Image line Gunn diode combiner oscillators

Experimental procedures are outlined demonstrating that two Gunn diodes can be combined using a combination of two dielectric waveguide oscillators, a central cavity also consisting of a dielectric transmission line, and metal walled enclosures to suppress radiation and enhance tuning. Power output about four times that obtainable from a single diode is demonstrated. It is found that the two diodes need not be tuned individually; instead they will lock to the same frequency with minimal mechanical tuning. Combiner efficiencies of much more than 100% are seen as feasible.