Abstract
AbstractThis article presents a compact, high‐efficiency, spatially power‐combining system based on WR‐140 waveguide power dividers/combiners and microstrip probe transitions. Using four GaAs MMIC driver amplifiers and four MFET power amplifiers, the combining circuit produced up to 45‐W maximum power output with a gain variation of ±1 dB within the band of 13.8–14.8 GHz. The passive combining efficiency within the operating band was measured over 87%, and PAE was up to 22%. An effective design and tuning method was adopted, and so a high combining efficiency was achieved. The results suggest the efficacy of the design and a strong potential for higher powers by connecting waveguide power dividers/combiners to these combining modules. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1471–1476, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23404
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