JPH10107528A - Glass antenna system for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high reception sensitivity without a preamplifier by placing an antenna conductor and an earth conductor in parallel, connecting electrically a parallel connection circuit of a 1st coil and a capacitor between the antenna conductor and a receiver and causing 1st resonance with a stray capacitance between the 1st coil and a cable. SOLUTION: In the case of receiving a low reception frequency band, an inductance of a 1st coil 3 and a stray capacitance cause series resonance (1st resonance). An antenna conductor 1 has a stray capacitance, and an inductance of a 2nd coil 8 and a stray capacitance mainly cause apparent parallel resonance (2nd resonance). The reception sensitivity at a desired reception frequency band is improved by the two resonance phenomena and made flat. Furthermore, a capacitance of a capacitor 7 shows a low impedance at a high reception frequency band and indicates a high impedance at a low reception frequency band. Thus, a reception signal at a high reception frequency band induced in the antenna conductor 1 is fed to the receiver via the capacitor 7.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、ＡＭ放送、ＦＭ放
送、テレビ放送等の受信に適している車両用ガラスアン
テナ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass antenna device for a vehicle which is suitable for receiving AM broadcast, FM broadcast, television broadcast and the like.

【０００２】[0002]

【従来の技術】従来、ＡＭ放送帯及びＦＭ放送帯受信用
のガラスアンテナにおいては、窓ガラス板に設けられた
アンテナ導体の面積が狭いのでアンテナの受信感度が悪
く、受信感度の不足を補償するため、アンテナ導体の給
電点と受信機との間の給電線の好適な部位に前置増幅器
を挿入接続することが行われていた。しかし、前置増幅
器挿入の結果、強電界中において波形歪や混変調などが
発生し、ノイズがそのまま増幅されるという問題があっ
た。また、受信機とは別に前置増幅器を設ける必要があ
るため、生産性が悪いという問題があった。2. Description of the Related Art Conventionally, in a glass antenna for receiving an AM broadcasting band and an FM broadcasting band, the antenna conductor provided on a window glass plate has a small area, so that the receiving sensitivity of the antenna is poor and the shortage of the receiving sensitivity is compensated. For this reason, a preamplifier is inserted and connected to a suitable portion of a feed line between a feed point of an antenna conductor and a receiver. However, as a result of inserting the preamplifier, there is a problem that waveform distortion or cross modulation occurs in a strong electric field, and the noise is amplified as it is. In addition, since a preamplifier must be provided separately from the receiver, there is a problem that productivity is low.

【０００３】また、図５に示すように自動車の後部のサ
イド窓ガラス板１１にアンテナ導体９２と給電点９２ａ
とを設けた車両用ガラスアンテナ装置が知られている。
図５の従来例では受信感度が不充分であるため、前置増
幅器を必要とした。また、アンテナ導体９２の導体パタ
ーンが複雑なため、適正な受信特性を得るための導体パ
ターンの形状設計に長時間を要しており、生産性が悪か
った。As shown in FIG. 5, an antenna conductor 92 and a feed point 92a are provided on a side window glass plate 11 at the rear of the automobile.
There is known a glass antenna device for a vehicle provided with the following.
In the prior art shown in FIG. 5, a preamplifier was required because the receiving sensitivity was insufficient. In addition, since the conductor pattern of the antenna conductor 92 is complicated, it takes a long time to design the shape of the conductor pattern to obtain appropriate reception characteristics, and productivity is poor.

【０００４】[0004]

【発明が解決しようとする課題】本発明の目的は、簡単
な導体パターンにおいて前置増幅器を使用せずに従来技
術と同等以上の性能を確保し、かつ、アンテナ導体を設
けうるエリアが狭い窓ガラス板であっても高感度で受信
できる車両用ガラスアンテナ装置の提供にある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a window having a simple conductor pattern, which does not use a preamplifier, has a performance equal to or higher than that of the prior art, and has a small area where an antenna conductor can be provided. Another object of the present invention is to provide a glass antenna device for a vehicle that can receive a signal with high sensitivity even with a glass plate.

【０００５】[0005]

【課題を解決するための手段】本発明は、車両の窓ガラ
ス板に設けられたアンテナ導体、アース導体、アンテナ
導体に設けられた給電点及びアース導体に設けられたア
ース点とからなり、アンテナ導体とアース導体とは略平
行であり、アンテナ導体は低受信周波数帯と高受信周波
数帯の両受信周波数帯を受信できるようにし、アンテナ
導体と受信機との間に第１のコイルとコンデンサとが電
気的に並列接続されたものを電気的に接続し、第１のコ
イルのインダクタンス値は少なくとも低受信周波数帯に
おいて低インピーダンスとなるようにし、コンデンサは
高受信周波数帯において低インピーダンスとなり、低受
信周波数帯において高インピーダンスとなるような容量
値であり、第１のコイルのインダクタンスとケーブルの
浮遊容量を含む容量とで第１の共振を起こさせるように
し、第１の共振の共振周波数が高受信周波数帯より低い
周波数に存在するようにし、アンテナ導体側と反対側の
コンデンサの端部と、受信機側とをケーブルによって電
気的に接続することを特徴とする車両用ガラスアンテナ
装置を提供する。The present invention comprises an antenna conductor provided on a window glass plate of a vehicle, a ground conductor, a feed point provided on the antenna conductor, and a ground point provided on the ground conductor. The conductor and the ground conductor are substantially parallel, and the antenna conductor enables reception of both the low reception frequency band and the high reception frequency band, and a first coil, a capacitor, and a capacitor are provided between the antenna conductor and the receiver. Are electrically connected in parallel with each other, so that the inductance value of the first coil has a low impedance at least in a low reception frequency band, and the capacitor has a low impedance in a high reception frequency band. The capacitance value is such that the impedance becomes high in the frequency band, and the capacitance value includes the inductance of the first coil and the stray capacitance of the cable. And causes the first resonance to occur, so that the resonance frequency of the first resonance exists at a frequency lower than the high reception frequency band, and the end of the capacitor opposite to the antenna conductor side and the receiver side Are electrically connected by a cable to provide a glass antenna device for a vehicle.

【０００６】また、アース導体の幅が０．２〜１０ｍｍ
の範囲にある上記車両用ガラスアンテナ装置、及び、ア
ンテナ導体とアース導体との間隔が１〜１００ｍｍの範
囲にある上記車両用ガラスアンテナ装置を提供する。The width of the ground conductor is 0.2 to 10 mm.
And the glass antenna device for a vehicle in which the distance between the antenna conductor and the ground conductor is in the range of 1 to 100 mm.

【０００７】[0007]

【発明の実施の形態】図１は本発明の車両用ガラスアン
テナ装置の代表例の構成図であり、低受信周波数帯及び
高受信周波数帯の２つの受信周波数帯の受信を想定して
いる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a configuration diagram of a typical example of a glass antenna device for a vehicle according to the present invention, and assumes reception in two reception frequency bands, a low reception frequency band and a high reception frequency band.

【０００８】図１において、１１は自動車の後部サイド
の窓ガラス板、１はアンテナ導体、３は第１のコイル、
７は高受信周波数帯用のバイパスコンデンサ、８は必要
に応じて設けられる第２のコイル、１３はアース導体、
１ａはアンテナ導体１と同軸ケーブル（不図示）の内部
導体とを接続するための給電点、１３ａはアース導体３
のアース点、１８は必要に応じて設けられる第３のコイ
ルである。図１以外の図面で図１と同番号、同符号の部
分の名称は図１と同名称とする。In FIG. 1, reference numeral 11 denotes a window glass on the rear side of an automobile, 1 denotes an antenna conductor, 3 denotes a first coil,
7 is a bypass capacitor for a high reception frequency band, 8 is a second coil provided as needed, 13 is a ground conductor,
Reference numeral 1a denotes a feed point for connecting the antenna conductor 1 to an inner conductor of a coaxial cable (not shown), and 13a denotes a ground conductor 3.
Is a third coil 18 provided as needed. In the drawings other than FIG. 1, the names of the same numbers and the same reference numerals as those of FIG. 1 are the same as those of FIG. 1.

【０００９】図２に図１の等価回路図を示す。図２にお
いて、Ｅ_L はアンテナ導体１の電圧電源、Ｃ_L0はアンテ
ナ導体１の有効容量、Ｃ_L1はアンテナ導体１の浮遊容量
（無効容量）、Ｃ_H1はケーブル（不図示）の浮遊容量
（無効容量）である。FIG. 2 shows an equivalent circuit diagram of FIG. In FIG. 2, E _L is the voltage power supply of the antenna conductor 1, C _L0 is the effective capacitance of the antenna conductor 1, C _L1 is the stray capacitance (ineffective capacitance) of the antenna conductor 1, and C _H1 is the stray capacitance (not shown) of the cable (not shown). Invalid capacity).

【００１０】ここで、ケーブルとはバイパスコンデンサ
の受信機側の端部と受信機（不図示）とを接続するケー
ブルをいう。また、浮遊容量とは静電容量（electric c
apacity ）を意味する。図２以外の図面で図２と同番
号、同符号の部分の名称は図２と同名称とする。Here, the cable refers to a cable that connects an end of the bypass capacitor on the receiver side to a receiver (not shown). The stray capacitance is the capacitance (electric c
apacity). In the drawings other than FIG. 2, the names of the same numbers and the same reference numerals as those of FIG. 2 are the same as those of FIG. 2.

【００１１】アース点１３ａは、通常、車体アースに接
続される。ケーブルとして同軸ケーブルを使用する場合
には、通常、アース点１３ａには同軸ケーブルの外部導
体を接続する。The ground point 13a is normally connected to the vehicle body ground. When a coaxial cable is used as the cable, an outer conductor of the coaxial cable is usually connected to the ground point 13a.

【００１２】高受信周波数帯において第１のコイル３は
高インピーダンスとなることが高受信周波数帯受信にと
って好ましい。しかし、高受信周波数帯において第１の
コイル３は高インピーダンスとならなくとも、使用でき
る。In the high reception frequency band, it is preferable that the first coil 3 has a high impedance for high reception frequency band reception. However, in the high reception frequency band, the first coil 3 can be used even if it does not have high impedance.

【００１３】また、低インピーダンスとは、アンテナ導
体１の低受信周波数帯の受信信号が受信機側に流れやす
い範囲内のインピーダンスをいい、通常、受信機側の入
力インピーダンスの５倍以下となる。また、受信機側の
入力インピーダンスとは、通常、受信機の入力インピー
ダンスをいう。しかし、受信機の入力とアンテナとの間
にインピーダンス変換器が接続されている場合には、イ
ンピーダンス変換器の入力インピーダンスをいう。The low impedance refers to an impedance within a range in which a received signal of the antenna conductor 1 in a low reception frequency band easily flows to the receiver side, and is usually five times or less the input impedance of the receiver side. The input impedance on the receiver side usually means the input impedance of the receiver. However, when an impedance converter is connected between the input of the receiver and the antenna, it refers to the input impedance of the impedance converter.

【００１４】また、高インピーダンスとは、アンテナ導
体１の低受信周波数帯の受信信号が受信機側に流れにく
い範囲内のインピーダンスをいい、通常、受信機側の入
力インピーダンスの５倍超となる。The term "high impedance" refers to an impedance within a range in which a reception signal in a low reception frequency band of the antenna conductor 1 is difficult to flow to the receiver, and is generally more than five times the input impedance of the receiver.

【００１５】低受信周波数帯がＡＭ放送である場合、Ａ
Ｍ放送受信の際の受信機側の入力インピーダンスは、通
常、１〜１０ｋΩである。そのため、例えば、受信機側
の入力インピーダンスが５ｋΩである場合には、２５ｋ
Ω以下が低インピーダンスとなり、２５ｋΩ超が高イン
ピーダンスとなる。When the low reception frequency band is AM broadcasting, A
The input impedance of the receiver at the time of receiving the M broadcast is usually 1 to 10 kΩ. Therefore, for example, when the input impedance on the receiver side is 5 kΩ, 25 kΩ
Ω or less has low impedance, and more than 25 kΩ has high impedance.

【００１６】また、高受信周波数帯がＦＭ放送である場
合、ＦＭ放送受信の際の受信機側の入力インピーダンス
は、通常、５０又は７５Ωである。そのため、例えば、
受信機側の入力インピーダンスが５０Ωである場合に
は、２５０Ω以下が低インピーダンスとなり、２５０Ω
超が高インピーダンスとなる。When the high receiving frequency band is FM broadcasting, the input impedance of the receiver at the time of receiving FM broadcasting is usually 50 or 75Ω. So, for example,
If the input impedance on the receiver side is 50Ω, 250Ω or less becomes low impedance and 250Ω
Super becomes high impedance.

【００１７】低受信周波数帯受信の場合には、アンテナ
導体１の受信信号が第１のコイル３に伝えられ、さら
に、その受信信号が受信機に送られる。この場合、第１
のコイル３のインダクタンスと、主に浮遊容量Ｃ_H1とで
直列共振（第１の共振）を起こさせる。要するに第１の
コイル３と第１の他の要素とで第１の共振を起こさせ
る。ここで、第１の他の要素とは浮遊容量Ｃ_H1のみに限
定されず、第１の共振に影響する要素であって、図１の
回路に人為的又は非人為的に加えられるインダクタンス
成分、容量成分、抵抗成分等を含む。例えば、浮遊容量
Ｃ_H1と並列にコンデンサを接続する例が挙げられる。In the case of reception in a low reception frequency band, a reception signal of the antenna conductor 1 is transmitted to the first coil 3, and the reception signal is transmitted to a receiver. In this case, the first
A series resonance (first resonance) is caused by the inductance of the coil 3 and the stray capacitance C _H1 . In short, the first resonance is caused between the first coil 3 and the first other element. Here, the first other element is not limited to the stray capacitance C _H1, but is an element that affects the first resonance, and is an inductance component artificially or non-artificially added to the circuit of FIG. It includes a capacitance component, a resistance component, and the like. For example, there is an example in which a capacitor is connected in parallel with the stray capacitance C _H1 .

【００１８】この直列共振である第１の共振により、第
１のコイル３と浮遊容量Ｃ_H1との直列接続によるリアク
タンス（直列共振リアクタンス）と浮遊容量Ｃ_L1とによ
って、アンテナ導体１側から見た場合、並列共振が起き
る。Due to the first resonance which is the series resonance, the reactance (series resonance reactance) of the first coil 3 and the stray capacitance C _H1 connected in series and the stray capacitance C _L1 are viewed from the antenna conductor 1 side. In this case, parallel resonance occurs.

【００１９】この並列共振により、所望の受信周波数帯
の受信感度を向上できる。第１の共振については共振周
波数が高受信周波数帯より低い周波数に存在する必要が
ある。第１の共振を起こさせる場合には起こさせない場
合と比較して低受信周波数帯全域の受信感度が、通常、
５ｄＢ程度以上向上する。By this parallel resonance, the receiving sensitivity in a desired receiving frequency band can be improved. For the first resonance, it is necessary that the resonance frequency exists at a frequency lower than the high reception frequency band. In the case where the first resonance is caused, the reception sensitivity in the entire low reception frequency band is usually smaller than the case where the first resonance is not caused.
It is improved by about 5 dB or more.

【００２０】この並列共振の共振周波数は低受信周波数
帯に存在することが好ましい。存在する場合には存在し
ない場合と比較して低受信周波数帯全域の受信感度が、
通常、１０ｄＢ程度以上向上する。The resonance frequency of the parallel resonance preferably exists in a low reception frequency band. When it is present, the reception sensitivity in the entire low reception frequency band is lower than when it does not exist,
Usually, it is improved by about 10 dB or more.

【００２１】第１の共振には、アンテナ導体１の周辺の
配線の浮遊容量もわずかながら影響する。例えば、第１
のコイル３及び第２のコイル８等の配線の浮遊容量であ
る。The first resonance is slightly affected by the stray capacitance of the wiring around the antenna conductor 1. For example, the first
And the stray capacitance of wiring such as the second coil 8 and the second coil 8.

【００２２】本発明では、アンテナ導体１は浮遊容量Ｃ
_L1を有しており、第２のコイル８のインダクタンスと主
に浮遊容量Ｃ_L1とで見かけ上並列共振（第２の共振）さ
せることが好ましい。In the present invention, the antenna conductor 1 has a stray capacitance C
Has _L1, it is preferable to inductance and mainly apparently parallel resonance with the stray capacitance C _L1 of the second coil 8 (second resonance).

【００２３】要するに第２のコイル８と第２の他の要素
とで第２の共振を起こさせる。ここで、第２の他の要素
とは浮遊容量Ｃ_L1のみに限定されず、第２の共振に影響
する要素であって、図１の回路に人為的又は非人為的に
加えられるインダクタンス成分、容量成分、抵抗成分等
を含む。例えば、浮遊容量Ｃ_L1と並列にコンデンサを接
続する例が挙げられる。In short, the second resonance is caused by the second coil 8 and the second other element. Here, the second other element is not limited to the stray capacitance C _L1, but is an element affecting the second resonance, and an inductance component artificially or non-artificially added to the circuit of FIG. It includes a capacitance component, a resistance component, and the like. For example, there is an example in which a capacitor is connected in parallel with the stray capacitance C _L1 .

【００２４】この第２の共振を起こさせようとし、第２
のコイル８のインダクタンス値と第２の他の要素の値と
を設定しても、通常、実際には第２の共振（以下、見か
け第２の共振という）は起きずに、図２に示す回路全体
の系で、第２の共振とは別の２つの共振（第２の共振の
付随共振）が起きる。この付随共振は、アンテナ導体１
側から見た場合、並列共振的な性質が強い。In order to cause this second resonance, the second resonance
Even if the inductance value of the coil 8 and the value of the second other element are set, the second resonance (hereinafter, apparently the second resonance) does not actually occur, and is shown in FIG. In the system of the entire circuit, two resonances different from the second resonance (accompanying resonances of the second resonance) occur. This incident resonance causes the antenna conductor 1
When viewed from the side, it has a strong parallel resonance property.

【００２５】この２つの共振により、所望の受信周波数
帯の受信感度を向上でき、平坦化できる。第２の共振の
付随共振を起こさせようとする場合には起こさせようと
しない場合と比較して低受信周波数帯全域の受信感度
が、通常、５ｄＢ程度以上向上する。By these two resonances, the receiving sensitivity in a desired receiving frequency band can be improved and the receiving frequency can be flattened. When the incidental resonance of the second resonance is caused to occur, the receiving sensitivity in the entire low receiving frequency band is improved by about 5 dB or more as compared with the case where the incidental resonance is not caused.

【００２６】コンデンサ７は高受信周波数帯において低
インピーダンスとなり、低受信周波数帯において高イン
ピーダンスとなるような容量値とする。したがって、ア
ンテナ導体１に励起された高受信周波数帯の受信信号は
コンデンサ７を介して受信機に送られる。コンデンサ７
の容量値は、通常、１〜１０００ｐＦ程度が採用され
る。例えば、低受信周波数帯がＡＭ放送帯、高受信周波
数帯がＦＭ放送帯である場合、コンデンサ７の容量値は
５．０〜３３ｐＦの範囲が好ましい。The capacitor 7 has such a capacitance value that it has a low impedance in a high reception frequency band and a high impedance in a low reception frequency band. Therefore, the reception signal of the high reception frequency band excited by the antenna conductor 1 is sent to the receiver via the capacitor 7. Capacitor 7
The capacitance value is usually about 1 to 1000 pF. For example, when the low reception frequency band is the AM broadcast band and the high reception frequency band is the FM broadcast band, the capacitance value of the capacitor 7 is preferably in the range of 5.0 to 33 pF.

【００２７】図３は本発明におけるアンテナ導体１のパ
ターンの代表例の平面図である。図３において、４は車
体開口部、Ｌ₁ はアンテナ導体１の長さ、Ｌ₂ はアース
導体１３の略縦方向の長さ、ｄ₁ はアンテナ導体１とア
ース導体１３の間隔、ｄ₂ はアンテナ導体１と車体開口
部４との最短距離である。FIG. 3 is a plan view of a typical example of the pattern of the antenna conductor 1 according to the present invention. 3, 4 the vehicle body opening, L ₁ is the antenna conductor 1 length, L ₂ is substantially vertical length of the grounding conductor 13, the distance d ₁ is the antenna conductor 1 and ground conductor 13, d ₂ is The shortest distance between the antenna conductor 1 and the vehicle body opening 4.

【００２８】本発明では、アンテナ導体１、給電点１
ａ、アース導体１３及びアース点１３ａを窓ガラス板１
１に設ける。また、図３に示すようにアンテナ導体１と
アース導体１３とは、略平行に設けられており、簡単な
パターンを窓ガラス板に設けることで、電波信号を効率
よく受信できる。給電点１ａはアース点１３ａ近傍に設
けることが好ましく、両者の距離は５０ｍｍ以内が好ま
しく、３０ｍｍ以内がより好ましい。In the present invention, the antenna conductor 1, the feeding point 1
a, the ground conductor 13 and the ground point 13a
1 is provided. Further, as shown in FIG. 3, the antenna conductor 1 and the ground conductor 13 are provided substantially in parallel, and by providing a simple pattern on the window glass plate, a radio signal can be efficiently received. The power supply point 1a is preferably provided near the ground point 13a, and the distance between the two is preferably within 50 mm, more preferably within 30 mm.

【００２９】アース導体１３の形状は、アンテナ導体１
とアース導体１３の間隔ｄ₁ を一定にしやすくし、受信
特性向上のため又は受信特性の調整のためのアンテナ導
体１とアース導体１３のパターン決定を容易にするた
め、略帯状が好ましい。しかし、これに限られず、アー
ス導体１３の形状は、略楕円状、略円状、例えば直角三
角形等の略三角形状、略正四角形状、略多角形状又は、
略Ｖ字状であってもよい。窓ガラス板の角部にアンテナ
導体１とアース導体１３とを設ける場合、アース導体１
３の形状は、略楕円状、略円状、略直角三角形等が好ま
しい場合もある。なお、アース導体１３とアース点１３
ａとが一体となっていてもよい。The shape of the ground conductor 13 is as follows.
In order to make the distance d ₁ between the antenna conductor 1 and the ground conductor 13 constant and to easily determine the pattern of the antenna conductor 1 and the ground conductor 13 for improving the reception characteristics or adjusting the reception characteristics, a substantially band shape is preferable. However, the present invention is not limited to this, and the shape of the ground conductor 13 is substantially elliptical, substantially circular, for example, substantially triangular such as a right triangle, substantially square, substantially polygonal, or
It may be substantially V-shaped. When the antenna conductor 1 and the ground conductor 13 are provided at the corners of the window glass plate, the ground conductor 1
The shape of 3 may be preferably a substantially elliptical shape, a substantially circular shape, a substantially right triangle, or the like. The ground conductor 13 and the ground point 13
a may be integrated.

【００３０】また、アンテナ導体１の形状は、通常、略
直線状、略曲線状又は略Ｖ字状等であってもよく、アン
テナ導体１の線幅は、通常、０．２〜５ｍｍであること
が好ましい。The shape of the antenna conductor 1 may be generally a straight line, a substantially curved line, a substantially V shape, or the like, and the line width of the antenna conductor 1 is usually 0.2 to 5 mm. Is preferred.

【００３１】アンテナ導体１とアース導体１３とは、所
定の間隔を隔てて略平行であることを要する。ただし、
アンテナ導体１とアース導体１３の大部分が略平行であ
れば一部において略平行でない部分があっても使用でき
る。The antenna conductor 1 and the ground conductor 13 need to be substantially parallel to each other at a predetermined interval. However,
If most of the antenna conductor 1 and the ground conductor 13 are substantially parallel, even if some of them are not substantially parallel, they can be used.

【００３２】アンテナ導体１とアース導体１３の間隔ｄ
₁ は１〜１００ｍｍであることが好ましい。この範囲内
の場合には、この範囲外の場合と比較してＦＭ放送帯等
の高周波帯の受信感度が、通常、２ｄＢ程度以上向上す
る。The distance d between the antenna conductor 1 and the ground conductor 13
₁ is preferably ₁ to 100 mm. When it is within this range, the reception sensitivity in a high-frequency band such as an FM broadcast band is usually improved by about 2 dB or more as compared with the case outside this range.

【００３３】間隔ｄ₁ は３〜７０ｍｍであることが好ま
しく、この範囲内の場合には、この範囲外の場合と比較
してＦＭ放送帯等の１０ＭＨｚ以上の高周波帯の受信感
度が、通常、１．５ｄＢ程度以上向上する。The distance d ₁ is preferably 3 to 70 mm. When the distance d ₁ is within this range, the reception sensitivity in a high frequency band of 10 MHz or more, such as the FM broadcast band, is usually smaller than that outside this range. It is improved by about 1.5 dB or more.

【００３４】アンテナ導体１と車体開口部４との最短距
離ｄ₂ は５〜３００ｍｍであることが好ましい。この範
囲内の場合には、この範囲外の場合と比較してＦＭ放送
帯等の１０ＭＨｚ以上の高周波帯の受信感度が通常０．
５ｄＢ程度以上向上する。また、最短距離ｄ₂ は１０〜
２００ｍｍであることがより好ましく、この範囲内の場
合には、この範囲外の場合と比較してＦＭ放送帯等の１
０ＭＨｚ以上の高周波帯の受信感度が通常１．０ｄＢ程
度以上向上する。The shortest distance d ₂ between the antenna conductor 1 and the vehicle body opening 4 is preferably 5 to 300 mm. In the case of being within this range, the reception sensitivity in a high frequency band of 10 MHz or more, such as the FM broadcasting band, is usually 0.1 in comparison with the case of being out of this range.
It is improved by about 5 dB or more. The shortest distance d ₂ is 10
It is more preferable that the distance be within 200 mm.
The reception sensitivity in a high frequency band of 0 MHz or more is usually improved by about 1.0 dB or more.

【００３５】アンテナ導体１とアース導体１３の位置に
ついては、車体開口部４とアンテナ導体１との間にアー
ス導体１３が配設されていることが好ましい。その場合
には、車体開口部４とアース導体１３との間にアンテナ
導体１が配設されている場合と比較して、ＦＭ放送帯等
の１０ＭＨｚ以上の高周波帯の受信感度が通常１．０ｄ
Ｂ程度以上向上する。ここで、車体開口部４とは窓ガラ
ス板がはめ込まれる車体の開口部であって車体アースと
なるべきものをいい、金属等の導電性材料で構成されて
いるものをいう。Regarding the positions of the antenna conductor 1 and the ground conductor 13, it is preferable that the ground conductor 13 is disposed between the vehicle body opening 4 and the antenna conductor 1. In this case, the reception sensitivity in a high frequency band of 10 MHz or more such as an FM broadcasting band is usually 1.0 d compared to the case where the antenna conductor 1 is provided between the vehicle body opening 4 and the ground conductor 13.
B or more is improved. Here, the vehicle body opening 4 is an opening of the vehicle body into which the window glass plate is to be fitted and which should serve as a vehicle body ground, and is made of a conductive material such as metal.

【００３６】アンテナ導体１の長さＬ₁ は、所望の受信
中心周波数の波長をλ、ガラス短縮率をＫ、受信最高周
波数波長をλ_H 、受信最低周波数波長をλ_L とすると
き、車両車体の影響、ガラス形状の影響を加味して実験
的に求めると、（λ_H ・Ｋ／８）〜λ_L ・Ｋであること
が好ましい。この範囲内の場合には、この範囲外の場合
と比較してＦＭ放送帯等の１０ＭＨｚ以上の高周波帯の
受信感度が、通常、２ｄＢ程度以上向上する。なお、ガ
ラス短縮率Ｋは通常０．６４である。アンテナ導体１の
長さＬ₁ のより好ましい範囲は（λ_H ・Ｋ／４）〜（λ
_L ・Ｋ／２）である。When the length L ₁ of the antenna conductor 1 is λ, the wavelength of the desired reception center frequency is λ, the glass shortening rate is K, the maximum reception frequency wavelength is λ _H , and the minimum reception frequency wavelength is λ _L , effect, when taking into account the influence of the glass shape determined experimentally, it is preferable that _{(λ H · K / 8)} ~λ L · K. When it is within this range, the reception sensitivity in a high-frequency band of 10 MHz or more, such as the FM broadcast band, is usually improved by about 2 dB or more as compared with the case outside this range. The glass shortening rate K is usually 0.64. A more preferable range of the length L ₁ of the antenna conductor 1 is (λ _H · K / 4) to (λ
_L · K / 2).

【００３７】また、同様にアース導体１３の長さＬ₂ は
（λ_H ・Ｋ／２０）〜（λ_L ・Ｋ／２）であることが好
ましい。この範囲内の場合には、この範囲外の場合と比
較してＦＭ放送帯等の１０ＭＨｚ以上の高周波帯の受信
感度が、通常、１．０ｄＢ程度以上向上する。[0037] Similarly, the length L ₂ of the grounding conductor 13 is preferably _{(λ H · K / 20)} ~ (λ L · K / 2). When it is within this range, the reception sensitivity in a high frequency band of 10 MHz or more, such as the FM broadcast band, is usually improved by about 1.0 dB or more as compared with the case outside this range.

【００３８】また、アース導体１３の幅は０．２〜１０
ｍｍであることが好ましい。この範囲内の場合には、こ
の範囲外の場合と比較してＦＭ放送帯等の１０ＭＨｚ以
上の高周波帯の受信感度が、通常、１．０ｄＢ程度以上
向上する。The width of the ground conductor 13 is 0.2 to 10
mm. When it is within this range, the reception sensitivity in a high frequency band of 10 MHz or more, such as the FM broadcast band, is usually improved by about 1.0 dB or more as compared with the case outside this range.

【００３９】また、アース導体１３の幅は０．２〜３ｍ
ｍであることがより好ましく、この範囲内の場合には、
この範囲外の場合と比較してＦＭ放送帯等の１０ＭＨｚ
以上の高周波帯の受信感度が、通常、０．５ｄＢ程度以
上向上する。The width of the ground conductor 13 is 0.2 to 3 m.
m is more preferable, and within this range,
10MHz of FM broadcast band etc.
The reception sensitivity in the high frequency band described above is usually improved by about 0.5 dB or more.

【００４０】図１では給電点１ａとアース点１３ａは、
サイド窓ガラス板１１の右上に設けられているが、この
場所に限られず、窓ガラス板のどの位置に配設されてい
てもよく、例えば、窓ガラス板の左右中央の上下周縁部
に配設されていてもよい。In FIG. 1, the feed point 1a and the ground point 13a are
Although provided at the upper right of the side window glass plate 11, it is not limited to this location, and may be provided at any position of the window glass plate. It may be.

【００４１】本発明のガラスアンテナは、ＡＭ、ＦＭラ
ジオ放送帯用に限定されず、テレビＶＨＦ帯用、テレビ
ＵＨＦ帯用及び電話用等に応用でき、窓ガラス板に設け
られるアンテナ導体及びアース導体の数は限定されな
い。The glass antenna of the present invention is not limited to AM and FM radio broadcasting bands, but can be applied to television VHF bands, television UHF bands, telephones, etc., and has an antenna conductor and a ground conductor provided on a window glass plate. Is not limited.

【００４２】また、本発明において、アンテナ導体が設
けられる窓ガラス板はサイド窓ガラス板に限定されず、
後部窓ガラス板、前部窓ガラス板、ルーフ窓ガラス板等
であってもよい。In the present invention, the window glass plate provided with the antenna conductor is not limited to the side window glass plate.
It may be a rear window glass plate, a front window glass plate, a roof window glass plate, or the like.

【００４３】また、アンテナ導体、アース導体とは、通
常、導電性銀ペースト等の導電性金属含有ペーストを窓
ガラス板の車内側表面にプリントし、焼付けて形成する
等により製造するが、この形成方法に限定されず、銅線
等の導電性の線状体又は箔状体を窓ガラス板の車内側又
は車外側表面に形成してもよく、窓ガラス板の内部に設
けてもよい。また、アンテナ導体、アース導体の少なく
とも１つを透明導電物質としてもよい。The antenna conductor and the ground conductor are usually manufactured by printing and baking a conductive metal-containing paste such as a conductive silver paste on the inner surface of the window glass plate. The method is not limited, and a conductive linear body or foil-like body such as a copper wire may be formed on the inside or outside surface of the window glass plate, or may be provided inside the window glass plate. Further, at least one of the antenna conductor and the ground conductor may be made of a transparent conductive material.

【００４４】また、本発明においては、車両に設けられ
るアンテナ導体及びアース導体の数は限定されず、ま
た、本発明のガラスアンテナ同志、また、本発明のガラ
スアンテナと、ポールアンテナ等の他のアンテナ及び／
又は他のガラスアンテナとの間でダイバーシティ受信を
行ってもよい。Further, in the present invention, the numbers of antenna conductors and ground conductors provided on the vehicle are not limited, and the glass antennas of the present invention, the glass antenna of the present invention, and other antennas such as a pole antenna may be used. Antenna and / or
Alternatively, diversity reception may be performed with another glass antenna.

【００４５】図４に本発明における共振回路の応用例の
回路図を示す。図４において、２１、２２はダンピング
用の抵抗、６１は第１の高周波コイル、６２は第２の高
周波コイル、６３は第３の高周波コイル、７１はコンデ
ンサである。第１の高周波コイル６１、第２の高周波コ
イル６２及び第３の高周波コイル６３は、必要に応じて
設けられるものであり、受信信号が車体アースに漏れる
のを防止する機能を有する。FIG. 4 is a circuit diagram showing an application example of the resonance circuit according to the present invention. 4, reference numerals 21 and 22 denote damping resistors, 61 denotes a first high-frequency coil, 62 denotes a second high-frequency coil, 63 denotes a third high-frequency coil, and 71 denotes a capacitor. The first high-frequency coil 61, the second high-frequency coil 62, and the third high-frequency coil 63 are provided as necessary, and have a function of preventing a reception signal from leaking to the vehicle body ground.

【００４６】第１の高周波コイル６１、第２の高周波コ
イル６２及び第３の高周波コイル６３の組合せとして
は、第３の高周波コイル６３のみを設けることが好まし
く、第１の高周波コイル６１及び第２の高周波コイル６
２を設けることがより好ましい。第１の高周波コイル６
１及び第２の高周波コイル６２を設ける場合には第３の
高周波コイル６３を設けても設けなくても受信特性に影
響はほとんどない。しかし、第３の高周波コイル６３を
設けない場合の方が設ける場合と比較して生産性がよ
い。As a combination of the first high-frequency coil 61, the second high-frequency coil 62, and the third high-frequency coil 63, it is preferable that only the third high-frequency coil 63 is provided. High frequency coil 6
More preferably, 2 is provided. First high frequency coil 6
When the first and second high-frequency coils 62 are provided, the reception characteristics are hardly affected whether or not the third high-frequency coil 63 is provided. However, productivity is better when the third high frequency coil 63 is not provided than when it is provided.

【００４７】第３の高周波コイル６３のみを設ける場合
は、高周波コイル６１、６２、６３を全く設けない場合
と比較して、高受信周波数帯の受信感度が、通常、２ｄ
Ｂ以上向上する。また、第１の高周波コイル６１と第２
の高周波コイル６２を設ける場合には、高周波コイル６
１、６２、６３を全く設けない場合と比較して、高受信
周波数帯の受信感度が、通常、３ｄＢ以上向上する。When only the third high-frequency coil 63 is provided, the reception sensitivity in the high reception frequency band is usually 2d compared to the case where no high-frequency coils 61, 62, 63 are provided.
B or more. Also, the first high-frequency coil 61 and the second
When the high frequency coil 62 is provided, the high frequency coil 6
Compared with the case where 1, 62 and 63 are not provided at all, the reception sensitivity in the high reception frequency band is usually improved by 3 dB or more.

【００４８】図４において、第１の高周波コイル６１と
第２の高周波コイル６２とが設けられる場合であって、
低受信周波数帯受信の場合には、第１のコイル３ととも
に第１の高周波コイル６１と第２の高周波コイル６２が
低インピーダンスとなるため、アンテナ導体１と受信機
側とが接続される。第３の高周波コイル６３を設ける場
合であって、低受信周波数帯受信の場合には、第３の高
周波コイル６３が低インピーダンスとなり、第２の共振
が起きる。高周波コイル６１、６２、６３は、通常、
０．１〜１００μＨ程度が使用される。FIG. 4 shows a case where a first high-frequency coil 61 and a second high-frequency coil 62 are provided,
In the case of reception in the low reception frequency band, since the first high-frequency coil 61 and the second high-frequency coil 62 have low impedance together with the first coil 3, the antenna conductor 1 and the receiver side are connected. In the case where the third high-frequency coil 63 is provided, and in the case of reception in a low reception frequency band, the third high-frequency coil 63 has a low impedance, and the second resonance occurs. The high frequency coils 61, 62, 63 are usually
About 0.1 to 100 μH is used.

【００４９】高受信周波数帯が１０ＭＨｚ以上である場
合、高周波コイル６１、６２、６３は、少なくとも高受
信周波数帯では誘導性のインピーダンスを有し、高イン
ピーダンスとなるものであり、第１のコイル３又は第２
のコイル８が高受信周波数帯では、通常、自己共振周波
数が低く、インダクタンスを失うので高周波コイル６
１、６２、６３がこれを代行する。When the high receiving frequency band is 10 MHz or higher, the high frequency coils 61, 62, 63 have inductive impedance and high impedance at least in the high receiving frequency band. Or the second
When the coil 8 of the high frequency coil 6 has a high reception frequency band, the self-resonant frequency is usually low and the inductance is lost.
1, 62 and 63 act on behalf of this.

【００５０】第１のコイル３又は第２のコイル８が低受
信周波数帯から高受信周波数帯までの広い周波数帯域を
高インピーダンスとできれば高周波コイル６１、６２、
６３は不要であり、省略できる。If the first coil 3 or the second coil 8 can make a wide frequency band from a low reception frequency band to a high reception frequency band a high impedance, the high frequency coils 61, 62,
63 is unnecessary and can be omitted.

【００５１】高周波コイル６１、６２、６３として、適
当な長さのリード線を使用できる場合もある。しかし、
通常、磁気コアを使用しないソレノイド又は磁気コアを
使用したコイルを用いる。In some cases, lead wires of an appropriate length can be used as the high-frequency coils 61, 62, 63. But,
Usually, a solenoid using no magnetic core or a coil using a magnetic core is used.

【００５２】アンテナ導体１は低受信周波数帯用と高受
信周波数帯用のアンテナ導体として機能している。The antenna conductor 1 functions as an antenna conductor for a low reception frequency band and a high reception frequency band.

【００５３】コンデンサ７は高受信周波数帯において低
インピーダンスとなり、低受信周波数帯において高イン
ピーダンスとなるような容量値とする。したがって、ア
ンテナ導体１に励起された高受信周波数帯の受信信号は
コンデンサ７を介して受信機に送られる。コンデンサ７
の容量値は、通常、１〜１０００ｐＦ程度が採用され
る。例えば、低受信周波数帯がＡＭ放送帯、高受信周波
数帯がＦＭ放送帯である場合、コンデンサ７の容量値
は、５．０〜３３ｐＦの範囲が好ましい。The capacitor 7 has a capacitance value such that it has a low impedance in a high reception frequency band and has a high impedance in a low reception frequency band. Therefore, the reception signal of the high reception frequency band excited by the antenna conductor 1 is sent to the receiver via the capacitor 7. Capacitor 7
The capacitance value is usually about 1 to 1000 pF. For example, when the low reception frequency band is the AM broadcast band and the high reception frequency band is the FM broadcast band, the capacitance value of the capacitor 7 is preferably in the range of 5.0 to 33 pF.

【００５４】ダンピング用の抵抗２１、２２は、必要に
応じて設けられるものであり、第１の共振又は第２の共
振のクオリティファクタ（Ｑ）が適正であり、抵抗２
１、２２を設けなくても受信感度の平坦性が確保できれ
ば不要である。抵抗２１、２２以外にダンピング用の抵
抗を設けてもよい。The damping resistors 21 and 22 are provided as necessary. The quality factor (Q) of the first resonance or the second resonance is appropriate, and the resistance 2
It is unnecessary if the flatness of the receiving sensitivity can be ensured without providing the first and second elements. A damping resistor may be provided in addition to the resistors 21 and 22.

【００５５】コンデンサ７１は直流電圧阻止用であり、
必要に応じて設けられる。The capacitor 71 is for blocking a DC voltage.
Provided as needed.

【００５６】[0056]

【実施例】【Example】

「例１（実施例）、例２（比較例）及び例３（比較
例）」例１として、ＡＭ放送とＦＭ放送との受信を前提
として図１のようなガラスアンテナ装置を製作した。低
受信周波数帯がＡＭ放送周波数帯であり、高受信周波数
帯がＦＭ放送周波数帯である。"Example 1 (Example), Example 2 (Comparative Example), and Example 3 (Comparative Example)" As Example 1, a glass antenna device as shown in FIG. 1 was manufactured on the assumption that AM broadcast and FM broadcast were received. The low reception frequency band is the AM broadcast frequency band, and the high reception frequency band is the FM broadcast frequency band.

【００５７】サイド窓ガラス板１１の寸法は、上部横方
向が４００ｍｍ、下部横方向が５００ｍｍ、縦方向が３
５０ｍｍとした。アンテナ導体１の長さＬ₁ は６３０ｍ
ｍ、アース導体１３の略横方向の長さＬ₂ は５６０ｍ
ｍ、アンテナ導体１の線幅は、０．７ｍｍ、アース導体
１３の略縦方向の長さ（幅）は０．７ｍｍ、アンテナ導
体１とアース導体１３の間隔ｄ₁ は１０ｍｍ、アンテナ
導体１と車体開口部４との最短距離ｄ₂ は３５ｍｍ、給
電点１ａの寸法は１８ｍｍ×１８ｍｍ、アース点１３ａ
の寸法は１８ｍｍ×１８ｍｍ、給電点１ａとアース点１
３ａとの最短距離は５ｍｍとした。The size of the side window glass plate 11 is 400 mm in the upper horizontal direction, 500 mm in the lower horizontal direction, and 3 mm in the vertical direction.
It was 50 mm. The length L ₁ of the antenna conductor 1 is 630 m
m, the substantially horizontal length L ₂ of the ground conductor 13 is 560 m
m, the line width of the antenna conductor 1 is 0.7 mm, the length (width) of the ground conductor 13 in the substantially vertical direction is 0.7 mm, the distance d ₁ between the antenna conductor 1 and the ground conductor 13 is 10 mm, The shortest distance d ₂ from the vehicle body opening 4 is 35 mm, the size of the feeding point 1a is 18 mm × 18 mm, and the ground point 13a
Is 18mm × 18mm, feed point 1a and ground point 1
The shortest distance from 3a was 5 mm.

【００５８】共振回路は図４に示すものを採用した。図
４の共振回路において、第１の高周波コイル６１、第２
の高周波コイル６２、抵抗２１、２２、コンデンサ７１
は設け、第３の高周波コイル６３は設けなかった。第１
のコイル３はチップ型のものであって比較的広帯域のも
のを使用した。The resonance circuit shown in FIG. 4 was employed. In the resonance circuit of FIG.
High frequency coil 62, resistors 21, 22 and capacitor 71
Was provided, and the third high-frequency coil 63 was not provided. First
The coil 3 is of a chip type and has a relatively wide band.

【００５９】各回路素子の値には、ＡＭ放送周波数帯
（５００〜１５００ｋＨｚ）で第１のコイル３は３３０
μＨ、第２のコイル８は４７０μＨとした。また、ＦＭ
放送周波数帯（８８〜１０８ＭＨｚ）で高周波コイル６
１、６２は１．０μＨ、ＡＭ放送周波数帯及びＦＭ放送
周波数帯で抵抗２１は２７０Ω、抵抗２２は１２ｋΩ、
コンデンサ７は１８ｐＦ及びコンデンサ７１は２７００
ｐＦとした。The value of each circuit element includes the first coil 3 in the AM broadcast frequency band (500-1500 kHz).
μH and the second coil 8 was 470 μH. Also, FM
High frequency coil 6 in broadcast frequency band (88-108 MHz)
Reference numerals 1 and 62 denote 1.0 μH, AM broadcast frequency band and FM broadcast frequency band, the resistance 21 is 270Ω, the resistance 22 is 12 kΩ,
The capacitor 7 is 18 pF and the capacitor 71 is 2700
It was set to pF.

【００６０】また、アンテナ導体１の有効容量Ｃ_L0はほ
ぼ１０ｐＦ、アンテナ導体１の浮遊容量Ｃ_L1はほぼ４０
ｐＦ、ケーブル（不図示）の浮遊容量Ｃ_H1はほぼ１２０
ｐＦであった。The effective capacitance C _L0 of the antenna conductor 1 is approximately 10 pF, and the stray capacitance C _L1 of the antenna conductor 1 is approximately 40 pF.
pF, stray capacitance C _H1 of cable (not shown) is approximately 120
pF.

【００６１】例２として、従来使用されていた図５のよ
うな形状のガラスアンテナを製作した。例２では、サイ
ド窓ガラス板１の寸法は例１と同様で、給電点９２ａを
除くアンテナ導体９２全体の長さ（導体長の総計）は１
０００ｍｍとした。As Example 2, a conventionally used glass antenna having a shape as shown in FIG. 5 was manufactured. In Example 2, the dimensions of the side window glass plate 1 were the same as those in Example 1, and the total length (total conductor length) of the antenna conductor 92 excluding the feeding point 92a was 1
000 mm.

【００６２】例３は、例１において図４の共振回路を設
けないでアンテナ導体１の受信信号をそのまま受信機側
に送る場合とした。Example 3 is a case where the reception signal of the antenna conductor 1 is directly sent to the receiver side without providing the resonance circuit of FIG. 4 in Example 1.

【００６３】図６はＦＭ放送周波数帯域における例１と
例２との受信感度の周波数特性図である。例１は例２に
対してＦＭ放送周波数帯全域で受信感度が向上してい
た。例３ではＦＭ放送周波数帯域における受信感度は例
１と同様であった。FIG. 6 is a frequency characteristic diagram of the receiving sensitivity of Example 1 and Example 2 in the FM broadcast frequency band. In Example 1, the reception sensitivity was improved over the entire FM broadcast frequency band as compared with Example 2. In Example 3, the reception sensitivity in the FM broadcast frequency band was the same as in Example 1.

【００６４】図８はＡＭ放送周波数帯域における例１、
例２、例３の受信感度の周波数特性図である。例１は例
２に対してＡＭ放送周波数帯全域で受信感度が向上して
いた。例１では、第１の共振の共振周波数はほぼ７００
ｋＨｚ、第２の共振の共振周波数はほぼ１２００ｋＨ
ｚ、第２の共振の第１の付随共振周波数はほぼ５５０ｋ
Ｈｚ、第２の共振の第２の付随共振周波数はほぼ１３５
０ｋＨｚであった。FIG. 8 shows an example 1 in the AM broadcast frequency band.
FIG. 9 is a frequency characteristic diagram of the receiving sensitivity in Examples 2 and 3. In Example 1, the receiving sensitivity was improved over the entire AM broadcast frequency band as compared with Example 2. In Example 1, the resonance frequency of the first resonance is approximately 700
kHz, the resonance frequency of the second resonance is approximately 1200 kHz.
z, the first incident resonance frequency of the second resonance is approximately 550 k
Hz, the second incident resonance frequency of the second resonance is approximately 135
It was 0 kHz.

【００６５】「例４（実施例）」サイド窓ガラス板１１
の寸法及び共振回路は例１のものと同様とした。また、
アンテナ導体１の長さＬ₁ は６５０ｍｍ、アース導体１
３の略横方向の長さＬ₂は５４０ｍｍとし、それ以外の
導体パターンの仕様については、例１のものと同様とし
た。Example 4 (Example) Side window glass plate 11
The dimensions and the resonance circuit were the same as those in Example 1. Also,
The length L ₁ of the antenna conductor 1 is 650 mm, the ground conductor 1
Substantially horizontal length L ₂ of the 3 and 540 mm, for the specifications of the other conductor patterns were similar to those of Example 1.

【００６６】図７はＦＭ放送周波数帯域における例２と
例４との受信感度の周波数特性図である。例４は例２に
対してＦＭ放送周波数帯全域で受信感度が向上してい
た。FIG. 7 is a frequency characteristic diagram of the receiving sensitivity of Example 2 and Example 4 in the FM broadcast frequency band. In Example 4, the reception sensitivity was improved over the entire FM broadcast frequency band as compared with Example 2.

【００６７】[0067]

【発明の効果】本発明では、アンテナ導体とアース導体
とが所定の条件下にあるために、ＦＭ放送帯等の１０Ｍ
Ｈｚ以上の高周波帯の受信感度が高く、給電点と受信機
との間に受信信号を増幅するための前置増幅器を設ける
必要がなく、生産性がよい。According to the present invention, since the antenna conductor and the ground conductor are under a predetermined condition, the antenna conductor and the ground conductor are required to have a 10M band such as an FM broadcast band.
The reception sensitivity in the high frequency band of Hz or higher is high, and it is not necessary to provide a preamplifier for amplifying the reception signal between the feeding point and the receiver, and the productivity is high.

【００６８】また、本発明の車両用ガラスアンテナ装置
は、簡単な導体パターンから構成されているため、必要
な受信感度を得るために導体パターンを調整するのに長
時間を要せず、生産性がよく、アンテナ導体を設けうる
エリアが狭い窓ガラス板であってもアンテナ導体の占め
るスペースが小さくてすみ視野をさえぎることが少な
い。Further, since the glass antenna device for a vehicle according to the present invention is composed of a simple conductor pattern, it does not take a long time to adjust the conductor pattern to obtain the required receiving sensitivity, and the productivity is improved. The space occupied by the antenna conductor is small even if the area where the antenna conductor can be provided is narrow.

【００６９】また、第１のコイルのインダクタンスと、
主に低帯用アンテナ導体の浮遊容量等とで第１の共振を
起させ、かつ、共振周波数が高受信周波数帯より低い周
波数に存在させることにより、所望の低受信周波数帯の
受信感度を向上できる。Also, the inductance of the first coil,
The first resonance is caused mainly by the stray capacitance of the antenna conductor for the low band, and the resonance frequency is lower than the high reception frequency band, thereby improving the reception sensitivity in the desired low reception frequency band. it can.

【００７０】また、本発明にて、第２のコイル８を利用
して第２の共振を起こさせることにより、所望の低受信
周波数帯の受信感度を向上でき、かつ、優れた平坦性で
受信できる。Further, according to the present invention, by causing the second resonance using the second coil 8, the reception sensitivity in a desired low reception frequency band can be improved, and the reception can be performed with excellent flatness. it can.

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

【図１】本発明にかかる車両用ガラスアンテナ装置の代
表例の構成図FIG. 1 is a configuration diagram of a typical example of a glass antenna device for a vehicle according to the present invention.

【図２】図１の等価回路図FIG. 2 is an equivalent circuit diagram of FIG.

【図３】本発明におけるアンテナ導体１のパターンの代
表例の平面図FIG. 3 is a plan view of a typical example of a pattern of an antenna conductor 1 according to the present invention.

【図４】本発明における共振回路の応用例の回路図FIG. 4 is a circuit diagram of an application example of a resonance circuit according to the present invention.

【図５】車両用ガラスアンテナ装置の従来例の構成図FIG. 5 is a configuration diagram of a conventional example of a glass antenna device for a vehicle.

【図６】ＦＭ放送周波数帯域における例１と例２の受信
感度の周波数特性図FIG. 6 is a diagram showing frequency characteristics of reception sensitivity in Examples 1 and 2 in an FM broadcast frequency band.

【図７】ＦＭ放送周波数帯域における例４と例２の受信
感度の周波数特性図FIG. 7 is a frequency characteristic diagram of reception sensitivity in Example 4 and Example 2 in an FM broadcast frequency band.

【図８】ＡＭ放送周波数帯域における例１〜３の受信感
度の周波数特性図FIG. 8 is a frequency characteristic diagram of reception sensitivity in Examples 1 to 3 in an AM broadcast frequency band.

【符号の説明】[Explanation of symbols]

１１：後部のサイド窓ガラス板 １：アンテナ導体 ３：第１のコイル ７：バイパスコンデンサ ８：第２のコイル １３：アース導体 １ａ：給電点 １３ａ：アース点 １８：第３のコイル ２１、２２：ダンピング用の抵抗 ６１：第１の高周波コイル ６２：第２の高周波コイル ６３：第３の高周波コイル ７１：コンデンサ Ｅ_L ：アンテナ導体１の電圧電源 Ｃ_L0：アンテナ導体１の有効容量 Ｃ_L1：アンテナ導体１の浮遊容量 Ｃ_H1：ケーブルの浮遊容量11: Rear side window glass plate 1: Antenna conductor 3: First coil 7: Bypass capacitor 8: Second coil 13: Ground conductor 1a: Feeding point 13a: Ground point 18: Third coil 21, 22: Damping resistor 61: first high-frequency coil 62: second high-frequency coil 63: third high-frequency coil 71: capacitor E _L : voltage power supply of antenna conductor 1 C _L0 : effective capacity of antenna conductor 1 C _L1 : antenna Stray capacitance of conductor 1 C _H1 : Stray capacitance of cable

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】車両の窓ガラス板に設けられたアンテナ導
体、アース導体、アンテナ導体に設けられた給電点及び
アース導体に設けられたアース点とからなり、アンテナ
導体とアース導体とは略平行であり、 アンテナ導体は低受信周波数帯と高受信周波数帯の両受
信周波数帯を受信できるようにし、 アンテナ導体と受信機との間に第１のコイルとコンデン
サとが電気的に並列接続されたものを電気的に接続し、
第１のコイルのインダクタンス値は少なくとも低受信周
波数帯において低インピーダンスとなるようにし、 コンデンサは高受信周波数帯において低インピーダンス
となり、低受信周波数帯において高インピーダンスとな
るような容量値であり、 第１のコイルのインダクタンスとケーブルの浮遊容量を
含む容量とで第１の共振を起こさせるようにし、第１の
共振の共振周波数が高受信周波数帯より低い周波数に存
在するようにし、 アンテナ導体側と反対側のコンデンサの端部と、受信機
側とをケーブルによって電気的に接続することを特徴と
する車両用ガラスアンテナ装置。1. An antenna conductor provided on a window glass plate of a vehicle, a ground conductor, a feeding point provided on the antenna conductor, and a ground point provided on a ground conductor, and the antenna conductor and the ground conductor are substantially parallel to each other. The antenna conductor enables reception in both the low reception frequency band and the high reception frequency band, and a first coil and a capacitor are electrically connected in parallel between the antenna conductor and the receiver. Connect things electrically,
The inductance value of the first coil is set to have a low impedance at least in a low reception frequency band, and the capacitor has a capacitance value having a low impedance in a high reception frequency band and a high impedance in a low reception frequency band. The first resonance is caused by the inductance of the coil and the capacitance including the stray capacitance of the cable, so that the resonance frequency of the first resonance exists at a frequency lower than the high reception frequency band, and is opposite to the antenna conductor side. A glass antenna device for a vehicle, wherein an end of a condenser on the side and a receiver side are electrically connected by a cable. 【請求項２】アース導体の幅が０．２〜１０ｍｍの範囲
にある請求項１の車両用ガラスアンテナ装置。2. The glass antenna device for a vehicle according to claim 1, wherein the width of the ground conductor is in the range of 0.2 to 10 mm. 【請求項３】アンテナ導体とアース導体との間隔が１〜
１００ｍｍの範囲にある請求項１又は２の車両用ガラス
アンテナ装置。3. The distance between the antenna conductor and the ground conductor is 1 to 3.
The glass antenna device for a vehicle according to claim 1 or 2, which is in a range of 100 mm.