Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1974-08-02
1977-01-04
Griffin, Robert L.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325379, 325383, 343713, H04B 118
Patent
active
040016960
ABSTRACT:
An electronic antenna adapted for concealment in an automobile or similar vehicle is tuned by the RF tuning circuits of a conventional radio receiver. In the preferred embodiment, the antenna is designed for the AM and FM broadcast bands and includes a concealed metal plate which may be suitably mounted at a convenient location on the vehicle such as being embedded in the crash panel. RF signals are received by the metal plate pick-up which is connected to both low frequency and high frequency RF amplifiers which amplify them and, after suitable filtering, provide a highly selective output to the conventional radio receiver. This is due to the fact that when the conventional radio receiver is tuned to a station, it presents a very high impedance load at that frequency thereby causing the low frequency or high frequency RF amplifier of the electronic antenna to amplify that frequency in preference to all others.
REFERENCES:
patent: 3217265 (1965-11-01), Lungo
patent: 3541555 (1970-11-01), Willie et al.
patent: 3571716 (1971-03-01), Hill
patent: 3703685 (1972-11-01), Simopoulos
patent: 3801922 (1974-04-01), Muszkiewicz
Franklin C. Fitchen, "Transistor Circuit Analysis and Design" 1966, pp. 302-303.
Schilling and Belove, "Electronic Circuits; Discrete and Integrated" 1968, pp. 431-436.
Griffin Robert L.
Masinick Michael A.
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