Three-wave shared antenna (radio, AM, and FM) for automobile

Details Three-wave shared antenna (radio, AM, and FM) for automobile Three-wave shared antenna (radio, AM, and FM) for automobile

1990-11-09

1992-07-28

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With lumped reactance filter in active antenna

343715, 343901, H01Q 100

Patent

active

051344190

ABSTRACT:
A three-wave shared antenna used in an automobile comprises an MT wave element 10A wherein first and second phasing coils 11 and 12 are formed in an intermediate position of a conductive mast thereby forming the MT wave element 10A is formed in a three-step collinear manner to be able to transmit/receive an MT wave, a trap element 10B for interrupting the MT wave formed on top portion of the MT wave element 10A, and an auxiliary element 10C for AM and FM waves, which comprises another conductive mast connected to said conductive mast through the trap element 10B to be able to receive AM wave, which is a broadcast wave of an amplitude modulation system and FM wave, which is a broadcast wave of a frequency modulation system, in cooperation with said MT wave element. Then, the electrical length of said auxiliary element 10C for AM and FM waves is set to (3/4) wavelength of the electrical wave of the frequency close to the frequency of the transmission side in a radio telephone band, and the electrical length of said MT wave element 10A is set to an electrical length in which the sum L of the length of said MT wave element 10A and that of said auxiliary element 10C for AM and FM waves adjusts to the reception of the FM wave.

REFERENCES:
patent: 4095229 (1978-06-01), Elliott
patent: 4675687 (1987-06-01), Elliott
patent: 4721965 (1988-01-01), Elliott
patent: 4734703 (1988-03-01), Nakase et al.
patent: 5017935 (1991-05-01), Hayashi et al.

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