Microwave oscillator circuit with Gunn or IMPATT diode - has diode in cavity resonator to produce continuous or pulsed millimetre waves

摘要

The microwave oscillator has a negative impedance device, e.g. a Gunn or IMPATT diode. The diode is located in a cavity resonator and produces continuous or pulsed millimeter waves of e.g. 35 GHz. The diode (4) is located in the centre of a normal section of waveguide acting as a cavity resonator. There is a filter resonator (2) which prevents power passing out via the DC supply line of the diode. An impedance transformer (3) is located on the opposite side to the diode earth connection to match the diode to the cavity resonator.