Microwave Communication
The Gunn diode oscillator

Generates frequencies which are below 100 MHz
Operates over a positive resistance characteristic
Depends on the formation of charge domain
Is capable of generating continuous microwave power of the order of kilowatt

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Microwave Communication
The cavity resonator

In a reflect klystron has its output taken from the reflector plate
Produces a frequency which is independent of the cavity size.
Has a low Q factor for narrow operation.
Is equivalent to an LC resonant circuit

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