Electrically controllable impedance matching device for use in R

Details Electrically controllable impedance matching device for use in R Electrically controllable impedance matching device for use in R

1998-05-19

2000-02-01

Gensler, Paul

Wave transmission lines and networks

Coupling networks

With impedance matching

333109, 333164, H01P 500

Patent

active

060207957

ABSTRACT:
An electrically controllable impedance matching device for matching an impedance of a signal output from a signal generator in an RF (Radio Frequency) amplifier. The impedance matching device includes a 3-dB directional coupler having a coupling terminal, a through terminal, an isolation terminal being an output terminal, and an input terminal connected to the signal generator; a first phase shifter connected to the coupling terminal, for shifting a phase of the signal according to a control signal; a second phase shifter connected to the through terminal, for shifting the phase of the signal according to the control signal; and controller for generating the control signal. Each of the phase shifters includes a 3-dB directional coupler having a coupling terminal, a through terminal, an isolation terminal being an output terminal, and an input terminal; a first varactor diode connected between the coupling terminal and a ground terminal, of which capacitance is variable according to the control signal; and a second varactor diode connected between the through terminal and a ground terminal, of which capacitance is variable according to the control signal.

REFERENCES:
patent: 3423699 (1969-01-01), Hines
patent: 3500259 (1970-03-01), Seidel
patent: 3768045 (1973-10-01), Chung
patent: 4493112 (1985-01-01), Bruene
patent: 4638269 (1987-01-01), Dawson et al.
patent: 4859972 (1989-08-01), Franke et al.

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