Communications: radio wave antennas – Antennas – With vehicle
Patent
1978-03-27
1980-12-09
Lieberman, Eli
Communications: radio wave antennas
Antennas
With vehicle
343745, 343749, H01Q 132
Patent
active
042387990
ABSTRACT:
A half-wave length communications antenna assembly especially adapted to be mounted on non-conductive surfaces, such as on a window of a vehicle. The antenna assembly desirably includes an electrically shortened half-wave inductively loaded radiating whip loaded at its base end by a loading capacitor plate to be fixed to a non-conductive surface. The whip is coupled through the non-conductive surface to a transmission line internally of the vehicle by a coupling capacitor plate which, with the loading capacitor plate, forms a coupling capacitor. A tuned circuit which is tuned to the nominal resonant frequency of the whip is connected to the coupling capacitor plate and serves as an impedance matching circuit between the half-wave whip and the transmission line. The tuned circuit also affects the radiation pattern of the whip to produce a pattern more typical of a five-eighths wave length antenna to provide somewhat greater gain.
REFERENCES:
patent: 1715952 (1929-06-01), Rostron
patent: 2829367 (1958-04-01), Rychlik
patent: 2941204 (1960-06-01), Bailey
patent: 2963704 (1960-12-01), Yates et al.
patent: 3264647 (1966-08-01), Nuttle
patent: 3945014 (1976-03-01), Kunert et al.
patent: 4089817 (1978-05-01), Kirkendall
Avanti Research & Development, Inc.
Lieberman Eli
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