Through-glass antenna for automobile radio

Abstract

Abstract PURPOSE:To mount an antenna without making a hole to a car body by providing an FM resonance circuit comprising a spiral coil and a capacitor, a band pass filter, a capacitor electrode and an AM impedance converter so as to form the antenna. CONSTITUTION:Resonance circuits 11, 12 resonated in the FM frequency are formed to both the antenna and output sides in the operation relating to an FM frequency signal to form a dual tuning circuit by means of electromagnetic coupling. Thus, the FM frequency band is covered and its coupling circuit is formed to be in operation at a broad band frequency. Then the coupling static capacitance is formed by capacitor electrodes 13, 14 in the operation relating to the AM frequency signal. An impedance converter employing a FET is inserted to an output terminal of the coupling static capacitor, a signal is extracted by using a high impedance input as a low impedance output and connects to a feeder 41. Thus, the capacitance split loss is almost eliminated and the AM frequency signal is practically received.

Inventors

• 👤 Kazuhiko Nakase
• 👤 一彦 仲瀬
• 👤 Moriyoshi Kawasaki
• 👤 河崎　守良

Bibliographic Details