Title :
A W-band overmoded-waveguide oscillator with Gunn diodes
Author :
Bae, Jongsuck ; Fujita, Masayuki ; Mizuno, Koji
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
fDate :
12/1/2001 12:00:00 AM
Abstract :
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
Keywords :
Gunn diodes; millimetre wave oscillators; power combiners; resonators; waveguide junctions; 0.45 W; 55 percent; 84 percent; 98.8 GHz; Gunn diode; TE10-waveguide array; W-band; mitered-waveguide junction mode converter; overmoded-waveguide oscillator; overmoded-waveguide resonator; spatial power combining; Diodes; Frequency; Gunn devices; Impedance; Millimeter wave communication; Millimeter wave technology; Oscillators; Power combiners; Power generation; Solid state circuits;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
