H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/115, 331/71,
H04B 1/16 (2006.01) H03D 9/06 (2006.01) H03B 5/18 (2006.01)
Patent
CA 1214522
ABSTRACT OF THE DISCLOSURE A microwave oscillator and a combination microwave oscillator/single balanced mixer for a satellite television receiver includes a cylindrical dielectric resonator located on one side of a ground plane formed by a conductive foil on a substrate with microstrip transmission lines formed by foil patterns on the opposite side of said substrate. gallium arsenide FET is disposed in a hole through said substrate with its source electrode connected to the ground plane and its drain and gate electrodes coupled to first and second transmission line strips portions of which are following the contours of said dielectric resonator. Two sets of coupling slots are formed in the ground plane for permitting magnetic coupling between the dielectric resonator and the opposite transmission line strips. In one embodiment an additional coupling slot in the ground plane couples the dielectric resonator to an output transmission line strip. In another embodiment a dual diode package is disposed in a square hole in the substrate and ground plane with the common junction of the two diodes being coupled to a third transmission line strip and the opposite ends of the series connected diodes coupled to the ground plane. Coupled magnetic energy from the resonator creates a potential difference across the ground plane at the opposite sides of the square hole thus generating a local oscillator signal across the series connected diodes. The third transmission line strip serves as a coupling for both an RF signal input to and an IF signal output from, the mixer.
459786
Macrae & Co.
Zenith Electronics Corporation
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