JPH1168456A - Surface mounting antenna - Google Patents
Surface mounting antennaInfo
- Publication number
- JPH1168456A JPH1168456A JP22260697A JP22260697A JPH1168456A JP H1168456 A JPH1168456 A JP H1168456A JP 22260697 A JP22260697 A JP 22260697A JP 22260697 A JP22260697 A JP 22260697A JP H1168456 A JPH1168456 A JP H1168456A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- line
- base
- switching
- radiation
- 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
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Landscapes
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
- Support Of Aerials (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、携帯電話等の移動
体通信機器、無線ＬＡＮに用いられる表面実装型アンテ
ナに関する。[0001] 1. Field of the Invention [0002] The present invention relates to a surface mount antenna used for mobile communication equipment such as a portable telephone and a wireless LAN.
【０００２】[0002]
【従来の技術】従来の表面実装型アンテナとして、特開
平９−９８０１５号に開示されたものを例に取り、その
構成を図９を用いて説明する。2. Description of the Related Art An example of a conventional surface mount antenna disclosed in Japanese Patent Application Laid-Open No. 9-98015 will be described with reference to FIG.
【０００３】図９において、４１は表面実装型アンテナ
であり、誘電体もしくは磁性体からなる基体４２の表面
に、マイクロストリップラインからなる放射電極４３、
接地電極４４、および給電電極４５が形成されてなるも
のである。ここで、放射電極４３の一端は、基体４２の
一方主面４２ａにおいて開放端４３ａを形成し、他端は
基体４２の他方主面４２ｂに延び、同面に形成された接
地電極４４に接続されている。また、給電電極４５の一
端は、基体４２の一方主面４２ａにおいて、放射電極４
３の開放端４３ａに近接して配置されている。また、給
電電極４５の他端は、基体４２の他方主面４２ｂに延
び、接地電極４４に対して、基体４２の素地を介して配
置されることにより、接地電極４４から電気的に絶縁さ
れている。次に、このように構成される表面実装型アン
テナ４１の動作を、図１０を用いて説明する。[0003] In FIG. 9, reference numeral 41 denotes a surface-mounted antenna. A radiation electrode 43 made of a microstrip line is provided on a surface of a base 42 made of a dielectric or magnetic material.
The ground electrode 44 and the power supply electrode 45 are formed. Here, one end of the radiation electrode 43 forms an open end 43a on one main surface 42a of the base 42, and the other end extends to the other main surface 42b of the base 42 and is connected to a ground electrode 44 formed on the same surface. ing. One end of the power supply electrode 45 is connected to the radiation electrode 4 on one main surface 42 a of the base 42.
3 is disposed adjacent to the open end 43a. The other end of the power supply electrode 45 extends to the other main surface 42 b of the base 42 and is electrically insulated from the ground electrode 44 by being disposed with respect to the ground electrode 44 via the base of the base 42. I have. Next, the operation of the surface-mounted antenna 41 configured as described above will be described with reference to FIG.
【０００４】図１０において、ｆ１は高周波信号源、Ｃ
１０は放射電極４３の開放端４３ａと給電電極４５との
間に発生する容量、Ｌ６は放射電極４３を構成するマイ
クロストリップライン、Ｒ３は放射抵抗である。ここ
で、高周波信号源ｆ１から給電電極４５に印加された高
周波信号は、容量Ｃ１０により、放射電極４３と電磁界
結合し、電波となって放射される。In FIG. 10, f1 is a high frequency signal source, C
Reference numeral 10 denotes a capacitance generated between the open end 43a of the radiation electrode 43 and the feeding electrode 45, L6 denotes a microstrip line constituting the radiation electrode 43, and R3 denotes a radiation resistance. Here, the high-frequency signal applied to the power supply electrode 45 from the high-frequency signal source f1 is electromagnetically coupled to the radiation electrode 43 by the capacitor C10, and is radiated as a radio wave.
【０００５】[0005]
【発明が解決しようとする課題】ところが、従来の表面
実装型アンテナ４１においては、主として、基体４２を
構成する誘電体もしくは磁性体の誘電率、ならびに放射
電極４３の長さ寸法および幅寸法により共振周波数が規
定されるため、複数の共振周波数が得られないという問
題点があった。However, in the conventional surface mount antenna 41, the resonance mainly depends on the dielectric constant of the dielectric or magnetic material constituting the base 42 and the length and width of the radiation electrode 43. Since the frequency is specified, there is a problem that a plurality of resonance frequencies cannot be obtained.
【０００６】そこで、本発明においては、複数の共振周
波数が得られる表面実装型アンテナを提供することを目
的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a surface mount antenna capable of obtaining a plurality of resonance frequencies.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
め、本発明においては、誘電体または磁性体からなる基
体、該基体の表面に設けられる放射電極、接地電極、お
よび給電電極を備え、前記放射電極の一端が開放端を形
成し、他端が前記接地電極に接続され、前記放射電極の
開放端と、前記給電電極の一端とが互いに近接して配置
されてなる表面実装型アンテナにおいて、前記基体の表
面上に、インダクタンス成分または容量成分を変化さ
せ、共振周波数を切り換えるための周波数切換手段を設
けたことを特徴とする。In order to achieve the above object, the present invention comprises a substrate made of a dielectric or magnetic material, a radiation electrode, a ground electrode, and a power supply electrode provided on the surface of the substrate. One end of the radiation electrode forms an open end, the other end is connected to the ground electrode, and the open end of the radiation electrode and one end of the feed electrode are arranged close to each other. A frequency switching means for changing an inductance component or a capacitance component and switching a resonance frequency is provided on a surface of the base.
【０００８】また、前記放射電極は、前記基体の一方主
面に設けられたマイクロストリップラインからなる第１
の線路、第２の線路、および第３の線路から構成され、
前記第１の線路の一端は開放端を形成し、前記第２の線
路の一端は、前記第１の線路の他端近傍に配置され、前
記第３の線路は、前記第２の線路に連続して一体に形成
され、前記接地電極は、前記基体の他方主面に設けら
れ、前記周波数切換手段は、前記第１の線路の他端、お
よび前記第２の線路の一端に接続されるチップ部品から
なる半導体素子と、該半導体素子に所定の領域の電圧を
切り換えて印加するための切換電極とを備えることを特
徴とする。[0008] Further, the radiating electrode is a first strip made of a microstrip line provided on one main surface of the base.
, A second line, and a third line,
One end of the first line forms an open end, one end of the second line is disposed near the other end of the first line, and the third line is continuous with the second line. The ground electrode is provided on the other main surface of the base, and the frequency switching means is connected to the other end of the first line and one end of the second line. The semiconductor device is characterized by comprising a semiconductor element comprising a component and a switching electrode for switching and applying a voltage in a predetermined region to the semiconductor element.
【０００９】また、前記放射電極はストリップラインか
らなり、前記接地電極は、互いに別体に形成される第１
の接地電極および第２の接地電極からなり、前記第１の
接地電極の一端は前記放射電極の開放端に近接して配置
され、前記第２の接地電極は、前記放射電極の一部に連
続して一体に形成され、前記周波数切換手段は、前記第
１の接地電極および前記放射電極の開放端に接続される
チップ部品からなる可変容量素子と、該可変容量素子に
所定の領域の電圧を切り換えて印加するための切換電極
とを備えることを特徴とする。Further, the radiation electrode is formed of a strip line, and the ground electrode is formed as a first member formed separately from each other.
And a second ground electrode, one end of the first ground electrode is arranged close to an open end of the radiation electrode, and the second ground electrode is connected to a part of the radiation electrode. The frequency switching means is formed integrally with the variable capacitance element including a chip component connected to the open ends of the first ground electrode and the radiation electrode, and applies a voltage of a predetermined region to the variable capacitance element. And a switching electrode for switching and applying.
【００１０】本発明にかかる表面実装型アンテナにおい
ては、外部から、周波数切換手段を構成する切換電極を
介して、所定の領域の電圧を切り換えて半導体素子に印
加することにより、半導体素子をオン／オフさせること
ができる。そして、半導体素子のオフ時には、放射電極
を構成する第１乃至第３の線路が互いに導通し、半導体
素子のオン時には、第１および第２の線路のみが互いに
導通することとなる。このように、半導体素子のオフ／
オフを切り換えることにより、放射電極のうち、実際に
使用する部分の長さ寸法を変化させ、アンテナの共振周
波数を規定するインダクタンス成分を調整することがで
きる。これにより、複数の共振周波数を実現することが
できる。In the surface mount antenna according to the present invention, a voltage in a predetermined area is switched from outside and applied to the semiconductor element via a switching electrode constituting frequency switching means, thereby turning on / off the semiconductor element. Can be turned off. When the semiconductor element is turned off, the first to third lines forming the radiation electrode conduct with each other, and when the semiconductor element is turned on, only the first and second lines conduct with each other. Thus, the off / off of the semiconductor element
By switching off, the length of the portion of the radiation electrode that is actually used can be changed, and the inductance component that defines the resonance frequency of the antenna can be adjusted. Thereby, a plurality of resonance frequencies can be realized.
【００１１】また、本発明にかかる表面実装型アンテナ
においては、外部から、周波数切換手段を構成する切換
電極を介して、所定の領域の電圧を切り換えて可変容量
素子に印加することにより、可変容量素子の容量を変化
させることができる。これにより、アンテナの共振周波
数を規定する容量成分を変化させ、複数の共振周波数を
実現することができる。Further, in the surface mount antenna according to the present invention, the voltage in the predetermined area is switched from the outside via the switching electrode constituting the frequency switching means and applied to the variable capacitance element to thereby provide the variable capacitance. The capacitance of the element can be changed. Thereby, a plurality of resonance frequencies can be realized by changing the capacitance component defining the resonance frequency of the antenna.
【００１２】また、本発明にかかる表面実装型アンテナ
においては、周波数切換手段が基体の表面に設けられて
いるため、表面実装型アンテナとは別体の周波数切換手
段を設ける必要がなく、表面実装型アンテナを備える装
置全体の小型化に寄与するものである。Further, in the surface mount antenna according to the present invention, since the frequency switching means is provided on the surface of the base, there is no need to provide a frequency switching means separate from the surface mount antenna. This contributes to downsizing of the entire device including the antenna.
【００１３】[0013]
【発明の実施の形態】本発明の第１の実施例にかかる表
面実装型アンテナの構成を、図１を用いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A configuration of a surface mount antenna according to a first embodiment of the present invention will be described with reference to FIG.
【００１４】図１において、１は表面実装型アンテナで
あり、セラミックス、樹脂等の誘電体を直方体状に成形
してなる基体２の表面に、放射電極３、接地電極４、給
電電極５、および周波数切換手段６を設けてなる。な
お、基体２は、誘電体でなく磁性体からなるものでもよ
い。In FIG. 1, reference numeral 1 denotes a surface-mounted antenna, on a surface of a base 2 formed by molding a dielectric such as ceramics or resin into a rectangular parallelepiped, a radiation electrode 3, a ground electrode 4, a feed electrode 5, and Frequency switching means 6 is provided. The base 2 may be made of a magnetic material instead of a dielectric material.
【００１５】ここで、放射電極３は、基体２の一方主面
２ａに、互いに別体に形成されるマイクロストリップラ
インからなる第１の線路３ａ、第２の線路３ｂ、および
第３の線路３ｃから構成される。このうち、第１の線路
３ａの一端は、開放端３ａ１を形成しており、他端に
は、基体２の一方主面２ａの略中央に延びる延在部３ａ
２が形成される。また、第２の線路３ｂは、第１の線路
３ａの延長上に配置され、一端が第１の線路３ａの他端
に近接している。また、第２の線路３ｂの他端は、基体
２の端面２ｃを経由して他方主面２ｂに延びている。ま
た、第３の線路３ｃは、延在部３ｃ１を有しており、こ
の延在部３ｃ１を介して第２の線路３ｂの一端近傍に連
続し、第２の線路３ｂと一体に形成される。Here, the radiation electrode 3 is formed on one main surface 2a of the base 2 by a first line 3a, a second line 3b, and a third line 3c formed of microstrip lines formed separately from each other. Consists of One end of the first line 3a forms an open end 3a1, and the other end has an extension 3a extending substantially at the center of the one main surface 2a of the base 2.
2 are formed. The second line 3b is disposed on an extension of the first line 3a, and has one end close to the other end of the first line 3a. The other end of the second line 3b extends to the other main surface 2b via the end surface 2c of the base 2. Further, the third line 3c has an extension 3c1. The third line 3c is continuous with one end of the second line 3b via the extension 3c1, and is formed integrally with the second line 3b. .
【００１６】また、接地電極４は、基体２の他方主面２
ｂのほぼ全面に形成され、放射電極３の第２の線路３ｂ
の他端に連続し、第２の線路３ｂと一体に形成される。The ground electrode 4 is connected to the other main surface 2 of the base 2.
b, the second line 3b of the radiation electrode 3
And is formed integrally with the second line 3b.
【００１７】また、給電電極５は、基体２の一方主面２
ａ、端面２ｄおよび他方主面２ｂに亘って略コ字状に形
成される。給電電極５の一端は、基体２の一方主面２ａ
において、放射電極３の開放端３ａ１に近接している。
また、他端は、基体２の他方主面２ｂにおいて、接地電
極４に対して、基体２の素地を介して配置されることに
より、接地電極４から電気的に絶縁されている。The power supply electrode 5 is provided on one main surface 2 of the base 2.
a, the end face 2d and the other main face 2b are formed in a substantially U-shape. One end of the power supply electrode 5 is connected to one main surface 2 a of the base 2.
, Is close to the open end 3a1 of the radiation electrode 3.
The other end is electrically insulated from the ground electrode 4 by being disposed on the other main surface 2 b of the base 2 with respect to the ground electrode 4 via the base of the base 2.
【００１８】また、周波数切換手段６は、切換電極７、
チョーク用の抵抗８、半導体素子としてのダイオード
９、およびバイパス用のコンデンサ１０からなる。この
うち、抵抗８、ダイオード９、およびコンデンサ１０
は、それぞれチップ部品からなる。なお、半導体素子と
して、ダイオード以外に例えば、トランジスタ、または
ＦＥＴ等の素子を用いてもよい。The frequency switching means 6 includes a switching electrode 7,
It comprises a resistor 8 for choke, a diode 9 as a semiconductor element, and a capacitor 10 for bypass. Among them, the resistor 8, the diode 9, and the capacitor 10
Consists of chip components. Note that, as the semiconductor element, for example, an element such as a transistor or an FET may be used instead of the diode.
【００１９】ここで、切換電極７は、基体２の一方主面
２ａ上の放射電極３の開放端３ａ１近傍から、基体２の
側面２ｅを経由して他方主面２ｂに至り、接地電極４に
対して、基体２の素地を介して配置されることにより、
接地電極４から電気的に絶縁されている。また、抵抗８
は、放射電極３の第１の線路３ａの開放端３ａ１側と切
換電極７との間に配置され、第１の線路３ａと切換電極
７とを接続している。また、ダイオード９は、放射電極
３を構成する第１、第２の線路３ａ、３ｂ間に配置さ
れ、これら２つの線路を接続している。また、コンデン
サ１０は、第１の線路３ａの延在部３ａ２と、第３の線
路３ｃとの間に配置され、これら２つの線路を接続して
いる。Here, the switching electrode 7 extends from the vicinity of the open end 3a1 of the radiation electrode 3 on one main surface 2a of the base 2 to the other main surface 2b via the side surface 2e of the base 2 and to the ground electrode 4. On the other hand, by being arranged via the base of the base 2,
It is electrically insulated from the ground electrode 4. The resistance 8
Is disposed between the switching electrode 7 and the open end 3a1 side of the first line 3a of the radiation electrode 3, and connects the first line 3a and the switching electrode 7. The diode 9 is disposed between the first and second lines 3a and 3b constituting the radiation electrode 3, and connects these two lines. The capacitor 10 is arranged between the extension 3a2 of the first line 3a and the third line 3c, and connects these two lines.
【００２０】このように構成される表面実装型アンテナ
１は、とくに図示しないが、回路配線基板に実装され、
切換電極７がセット側の電圧制御機構に接続されて用い
られる。Although not shown, the surface mount antenna 1 configured as described above is mounted on a circuit wiring board.
The switching electrode 7 is used by being connected to a voltage control mechanism on the set side.
【００２１】次に、表面実装型アンテナ１の動作を、図
２を用いて説明する。Next, the operation of the surface mount antenna 1 will be described with reference to FIG.
【００２２】図２において、ｆは高周波信号源であり、
Ｃ１は放射電極３の開放端３ａ１と給電電極５との間に
発生する容量、Ｃ２は接地電極４と給電電極５との間に
発生する容量、Ｃ３は放射電極３の第１の線路３ａの開
放端３ａ１と接地電極４との間に発生する容量である。
また、Ｒ１は、抵抗８による抵抗であり、Ｃ４は、表面
実装型アンテナ１が実装される回路配線基板上に設けら
れるバイパス用コンデンサ（図示せず）による容量であ
る。また、Ｌ１、Ｌ２、Ｌ３は、それぞれ第１乃至第３
の線路３ａ、３ｂ、３ｃを構成するマイクロストリップ
ラインであり、Ｃ５はコンデンサ１０による容量であ
る。また、周波数切換手段６を構成するダイオード９
は、第１、第２の線路３ａ、３ｂ間に直列に接続される
とともに、第３の線路３ｃは、第１、第２の線路３ａ、
３ｂ間に接続され、かつ、ダイオード９に対して並列に
接続される。そして、高周波信号源ｆから給電電極５に
印加された高周波信号は、容量Ｃ１により、放射電極３
と電磁界結合し、電波となって放射される。In FIG. 2, f is a high-frequency signal source,
C1 is a capacitance generated between the open end 3a1 of the radiation electrode 3 and the power supply electrode 5, C2 is a capacitance generated between the ground electrode 4 and the power supply electrode 5, and C3 is a capacitance of the first line 3a of the radiation electrode 3. This is a capacitance generated between the open end 3a1 and the ground electrode 4.
R1 is the resistance of the resistor 8, and C4 is the capacitance of a bypass capacitor (not shown) provided on the circuit wiring board on which the surface mount antenna 1 is mounted. L1, L2, and L3 are first to third, respectively.
Are the microstrip lines constituting the lines 3a, 3b and 3c, and C5 is the capacitance of the capacitor 10. Also, a diode 9 constituting the frequency switching means 6
Is connected in series between the first and second lines 3a and 3b, and the third line 3c is connected to the first and second lines 3a and 3b.
3b, and connected in parallel with the diode 9. The high-frequency signal applied from the high-frequency signal source f to the power supply electrode 5 is supplied to the radiation electrode 3 by the capacitor C1.
Is electromagnetically coupled, and is emitted as a radio wave.
【００２３】ここで、セット側の電圧制御機構（図示せ
ず）から、表面実装型アンテナ１の周波数切換手段６を
構成する切換電極７を介して、ダイオード９に対して電
圧が印加され、この入力電圧の値が調整されることによ
り、ダイオード９がオン／オフする。ダイオード９のオ
フ時には、放射電極３を構成する第１乃至第３の線路３
ａ、３ｂ、３ｃが互いに導通し、表面実装型アンテナ１
のインダクタンス成分は、マイクロストリップラインＬ
１乃至Ｌ３により形成される。一方、ダイオード９のオ
ン時には、第１の線路３ａおよび第２の線路３ｂのみが
導通し、表面実装型アンテナ１のインダクタンス成分
は、マイクロストリップラインＬ１およびＬ２により形
成される。このように、ダイオード９をオン／オフさ
せ、アンテナの共振周波数を規定するインダクタンス成
分を変化させることにより、複数の共振周波数を実現す
ることができる。Here, a voltage is applied from a voltage control mechanism (not shown) on the set side to the diode 9 via the switching electrode 7 constituting the frequency switching means 6 of the surface-mount type antenna 1. The diode 9 is turned on / off by adjusting the value of the input voltage. When the diode 9 is turned off, the first to third lines 3 forming the radiation electrode 3
a, 3b, 3c are electrically connected to each other, and the surface-mounted antenna 1
Of the microstrip line L
1 to L3. On the other hand, when the diode 9 is turned on, only the first line 3a and the second line 3b conduct, and the inductance component of the surface mount antenna 1 is formed by the microstrip lines L1 and L2. As described above, by turning on / off the diode 9 and changing the inductance component that defines the resonance frequency of the antenna, a plurality of resonance frequencies can be realized.
【００２４】なお、基体２の表面に設ける各電極の形
状、ならびに、各電極および各チップ部品の配置は、こ
れら各電極間、もしくは各電極と各チップ部品との接続
関係を変えない限り、上記実施例で示したものに限定さ
れるものではない。例えば、図３に示すように、基体２
の端面２ｄにおいて、放射電極３の第１の線路３ａの開
放端３ａ１と給電電極５とを対向配置してもよい。ま
た、図４に示すように、放射電極３の第１の線路３ａ
を、基体２の一方主面２ａ上で直角状に屈曲させるとと
もに、第１の線路３ａの形状に応じて、給電電極５、切
換電極７、および抵抗８の基体２における形成位置を変
えてもよい。The shape of each electrode provided on the surface of the base 2 and the arrangement of each electrode and each chip component are the same as those described above unless the connection relationship between these electrodes or between each electrode and each chip component is changed. The present invention is not limited to those shown in the embodiments. For example, as shown in FIG.
In the end face 2d, the open end 3a1 of the first line 3a of the radiation electrode 3 and the feed electrode 5 may be arranged to face each other. Also, as shown in FIG. 4, the first line 3a of the radiation electrode 3
May be bent at a right angle on one main surface 2a of the base 2 and the positions of the power supply electrode 5, the switching electrode 7, and the resistor 8 formed on the base 2 may be changed according to the shape of the first line 3a. Good.
【００２５】次に、本発明の第２の実施例にかかる表面
実装型アンテナの構成を図５を用いて説明する。なお、
第１の実施例と同一もしくは相当する部分には同一の符
号を付し、その説明は省略する。Next, the configuration of a surface mount antenna according to a second embodiment of the present invention will be described with reference to FIG. In addition,
The same or corresponding parts as in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
【００２６】図５において、２１は表面実装型アンテナ
であり、基体２の表面に放射電極２３、接地電極２４、
給電電極２５、および周波数切換手段２６を設けてなる
ものである。In FIG. 5, reference numeral 21 denotes a surface-mounted antenna, and a radiation electrode 23, a ground electrode 24,
It is provided with a power supply electrode 25 and frequency switching means 26.
【００２７】ここで、放射電極２３は、第１の放射電極
２３ａおよび第２の放射電極２３ｂからなる。このう
ち、第１の放射電極２３ａの一端は、基体２の一方主面
２ａの端面２ｃに接する端縁近傍において、開放端２３
ａ１を形成し、他端は、一方主面２ａの側面２ｆに接す
る端縁の略中央近傍まで延びている。また、第２の放射
電極２３ｂは、一端が、第１の放射電極２３ａの他端に
対向配置されており、基体２の一方主面２ａにおいて略
Ｌ字状に屈曲し、他端が側面２ｅに延びている。また、
接地電極２４は、第１の接地電極２４ａおよび第２の接
地電極２４ｂからなる。このうち、第１の接地電極２４
ａの一端は、基体２の一方主面２ａにおいて、放射電極
２３を構成する第１の放射電極２３ａの開放端２３ａ１
に近接して配置されており、他端は、基体２の側面２ｅ
を経由して他方主面２ｂまで延びている。また、第２の
接地電極２４ｂは基体２の側面２ｅに形成され、一端
が、放射電極２３を構成する第２の放射電極２３ｂに接
続され、他端が基体２の他方主面２ｂまで延びている。Here, the radiation electrode 23 includes a first radiation electrode 23a and a second radiation electrode 23b. Among them, one end of the first radiation electrode 23a is connected to the open end 23 near the edge contacting the end face 2c of the one main surface 2a of the base 2.
a1 is formed, and the other end extends to near the approximate center of an edge contacting the side surface 2f of the one main surface 2a. One end of the second radiation electrode 23b is disposed to face the other end of the first radiation electrode 23a, and is bent substantially in an L shape on one main surface 2a of the base 2, and the other end is formed on the side surface 2e. Extends to. Also,
The ground electrode 24 includes a first ground electrode 24a and a second ground electrode 24b. Among them, the first ground electrode 24
a one end of the first radiation electrode 23 a constituting the radiation electrode 23 on one main surface 2 a of the base 2.
And the other end is connected to the side surface 2 e of the base 2.
Extends to the other main surface 2b. The second ground electrode 24 b is formed on the side surface 2 e of the base 2, one end is connected to the second radiation electrode 23 b constituting the radiation electrode 23, and the other end extends to the other main surface 2 b of the base 2. I have.
【００２８】また、給電電極２５は、接地電極２４より
基体２の内方寄りに、接地電極２４に隣接して形成され
ており、一端が、基体２の一方主面２ａの放射電極２３
の開放端２３ａ１近傍に配置され、他端が、側面２ｅを
経由して他方主面２ｂまで延びている。The power supply electrode 25 is formed closer to the inside of the base 2 than the ground electrode 24 and adjacent to the ground electrode 24, and has one end connected to the radiation electrode 23 on the one main surface 2 a of the base 2.
Is disposed near the open end 23a1, and the other end extends to the other main surface 2b via the side surface 2e.
【００２９】また、周波数切換手段２６は、切換電極２
７、チョーク用の抵抗２８、可変容量素子としての可変
容量ダイオード２９、およびＤＣカット用のコンデンサ
３０からなる。このうち、抵抗２８、可変容量ダイオー
ド２９、およびコンデンサ３０は、それぞれチップ部品
からなる。なお、可変容量素子として、可変容量ダイオ
ード以外の素子を用いてもよい。Further, the frequency switching means 26 includes the switching electrode 2
7, a choke resistor 28, a variable capacitance diode 29 as a variable capacitance element, and a DC cut capacitor 30. Among these, the resistor 28, the variable capacitance diode 29, and the capacitor 30 are each formed of a chip component. Note that an element other than the variable capacitance diode may be used as the variable capacitance element.
【００３０】ここで、切換電極２７は第１の切換電極２
７ａおよび第２の切換電極２７ｂからなり、このうち、
第１の切換電極２７ａの一端は、基体２の一方主面２ａ
の略中央に配置され、他端は、基体２の側面２ｅを経由
して他方主面２ｂまで延びている。また、第２の切換電
極２７ｂは、第１の切換電極２７ａの延長上に形成され
ており、一端が、第１の切換電極２７ａの一端に対向配
置され、他端が、放射電極２３を構成する第１の放射電
極２３ａに接続されている。また、抵抗２８は、切換電
極２７を構成する第１の切換電極２７ａおよび第２の切
換電極２７ｂ間に配置され、第１の切換電極２７ａと第
２の切換電極２７ｂとを接続している。また、可変容量
ダイオード２９は、放射電極２３の開放端２３ａ１と、
接地電極２４を構成する第１の接地電極２４ａの一端と
の間に配置され、放射電極２３と接地電極２４とを接続
している。また、コンデンサ３０は、放射電極２３を構
成する第１の放射電極２３ａの他端と、第２の放射電極
２３ｂの一端との間に配置され、第１の放射電極２３ａ
と第２の放射電極２３ｂとを接続している。Here, the switching electrode 27 is the first switching electrode 2
7a and a second switching electrode 27b.
One end of the first switching electrode 27a is connected to one main surface 2a of the base 2.
, And the other end extends to the other main surface 2 b via the side surface 2 e of the base 2. The second switching electrode 27b is formed on an extension of the first switching electrode 27a. One end of the second switching electrode 27b faces the one end of the first switching electrode 27a, and the other end constitutes the radiation electrode 23. Connected to the first radiating electrode 23a. Further, the resistor 28 is arranged between the first switching electrode 27a and the second switching electrode 27b constituting the switching electrode 27, and connects the first switching electrode 27a and the second switching electrode 27b. In addition, the variable capacitance diode 29 includes an open end 23a1 of the radiation electrode 23,
It is arranged between one end of a first ground electrode 24a constituting the ground electrode 24 and connects the radiation electrode 23 and the ground electrode 24. The capacitor 30 is disposed between the other end of the first radiation electrode 23a forming the radiation electrode 23 and one end of the second radiation electrode 23b.
And the second radiation electrode 23b.
【００３１】このように構成される表面実装型アンテナ
２１は、とくに図示しないが、回路配線基板に実装さ
れ、切換電極２７を構成する第１の切換電極２７ａがセ
ット側の電圧制御機構に接続されて用いられる。Although not shown, the surface-mounted antenna 21 configured as described above is mounted on a circuit wiring board, and the first switching electrode 27a constituting the switching electrode 27 is connected to the set-side voltage control mechanism. Used.
【００３２】次に、表面実装型アンテナ２１の動作を、
図６を用いて説明する。Next, the operation of the surface mount antenna 21 will be described.
This will be described with reference to FIG.
【００３３】図６において、ｆは高周波信号源であり、
Ｃ６は放射電極２３の開放端２３ａ１と給電電極２５と
の間に発生する容量、Ｃ７は放射電極２３の開放端２３
ａ１と接地電極２４との間に発生する容量である。ま
た、ＶＣは可変容量ダイオード２９による可変容量であ
る。また、Ｒ２は、抵抗２８による抵抗であり、Ｃ８
は、表面実装型アンテナ２１が実装される回路配線基板
上に設けられるバイパス用コンデンサ（図示せず）によ
る容量である。また、Ｌ４は第１の放射電極２３ａによ
るインダクタンス、Ｌ５は第２の放射電極２３ｂによる
インダクタンスであり、Ｃ９はコンデンサ３０による容
量である。そして、高周波信号源ｆから給電電極２５に
印加された高周波信号は、容量Ｃ６により、放射電極２
３と電磁界結合し、電波となって放射される。In FIG. 6, f is a high-frequency signal source,
C6 is a capacitance generated between the open end 23a1 of the radiation electrode 23 and the power supply electrode 25, and C7 is an open end 23a of the radiation electrode 23.
This is a capacitance generated between a1 and the ground electrode 24. VC is a variable capacitance of the variable capacitance diode 29. R2 is a resistance of the resistor 28, and C8
Is a capacitance of a bypass capacitor (not shown) provided on a circuit wiring board on which the surface mount antenna 21 is mounted. L4 is the inductance of the first radiation electrode 23a, L5 is the inductance of the second radiation electrode 23b, and C9 is the capacitance of the capacitor 30. The high-frequency signal applied from the high-frequency signal source f to the power supply electrode 25 is supplied to the radiation electrode 2 by the capacitor C6.
3 and is radiated as radio waves.
【００３４】ここで、セット側の電圧制御機構から、表
面実装型アンテナ２１の周波数切換手段２６を構成する
切換電極２７を介して、可変容量ダイオード２９に対し
て電圧が印加され、この入力電圧の値が調整されること
により、可変容量ダイオード２９による容量が増減す
る。このように、アンテナの共振周波数を規定する容量
成分を変化させることにより、複数の共振周波数を実現
することができる。Here, a voltage is applied to the variable capacitance diode 29 from the set-side voltage control mechanism via the switching electrode 27 constituting the frequency switching means 26 of the surface-mount type antenna 21, and this input voltage is controlled. By adjusting the value, the capacitance of the variable capacitance diode 29 increases or decreases. Thus, a plurality of resonance frequencies can be realized by changing the capacitance component that defines the resonance frequency of the antenna.
【００３５】なお、基体２の表面に設ける各電極の形
状、ならびに、各電極および各チップ部品の配置は、こ
れら各電極間、もしくは各電極と各チップ部品との接続
関係を変えない限り、上記実施例で示したものに限定さ
れるものではない。例えば、図７に示すように、コンデ
ンサ３０を基体２の側面２ｆに配置するとともに、各電
極を側面２ｆに延在させてもよい。また、図８に示すよ
うに、第１の放射電極２３ａを、基体２の端面２ｃを迂
回させて形成してもよい。The shape of each electrode provided on the surface of the base 2 and the arrangement of each electrode and each chip component are the same as those described above, unless the connection relationship between these electrodes or the connection between each electrode and each chip component is changed. The present invention is not limited to those shown in the embodiments. For example, as shown in FIG. 7, the capacitor 30 may be arranged on the side surface 2f of the base 2 and each electrode may extend on the side surface 2f. Further, as shown in FIG. 8, the first radiation electrode 23a may be formed so as to bypass the end face 2c of the base 2.
【００３６】[0036]
【発明の効果】本発明にかかる表面実装型アンテナにお
いては、外部から、周波数切換手段を構成する切換電極
を介して、所定の領域の電圧を切り換えて半導体素子に
印加することにより、半導体素子をオン／オフさせるこ
とができる。そして、半導体素子のオフ時には、放射電
極を構成する第１乃至第３の線路が互いに導通し、半導
体素子のオン時には、第１および第２の線路のみが互い
に導通することとなる。このように、半導体素子のオフ
／オフを切り換えることにより、放射電極のうち、実際
に使用する部分の長さ寸法を変化させ、アンテナの共振
周波数を規定するインダクタンス成分を調整することが
できる。これにより、複数の共振周波数を有する表面実
装型アンテナを提供することができる。In the surface mount antenna according to the present invention, the voltage of a predetermined region is switched from the outside and applied to the semiconductor element through the switching electrode constituting the frequency switching means, so that the semiconductor element is mounted. Can be turned on / off. When the semiconductor element is turned off, the first to third lines forming the radiation electrode conduct with each other, and when the semiconductor element is turned on, only the first and second lines conduct with each other. Thus, by switching off / off of the semiconductor element, it is possible to change the length dimension of a part of the radiation electrode that is actually used, and to adjust the inductance component that defines the resonance frequency of the antenna. Thereby, a surface mount antenna having a plurality of resonance frequencies can be provided.
【００３７】また、本発明にかかる表面実装型アンテナ
においては、外部から、周波数切換手段を構成する切換
電極を介して、所定の領域の電圧を切り換えて可変容量
素子に印加することにより、可変容量素子の容量を変化
させることができる。これにより、アンテナの共振周波
数を規定する容量成分を変化させ、複数の共振周波数を
有する表面実装型アンテナを提供することができる。Further, in the surface mount antenna according to the present invention, the voltage in the predetermined area is switched from the outside via the switching electrode constituting the frequency switching means and applied to the variable capacitance element, thereby providing the variable capacitance. The capacitance of the element can be changed. This makes it possible to provide a surface mount antenna having a plurality of resonance frequencies by changing the capacitance component defining the resonance frequency of the antenna.
【００３８】また、本発明にかかる表面実装型アンテナ
においては、周波数切換手段が基体の表面に設けられて
いるため、表面実装型アンテナとは別体の周波数切換手
段を設ける必要がなく、表面実装型アンテナを備える装
置全体の小型化に寄与するものである。Further, in the surface mount antenna according to the present invention, since the frequency switching means is provided on the surface of the base, there is no need to provide a frequency switching means separate from the surface mount antenna. This contributes to downsizing of the entire device including the antenna.
【図１】本発明の第１の実施例にかかる表面実装型アン
テナを示す透視斜視図である。FIG. 1 is a perspective view showing a surface mount antenna according to a first embodiment of the present invention.
【図２】図１の表面実装型アンテナの等価回路図であ
る。FIG. 2 is an equivalent circuit diagram of the surface mount antenna of FIG.
【図３】図１の表面実装型アンテナの変形例を示す要部
斜視図である。FIG. 3 is a perspective view of a main part showing a modification of the surface mount antenna of FIG. 1;
【図４】図１の表面実装型アンテナの他の変形例を示す
要部斜視図である。FIG. 4 is a perspective view of a relevant part showing another modification of the surface mount antenna of FIG. 1;
【図５】本発明の第２の実施例にかかる表面実装型アン
テナを示す透視斜視図である。FIG. 5 is a perspective view showing a surface mount antenna according to a second embodiment of the present invention.
【図６】図５の表面実装型アンテナの等価回路図であ
る。FIG. 6 is an equivalent circuit diagram of the surface mount antenna of FIG. 5;
【図７】図５の表面実装型アンテナの変形例を示す斜視
図である。FIG. 7 is a perspective view showing a modification of the surface mount antenna of FIG. 5;
【図８】図５の表面実装型アンテナの他の変形例を示す
要部斜視図である。8 is a main part perspective view showing another modification of the surface mount antenna of FIG. 5;
【図９】従来の表面実装型アンテナを示す透視斜視図で
ある。FIG. 9 is a perspective view showing a conventional surface mount antenna.
【図１０】図９の表面実装型アンテナの等価回路図であ
る。FIG. 10 is an equivalent circuit diagram of the surface mount antenna of FIG. 9;
１、２１ 表面実装型アンテナ ２ 基体 ２ａ 一方主面 ２ｂ 他方主面 ３、２３ 放射電極 ３ａ 第１の線路 ３ｂ 第２の線路 ３ｃ 第３の線路 ３ａ１、２３ａ１ 開放端 ４、２４ 接地電極 ２４ａ 第１の接地電極 ２４ｂ 第２の接地電極 ５、２５ 給電電極 ６、２６ 周波数切換手段 ７、２７ 切換電極 ９ ダイオード（半導体素子） ２９ 可変容量ダイオード（可変容量素子） 1, 21 Surface mount antenna 2 Base 2a One main surface 2b Other main surface 3, 23 Radiation electrode 3a First line 3b Second line 3c Third line 3a1, 23a1 Open end 4, 24 Ground electrode 24a First Ground electrode 24b Second ground electrode 5, 25 Feed electrode 6, 26 Frequency switching means 7, 27 Switching electrode 9 Diode (semiconductor element) 29 Variable capacitance diode (variable capacitance element)
Claims (3)
体の表面に設けられる放射電極、接地電極、および給電
電極を備え、前記放射電極の一端が開放端を形成し、他
端が前記接地電極に接続され、前記放射電極の開放端
と、前記給電電極の一端とが互いに近接して配置されて
なる表面実装型アンテナにおいて、 前記基体の表面上に、インダクタンス成分または容量成
分を変化させ、共振周波数を切り換えるための周波数切
換手段を設けたことを特徴とする表面実装型アンテナ。1. A base made of a dielectric or magnetic material, a radiation electrode, a ground electrode, and a power supply electrode provided on the surface of the base, one end of the radiation electrode forming an open end and the other end forming the ground. In a surface-mounted antenna connected to an electrode and having an open end of the radiation electrode and one end of the feed electrode arranged close to each other, on the surface of the base, an inductance component or a capacitance component is changed. A surface-mounted antenna comprising frequency switching means for switching a resonance frequency.
設けられたマイクロストリップラインからなる第１の線
路、第２の線路、および第３の線路から構成され、 前記第１の線路の一端は開放端を形成し、前記第２の線
路の一端は、前記第１の線路の他端近傍に配置され、前
記第３の線路は、前記第２の線路に連続して一体に形成
され、 前記接地電極は、前記基体の他方主面に設けられ、 前記周波数切換手段は、前記第１の線路の他端、および
前記第２の線路の一端に接続されるチップ部品からなる
半導体素子と、該半導体素子に所定の領域の電圧を切り
換えて印加するための切換電極とを備えることを特徴と
する請求項１に記載の表面実装型アンテナ。2. The radiating electrode includes a first line, a second line, and a third line formed of a microstrip line provided on one main surface of the base, and the radiating electrode includes a first line, a second line, and a third line. One end forms an open end, one end of the second line is disposed near the other end of the first line, and the third line is integrally formed continuously with the second line. The ground electrode is provided on the other main surface of the base; and the frequency switching means is a semiconductor element including a chip component connected to the other end of the first line and one end of the second line. 2. The surface mount antenna according to claim 1, further comprising: a switching electrode for switching and applying a voltage in a predetermined area to the semiconductor element.
り、 前記接地電極は、互いに別体に形成される第１の接地電
極および第２の接地電極からなり、前記第１の接地電極
の一端は前記放射電極の開放端に近接して配置され、前
記第２の接地電極は、前記放射電極の一部に連続して一
体に形成され、 前記周波数切換手段は、前記第１の接地電極および前記
放射電極の開放端に接続されるチップ部品からなる可変
容量素子と、該可変容量素子に所定の領域の電圧を切り
換えて印加するための切換電極とを備えることを特徴と
する請求項１に記載の表面実装型アンテナ。3. The radiation electrode comprises a strip line, the ground electrode comprises a first ground electrode and a second ground electrode formed separately from each other, and one end of the first ground electrode is The second ground electrode is disposed adjacent to the open end of the radiation electrode, the second ground electrode is formed continuously and integrally with a part of the radiation electrode, and the frequency switching unit includes the first ground electrode and the radiation 2. A variable capacitance element comprising a chip component connected to an open end of the electrode, and a switching electrode for switching and applying a voltage in a predetermined area to the variable capacitance element. Surface mount antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22260697A JPH1168456A (en) | 1997-08-19 | 1997-08-19 | Surface mounting antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22260697A JPH1168456A (en) | 1997-08-19 | 1997-08-19 | Surface mounting antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1168456A true JPH1168456A (en) | 1999-03-09 |
Family
ID=16785101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22260697A Pending JPH1168456A (en) | 1997-08-19 | 1997-08-19 | Surface mounting antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1168456A (en) |
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-
1997
- 1997-08-19 JP JP22260697A patent/JPH1168456A/en active Pending
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