Double cavity tuning of Gunn oscillators at millimeter wavelengths

Experiments have been performed confirming the advantage of double cavity tuning of Gunn devices in the 35-GHz band. Output power improvements achieved were of 20-40 percent. The tunability of devices was over 5 GHz with output power above 5 mW. Maximum achievable frequency is with dual cavity about 7-8 percent lower than with the simple basic device.