Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-04-01
1978-03-21
Griffin, Robert L.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325 24, 333 73W, 333 83R, H03H 710, H03H 1300, H01P 706, H04B 140
Patent
active
040806014
ABSTRACT:
In a filter network a common coupling element provides input of radio frequency energy to both an odd quarter wavelength resonant cavity and a variable reactance isolating the coupling element from ground. The resonant cavity presents an open circuit to a selected pass frequency and the variable reactance shunts energy to ground at a selected reject frequency. In a duplexer for radio transmitter and receiver, a filter network attaches to the transmission line between transmitter and antenna junction; the cavity is tuned to the transmitter carrier; the variable reactance is tuned to the receiver frequency. A similar filter network attaches to the transmission line between receiver and the same antenna junction; the resonant cavity is tuned to receiver frequency and the variable reactance is tuned to the transmitter carrier. The networks are spaced one quarter wavelength from the antenna junction.
REFERENCES:
patent: 3537041 (1970-10-01), Kommrusch
patent: 3815137 (1974-06-01), Kaegebein
patent: 3876963 (1975-04-01), Graham
Bookbinder Marc E.
Griffin Robert L.
Wacom Products, Incorporated
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