FM-AM windshield antenna

Details FM-AM windshield antenna FM-AM windshield antenna

1974-11-29

1976-07-27

Lieberman, Eli

Communications: radio wave antennas

Antennas

With vehicle

343742, H01Q 132

Patent

active

039720489

ABSTRACT:
A conductive body having an opening therein, the edge of opening having a length which is less than a resonant length at AM broadcast band frequencies and greater than a resonant length at FM broadcast band frequencies, is caused to operate as an effective antenna over the FM band or over both the FM and AM bands by electrically shortening the length of the edge of such opening at FM frequencies without physically shortening the perimeter of such opening or electrically shortening the edge of such opening at AM frequencies, a common cable or cables being utilized to couple both AM and FM signals to external circuits, switching at the conductive edge thus being eliminated.

REFERENCES:
patent: 2923813 (1960-02-01), Davis
patent: 3007164 (1961-10-01), Davis
patent: 3210766 (1965-10-01), Parker
patent: 3728732 (1973-04-01), Igarashi
patent: 3771159 (1973-11-01), Kawaguchi

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