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MICROWAVE TRANSMISSION LINES, AND COMPONENTS OF MICROWAVE COMMUNICATIONS EQUIPMENT-NAMELY, SWITCHES, JOINT MOUNTS, DUMMY LOADS, ATTENUATORS, FILTERS, AMPLIFIERS, CIRCULATORS, ISOLATORS, TRANSMITTERS, CAVITIES, MODULATORS, RECEIVERS, DIVIDERS AND PHASE SPLITTERS, COMBINERS, MIXERS, ANTENNAS, RADIO FREQUENCY METERS, COUPLERS AND SAMPLERS; ANALOGUE AND DIGITAL CONTROLS, SENSORS, AND ANALOGUE AND DIGITAL LOGIC CIRCUITRY, FOR SWITCHING AND COMBINING MATRICES USED IN HIGH POWER RADIO FREQUENCY TRANSMISSION SYSTEMS