Continuous phase shifter for a phased array hyperthermia system

Details Continuous phase shifter for a phased array hyperthermia system Continuous phase shifter for a phased array hyperthermia system

1988-11-01

1989-08-22

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

333161, H01P 1185

Patent

active

048599727

ABSTRACT:
A continuous microstrip phase shifter suitable for use in a phased array microwave hyperthermia system operating at 915 MHz is provided. The phase shifter utilizes a three dB quadrature hybrid coupler in conjunction with microstrip lines to change the phase of a transmitted wave. The phase change is introduced through the reflection ports of the coupler which are loaded with identical parallel resonant circuits. An abrupt junction varactor capacitance in parallel with a distributed inductance forms a voltage-tunable resonant circuit. The resonant element values are chosen to give a specified continuous phase variation with minimum transmission loss. This is accomplished without additional microwave circuit elements.

REFERENCES:
patent: 3768045 (1973-10-01), Chung

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