Kai Chieh Chang

46413693, Feb 3, 1987

Nov 29, 1984

6/676324

Albert J. Grote - Venice CA
Raghbir S. Tahim - Buena Park CA
Kai Chang - Rancho Palos Verdes CA

TRW Inc. - Redondo Beach CA

H04B 126

455327

A radio-frequency mixer and a local oscillator integrated into a single housing, and including a Gunn-type oscillator coupled to the mixer by a section of microstrip transmission line and a section of suspended stripline. A broadside coupler in the suspended stripline provides dc and intermediate-frequency isolation for the mixer, and a block of dielectric material on the microstrip provides improved temperature compensation for the diode oscillator. The entire compact assembly has good conversion loss performance over a relatively wide frequency band, and is relatively insensitive to temperature changes.

45217475, Jun 4, 1985

Oct 11, 1983

6/540471

Raghbir S. Tahim - Buena Park CA
George M. Hayashibara - Wilmington CA
Kai Chang - Rancho Palos Verdes CA

TRW Inc. - Redondo Beach CA

H03B 914

331107SL

Improved output power performance is obtained in a millimeter-wave integrated-circuit (MIC) voltage-controlled oscillator by forming an output circuit and a bias input circuit in a suspended stripline configuration, which is subject to relatively low losses compared with microstrip designs. A Gunn diode and a varactor diode are mounted in alignment and in close proximity to each other. The suspended microstrip configuration includes a suspended substrate with a Gunn diode output circuit and a bias input circuit on one side, and a varactor diode grounding pad on the other face of the substrate. A sliding short-circuit device aligned with the Gunn diode output circuit provides tuning of the oscillator over a relatively wide range, and avoids having to trim the Gunn diode circuit components for final adjustment of the frequency.