Communications: radio wave antennas – Antennas – With lumped reactance filter in active antenna
Patent
1990-11-15
1992-09-29
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With lumped reactance filter in active antenna
343858, 455293, H01Q 100
Patent
active
051517086
ABSTRACT:
An automobile mast antenna used in a state shorter than its resonant state including an FM compensating circuit made only of passive elements and compensating for FM signals and an AM compensating circuit made of active elements that convert high impedance into low impedance and compensating for AM signals. The FM compensating circuit is formed with a primary resonance circuit and a secondary resonance circuit, in which the primary resonance circuit resonates in FM band via impedance of an antenna mast and loading coil which is attached to the antenna mast, and the secondary resonance circuit resonates in FM band via a coil and capacitor. The primary and secondary resonance circuits are coupled by electrostatic capacitance of attachment section of the antenna mast so as to form a double-tuned circuit.
Kawasaki Moriyoshi
Nakase Kazuhiko
Harada Kogyo Kabushiki Kaisha
Le Hoang-anh
Wimer Michael C.
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