- An enclosure which is able to maintain an oscillating electromagnetic field when suitably excited. The geometry of the cavity determines the resonant frequency, which is in the microwave range. Used, for instance, in klystrons, or magnetrons, or as a filter. Also known by various other names, including microwave resonance cavity, cavity (2), cavity resonator, resonant chamber, resonating cavity, waveguide resonator, and rhumbatron.
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