna exhibits good characteristics in the frequency band near f 0 .
【０００３】[0003]
【発明が解決しようとする課題】しかしながら上記のよ
うな構成では、良好なインピーダンス整合を示す周波数
範囲はｆ0付近の狭い周波数帯域のみであって、たとえ
ば図６のｆ1とｆ2で示したような広い周波数範囲でアン
テナを使用するような場合には、良好な整合状態が得ら
れずアンテナの特性が劣化する問題点を有していた。ま
た従来の技術では整合回路にコイル状のインダクタンス
を用いていたため実装がめんどうで、小型、低価格化に
対して障害になっていた。However, in the above-mentioned configuration, the frequency range exhibiting good impedance matching is only the narrow frequency band near f 0 , and for example, it is shown by f 1 and f 2 in FIG. When the antenna is used in such a wide frequency range, there is a problem that a good matching state cannot be obtained and the characteristics of the antenna deteriorate. Further, in the conventional technology, since a coil-shaped inductance is used in the matching circuit, mounting is troublesome, which is an obstacle to reduction in size and cost.
【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、製作が容易で小型、低価格化が実現でき、
かつ広い周波数範囲で良好な整合状態に保つことができ
る移動無線用アンテナを提供することを目的としたもの
である。The present invention solves such a conventional problem and is easy to manufacture, small in size and low in cost.
Moreover, it is an object of the present invention to provide a mobile radio antenna capable of maintaining a good matching state in a wide frequency range.
【０００５】[0005]
【課題を解決するための手段】上記問題点を解決するた
めに本発明の移動無線用アンテナは、ホイップアンテナ
に、裏面を接地した誘電体基板上に形成された曲がりく
ねった伝送ラインの一端を接続し、前記伝送ラインのも
う一方の端を接地し、前記伝送ラインとアース間にキャ
パシタを接続すると共に前記伝送ライン上の一点を給電
点とするように構成したものである。In order to solve the above problems, in the mobile radio antenna of the present invention, one end of a meandering transmission line formed on a dielectric substrate whose back surface is grounded is connected to a whip antenna. However, the other end of the transmission line is grounded, a capacitor is connected between the transmission line and the ground, and one point on the transmission line is used as a feeding point.
【０００６】[0006]
【作用】本発明は上記した構成によって、アンテナのＳ
ＷＲ特性を双峰特性にすることができるので、それによ
ってインピーダンス特性を広帯域にすることができる。
また整合回路は誘電体基板上のパターンによって形成す
ることができるので製作が極めて容易でアンテナの小
型、低価格化が可能である。According to the present invention, the S of the antenna is constructed by the above configuration.
Since the WR characteristic can be a bimodal characteristic, the impedance characteristic can be widebanded by it.
Further, since the matching circuit can be formed by a pattern on the dielectric substrate, it is extremely easy to manufacture and the antenna can be made small and the cost can be reduced.
【０００７】[0007]
【実施例】以下本発明の一実施例の移動無線用アンテナ
について、図面を参照しながら説明する。図１は本発明
の第１の実施例における移動無線用アンテナの構成を示
すものである。図１において１０１はホイップアンテナ
であって、無線機筐体１０２に突出して支持されてい
る。ホイップアンテナの一端１０３は誘電体基板１０４
上に形成された曲がりくねった伝送ライン１０５の一端
１０６ａと電気的に接続されており、伝送ライン１０５
のもう一方の一端１０６ｂは接地されている。また誘電
体基板１０４の裏面は接地されている。伝送ライン上の
一点１０７と無線回路部１０８は同軸線路１０９によっ
て電気的に接続されている。また伝送ライン上の他の一
点１１０とアース間にはキャパシタ１１１が接続されて
いる。つまりホイップアンテナ１０１と無線回路部１０
８は整合回路部１１２によってインピーダンス整合がは
かられている。図２は図１に示す移動無線用アンテナの
無線回路部から見たインピーダンスを示したものであ
る。図２において（ａ）はスミスチャート上のインピー
ダンス、（ｂ）はＳＷＲ特性を表わしている。実験によ
れば伝送ライン１０５の長さ、キャパシタ１１１の容量
値そして同軸線路の接続点１０７とキャパシタの接続点
１１０の位置を最適にすることによってＳＷＲ特性を図
２（ｂ）のように双峰特性にすることができる。これは
図５（ａ）と図２（ａ）を比較するとわかるように、ス
ミスチャート上において高い周波数のインピーダンスが
キャパシタの付加によって低い周波数のインピーダンス
よりも時計回りに大きく回転し、２共振特性を得ること
ができるからである。これによって従来の移動無線用ア
ンテナでは達成できなかったような広い帯域幅のアンテ
ナを得ることができる。たとえば実験によると中心周波
数が９００ＭＨｚで長さ１３ｃｍ（約３／８波長）のホ
イップアンテナを用いる場合、伝送ラインの長さを１８
ｃｍ、キャパシタの容量値を４ｐＦ、同軸線路とキャパ
シタの接続点をアース側からそれぞれ７ｃｍ、３ｃｍと
することによって約２００ＭＨｚ（ＳＷＲ＜２．５）の
帯域幅を得ることができた。また本発明の移動無線用ア
ンテナでは従来用いていたようなコイル状のインダクタ
ンスは用いておらず、整合回路部は基板上のパターンに
よって形成されている。このため製作が極めて容易でア
ンテナの小型、低価格化が実現できる。DESCRIPTION OF THE PREFERRED EMBODIMENTS A mobile radio antenna according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a mobile radio antenna according to the first embodiment of the present invention. In FIG. 1, reference numeral 101 denotes a whip antenna, which is projected and supported by the radio housing 102. One end 103 of the whip antenna is a dielectric substrate 104.
The transmission line 105 is electrically connected to one end 106a of the winding transmission line 105 formed above.
The other end 106b of the above is grounded. The back surface of the dielectric substrate 104 is grounded. A point 107 on the transmission line and the wireless circuit unit 108 are electrically connected by a coaxial line 109. A capacitor 111 is connected between another point 110 on the transmission line and the ground. That is, the whip antenna 101 and the wireless circuit unit 10
8 is impedance-matched by the matching circuit unit 112. FIG. 2 shows impedance seen from the radio circuit section of the mobile radio antenna shown in FIG. In FIG. 2, (a) shows impedance on the Smith chart, and (b) shows SWR characteristics. According to the experiment, by optimizing the length of the transmission line 105, the capacitance value of the capacitor 111, and the positions of the connection point 107 of the coaxial line and the connection point 110 of the capacitor, the SWR characteristic is shown in FIG. Can be a property. As can be seen by comparing FIG. 5 (a) and FIG. 2 (a), the impedance of the high frequency on the Smith chart rotates more clockwise than the impedance of the low frequency due to the addition of the capacitor, and the two resonance characteristic is obtained. Because you can get it. As a result, it is possible to obtain an antenna having a wide bandwidth that cannot be achieved by the conventional mobile radio antenna. For example, according to experiments, when a whip antenna with a center frequency of 900 MHz and a length of 13 cm (about 3/8 wavelength) is used, the length of the transmission line is 18
cm, the capacitance value of the capacitor was 4 pF, and the connection points of the coaxial line and the capacitor were 7 cm and 3 cm, respectively, from the ground side, whereby a bandwidth of about 200 MHz (SWR <2.5) could be obtained. Further, the mobile radio antenna of the present invention does not use the coiled inductance which is conventionally used, but the matching circuit portion is formed by the pattern on the substrate. For this reason, it is extremely easy to manufacture, and the antenna can be made small in size and low in cost.
【０００８】図３は本発明の第２の実施例における移動
無線用アンテナの整合回路部のみの構成を示したもので
あって、キャパシタ３０１と伝送ライン３０２の一端を
スルーホール３０３と３０４によって接地したものであ
る。また図３では同軸線路３０５の外導体もスルーホー
ル３０６によって接地している。このようにするとなお
一層小型で安定に、かつ安価にアンテナの構成すること
ができる。FIG. 3 shows only the matching circuit portion of the mobile radio antenna according to the second embodiment of the present invention. One end of the capacitor 301 and the transmission line 302 is grounded by through holes 303 and 304. It was done. Further, in FIG. 3, the outer conductor of the coaxial line 305 is also grounded through the through hole 306. In this way, the antenna can be made even smaller, more stable, and cheaper.
【０００９】図４は本発明の第３の実施例における移動
無線用アンテナの構成を示すものである。図４において
図１と同じ番号のものの機能は同様であるので説明を省
略する。図４ではキャパシタは４０１、４０２、４０３
の３つのキャパシタで構成されている。実験によるとこ
のように複数のキャパシタを用いても第１の実施例で説
明したのと同様の２共振特性を得ることができ、かつ帯
域幅がキャパシタ１個のときよりも広帯域にすることが
できる。例えば、第１の実施例における説明と同様９０
０ＭＨｚ帯の３／８波長ホイップアンテナでキャパシタ
４０１を０．５ｐＦ，４０２を４ｐＦ、４０３を６ｐＦ
とすることによって２５０ＭＨｚの帯域幅を得ることが
できた。このようにキャパシタの個数を複数にし、その
接続箇所ならびに給電点の位置を適切に選ぶことによっ
てより広帯域な特性が得られる。なお、キャパシタを複
数にした場合も第２の実施例で説明したのと同様にキャ
パシタの一端をスルーホールによって接地してもよい。FIG. 4 shows the configuration of a mobile radio antenna according to the third embodiment of the present invention. In FIG. 4, the functions of the same numbers as in FIG. In FIG. 4, capacitors are 401, 402, 403.
It is composed of three capacitors. According to the experiment, even if a plurality of capacitors are used in this way, the same two-resonance characteristic as described in the first embodiment can be obtained, and the bandwidth can be made wider than that when one capacitor is used. it can. For example, as with the description in the first embodiment, 90
Capacitor 401 is 0.5 pF, 402 is 4 pF, 403 is 6 pF by a 0/8 band 3/8 wavelength whip antenna.
As a result, a bandwidth of 250 MHz could be obtained. In this way, a wider range of characteristics can be obtained by making the number of capacitors plural and appropriately selecting the connecting points and the positions of the feeding points. Even when a plurality of capacitors are used, one end of the capacitor may be grounded by a through hole as described in the second embodiment.
【００１０】なお、図１あるいは図３において給電線は
同軸線路でなくても、たとえば誘電体基板上に形成され
たストリップ線路であってもよい。また図１あるいは図
３では整合回路を構成している誘電体基板は無線回路部
と分離されているが、もちろん無線回路部に用いている
誘電体基板と一体になっていてもよい。The feeder line in FIG. 1 or 3 need not be a coaxial line, but may be a strip line formed on a dielectric substrate, for example. Although the dielectric substrate forming the matching circuit is separated from the wireless circuit section in FIG. 1 or 3, it may be integrated with the dielectric substrate used in the wireless circuit section.
【００１１】[0011]
【発明の効果】以上のように本発明は、ホイップアンテ
ナに、裏面を接地した誘電体基板上に形成された曲がり
くねった伝送ラインの一端を接続し、前記伝送ラインの
もう一方の端を接地し、前記伝送ラインとアース間にキ
ャパシタを接続すると共に前記伝送ライン上の一点を給
電点とするように構成したものであって、これによりＳ
ＷＲ特性を双峰特性にすることができるので、極めて簡
単な構成で広帯域な移動無線用アンテナを実現すること
ができる。As described above, according to the present invention, one end of a meandering transmission line formed on a dielectric substrate whose back surface is grounded is connected to the whip antenna, and the other end of the transmission line is grounded. , A capacitor is connected between the transmission line and the ground and one point on the transmission line is used as a feeding point.
Since the WR characteristic can be a bimodal characteristic, a wideband mobile radio antenna can be realized with an extremely simple configuration.
【図１】本発明の第１の実施例における移動無線用アン
テナの構成図FIG. 1 is a configuration diagram of a mobile radio antenna according to a first embodiment of the present invention.
【図２】（ａ）は本発明の第１の実施例における移動無
線用アンテナのインピーダンス軌跡を示す図 （ｂ）は本発明の第１の実施例における移動無線用アン
テナのＳＷＲ特性図FIG. 2A is a diagram showing an impedance locus of the mobile radio antenna in the first embodiment of the present invention, and FIG. 2B is a SWR characteristic diagram of the mobile radio antenna in the first embodiment of the present invention.
【図３】本発明の第２の実施例における移動無線用アン
テナの整合回路部のみの構成図FIG. 3 is a configuration diagram of only a matching circuit unit of a mobile radio antenna according to a second embodiment of the present invention.
【図４】本発明の第３の実施例における移動無線用アン
テナの構成図FIG. 4 is a configuration diagram of a mobile radio antenna according to a third embodiment of the present invention.
【図５】従来の移動無線用アンテナの構成図FIG. 5 is a configuration diagram of a conventional mobile radio antenna.
【図６】（ａ）は従来の移動無線用アンテナのインピー
ダンス軌跡を示す図 （ｂ）は従来の移動無線用アンテナのＳＷＲ特性図FIG. 6A is a diagram showing an impedance locus of a conventional mobile radio antenna. FIG. 6B is a SWR characteristic diagram of the conventional mobile radio antenna.
１０１ ホイップアンテナ １０２ 筐体 １０４ 誘電体基板 １０５ 伝送ライン １０８ 無線回路部 １０９ 同軸線路 １１１ キャパシタ １１２ 整合回路部 ４０１、４０２、４０３ キャパシタ 101 Whip Antenna 102 Housing 104 Dielectric Substrate 105 Transmission Line 108 Radio Circuit Section 109 Coaxial Line 111 Capacitor 112 Matching Circuit Section 401, 402, 403 Capacitor
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｂ 1/40 8948−5Ｋ 7/26 Ｕ 9297−5Ｋ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location H04B 1/40 8948-5K 7/26 U 9297-5K
Claims (3)
体基板上に形成された曲がりくねった伝送ラインの一端
を接続し、前記伝送ラインのもう一方の端を接地し、前
記伝送ラインとアース間にキャパシタを接続すると共に
前記伝送ライン上の一点を給電点とすることを特徴とす
る移動無線用アンテナ。1. A whip antenna is connected to one end of a meandering transmission line formed on a dielectric substrate whose back surface is grounded, and the other end of the transmission line is grounded, and between the transmission line and ground. An antenna for mobile radio, wherein a capacitor is connected and one point on the transmission line is used as a feeding point.
板上に設けたスルーホールによって接地したことを特徴
とする請求項１記載の移動無線用アンテナ。2. The mobile radio antenna according to claim 1, wherein one end of the transmission line and the capacitor are grounded by a through hole provided on the dielectric substrate.
さのホイップアンテナを用いることを特徴とする請求項
１記載の移動無線用アンテナ。3. A mobile radio antenna according to claim 1, wherein a whip antenna having a length of ⅜ to ⅜ of the wavelength of the radio wave used is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05337893A JP3259411B2 (en) | 1992-09-21 | 1993-03-15 | Mobile radio antenna |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25101892 | 1992-09-21 | ||
| JP4-251018 | 1992-09-21 | ||
| JP05337893A JP3259411B2 (en) | 1992-09-21 | 1993-03-15 | Mobile radio antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06152221A true JPH06152221A (en) | 1994-05-31 |
| JP3259411B2 JP3259411B2 (en) | 2002-02-25 |
Family
ID=26394093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05337893A Expired - Fee Related JP3259411B2 (en) | 1992-09-21 | 1993-03-15 | Mobile radio antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3259411B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990034478A (en) * | 1997-10-29 | 1999-05-15 | 구자홍 | Receiver for mobile communication terminal |
| WO2000030209A1 (en) * | 1998-11-13 | 2000-05-25 | Allgon Ab | A portable radio communication device and an antenna device therefor including a top capacitance |
| US6166694A (en) * | 1998-07-09 | 2000-12-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Printed twin spiral dual band antenna |
| US6329962B2 (en) | 1998-08-04 | 2001-12-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiple band, multiple branch antenna for mobile phone |
| US6353443B1 (en) | 1998-07-09 | 2002-03-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Miniature printed spiral antenna for mobile terminals |
| US6633262B1 (en) | 2000-06-01 | 2003-10-14 | Mitsubishi Denki Kabushiki Kaisha | Portable wireless terminal |
| KR20040019781A (en) * | 2002-08-29 | 2004-03-06 | (주) 코산아이엔티 | Antenna assembling structure of mobile communication terminal for multi band |
| US6768464B1 (en) | 2000-06-01 | 2004-07-27 | Mitsubishi Denki Kabushiki Kaisha | Antenna element and portable information terminal |
| KR100500434B1 (en) * | 2002-04-10 | 2005-07-14 | 주식회사 선우커뮤니케이션 | The antenna using compact size meander and planar inverted F-type in mobile communication terminals |
| CN100397703C (en) * | 2004-06-22 | 2008-06-25 | 明基电通股份有限公司 | Antenna device |
| CN103259080A (en) * | 2012-02-15 | 2013-08-21 | 摩托罗拉解决方案公司 | Hybrid antenna for portable communication devices |
-
1993
- 1993-03-15 JP JP05337893A patent/JP3259411B2/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990034478A (en) * | 1997-10-29 | 1999-05-15 | 구자홍 | Receiver for mobile communication terminal |
| US6166694A (en) * | 1998-07-09 | 2000-12-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Printed twin spiral dual band antenna |
| US6353443B1 (en) | 1998-07-09 | 2002-03-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Miniature printed spiral antenna for mobile terminals |
| US6329962B2 (en) | 1998-08-04 | 2001-12-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiple band, multiple branch antenna for mobile phone |
| WO2000030209A1 (en) * | 1998-11-13 | 2000-05-25 | Allgon Ab | A portable radio communication device and an antenna device therefor including a top capacitance |
| WO2000030208A1 (en) * | 1998-11-13 | 2000-05-25 | Allgon Ab | A matched antenna device and a portable radio communication device including a matched antenna device |
| US6633262B1 (en) | 2000-06-01 | 2003-10-14 | Mitsubishi Denki Kabushiki Kaisha | Portable wireless terminal |
| US6768464B1 (en) | 2000-06-01 | 2004-07-27 | Mitsubishi Denki Kabushiki Kaisha | Antenna element and portable information terminal |
| KR100500434B1 (en) * | 2002-04-10 | 2005-07-14 | 주식회사 선우커뮤니케이션 | The antenna using compact size meander and planar inverted F-type in mobile communication terminals |
| KR20040019781A (en) * | 2002-08-29 | 2004-03-06 | (주) 코산아이엔티 | Antenna assembling structure of mobile communication terminal for multi band |
| CN100397703C (en) * | 2004-06-22 | 2008-06-25 | 明基电通股份有限公司 | Antenna device |
| CN103259080A (en) * | 2012-02-15 | 2013-08-21 | 摩托罗拉解决方案公司 | Hybrid antenna for portable communication devices |
| US9209520B2 (en) | 2012-02-15 | 2015-12-08 | Motorola Solutions, Inc. | Hybrid antenna for portable communication devices |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3259411B2 (en) | 2002-02-25 |
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