Accession Number : AD0776809

Title :   Nanosecond LSA Microwave Transmitter.

Descriptive Note : Final rept. 1 Sep 72 - 21 Nov 73,


Personal Author(s) : Camp,William O. , Jr

Report Date : FEB 1974

Pagination or Media Count : 41

Abstract : The Limited Space-charge Accumulation (LSA) mode in n-type GaAs has been considered as a source of high peak power at microwave frequencies. However, because the microwave oscillation is that of a relaxation oscillator, the frequency varies rapidly with bias voltage and temperature. This presents a problem when a high degree of frequency stability is required, and must be compensated for. Furthermore, the thicker LSA devices cause a larger thermal heating and must operate at low duty cycles. However, one can trade duty cycle for device thickness and accordingly peak and average power (20 Watts and 200 Milliwatts) is made. The methods of frequency stabilization are investigated and the one yielding the highest degree of frequency stability is investigated. A third area investigated is that of a high PRF pulser to yield the 1% duty cycle to be used. (Author)

Descriptors :   *Radio transmitters, *Microwave equipment, X band, Microwave oscillators, Gallium arsenides, Gunn effect

Subject Categories : Electrical and Electronic Equipment
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE