JPS6455712U - - Google Patents
Info
- Publication number
- JPS6455712U JPS6455712U JP14995287U JP14995287U JPS6455712U JP S6455712 U JPS6455712 U JP S6455712U JP 14995287 U JP14995287 U JP 14995287U JP 14995287 U JP14995287 U JP 14995287U JP S6455712 U JPS6455712 U JP S6455712U
- Authority
- JP
- Japan
- Prior art keywords
- antenna element
- tube
- extended
- end part
- storage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Details Of Aerials (AREA)
Description
第１図は本考案の一実施例のホイツプアンテナ
２１の伸長時の断面図、第２図は第１図の切断面
線−から見た断面図、第３図は第１図の切断
面線−から見た断面図、第４図は先行技術の
ホイツプアンテナ１の伸長時の断面図、第５図は
ホイツプアンテナ１，２１が周波数変調放送の受
信に用いられるときの等価回路図、第６図はホイ
ツプアンテナ１，２１が振幅変調放送の受信に用
いられるときの等価回路図である。
２０……下端部、２０ａ……第１下端部、２０
ｂ……第２下端部、２１……ホイツプアンテナ、
２２……車体、２３……アンテナエレメント、２
４……第１部分、２５……第２部分、２６……収
納筒、２７……内筒、２８……外筒、２８ａ……
第１外筒部分、２８ｂ……第２外筒部分、３０…
…接触片、３１……同軸ケーブル、４１……取付
孔。
FIG. 1 is a cross-sectional view of a whip antenna 21 according to an embodiment of the present invention when it is extended, FIG. 2 is a cross-sectional view taken along the cutting plane line - in FIG. 1, and FIG. 3 is a cross-sectional view taken along the cutting plane line - in FIG. 1. 4 is a sectional view of the prior art whip antenna 1 when it is extended. FIG. 5 is an equivalent circuit diagram when the whip antennas 1 and 21 are used for receiving frequency modulation broadcasting. FIG. 6 is a whip antenna 1 and 21 are equivalent circuit diagrams when used for receiving amplitude modulated broadcasting. 20...lower end portion, 20a...first lower end portion, 20
b... Second lower end portion, 21... Whip antenna,
22...Vehicle body, 23...Antenna element, 2
4...First part, 25... Second part, 26... Storage tube, 27... Inner tube, 28... Outer tube, 28a...
First outer cylinder part, 28b... Second outer cylinder part, 30...
...Contact piece, 31...Coaxial cable, 41...Mounting hole.
Claims (1)
、 前記収納筒内で、収納筒と電気的に絶縁されて
、収納筒から上方へ望遠鏡状に伸縮可能であるア
ンテナエレメントと、 前記アンテナエレメントが収納筒から上方に引
出されて伸長された状態で、該アンテナエレメン
トの下端部と電気的に接続されるケーブルとを含
む車載用アンテナにおいて、 前記アンテナエレメントの伸長時における収納
筒内にある下端部は、アンテナエレメントの伸長
時における収納筒上方の部分よりも小径である第
１下端部と、この第１下端部の下方に連なり該第
１下端部よりも大径の第２下端部とを有し、 前記収納筒は、アンテナエレメント伸長時にお
ける第１下端部を電気絶縁性筒体を介して囲む第
１外筒部分と、この第１外筒部分に連なり該第１
外筒部分よりも大きい内径を有し、前記第２下端
部を電気絶縁性筒体を介して囲む第２外筒部分と
を有し、 前記第１下端部と第１外筒部分とによる特性イ
ンピーダンスと、前記第２下端部と第２外筒部分
とによる特性インピーダンスと、アンテナエレメ
ントおよび前記第２下端部に接続されるケーブル
の特性インピーダンスとを等しくすることを特徴
とする車載用アンテナ。[Scope of Claim for Utility Model Registration] A storage tube that is connected and fixed to the body of an automobile, and that is electrically insulated from the storage tube and can be expanded and contracted upward from the storage tube in a telescopic shape. An on-vehicle antenna comprising an antenna element and a cable electrically connected to a lower end of the antenna element when the antenna element is pulled out upward from a storage tube and extended, when the antenna element is extended. The lower end part located inside the storage cylinder in , includes a first lower end part that has a smaller diameter than the upper part of the storage cylinder when the antenna element is extended, and a first lower end part that extends below the first lower end part and has a diameter larger than the first lower end part. and a second lower end portion of the housing tube, the housing tube has a first outer tube portion that surrounds the first lower end portion when the antenna element is extended via an electrically insulating tube body, and a first outer tube portion that is continuous with the first outer tube portion and has a second outer tube portion that surrounds the first lower end portion when the antenna element is extended. 1st
a second outer cylinder part that has a larger inner diameter than the outer cylinder part and surrounds the second lower end part via an electrically insulating cylinder, and characteristics due to the first lower end part and the first outer cylinder part. An on-vehicle antenna characterized in that an impedance, a characteristic impedance due to the second lower end portion and the second outer cylinder portion, and a characteristic impedance of a cable connected to the antenna element and the second lower end portion are equal to each other.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14995287U JPH0546330Y2 (en) | 1987-09-30 | 1987-09-30 | |
| US07/249,556 US5072230A (en) | 1987-09-30 | 1988-09-26 | Mobile telescoping whip antenna with impedance matched feed sections |
| CA000578830A CA1314324C (en) | 1987-09-30 | 1988-09-29 | Transmission and reception apparatus for automobile |
| DE3833288A DE3833288C2 (en) | 1987-09-30 | 1988-09-30 | MULTI-BAND ROD ANTENNA FOR MOTOR VEHICLES |
| DE3844541A DE3844541C2 (en) | 1987-09-30 | 1988-09-30 | Antenna circuit for a multiband antenna |
| CA000616023A CA1313694C (en) | 1987-09-30 | 1991-03-15 | Transmission and reception apparatus for automobile |
| US07/697,624 US5258728A (en) | 1987-09-30 | 1991-05-09 | Antenna circuit for a multi-band antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14995287U JPH0546330Y2 (en) | 1987-09-30 | 1987-09-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6455712U true JPS6455712U (en) | 1989-04-06 |
| JPH0546330Y2 JPH0546330Y2 (en) | 1993-12-03 |
Family
ID=31422650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14995287U Expired - Lifetime JPH0546330Y2 (en) | 1987-09-30 | 1987-09-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0546330Y2 (en) |
-
1987
- 1987-09-30 JP JP14995287U patent/JPH0546330Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0546330Y2 (en) | 1993-12-03 |
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