Fabry-Perot Multiple-Device Oscillator Using an Axially Symmetric Mode

Minoru SANAGI  Shigeji NOGI  Kiyoshi FUKUI  Kazuyuki WATANABE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E78-C   No.8   pp.949-956
Publication Date: 1995/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
microwave,  power combining,  Fabry-Perot resonator,  axially symmetrical TEM01n mode,  device-field coupling,  

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Summary: 
We propose an axially symmetrical Fabry-Perot multiple-device oscillator operating at an axially symmetrical TEM01n-mode, which has an excellent feature of uniform device-field coupling required for high efficiency power combining. By carrying out the boundary element analysis, it is shown that a plane-mirror output structure is remarkably advantageous compared with a concave-mirror output structure to obtain an adequate output coupling and to enable stable operation characteristic with respect to the axial mode number n. Experiments in X-band confirmed this excellent performance and achieved almost perfect power combining of efficiency as high as 106% and 99% for six- and eight-device case, respectively.