JPH10163727A - Glass antenna for vehicle - Google Patents
Glass antenna for vehicleInfo
- Publication number
- JPH10163727A JPH10163727A JP31819496A JP31819496A JPH10163727A JP H10163727 A JPH10163727 A JP H10163727A JP 31819496 A JP31819496 A JP 31819496A JP 31819496 A JP31819496 A JP 31819496A JP H10163727 A JPH10163727 A JP H10163727A
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- antenna
- parasitic
- antenna conductor
- vehicle body
- 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.)
- Withdrawn
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はＦＭ放送、テレビＶ
ＨＦ帯等の高周波帯受信用に適し、特に自動車のサイド
窓ガラス板に適した車両用ガラスアンテナに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to FM broadcasting, television V
The present invention relates to a glass antenna for a vehicle which is suitable for receiving a high frequency band such as an HF band, and particularly suitable for a side window glass plate of an automobile.
【０００２】[0002]
【従来の技術】従来、図３に示すように自動車の後部の
サイド窓ガラス板１にアンテナ導体３２、補助アンテナ
導体３３及び給電点３６を設け、これをアンテナとして
利用することによりＦＭ放送、テレビ放送等を受信して
いた。2. Description of the Related Art Conventionally, as shown in FIG. 3, an antenna conductor 32, an auxiliary antenna conductor 33 and a feed point 36 are provided on a side window glass plate 1 at the rear of an automobile, and these are used as antennas to provide FM broadcasting and television. We were receiving broadcasts.
【０００３】図３において、８はリード線、９は前置増
幅器、１０は同軸ケーブルである。車体開口部の周囲の
長さ（車体開口部にはめ込まれる窓ガラス板の外周とほ
ぼ同じ長さ）は２５００ｍｍ、アンテナ導体３２の導体
長は１０００ｍｍ、補助アンテナ導体３３の導体長は１
５００ｍｍ、アンテナ導体３２と補助アンテナ導体３３
との間隔は２０ｍｍ、アンテナ導体３２と車体開口部と
の最短距離は７０ｍｍである。In FIG. 3, reference numeral 8 denotes a lead wire, 9 denotes a preamplifier, and 10 denotes a coaxial cable. The length of the periphery of the vehicle body opening (almost the same as the outer circumference of the window glass plate fitted into the vehicle body opening) is 2500 mm, the conductor length of the antenna conductor 32 is 1000 mm, and the conductor length of the auxiliary antenna conductor 33 is 1
500 mm, antenna conductor 32 and auxiliary antenna conductor 33
Is 20 mm, and the shortest distance between the antenna conductor 32 and the vehicle body opening is 70 mm.
【０００４】[0004]
【発明が解決しようとする課題】図３に示す従来のガラ
スアンテナはＦＭ放送帯（７６〜９０ＭＨｚ）において
受信感度が不足しており、電波の弱い地域では放送を良
好に受信できない問題があった。The conventional glass antenna shown in FIG. 3 has a problem in that the receiving sensitivity is insufficient in the FM broadcasting band (76 to 90 MHz), and the broadcast cannot be received well in an area where radio waves are weak. .
【０００５】図４に図３の従来例の受信感度の周波数特
性を示す。アンテナ導体３２、補助アンテナ導体３３の
寸法はＦＭ放送帯で受信感度が高くなるように調整され
ているものの、図４に示すとおり、１１０ＭＨｚより高
い周波数に受信感度の高い範囲があり、一方、ＦＭ放送
帯では受信感度が低い。FIG. 4 shows a frequency characteristic of the receiving sensitivity of the conventional example shown in FIG. Although the dimensions of the antenna conductor 32 and the auxiliary antenna conductor 33 are adjusted so as to increase the reception sensitivity in the FM broadcast band, as shown in FIG. 4, there is a range where the reception sensitivity is higher at a frequency higher than 110 MHz. The receiving sensitivity is low in the broadcasting band.
【０００６】１１０ＭＨｚより高い周波数に受信感度の
高い範囲ができる原因は、通常、アンテナ導体３２又は
補助アンテナ導体３３と窓ガラス板の窓枠（車体開口
部）とが近接して容量結合しているため、ＦＭ放送帯の
ような高周波帯では車体開口部もアンテナとして機能す
るからであり、車体開口部の共振周波数が１２０ＭＨｚ
であるからである。[0006] The reason why a range with high reception sensitivity is created at a frequency higher than 110 MHz is that the antenna conductor 32 or the auxiliary antenna conductor 33 and the window frame (opening of the vehicle body) of the window glass plate are usually closely coupled to each other. Therefore, in a high frequency band such as an FM broadcasting band, the body opening also functions as an antenna, and the resonance frequency of the body opening is 120 MHz.
Because it is.
【０００７】サイド窓ガラス板等窓の車体開口部が小さ
い場合にはＦＭ放送帯より高い周波数域で車体開口部に
共振し同調しやすく、同調する周波数域以外の周波数域
（この場合はＦＭ放送帯域外）の受信感度が下がる問題
があった。すなわち、窓の車体開口部の大きさに周波数
同調の依存性があり、窓の車体開口部の大きさがアンテ
ナ導体の受信特性に影響を与える。When the body opening of a window such as a side window glass plate is small, it resonates with the body opening in a frequency range higher than the FM broadcasting band and easily tunes, and a frequency range other than the tuning frequency range (in this case, FM broadcasting) (Out-of-band) reception sensitivity. That is, the size of the window body opening has a frequency tuning dependency, and the size of the window body opening affects the reception characteristics of the antenna conductor.
【０００８】また、車体開口部が所望の受信周波数帯内
で共振する場合では、受信周波数帯内において受信感度
の平坦性を確保できない問題があった。また、例えば、
ＲＶ車等では後部窓ガラス板が狭いために、後部窓ガラ
ス板にアンテナ導体を設けうるエリアが小さいため、充
分な受信特性を得られなかった。したがって、小スペー
スに設けることができ充分な受信感度を得られるガラス
アンテナの開発が望まれていた。Further, when the vehicle body opening resonates in a desired reception frequency band, there is a problem that flatness of reception sensitivity cannot be ensured in the reception frequency band. Also, for example,
In an RV car or the like, since the rear window glass plate is narrow and the area where the antenna conductor can be provided on the rear window glass plate is small, sufficient reception characteristics cannot be obtained. Therefore, development of a glass antenna which can be provided in a small space and which can obtain sufficient reception sensitivity has been desired.
【０００９】[0009]
【課題を解決するための手段】本発明は前述の課題を解
決すべくなされたものであり、車両の窓ガラス板に設け
られた給電点と、給電点に接続されたアンテナ導体と、
給電点に接続されていない無給電導体とからなり、無給
電導体の一部又は全部がアンテナ導体と車体開口部との
間に設けられており、アンテナ導体がループ状又は半ル
ープ状であることを特徴とする車両用ガラスアンテナを
提供する。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a power supply point provided on a window glass plate of a vehicle, an antenna conductor connected to the power supply point, and
It consists of a parasitic conductor that is not connected to the feeding point, part or all of the parasitic conductor is provided between the antenna conductor and the vehicle body opening, and the antenna conductor has a loop shape or a half loop shape. A glass antenna for a vehicle is provided.
【００１０】また、本発明は無給電導体がループ状又は
半ループ状であり、無給電導体のループ内にアンテナ導
体の一部又は全部が設けられている上記車両用ガラスア
ンテナを提供する。また、本発明は無給電導体が複数設
けられている上記車両用ガラスアンテナを提供する。ま
た、本発明は複数の無給電導体が互いに接続線により接
続されている上記車両用ガラスアンテナを提供する。ま
た、本発明は車体開口部が所望の受信周波数帯の最低周
波数より高い周波数で共振する上記車両用ガラスアンテ
ナを提供する。[0010] The present invention also provides the above-mentioned glass antenna for a vehicle, wherein the parasitic conductor has a loop shape or a semi-loop shape, and a part or all of the antenna conductor is provided in the loop of the parasitic conductor. Further, the present invention provides the above-mentioned glass antenna for a vehicle, in which a plurality of parasitic conductors are provided. Further, the present invention provides the above-mentioned glass antenna for a vehicle, wherein the plurality of parasitic conductors are connected to each other by connecting wires. Further, the present invention provides the above glass antenna for a vehicle, wherein the vehicle body opening resonates at a frequency higher than the lowest frequency of a desired reception frequency band.
【００１１】[0011]
【発明の実施の形態】以下、本発明を図面にしたがって
詳細に説明する。図１は本発明の車両用ガラスアンテナ
の代表例の構成図である。図１において、２はアンテナ
導体、３は補助アンテナ導体、４ａ、４ｂは無給電導
体、５ａ、５ｂは接続導体、６は給電点、７は車体開口
部である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of a typical example of a glass antenna for a vehicle according to the present invention. In FIG. 1, 2 is an antenna conductor, 3 is an auxiliary antenna conductor, 4a and 4b are parasitic conductors, 5a and 5b are connection conductors, 6 is a feeding point, and 7 is a vehicle body opening.
【００１２】図１ではアンテナ導体２を半ループ状とし
たが、これに限定されず、ループ状のパターンでも本発
明は適用できる。半ループ状とはループの一部が切れて
いることを意味し、ループ全体の１／４程度の長さでも
半ループ状という。In FIG. 1, the antenna conductor 2 is formed in a semi-loop shape. However, the present invention is not limited to this, and the present invention can be applied to a loop-shaped pattern. The half-loop shape means that a part of the loop is broken, and a length of about １ ／ of the entire loop is also called a half-loop shape.
【００１３】アンテナ導体２は給電点と電気的に接続さ
れていることが必要であるが、アンテナ導体２は給電点
と直接に接続されていてもよく、接続用の導体を介して
給電点と接続されていてもよい。図１ではアンテナ導体
２はサイド窓ガラス板１がはめ込まれるべき車体開口部
７に略平行に半ループ状に設けられている。しかし、ア
ンテナ導体２は、必ずしも、サイド窓ガラス板１の車体
開口部７に略平行に設けられていなくともよい。The antenna conductor 2 needs to be electrically connected to the feeding point. However, the antenna conductor 2 may be directly connected to the feeding point, or may be connected to the feeding point via a connecting conductor. It may be connected. In FIG. 1, the antenna conductor 2 is provided in a semi-loop shape substantially parallel to the vehicle body opening 7 into which the side window glass plate 1 is to be fitted. However, the antenna conductor 2 does not necessarily have to be provided substantially parallel to the vehicle body opening 7 of the side window glass plate 1.
【００１４】本発明では、アンテナ導体と車体開口部の
間に無給電導体を付設する。この無給電導体の電気長
（電波の空気中伝搬波長に対応する長さ）は、無給電導
体の導体長をガラス短縮率Ｋで除した値、すなわち、無
給電導体の導体長／ガラス短縮率Ｋとなり、見かけ上車
体開口部が大きくなるため、従来例の車体開口部より低
い周波数に同調しやすく、ＦＭ放送帯やテレビＶＨＦ帯
の受信感度が向上し、充分な受信特性が得られる。な
お、ガラス短縮率Ｋは、通常、０．６４である。In the present invention, a parasitic conductor is provided between the antenna conductor and the vehicle body opening. The electrical length of the parasitic conductor (the length corresponding to the propagation wavelength of radio waves in air) is a value obtained by dividing the conductor length of the parasitic conductor by the glass shortening rate K, that is, the conductor length of the parasitic conductor / the glass shortening rate. K, the opening of the vehicle body becomes apparently large, so that it is easy to tune to a lower frequency than the conventional vehicle body opening, the receiving sensitivity in the FM broadcasting band or the television VHF band is improved, and sufficient receiving characteristics can be obtained. The glass shortening rate K is usually 0.64.
【００１５】図１では無給電導体４ａ、４ｂはアンテナ
導体２と車体開口部７との間に略平行に半ループ状に設
けられている。しかし、無給電導体４ａ、４ｂは１又は
複数の直線状、曲線状又はループ状でもよく、必ずし
も、サイド窓ガラス板１の車体開口部７に略平行に設け
られていなくともよい。また、図１では無給電導体を２
本付設しているが、これに限らず１本でも３本以上でも
よい。In FIG. 1, the parasitic conductors 4a and 4b are provided between the antenna conductor 2 and the vehicle body opening 7 in a substantially parallel loop shape. However, the parasitic conductors 4a and 4b may be formed in one or a plurality of straight lines, curved lines or loops, and may not necessarily be provided substantially parallel to the vehicle body opening 7 of the side window glass plate 1. Also, in FIG.
Although this is provided, the number is not limited to this and may be one or three or more.
【００１６】すなわち、無給電導体のパターン形状は特
に限定されず、無給電導体の一部又は全部がアンテナ導
体と車体開口部との間に設けられていれば使用できる。
ただし、無給電導体の大部分がアンテナ導体と車体開口
部との間に設けられていることが受信感度向上の面で好
ましい。したがって、アンテナ導体２が半ループ状又は
ループ状の導体パターンであれば、無給電導体も半ルー
プ状又はループ状の導体パターンとすることが受信感度
向上の面で好ましい。That is, the pattern shape of the parasitic conductor is not particularly limited, and it can be used as long as part or all of the parasitic conductor is provided between the antenna conductor and the vehicle body opening.
However, it is preferable that most of the parasitic conductor is provided between the antenna conductor and the vehicle body opening from the viewpoint of improving the receiving sensitivity. Therefore, if the antenna conductor 2 is a semi-loop or loop-shaped conductor pattern, it is preferable that the parasitic conductor also be a semi-loop or loop-shaped conductor pattern from the viewpoint of improving reception sensitivity.
【００１７】図１では無給電導体４ａと無給電導体４ｂ
とを接続導体５ａ、５ｂにより接続している。しかし、
これに限定されず、無給電導体４ａと無給電導体４ｂと
を接続しなくともよい。要するに、無給電導体を複数設
けた場合には、それぞれの無給電導体を接続しなくても
使用できる。FIG. 1 shows a parasitic conductor 4a and a parasitic conductor 4b.
Are connected by connecting conductors 5a and 5b. But,
The present invention is not limited to this, and the parasitic conductor 4a and the parasitic conductor 4b need not be connected. In short, when a plurality of parasitic conductors are provided, they can be used without connecting each parasitic conductor.
【００１８】補助アンテナ導体３は必要に応じてアンテ
ナ導体２に設けられる。補助アンテナ導体３を設ける場
合は、設けない場合と比較して数ｄＢ受信感度が向上す
るので好ましい。また、図１では補助アンテナ導体３は
アンテナ導体２の内側に設けられている。しかし、これ
に限定されず、アンテナ導体２の外側に設けられてもよ
い。The auxiliary antenna conductor 3 is provided on the antenna conductor 2 as required. The case where the auxiliary antenna conductor 3 is provided is preferable because the reception sensitivity is improved by several dB as compared with the case where the auxiliary antenna conductor 3 is not provided. In FIG. 1, the auxiliary antenna conductor 3 is provided inside the antenna conductor 2. However, the present invention is not limited to this, and may be provided outside the antenna conductor 2.
【００１９】また、アンテナ導体２、補助アンテナ導体
３及び無給電導体４ａ、４ｂの導体長は、それぞれ、所
望の受信周波数帯の中心周波数の波長をλとしたとき、
（λ／４）×Ｋ〜２λ×Ｋの範囲が望ましい。この範囲
内である場合には、この範囲外である場合と比較して数
ｄＢ受信感度が向上する。The conductor lengths of the antenna conductor 2, the auxiliary antenna conductor 3, and the parasitic conductors 4a and 4b are respectively defined assuming that the wavelength of the center frequency of the desired reception frequency band is λ.
The range of (λ / 4) × K to 2λ × K is desirable. When it is within this range, the receiving sensitivity is improved by several dB as compared with the case where it is outside this range.
【００２０】本発明において、アンテナ導体及び補助ア
ンテナ導体の少なくとも一方と無給電導体とが容量結合
され、無給電導体と車体開口部とは容量結合される。し
たがって、アンテナ導体及び補助アンテナ導体と車体開
口部とは無給電導体を介して容量結合されている。アン
テナ導体及び補助アンテナ導体の少なくとも一方と無給
電導体との最短距離は、通常、５０ｍｍ以下であり、無
給電導体と車体開口部との最短距離は、通常、５０ｍｍ
以下である。In the present invention, at least one of the antenna conductor and the auxiliary antenna conductor is capacitively coupled to the parasitic conductor, and the parasitic conductor and the vehicle body opening are capacitively coupled. Therefore, the antenna conductor and the auxiliary antenna conductor are capacitively coupled to the vehicle body opening through the parasitic conductor. The shortest distance between at least one of the antenna conductor and the auxiliary antenna conductor and the parasitic conductor is usually 50 mm or less, and the shortest distance between the parasitic conductor and the vehicle body opening is usually 50 mm.
It is as follows.
【００２１】車体開口部の周囲の長さにより車体開口部
の共振周波数が決定されるが、車体開口部の周囲の長さ
は特に限定されない。しかし、車体開口部が所望の受信
周波数帯の最低周波数より高い周波数（例えば、ＦＭ放
送帯であれば７６ＭＨｚ以上）で共振することが受信感
度が向上し好ましい。The resonance frequency of the vehicle body opening is determined by the length around the vehicle body opening, but the peripheral length of the vehicle body opening is not particularly limited. However, it is preferable that the body opening resonates at a frequency higher than the lowest frequency of the desired reception frequency band (for example, 76 MHz or more in the case of the FM broadcast band) because the reception sensitivity is improved.
【００２２】車体開口部が所望の受信周波数帯の最高周
波数より高い周波数（例えば、ＦＭ放送帯であれば９０
ＭＨｚ以上）で共振することが受信感度が向上し、より
好ましく、さらに、車体開口部が所望の受信周波数帯の
最高周波数の１２０％（例えば、ＦＭ放送帯であれば最
高周波数が９０ＭＨｚであるから、１０８ＭＨｚ以上）
より高い周波数で共振することが受信感度が向上し、特
に好ましい。If the vehicle body opening has a frequency higher than the highest frequency of the desired receiving frequency band (for example, 90
It is more preferable to resonate at a frequency of at least MHz, since the receiving sensitivity is improved, and furthermore, the opening of the vehicle body is 120% of the highest frequency of the desired receiving frequency band (for example, the highest frequency is 90 MHz in the FM broadcasting band). , 108MHz or higher)
Resonating at a higher frequency improves reception sensitivity and is particularly preferable.
【００２３】本発明において、車体開口部が所望の受信
周波数帯の最低周波数より高い周波数で共振する場合に
は、無給電導体を設ける場合は無給電導体を設けない場
合と比較して、通常、１ｄＢ以上受信感度が向上する。In the present invention, when the vehicle body opening resonates at a frequency higher than the lowest frequency in the desired reception frequency band, the case where the parasitic conductor is provided is generally more in comparison with the case where the parasitic conductor is not provided. The reception sensitivity is improved by 1 dB or more.
【００２４】車体開口部が所望の受信周波数帯の最高周
波数より高い周波数で共振する場合には、無給電導体を
設ける場合は無給電導体を設けない場合と比較して、通
常、２ｄＢ以上受信感度が向上する。When the opening of the vehicle body resonates at a frequency higher than the highest frequency in the desired receiving frequency band, the receiving sensitivity is usually 2 dB or more when the parasitic conductor is provided as compared with the case where the parasitic conductor is not provided. Is improved.
【００２５】車体開口部が所望の受信周波数帯の最高周
波数の１２０％より高い周波数で共振する場合には、無
給電導体を設ける場合は無給電導体を設けない場合と比
較して、通常、３ｄＢ以上受信感度が向上する。When the opening of the vehicle body resonates at a frequency higher than 120% of the highest frequency in the desired receiving frequency band, the case where the parasitic conductor is provided is usually 3 dB compared with the case where the parasitic conductor is not provided. As described above, the receiving sensitivity is improved.
【００２６】したがって、車体開口部の周囲の長さの好
ましい範囲は、所望の受信周波数帯の最低周波数の波長
以下である。例えば、所望の受信周波数帯がＦＭ放送帯
である場合には、最低周波数が７６ＭＨｚであるから、
車体開口部の周囲の長さのより好ましい範囲は、３９４
７ｍｍ以下である。Therefore, the preferable range of the length around the opening of the vehicle body is equal to or less than the wavelength of the lowest frequency in the desired receiving frequency band. For example, if the desired reception frequency band is the FM broadcast band, the lowest frequency is 76 MHz,
A more preferred range of the perimeter of the vehicle body opening is 394
7 mm or less.
【００２７】車体開口部の周囲の長さのより好ましい範
囲は、所望の受信周波数帯の最高周波数の波長以下であ
る。例えば、所望の受信周波数帯がＦＭ放送帯である場
合には、最高周波数が９０ＭＨｚであるから、車体開口
部の周囲の長さのより好ましい範囲は、３３３３ｍｍ以
下である。A more preferable range of the perimeter of the vehicle body opening is not more than the wavelength of the highest frequency in the desired reception frequency band. For example, when the desired reception frequency band is the FM broadcast band, the highest frequency is 90 MHz, so the more preferable range of the length around the vehicle body opening is 3333 mm or less.
【００２８】車体開口部の周囲の長さの特に好ましい範
囲は、所望の受信周波数帯の最高周波数の波長の１２０
％以下である。例えば、所望の受信周波数帯がＦＭ放送
帯である場合には、最高周波数の１２０％より高い周波
数が１０８ＭＨｚであるから、車体開口部の周囲の長さ
の特に好ましい範囲は、２７７８ｍｍ以下である。A particularly preferred range of the circumference of the vehicle body opening is 120 nm of the wavelength of the highest frequency in the desired reception frequency band.
% Or less. For example, when the desired receiving frequency band is the FM broadcasting band, the frequency higher than 120% of the highest frequency is 108 MHz, and the particularly preferable range of the length around the vehicle body opening is 2778 mm or less.
【００２９】受信感度が向上のために、アンテナ導体、
補助アンテナ導体及び無給電導体の少なくとも１つに、
略Ｔ字状、略Ｌ字状、ループ状等の形状の位相調整エレ
メントを１本又は複数本設けてもよい。In order to improve the receiving sensitivity, an antenna conductor
In at least one of the auxiliary antenna conductor and the parasitic conductor,
One or a plurality of phase adjustment elements having a substantially T-shaped, substantially L-shaped, or loop shape may be provided.
【００３０】本発明において、車体開口部とは窓ガラス
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。In the present invention, the vehicle body opening means an opening of the vehicle body into which the window glass plate is to be fitted, which is to serve as a vehicle body ground, and is made of a conductive material such as metal.
【００３１】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車体開口部が小さいことが好まし
い。ＦＭ放送帯の最低周波数より高い周波数で共振する
からである。このことよりサイド窓ガラス板、特に後部
サイド窓ガラス板が受信感度向上のためには最も適す
る。しかし、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, it is preferable that the window glass plate on which the antenna conductor is provided has a small vehicle body opening. This is because resonance occurs at a frequency higher than the lowest frequency of the FM broadcast band. For this reason, the side window glass plate, particularly the rear side window glass plate, is most suitable for improving the receiving sensitivity. However, it is not limited to the side window glass plate, and may be a rear window glass plate, a front window glass plate, a roof window glass plate, or the like.
【００３２】また、本発明のガラスアンテナを車両の片
側の例えばサイド窓ガラス板に設けてもよい。しかし、
両側のサイド窓ガラス板に設け、両ガラスアンテナ間で
ダイバーシティ受信を行うことが指向性向上のために好
ましい。The glass antenna of the present invention may be provided on one side of a vehicle, for example, on a side window glass plate. But,
It is preferable to provide the antenna on both side window glass plates and perform diversity reception between both glass antennas in order to improve directivity.
【００３３】前置増幅器９は必要に応じて設けられるも
のであり、受信感度が向上に寄与する。しかし、受信感
度が充分に大きければ設ける必要はない。The preamplifier 9 is provided as needed, and contributes to improvement of the receiving sensitivity. However, if the receiving sensitivity is sufficiently large, it is not necessary to provide the receiving sensitivity.
【００３４】給電点６の位置については、受信特性上は
特に制限は受けにくいが、視界確保のためには極力窓ガ
ラス板の周縁部付近に設けられることが望ましい。ま
た、図１では給電点６はサイド窓ガラス板１の左上周縁
部に付設されている。しかし、これに限定されず、サイ
ド窓ガラス板１のどの位置に付設されていてもよく、例
えば、サイド窓ガラス板１の左右中央の上下周縁部に付
設されていてもよい。The position of the feeding point 6 is not particularly limited in terms of reception characteristics, but is preferably provided as close to the periphery of the window glass plate as possible in order to ensure visibility. In FIG. 1, the feeding point 6 is provided on the upper left peripheral edge of the side window glass plate 1. However, the present invention is not limited to this, and it may be provided at any position of the side window glass plate 1, for example, may be provided at the upper and lower peripheral edges of the left and right center of the side window glass plate 1.
【００３５】アンテナ導体、補助アンテナ導体、無給電
導体及び給電点の導体パターンには、銀ペーストを窓ガ
ラス板に印刷し、焼成したものを、通常、使用する。し
かし、これに限定されず、他の金属ペーストであっても
使用できる他、銅等の金属線、金属板又は金属箔を窓ガ
ラス板に接着剤等により接着等してもよい。As the antenna conductor, the auxiliary antenna conductor, the parasitic conductor, and the conductor pattern of the feeding point, a silver paste printed on a window glass plate and fired is usually used. However, the present invention is not limited to this, and other metal pastes may be used, and a metal wire such as copper, a metal plate or a metal foil may be bonded to the window glass plate with an adhesive or the like.
【００３６】また、窓ガラス板に設けられるアンテナ導
体は、ＡＭラジオ放送帯用、ＦＭラジオ放送帯用、テレ
ビＶＨＦ帯用、テレビＵＨＦ帯用等に応用でき、特に限
定されない。しかし、ＦＭラジオ放送帯用、テレビＶＨ
Ｆ帯用とすることが受信感度が向上に寄与し好ましい。The antenna conductor provided on the window glass plate can be applied to an AM radio broadcasting band, an FM radio broadcasting band, a television VHF band, a television UHF band, and the like, and is not particularly limited. However, for FM radio broadcasting band, TV VH
The use in the F band is preferable because the reception sensitivity is improved.
【００３７】また、本発明においては、車両用に設けら
れるアンテナ導体の数は限定されず、また、本発明のガ
ラスアンテナと、ポールアンテナ、他のガラスアンテナ
等の他の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 number of antenna conductors provided for a vehicle is not limited, and a diversity is provided between the glass antenna of the present invention and another antenna such as a pole antenna, another glass antenna, or the like. Reception may be performed.
【００３８】図５〜図７に図１とは別のタイプの本発明
の構成図を示す。なお、図５〜図７では、図１と同一構
成要素又は同一部材については、同符号を付して、説明
を省略する。図５〜図７では、リード線８、前置増幅器
９、同軸ケーブル１０は図示を省略している。FIGS. 5 to 7 show another type of configuration of the present invention different from FIG. 5 to 7, the same components or members as those in FIG. 1 are denoted by the same reference numerals and description thereof will be omitted. 5 to 7, the lead wire 8, the preamplifier 9, and the coaxial cable 10 are not shown.
【００３９】図５では、アンテナ導体２をループ状と
し、補助アンテナ導体３を半ループ状としている。無給
電導体４ａ、４ｂは２本の半ループ状であり、接続導体
５ａは１本である。In FIG. 5, the antenna conductor 2 has a loop shape, and the auxiliary antenna conductor 3 has a half loop shape. The parasitic conductors 4a and 4b are in the form of two half loops, and the connecting conductor 5a is one.
【００４０】図６では、アンテナ導体２をループ状と
し、補助アンテナ導体３を半ループ状としている。無給
電導体４ａ、４ｂは２本のループ状であり、接続導体は
設けていない。In FIG. 6, the antenna conductor 2 has a loop shape, and the auxiliary antenna conductor 3 has a half loop shape. The parasitic conductors 4a and 4b are in the form of two loops, and have no connection conductor.
【００４１】図７では、アンテナ導体２、補助アンテナ
導体３をともに半ループ状としている。無給電導体４ａ
はループ状、４ｂは半ループ状であり、接続導体は設け
ていない。In FIG. 7, both the antenna conductor 2 and the auxiliary antenna conductor 3 are formed in a half loop. Parasitic conductor 4a
Is a loop shape, 4b is a half loop shape, and no connection conductor is provided.
【００４２】[0042]
【実施例】実施例として、図１のような車両用ガラスア
ンテナを製作した。サイド窓ガラス板１は自動車左側の
ものを使用し、図３に示すものと同じものを使用した。
サイド窓ガラス板１の寸法は略縦方向４５０ｍｍ、略横
方向８００ｍｍ、車体開口部の周囲の長さは２５００ｍ
ｍとした。したがって、車体開口部の共振周波数は１２
０ＭＨｚであった。EXAMPLE As an example, a glass antenna for a vehicle as shown in FIG. 1 was manufactured. The side window glass plate 1 was the one on the left side of the vehicle, and the same one as shown in FIG.
The size of the side window glass plate 1 is approximately 450 mm in the vertical direction, approximately 800 mm in the horizontal direction, and the length around the opening of the vehicle body is 2500 m.
m. Therefore, the resonance frequency of the vehicle body opening is 12
It was 0 MHz.
【００４３】アンテナ導体２の導体長は１０００ｍｍ、
補助アンテナ導体３の導体長は１５００ｍｍ、無給電導
体４ａ、４ｂの導体長はそれぞれ１７００ｍｍ、１９０
０ｍｍとし、各導体の間隔は２５ｍｍとした。無給電導
体４ｂと車体開口部との最短距離は３０ｍｍとした。給
電点６は正方形とし、その寸法は１５ｍｍ×１５ｍｍと
した。The conductor length of the antenna conductor 2 is 1000 mm,
The conductor length of the auxiliary antenna conductor 3 is 1500 mm, and the conductor lengths of the parasitic antennas 4a and 4b are 1700 mm and 190, respectively.
The distance between conductors was 25 mm. The shortest distance between the parasitic conductor 4b and the vehicle body opening was 30 mm. The feeding point 6 was a square, and its size was 15 mm × 15 mm.
【００４４】実施例のアンテナ受信感度の周波数特性を
図２に示す。図２よりわかるとおり、ＦＭ放送帯におい
て受信感度が高い。FIG. 2 shows the frequency characteristics of the antenna reception sensitivity of the embodiment. As can be seen from FIG. 2, the reception sensitivity is high in the FM broadcast band.
【００４５】[0045]
【発明の効果】本発明では無給電導体の一部又は全部が
アンテナ導体と車体開口部との間に設けられているた
め、車体開口部がアンテナ導体の受信特性に影響を与え
ることが少ない。According to the present invention, since a part or all of the parasitic conductor is provided between the antenna conductor and the vehicle body opening, the vehicle body opening hardly affects the reception characteristics of the antenna conductor.
【００４６】したがって、例えば、車体開口部が小さい
場合であって車体開口部が所望の受信周波数帯以外の周
波数域に共振する場合であっても、アンテナ導体の受信
特性に影響を与えることが少なく、受信感度を向上でき
る。また、車体開口部が所望の受信周波数帯内で共振す
る場合では、受信周波数帯内において受信感度の平坦性
を確保できる。Therefore, for example, even when the vehicle body opening is small and the vehicle body opening resonates in a frequency range other than the desired reception frequency band, the reception characteristics of the antenna conductor are hardly affected. The receiving sensitivity can be improved. Further, when the vehicle body opening resonates in a desired reception frequency band, flatness of reception sensitivity can be ensured in the reception frequency band.
【００４７】本発明を自動車のサイド窓ガラス板等の小
さい窓ガラス板に適用した場合、特にＦＭ放送、テレビ
ＶＨＦ帯等の高周波帯の受信感度を向上できる。When the present invention is applied to a small window glass plate such as a side window glass plate of an automobile, it is possible to improve reception sensitivity particularly in a high frequency band such as an FM broadcast and a television VHF band.
【図１】本発明の車両用ガラスアンテナの代表例の構成
図FIG. 1 is a configuration diagram of a typical example of a glass antenna for a vehicle according to the present invention.
【図２】図１の代表例の受信感度の周波数特性図FIG. 2 is a diagram showing frequency characteristics of reception sensitivity of the representative example of FIG. 1;
【図３】従来例の構成図FIG. 3 is a configuration diagram of a conventional example.
【図４】図３の従来例の受信感度の周波数特性図FIG. 4 is a frequency characteristic diagram of the receiving sensitivity of the conventional example of FIG. 3;
【図５】図１とは別のタイプの本発明の構成図FIG. 5 is a block diagram of another type of the present invention different from FIG. 1;
【図６】図１とは別のタイプの本発明の構成図FIG. 6 is a block diagram of another type of the present invention different from FIG. 1;
【図７】図１とは別のタイプの本発明の構成図FIG. 7 is a block diagram of another type of the present invention different from FIG. 1;
１：サイド窓ガラス板 ２：アンテナ導体 ３：補助アンテナ導体 ４ａ、４ｂ：無給電導体 ５ａ、５ｂ：接続導体 ６：給電点 ７：車体開口部 ８：リード線 ９：前置増幅器 １０：同軸ケーブル 1: Side window glass plate 2: Antenna conductor 3: Auxiliary antenna conductor 4a, 4b: Parasitic conductor 5a, 5b: Connection conductor 6: Feeding point 7: Body opening 8: Lead wire 9: Preamplifier 10: Coaxial cable
Claims (5)
給電点に接続されたアンテナ導体と、給電点に接続され
ていない無給電導体とからなり、 無給電導体の一部又は全部がアンテナ導体と車体開口部
との間に設けられており、アンテナ導体がループ状又は
半ループ状であることを特徴とする車両用ガラスアンテ
ナ。A power supply point provided on a window glass plate of a vehicle;
An antenna conductor connected to the feeding point and a parasitic conductor not connected to the feeding point, wherein a part or all of the parasitic conductor is provided between the antenna conductor and the vehicle body opening; Is a loop-shaped or semi-loop-shaped glass antenna for vehicles.
り、無給電導体のループ内にアンテナ導体の一部又は全
部が設けられている請求項１の車両用ガラスアンテナ。2. The glass antenna for a vehicle according to claim 1, wherein the parasitic conductor has a loop shape or a semi-loop shape, and a part or all of the antenna conductor is provided in a loop of the parasitic conductor.
又は２の車両用ガラスアンテナ。3. The apparatus according to claim 1, wherein a plurality of parasitic conductors are provided.
Or the glass antenna for vehicles of 2.
続されている請求項３の車両用ガラスアンテナ。4. The glass antenna for a vehicle according to claim 3, wherein a plurality of parasitic conductors are connected to each other by a connection line.
波数より高い周波数で共振する請求項１、２、３又は４
の車両用ガラスアンテナ。5. The vehicle body opening resonates at a frequency higher than the lowest frequency of a desired reception frequency band.
Vehicle glass antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31819496A JPH10163727A (en) | 1996-11-28 | 1996-11-28 | Glass antenna for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31819496A JPH10163727A (en) | 1996-11-28 | 1996-11-28 | Glass antenna for vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10163727A true JPH10163727A (en) | 1998-06-19 |
Family
ID=18096500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31819496A Withdrawn JPH10163727A (en) | 1996-11-28 | 1996-11-28 | Glass antenna for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10163727A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1589606A1 (en) * | 2004-04-22 | 2005-10-26 | Ask Industries S.p.A. | A passive wirelike structure for increasing the gain of a window antenna |
-
1996
- 1996-11-28 JP JP31819496A patent/JPH10163727A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1589606A1 (en) * | 2004-04-22 | 2005-10-26 | Ask Industries S.p.A. | A passive wirelike structure for increasing the gain of a window antenna |
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