Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin
Patent
1982-03-22
1984-05-29
Lieberman, Eli
Communications: radio wave antennas
Antennas
With coupling network or impedance in the leadin
455103, 455129, H01Q 500
Patent
active
044518323
ABSTRACT:
An efficient circuit for coupling at least two radio frequency transmitters of arbitrary power and frequency to one antenna comprises a three-port ferrite circulator connected to the output of each transmitter, a tee connector with a predetermined impedance mismatch connected to the first output port of each circulator, a first in-phase power combiner connected to the second output port of each circulator, and a second in-phase power combiner connected to the outputs of the tee connector and first combiner for adding the RF power and feeding the attached antenna. The impedances of transmission lines connected to the tee connector are selected to present a 3 to 1 voltage standing wave ratio to input lines so that reflected power is equally divided and fed in segments of equal power, phase and amplitude to that of the original summation for recombining and delivery to the antenna. The circuit effectively isolates the transmitters 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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