JPH098537A - Plane antenna - Google Patents

Abstract

PURPOSE: To obtain a stable characteristic with ease of manufacture and to improve the radiation efficiency by using a conductor chip connecting a radiation electrode and an earth electrode without forming a conductor film in a throughhole. CONSTITUTION: A throughhole 15 is formed in the middle of a dielectric disk board 10, a radiation electrode 11 is formed around the throughhole 15 on the surface, and an earth electrode 12 is formed to a rear side of the dielectric board 10. No conductive film is formed to a wall face of the throughhole 15 so as to expose the dielectric material, and a metallic pin 14 having a part 16 whose cross section is circular is inserted to the throughhole 15. The cylindrical part 16 acts like a feeding conductor close to a wall face of the throughhole 15 and a lower end of the cylindrical part 16 is used for an impedance matching point of 50ohms. A conductor piece 17 is inserted between a side face of the cylindrical part 16 and a wall face of the throughhole 15. The conductor chip 17 connects the radiation electrode 11 and an earth 12 at the same depth as that of the throughhole 15 and the conductor piece 17 presses the side face of the metallic pin (feeding pin) 14 onto the wall face of the throughhole 15.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は超小型の水平方向無指向
性の直線偏波アンテナに係るもので、特に2.4GHz帯無線
ＬＡＮ用としてＰＣＭＣＩＡカード上への実装に適した
平面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 relates to a miniaturized horizontal omnidirectional linearly polarized antenna, and more particularly to a planar antenna suitable for mounting on a PCMCIA card for a 2.4 GHz band wireless LAN. is there.

【０００２】[0002]

【従来の技術】通信手段の一種として2.4GHz帯の周波数
を用いた無線ＬＡＮの実用化が進められており、これは
アンテナを用いて情報を伝送するものである。この周波
数帯のアンテナとしては、垂直偏波に対して水平面内で
無指向性を得るためにホイップアンテナが用いられてい
る。2. Description of the Related Art A wireless LAN using a frequency in the 2.4 GHz band is being put into practical use as a kind of communication means, and this uses an antenna to transmit information. As an antenna for this frequency band, a whip antenna is used to obtain omnidirectionality in the horizontal plane with respect to vertically polarized waves.

【０００３】このホイップアンテナは形状が大型となる
とともに取付け方法、位置等に制約があり、これを解決
するために本発明者は特願平6-276042等で貫通孔を形成
した誘電体基板を用いた薄型の平面アンテナを提案し
た。This whip antenna has a large shape and is limited in mounting method, position, etc. In order to solve this, the present inventor has proposed a dielectric substrate having a through hole in Japanese Patent Application No. 6-276042. The thin flat antenna used is proposed.

【０００４】図３はそのような平面アンテナの一例を示
す正面断面図で、誘電体基板30に貫通孔を形成し、表面
に第一の放射電極31、裏面にアース電極32を形成すると
ともに、貫通孔内に部分的に第二の放射電極33を形成し
たものである。放射電極31、33とアース電極32は短絡さ
れている。貫通孔内の50Ωの整合点に給電するために金
属ピン34を貫通孔に挿入し、整合点で第二の放射電極33
に接触するようにしている。FIG. 3 is a front sectional view showing an example of such a planar antenna. A through hole is formed in a dielectric substrate 30, a first radiation electrode 31 is formed on the front surface, and a ground electrode 32 is formed on the back surface. The second radiation electrode 33 is partially formed in the through hole. The radiation electrodes 31, 33 and the ground electrode 32 are short-circuited. A metal pin 34 is inserted into the through hole to feed the 50Ω matching point in the through hole, and the second radiation electrode 33 is inserted at the matching point.
I try to come into contact with.

【０００５】[0005]

【発明が解決しようとする課題】上記のような平面アン
テナでは、貫通孔の壁面に誘電体が露出する部分を有す
る部分電極を形成することが必要となり、導体塗布の場
合でも金属片を挿入する場合でも工数が多くなる。In the above planar antenna, it is necessary to form a partial electrode having a portion where the dielectric is exposed on the wall surface of the through hole, and a metal piece is inserted even when the conductor is applied. Even in such a case, the man-hour will increase.

【０００６】また、給電用のピンを貫通孔に挿入し、貫
通孔内部で部分的に形成された電極と接続することが必
要であり、確実で安定した接続を行うことが難しくな
る。特に、インピーダンスの整合点で接続する必要があ
り、特性の偏差が生じやすくなる。Further, it is necessary to insert a power feeding pin into the through hole and connect it to an electrode partially formed inside the through hole, which makes it difficult to make a reliable and stable connection. In particular, it is necessary to connect at the impedance matching point, and deviation of characteristics is likely to occur.

【０００７】更に、スルーホール内の放射電極が部分電
極となるので、誘電体基板の貫通孔部分の放射電極スペ
ースとしての使用効率が悪くなる。貫通孔内部を全て放
射電極として使用できれば効率は最大となる。Further, since the radiation electrode in the through hole serves as a partial electrode, the use efficiency of the through hole portion of the dielectric substrate as a radiation electrode space becomes poor. The efficiency is maximized if the entire inside of the through hole can be used as a radiation electrode.

【０００８】本発明は、上記のような課題を解決して、
製造が容易で、安定した特性が得られ、更に放射効率の
良好な平面アンテナを提供するものである。The present invention solves the above problems,
The present invention provides a planar antenna that is easy to manufacture, has stable characteristics, and has good radiation efficiency.

【０００９】[0009]

【課題を解決するための手段】本発明は、貫通孔内に導
体膜を形成せずに、放射電極とアース電極を接続する導
体片を用いることによって、上記の課題を解決するもの
である。The present invention solves the above problems by using a conductor piece for connecting a radiation electrode and an earth electrode without forming a conductor film in the through hole.

【００１０】すなわち、中央部に貫通孔を具えた誘電体
基板の表面に金属膜による放射電極、誘電体基板の裏面
に金属膜によるアース電極が設けられ、貫通孔内に放射
電極とアース電極を接続する導体片が挿入され、貫通孔
内のインピーダンス整合点よりも放射電極側で貫通孔の
壁面に近接する断面が円形の部分を具えた金属ピンが挿
入されたことに特徴を有するものである。That is, a radiation electrode made of a metal film is provided on the front surface of a dielectric substrate having a through hole in the center, and a ground electrode made of a metal film is provided on the back surface of the dielectric substrate, and the radiation electrode and the ground electrode are provided in the through hole. It is characterized in that a conductor piece to be connected is inserted, and a metal pin having a circular section is inserted near the wall surface of the through hole on the radiation electrode side with respect to the impedance matching point in the through hole. .

【００１１】[0011]

【作用】本発明による平面アンテナは金属ピンの円筒形
の導体が挿入される部分が貫通孔の壁面に導体膜が形成
されたのと同様な構造となり、また導体片によってイン
ダクタンスを介してアース電極と接続されたことにな
る。The planar antenna according to the present invention has the same structure as that in which the portion of the metal pin into which the cylindrical conductor is inserted has the conductor film formed on the wall surface of the through hole, and the conductor electrode is connected to the ground electrode via the inductance. Is connected with.

【００１２】[0012]

【実施例】以下、図面を参照して、本発明の実施例につ
いて説明する。Embodiments of the present invention will be described below with reference to the drawings.

【００１３】図１は本発明の実施例を示す（ａ）は正面
断面図、（ｂ）は底面図である。円形の誘電体基板10の
中央部に貫通孔15を形成し、表面の貫通孔の周囲に放射
電極11を形成する。誘電体基板10の裏面にはアース電極
12を形成する。これらは、導体ペーストの印刷（塗
布）、焼付によって所定のパターンで形成される。FIG. 1 shows an embodiment of the present invention, (a) is a front sectional view, and (b) is a bottom view. A through hole (15) is formed at the center of a circular dielectric substrate (10), and a radiation electrode (11) is formed around the through hole on the surface. A ground electrode is provided on the back surface of the dielectric substrate 10.
Forming twelve. These are formed in a predetermined pattern by printing (application) of a conductor paste and baking.

【００１４】誘電体基板10の貫通孔15の壁面は導体膜を
形成せず、誘電体が露出するままとしておく。そしてこ
の貫通孔に断面が円形の部分16を具えた金属ピン14を挿
入する。この円筒形の部分は、貫通孔15の壁面に近接し
て給電導体となるものである。円筒形の部分16の下端は
50Ωのインピーダンス整合点となるようにしておく。そ
の部分より下側は細く形成しておき外部回路との接続に
利用する。No conductor film is formed on the wall surface of the through hole 15 of the dielectric substrate 10 and the dielectric is left exposed. Then, a metal pin 14 having a circular section 16 is inserted into this through hole. This cylindrical portion is close to the wall surface of the through hole 15 and serves as a power supply conductor. The lower end of the cylindrical part 16 is
Make sure that the impedance matching point is 50Ω. The lower side of that portion is formed thin and used for connection with an external circuit.

【００１５】本発明による平面アンテナでは、円筒形の
部分16の側面と貫通孔15の壁面との間に導体片17を挿入
してある。この導体片17は放射電極11とアース電極12を
接続して短絡するもので貫通孔の深さ、すなわち誘電体
基板10の厚みと同じ寸法としてある。この導体片17は金
属ピン（給電ピン）の側面で貫通孔の壁面に押圧されて
いる。In the planar antenna according to the present invention, the conductor piece 17 is inserted between the side surface of the cylindrical portion 16 and the wall surface of the through hole 15. The conductor piece 17 connects the radiation electrode 11 and the ground electrode 12 to short-circuit them, and has the same dimension as the depth of the through hole, that is, the thickness of the dielectric substrate 10. The conductor piece 17 is pressed against the wall surface of the through hole by the side surface of the metal pin (power supply pin).

【００１６】図２は、導体片17の構造を示す（ａ）は正
面図、（ｂ）は底面図である。この例では円形の金属板
18から切り起こして矩形の導体片17を形成したもので、
導体片17は貫通孔の壁面に接触するよう断面を円弧状に
形成しておくとよい。2A and 2B show the structure of the conductor piece 17, wherein FIG. 2A is a front view and FIG. 2B is a bottom view. In this example a circular metal plate
A rectangular conductor piece 17 is formed by cutting and raising from 18.
The conductor piece 17 may have an arc-shaped cross section so as to contact the wall surface of the through hole.

【００１７】金属ピン14の円筒形の部分16の先端には鍔
を形成しておくとよい。放射電極側から金属ピン14を挿
入したときに位置決めができるし、放射電極との接続の
ための半田付けの作業も容易となり、また、接続を確実
に行うことができる。この金属ピンは金属板を成型した
円筒状の形状としてもよい。A collar is preferably formed at the tip of the cylindrical portion 16 of the metal pin 14. Positioning can be performed when the metal pin 14 is inserted from the radiation electrode side, soldering work for connecting to the radiation electrode can be facilitated, and the connection can be reliably performed. The metal pin may have a cylindrical shape formed by molding a metal plate.

【００１８】導体片17と一体に形成された金属板18は、
アース電極12と半田付けによって接続される。導体片17
の放射電極側の先端部分も半田付けによって放射電極と
接続される。なお、導体片17は金属板18から切り起こす
構造に限られず、溶接等によって形成したものでもよ
い。この場合、金属ピンの細く形成した先端を通す部分
に孔を形成しておく必要がある。The metal plate 18 formed integrally with the conductor piece 17 is
It is connected to the ground electrode 12 by soldering. Conductor piece 17
The tip of the radiation electrode on the side of the radiation electrode is also connected to the radiation electrode by soldering. The conductor piece 17 is not limited to the structure of being cut and raised from the metal plate 18, and may be formed by welding or the like. In this case, it is necessary to form a hole in the portion through which the thin tip of the metal pin passes.

【００１９】金属ピンの固定は、挿入後、円形の部分の
先端部分にクリーム半田を塗布してリフロー処理のみで
行うことができる。特に、貫通孔内部を半田処理するす
る必要はない。The metal pin can be fixed only by reflowing after applying cream solder to the tip of the circular portion after insertion. In particular, it is not necessary to solder the inside of the through hole.

【００２０】[0020]

【発明の効果】本発明によれば、誘電体基板の貫通孔内
に部分電極を形成する必要がなく、多くの工数を要する
導体膜の塗布、処理の作業を大幅に減少することができ
る。According to the present invention, it is not necessary to form a partial electrode in the through hole of the dielectric substrate, and the work of coating and processing the conductor film, which requires a large number of steps, can be greatly reduced.

【００２１】また、円形の金属ピンを挿入するので、イ
ンピーダンス整合点への接続が容易になるだけでなく、
中心位置を保つことも容易となり、方向による特性の偏
移を防止できる。Further, since the circular metal pin is inserted, not only the connection to the impedance matching point becomes easy, but also
It is also easy to maintain the center position, and it is possible to prevent deviation of the characteristics depending on the direction.

【００２２】更に、導体片を用いるので導体膜の場合よ
りもインピーダンスの偏差が小さくなって特性が安定す
るとともに、熱伝動が良いので半田付けを確実に行うこ
ともできる。Further, since the conductor piece is used, the deviation of the impedance is smaller than that in the case of the conductor film, the characteristic is stable, and the heat transfer is good, so that the soldering can be surely performed.

【図面の簡単な説明】[Brief description of drawings]

【図１】 本発明の実施例を示す（ａ）は正面断面図、
（ｂ）は底面図FIG. 1A is a front sectional view showing an embodiment of the present invention,
(B) is a bottom view

【図２】 本発明の実施例を示す（ａ）は正面図、
（ｂ）は底面図FIG. 2 (a) is a front view showing an embodiment of the present invention,
(B) is a bottom view

【図３】 従来の平面アンテナを示す正面断面図FIG. 3 is a front sectional view showing a conventional planar antenna.

【符号の説明】[Explanation of symbols]

10：誘電体基板 11：放射電極 12：アース電極 14：金属ピン 16：円筒形部分 17：導体片 10: Dielectric substrate 11: Radiation electrode 12: Earth electrode 14: Metal pin 16: Cylindrical part 17: Conductor piece

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 中央部に貫通孔を具えた誘電体基板の表
面に金属膜による放射電極、誘電体基板の裏面に金属膜
によるアース電極が設けられ、貫通孔内に放射電極とア
ース電極を接続する導体片が挿入され、貫通孔内のイン
ピーダンス整合点よりも放射電極側で貫通孔の壁面に近
接する断面が円形の部分を具えた給電ピンが挿入されて
なる平面アンテナ。1. A radiation electrode made of a metal film is provided on the front surface of a dielectric substrate having a through hole at the center, and a ground electrode made of a metal film is provided on the back surface of the dielectric substrate, and the radiation electrode and the ground electrode are provided in the through hole. A planar antenna in which a conductor piece to be connected is inserted, and a feeding pin having a circular cross section is inserted on the side of the radiation electrode closer to the wall surface of the through hole than the impedance matching point in the through hole. 【請求項２】 導体片が金属板と一体に形成されてアー
ス電極側から挿入された請求項１記載の平面アンテナ。2. The planar antenna according to claim 1, wherein the conductor piece is formed integrally with the metal plate and is inserted from the ground electrode side. 【請求項３】 導体片が金属板から切り起こされた請求
項２記載の平面アンテナ。3. The planar antenna according to claim 2, wherein the conductor piece is cut and raised from a metal plate. 【請求項４】 給電ピンが鍔部を具え、放射電極側から
挿入された請求項１記載の平面アンテナ。4. The planar antenna according to claim 1, wherein the feeding pin has a collar portion and is inserted from the radiation electrode side. 【請求項５】 給電ピンの断面が円形の部分が円筒状で
ある請求項１記載の平面アンテナ。5. The planar antenna according to claim 1, wherein the circular portion of the feed pin has a circular cross section.