Claims
- 1. A glass antenna system for an automobile comprising:
- two main matching circuits each connected to an antenna provided on a window glass of the automobile, each of said main matching circuits including a first coil and a first varactor diode connected thereto, to provide first resonance circuits, and
- two auxiliary matching circuits each connected to one of said main matching circuits through a common node, each of said auxiliary matching circuits including a second coil and a second varactor diode connected thereto, to provide second resonance circuits;
- a capacitor connected between two of said common node;
- a transmission cable operatively connected to said auxiliary matching circuits through an output terminal; and
- resistors each connected to said output terminal and each applying a voltage to said second varactor diode through said second coil.
- 2. A glass antenna system for an automobile comprising:
- a main matching circuit connected to an antenna provided on a window glass of the automobile, said main matching circuit including a first coil and a first pair of cathode-common varactor diodes connected thereto, to provide first resonance circuits; and
- an auxiliary matching circuit connected to said main matching circuit through a common node, said auxiliary matching circuit including a second coil and a second pair of varactor diodes having a common cathode connected thereto, to provide second resonance circuits;
- a capacitor connected between said common node and ground;
- a transmission cable operatively connected to said auxiliary matching circuit through an output terminal; and
- resistors each connected between said output terminal and said common cathode.
Priority Claims (2)
Number |
Date |
Country |
Kind |
3-086282 |
Mar 1991 |
JPX |
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3-086284 |
Mar 1991 |
JPX |
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Parent Case Info
This application is a divisional of application Ser. No. 08/459,533, filed Jun. 2, 1995, now U.S. Pat. No. 5,602,558, which in turn is a continuation of application Ser. No. 08/269,632, filed Jul. 1, 1994, now abandoned, which in turn is a continuation of application Ser. No. 07/857,377, filed Mar. 25, 1992, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0 021 762 |
Jan 1981 |
EPX |
0 367 555 |
May 1990 |
EPX |
50-124041 |
Aug 1974 |
JPX |
52-33233 |
Aug 1975 |
JPX |
58-50833 |
Mar 1983 |
JPX |
58-69131 |
Apr 1983 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Sheffield, Berthold, "Filter Design Simplified", Audio Engineering, Mar. 1951, pp. 13-14 & 34-36. |
Divisions (1)
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Number |
Date |
Country |
Parent |
459533 |
Jun 1995 |
|
Continuations (2)
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Number |
Date |
Country |
Parent |
269632 |
Jul 1994 |
|
Parent |
857377 |
Mar 1992 |
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