W-band microstrip oscillator using Gunn diode

Claim 1

A microstrip oscillator for providing high frequency power to a load comprising, in combination: (a) a packaged Gunn diode having first and second terminals and exhibiting a negative resistance characteristic over a predetermined frequency range; (b) a planar dielectric substrate having a metallic ground plane on one major surface thereof and a pattern of conductive strips on the other major surface thereof, said conductive strips defining (i) a quarter-wave shunt microstrip resonator, (ii) a microstrip quarter-wave transformer, (iii) a microstrip coupled line transformer, (iv) a d.c. bias network, and (v) an output microstrip line; (c) means for mounting said Gunn diode in generally co-planar relationship on said dielectric substrate; and (d) means for coupling said first terminal of said Gunn diode to said shunt resonator and to said d.c. bias network and said second terminal of said Gunn diode to said ground plane, said quarter-waver transformer and said coupled line transformer being disposed between said first terminal of said Gunn diode and said output line for isolating the d.c. bias voltage applied to said bias network from the high frequency signals on said output line while matching the impedance of said Gunn diode to said load connected to said output line.