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Two Gunn-effect diodes were placed in a waveguide resonant circuit operating in a "push-pull" mode. The circuit was designed for 42 GHz, and power as high as 260 mW with 4.0-percent efficiency was obtained. Spurious modes and other circuit problems were investigated and some techniques were developed to cope with these problems.
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T.G. Ruttan (1972) studied this question.
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