Continuous phase shifter for a phased array hyperthermia system
摘要
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.
申请公布号
US4859972(A)
申请公布日期
1989.08.22
申请号
US19880265499
申请日期
1988.11.01
申请人
THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
发明人
FRANKE, STEVEN J.;BOESCH, RONALD D.;MAGIN, RICHARD L.