Cavity resonator

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A cavity resonator is a resonator composed of a space that is usually surrounded by a dielectric that uses resonance to select a specific band of frequencies.

1 Explanation
2 Examples
3 See also
4 Patents

[edit] Explanation

The cavity has interior surfaces which reflect a wave, usually electromagnetic, 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.

[edit] Examples

Some common examples of cavity resonators include the tube of a flute, and the body of a violin (this latter also being an example of a Helmholtz resonator).

The klystron tube in a microwave oven (see also magnetron). Other examples of cavity resonators include the klystron tube waveguide is beam tube including at least two apertured cavity resonators. The beam of charged particles passing through the apertures of the resonators in succession. A collector electrode being provided to intercept the beam after passing through the resonators. The first resonator causes bunching of the particles passing therethrough, the bunched particles then travel in a field-free region where further bunching occurs and then the bunched particles enter the second resonator giving up their energy to excite it into oscillations. It is 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.

The reflex klystron is a klystron utilizing only a single apertured cavity resonator through which the beam of charged particles passes in one direction. A repeller electrode being provided to repel (or redirect) the beam after passage through the resonator back through the resonator in the other direction and in proper phase to reinforce the oscillations set up in the resonator.

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.

[edit] See also

Waveguide

[edit] Patents

The USPTO classifies devices and systems where the resonator device is an enclosure or cavity so constructed that the fieldconfiguration excited within the boundaries of the device includes longitudinal as well as transverse field components as Class 333, Wave transmission lines and networks, and Subclass 227.

Numbered

U.S. Patent 2199045 -- Electromagnetic resonator -- W. Dallenbach
U.S. Patent 2611094 -- Inductance-capacitance resonance circuit -- H. B. Rex
U.S. Patent 2444152 -- Cavity resonator circuit -- P. S. Carter
U.S. Patent 2372228 -- Ultra short wave radio system -- S. A. Schelkunoff
U.S. Patent 2357314 -- Cavity resonator circuit -- P. S. Carter
U.S. Patent 2357313 -- High frequency resonator and circuit therefor -- P. S. Carter
U.S. Patent 2315313 -- Cavity resonator -- H. Bushholz
U.S. Patent 2235506 -- High frequency tanks and resonant cavities -- S. A. Schelkunoff
U.S. Patent 2262020 -- Frequency stabilization at ultra high frequencies -- F. B. Llewellyn
U.S. Patent 2250096 -- Resonant system for ultra short waves -- Willi Engbert
U.S. Patent 2199045 -- Electromagnetic resonator -- W. Dallenbach
U.S. Patent 2106769 -- Transmission of guided waves -- G. C. Southworth
U.S. Patent 2044413 -- Transmitter and receiver for electromagnertic waves -- R. Weyrich
U.S. Patent 2030180 -- Electrical circuit arrangement -- R. K. Potter
U.S. Patent 2030179 -- Electrical circuit arrangement -- R. K. Potter
U.S. Patent 2030178 -- Electrical circuit arrangement -- R. K. Potter

Reissued

U.S. Patent RE23534 -- High-power high-frequency electron discharge apparatus -- R. H. Varian
U.S. Patent RE23019 -- High efficiency resonate circuit -- W. W. Hansen
U.S. Patent RE22990 -- Modulation system -- W. W. Hansen