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Encyclopedia > Cavity resonator

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. A resonator is device or part that vibrates with and amplify waves. ... The Tacoma Narrows Bridge (shown twisting) in Washington collapsed spectacularly, under moderate wind, in part because of resonance. ...


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. Electromagnetism is the physics of the electromagnetic field: a field, encompassing all of space, composed of the electric field and the magnetic field. ... A standing wave, also known as a stationary wave, is a wave that remains in a constant position. ...


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 calculation of the exact magnetic field has mathematical complexities and involves the study of Bessel functions. The Flute is a musical instrument of the woodwind family. ... A violin The violin is a bowed stringed musical instrument that has four strings tuned a perfect fifth apart. ... A brass, spherical Helmholtz resonator based on his original design, from around 1890-1900. ... In mathematics, Bessel functions, first defined by the mathematician Daniel Bernoulli and named after Friedrich Bessel, are canonical solutions y(x) of Bessels differential equation: for an arbitrary real number α (the order). ...


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. Reflex klystron Type 2K25 or 723 A/B. The threaded adjustment rod on the right side allows the position of the reflector to be adjusted (by compressing the reflex cavity), and thus the natural resonant frequency of the device. ... A cavity magnetron is a high-powered vacuum tube that generates coherent microwaves. ... Look up waveguide in Wiktionary, the free dictionary. ... A 1960s single stage 2MeV linear Van de Graaff accelerator, here opened for maintenance A particle accelerator is a device that uses electric and/or magnetic fields to propel electrically charged particles to high speeds. ... Beamlines at synchrotrons are facilities at which researchers get access to synchrotron light, the tunable and high-energy X-ray beams used in synchrotron research. ...


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. Lasers range in size from microscopic diode lasers (top) with numerous applications, to football field sized neodymium glass lasers (bottom) used for inertial confinement fusion, nuclear weapons research and other high energy density physics experiments. ... A cavity resonator uses resonance to amplify a wave. ... Electromagnetic radiation or EM radiation is a combination (cross product) of oscillating electric and magnetic fields perpendicular to each other, moving through space as a wave, effectively transporting energy and momentum. ... Prism splitting light Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific context, electromagnetic radiation of any wavelength. ...


Patents

The USPTO classifies devices and systems where the resonator device is an enclosure or cavity so constructed that the field configuration 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. The United States Patent and Trademark Office (PTO or USPTO) is an agency in the United States Department of Commerce that provides patent and trademark protection to inventors and businesses for their inventions and corporate and product identification. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... The word cavity in English means a hollow or a hole. ... Look up field in Wiktionary, the free dictionary A green field or paddock Field may refer to: A field is an open land area, used for growing agricultural crops. ... The term, longitudinal means front-to-back or top-to-bottom as opposed to transverse which means side-to-side. In automotive engineering, the term, longitudinal refers to an engine in which the crankshaft is oriented along the long axis of the vehicle, front to back. ... The term transverse means side-to-side, as opposed to longitudinal, which means front-to-back. In automotive engineering, the term transverse refers to an engine in which the crankshaft is oriented side-to-side relative to the wheels of the vehicle. ... A transmission line is the material medium or structure that forms all or part of a path from one place to another for directing the transmission of energy, such as electromagnetic waves or acoustic waves, as well as electric power transmission. ...

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


  Results from FactBites:
 
Waveguide series resonant cavity for enhancing efficiency and bandwidth in a klystron - Patent 6259207 (5094 words)
The resonant cavity is inductively coupled to the output waveguide through an iris that sets the phase of the reflection by virtue of its location in relation to the klystron output gap and the magnitude of the reflection by virtue of its size.
Attached to the resonant cavity 20 are adjustable tuners for tuning the resonant frequency of the resonant cavity 20.
By increasing the size of the coupling iris 22, the Q of the resonant cavity 20 is lowered, causing the frequency response curve of the resonant cavity to be broadened.
Ultrafast laser with multiply-folded resonant cavity - Patent 6055261 (3934 words)
The invention relates in particular to a laser having a resonant cavity containing at least one pair of fold-mirrors having a peak-reflectivity greater than 99.97 percent and arranged to cause multiple reflections therebetween of laser-light circulating in the resonant cavity.
In a simple arrangement of a laser cavity and dielectric material therein, such as, a gain medium and a mode locking device, total cavity GVD would be positive, i.e., shorter wavelength light experiences a higher refractive index and lower group velocity and lags behind longer wavelength light.
A folded resonator cavity 12 is terminated at opposite ends thereof by end-mirrors 14 and 16.
  More results at FactBites »

 
 

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