Microwave Power Combinatorial Techniques.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1973
- Accession Number
- AD0914704
Entities
People
- Meyer Gilden
- Roger D. Kaul
Organizations
- United Technologies Corporation