H - Electricity – 04 – B
Patent
H - Electricity
04
B
333/1
H04B 1/04 (2006.01) H01P 1/10 (2006.01) H01P 1/18 (2006.01) H01P 5/16 (2006.01) H04N 5/38 (2006.01)
Patent
CA 1258696
SIMPLIFIED PHASE-CONTROLLED TELEVISION BROADCAST SWITCHING CIRCUIT AND THREE-POSITION COAXIAL LC PHASE SHIFTER THEREFOR Abstract Of The Disclosure 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 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° coupler coupled to the sources and a second 3db, 90° coupler coupled to the load and the antenna. A third 3dB, 90° 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° for mode I, 90° for mode II and 180° for mode III. A fixed phase shifter couples the first and second 3dB, 90° 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.
525795
Clark Raymond N.
Schmitz Anthony N.
Borden Ladner Gervais Llp
General Signal Corporation
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