Importance

Loading Importance Indicators...

Abstract

A noncontact switch couples power from A and B radio frequency sources to a load and an antenna in three modes. Mode I couples the A source to the antenna and the B source to the load; Mode III is B to antenna and A to load, and Mode II couples both A and B sources to the antenna. The structure includes a first 3dB, 90.degree. coupler coupled to the sources and a second 3db, 90.degree. coupler coupled to the load and the antenna. A third 3dB, 90.degree. coupler is coupled in a first path between the first and second couplers. A pair of reflective terminations coupled to ports of the third coupler are mechanically controllable to one of three phase-shift conditions; 0.degree. for mode I, 90.degree. for mode II and 180.degree. for mode III. A fixed phase shifter couples the first and second 3dB, 90.degree. couplers by a second path. Each reflective phase shifter is a coaxial circuit including the parallel combination of first and second series inductance-capacitance circuits. A gap in the hollow center conductor is used to provide the capacitance. A conductive slug sliding in the hollow controls the capacitance.

Loading the Abstract Image...

First Claim