Abstract: A oscillator bias injector system for use in maritime applications in connection with a VSAT communication system including a satellite modem connected to a commercially available high power block upconverter and low noise block downconverter which are both connected to an outdoor antenna mounted on a stabilized platform, which antenna sends and receives signals from a Ku-band satellite in geosynchronous orbit. The oscillator bias injector is installed between the block upconverter and the satellite modem such that the RF signal generated by satellite modem is combined with an internally generated stabilized 10 MHz reference signal from oscillator, which summed signal is then combined with DC bias generated by an AC rectifier to thereby provide a means of interfacing a custom designed modem to the block upconverter to improve the uplink speed of the VSAT system.

Abstract: A radial power combining scheme is provided for combining a plurality of field-effect transistor-based amplifiers to form an amplifier circuit. The amplifier circuit includes input terminals for receiving high frequency power signals. A radial line power combiner/divider is provided for dividing the input signal amongst a plurality of amplifiers. The radial line power combiner/divider is further adapted to receive and combine the amplified signals which are then provided to an output. The circuit advantageously utilizes a plurality of three-port circulators for transmitting the signals within the circuit.

Abstract: A digital phase shift apparatus having a pair of single gate FETs which are connected in a common source configuration. Transmission line segments which respectively connect the sources and drains of the FET pair, provides a phase shift to an applied RF signal. The operating FET provides signal gain as well as switch the signal path length.

Abstract: Two microstrip transmission line substrates are mounted face-to-face at a fixed separation determined by mating connector halves which provide microstrip to coaxial transmission line transitions. Each connector half includes a body portion, a stand-off portion and a coaxial connector portion.