Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin
Patent
1982-03-22
1984-05-15
Lieberman, Eli
Communications: radio wave antennas
Antennas
With coupling network or impedance in the leadin
455103, 455129, H01Q 500
Patent
active
044491280
ABSTRACT:
An efficient circuit for coupling at least three radio frequency transmitters of arbitrary power and frequency to one antenna comprises a three-port circulator connected to the output of each transmitter, a four-port connector and a five-port inphase power combiner, and transmission lines having the same characteristic impedances connecting the circulators through the connector and the combiner to the antenna. The transmission lines interconnecting the components of the circuit have electrical lengths selected to deliver energy in phase to the ports of the connector and to the combiner. In a three-transmitter embodiment, one output port of each circulator is connected to the connector, a second output port of each circulator is connected to the combiner, and the output port of the connector is connected to the combiner. In a four-transmitter embodiment, one output port of each circulator is connected to the connector and the second output port of each circulator is connected to the combiner. In each embodiment, each input to the connector "sees" a 3 to 1 voltage standing wave ratio causing reflected energy to be equally divided and fed in segments of equal power and phase for recombining and feeding the single antenna. The circuit effectively isolates the tansmitters from each other and combines their outputs with high efficiency and minimum loss.
REFERENCES:
patent: 3099794 (1963-07-01), Essam et al.
patent: 3714661 (1973-01-01), Kershaw
patent: 3928806 (1975-12-01), Carter et al.
patent: 4206464 (1980-06-01), Hirsch
GTE Products Corporation
Lawler John F.
Lieberman Eli
Ohralik Karl
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