Cavity resonator
A cavity resonator uses resonance to amplify an electromagnetic wave. The cavity has interior surfaces which reflects an electromagnetic wave of a specific frequency. When a wave that is resonant with the cavity enters, it bounces back and forth within the cavity, with low loss (See standing wave). As more wave energy enters the cavity, it combines with and reinforces the standing wave, increasing its intensity.
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Examples
Some common examples of cavity resonators include the klystron tube. In a microwave oven (see also magnetron), the tube of a flute, and the body of a violin (this latter also being an example of a Helmholtz resonator). The calculation of the exact magnetic field has mathematical complexities and involves the study of Bessel functions.
Particle Accelerators and Particle Physics
Other examples of cavity resonators include the klystron tube Waveguide as in a particle accelerator that work in conjunction with a specifically tuned cavity by the configuration of the structures. On the beamline of an accelerator system, there are specific sections that are cavity resonators for RF.
Laser
In a laser, light is amplified in a cavity resonator which is usually composed of two or more mirrors. Thus an optical cavity, also known as a resonator, is a cavity with walls which reflect electromagnetic waves (light). This will allow standing wave modes to exist with little loss outside the cavity.
Patents
- U.S. Patent 2235506 -- High frequency tanks and resonant cavities -- S. A. Schelkunoff
- U.S. Patent 2315313 -- Cavity resonator -- H. Bushholz
- U.S. Patent 2357313 -- High frequency resonator and circuit therefor -- P. S. Carter
- U.S. Patent 2357314 -- Cavity resonator circuit -- P. S. Carter
- U.S. Patent 2372228 -- Ultra short wave radio system -- S. A. Schelkunoff
- U.S. Patent 2444152 -- Cavity resonator circuit -- P. S. Carter
- U.S. Patent 2611094 -- Inductance-capacitance resonance circuit -- H. B. Rex
