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broadband frequency couplers, namely, directional couplers, hybrid couplers; electronic combiners for connecting antennas and receivers, namely, matched line directional dividers (MLDD) power dividers/combiners; broadband radio components, namely, doped barrier detectors, zero bias Schottky detectors, directional detectors, broadband threshold detectors, broadband planar tunnel diode detectors, broadband pin-Schottky limiters; power supply connectors and adaptors for use with portable electronic devices, namely, coaxial cable adapters, coaxial cable terminations; electric power meter; and electric power sensors