Advanced Concepts of Microwave Generation and Control in Solids.

The report deals with the progress made during the second quarterly period of a solid state microwave oscillator and amplifier research and development program. Discussed first is the progress on Gunn effect research. Work on the following specific topics is reviewed: high efficiency studies of LSA oscillators; some harmonic properties of an LSA oscillator; LSA circuit studies; operation of multiple LSA diodes; a varactor tuned Gunn oscillator; and a Gunn effect amplifier. The progress made on a parallel program on avalanche diode devices is also described. The following specific topics are reviewed: performance characteristics of subharmonically locked IMPATT diode oscillators; IMPATT efficiency and average power improvement resulting from second harmonic tuning; harmonic properties of avalanche diode oscillators; integrated IMPATT and TRAPATT oscillators; high-frequency high-efficiency avalanche oscillations; avalache device calculations in the anomalous high-efficiency regime; higher average power TRAPATT oscillator studies; and measurements of IMPATT diode parameters at microwave frequencies. Finally, the progress made on the studies of solid state materials for microwave devices are reported. The topics include: ion implantation and diffusion; vacuum epitaxial growth in silicon; microwave avalanche oscillator fabrication from bulk material; and epitaxial growth and performance of gallium arsenide. (Author)