Microwave Communication
The Gunn diode oscillator

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

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Microwave Communication
The cavity resonator

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

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