Abstract: High efficiency transmit-receive switches in accordance with embodiments of the invention are disclosed. In one embodiment, a high efficiency transmit receive switch includes a power input coupled to a power supply, an amplifier output port and a transmit switch input port coupled to a circulator, a received signal circuit port coupled to a first PIN diode coupled to a second PIN diode via a first transmission line and spaced a fractional wavelength apart, the transmit switch input port is coupled to a third PIN diode coupled to a harmonic filter, a second transmission line coupled between the second PIN diode and to the third PIN diode, spaced a fractional wavelength apart, the transmit circuit signal port is coupled to an amplifier, the amplifier is coupled to the amplifier output port, the second transmission line is coupled to the bias current generator coupled to the output port.

Abstract: An electromagnetic interference (EMI) shielding system includes one or more electrically conductive gaskets placed between electronic circuit cards in a card rack. The conductive gaskets are affixed to circuit cards to form a conductive shield, at the end of the card rack that is nearest the door of the cabinet in which the card racks are mounted. A gasket is attached to each circuit card within a rack, the gasket “filling” the space between the faceplates of two adjacent circuit cards.

Abstract: A method for linearizing amplifiers by measuring the intermodulation products at the output of the linearized amplifier using minimum additional hardware without the performance problems associated with pilot tones. In one embodiment, the amplifiers are adaptively linearized using performance monitoring radios. Specifically, the performance monitoring radios are used to measure the signal levels of the intermodulation products in unused communication channels. Such measurements are then used to adaptively linearize the amplifiers and reduce the levels of intermodulation products.