Accession Number : AD0914704

Title :   Microwave Power Combinatorial Techniques.

Descriptive Note : Final technical rept. 4 Apr 72-4 Jul 73,

Corporate Author : UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CT

Personal Author(s) : Gilden, Meyer ; Kaul, Roger D.

Report Date : NOV 1973

Pagination or Media Count : 66

Abstract : The research and development on microwave power combinatorial techniques for active semiconductor devices covered in this report is significant to the Air Force because it delineates the problems and limitations of quasi-optical approaches for high power, microwave power sources. The general approach investigated under this program was primarily directed toward broadband operation and utilizing arrays of simple reflection amplifier elements and non-resonant power combiner structures. The combiners investigated under this program contained no networks of transmission lines or other additional circuit elements, hence; the approach was essentially quasi-optical. The work concentrated on a broadband reflection power amplifier comprised of a 5 by 5 array of elements and included some work, for further experimental support, on circular arrays of both 8 and 24 elements. The individual amplifier elements and combiners designed, fabricated, and tested under the program met the bandwidth objectives of the program; (i.e., 10% bandwidth of center frequency). However, the complete active power combiner could not be made to function as a useful amplifier because of spurious signals. These spurious signals were concluded to be caused by mutual interaction between the wide band amplifier elements. This interaction, resulted in undesirable input impedance variations with frequency. These input impedance variations with frequency together with the strong nonlinearities in the diodes results in the generation of many spurious signals by parametric interactions.

Descriptors :   *MICROWAVE EQUIPMENT), (*POWER AMPLIFIERS, MICROWAVES, RADIOFREQUENCY POWER, BROADBAND, SEMICONDUCTOR DIODES, ANTENNAS, RADAR EQUIPMENT, HIGH POWER.

Subject Categories : Electrical and Electronic Equipment
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE