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A W-band overmoded-waveguide oscillator with Gunn diodes

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3 Author(s)
Jongsuck Bae ; Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan ; Fujita, M. ; Koji Mizuno

Spatial power combining of Gunn diodes having an efficiency of greater than 80% has been demonstrated at W-band using an overmoded-waveguide resonator having an array of fundamental mode (TE 10) waveguides. Nine Gunn diodes contained in the 3×3 TE10-waveguide array have oscillated in a single TE30 mode in the overmoded-waveguide resonator, and have produced 0.45-W output power (continuous wave) with a combining efficiency of 55% at 98.8 GHz. This efficiency has been improved to 84% using a small and compact resonator that reduces the number of undesirable modes in the overmoded waveguide. The output mode of TE30 in the oscillator has been converted to TE10 using a mitered-waveguide junction mode converter

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:49 ,  Issue: 12 )