Antenna tuner discriminator

Details Antenna tuner discriminator Antenna tuner discriminator

1981-11-19

1985-01-08

Lieberman, Eli

Telecommunications

Transmitter

Including tuning

455115, 455129, 333 17M, 343861, H04B 104, H03H 740

Patent

active

044931123

ABSTRACT:
A simple technique and circuit is disclosed to replace prior Z-.theta. type discriminators in supplying the loading and phasing control signals to the impedance matching network in an automatic antenna tuner. The new circuit samples forward and reflected voltage V.sub.f and V.sub.r (or equivalently I.sub.f and I.sub.r) in the RF input. The loading control signal is supplied according to the in-phase component of V.sub.r relative to V.sub.f. The phasing control signal is supplied according to the quadrature component of V.sub.r relative to V.sub.f. The magnitude of each of the in-phase and quadrature V.sub.r components is reduced to zero by the matching network to thus reduce the phasor amplitude of V.sub.r to zero and hence eliminate reflected voltage.

REFERENCES:
patent: 3443231 (1969-05-01), Roza
patent: 3715690 (1973-02-01), Young et al.
patent: 3919643 (1975-11-01), Templin
patent: 3995237 (1976-11-01), Brunner
patent: 4015223 (1977-03-01), Cheze
patent: 4028645 (1977-06-01), Tressa
patent: 4356458 (1982-10-01), Armitage
Bruene, "An Inside Picture of Directional Wattmeters", QST Apr., 1959, pp. 24-28.

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