Metal structure which confines microwaves or radio waves for resonance
This article is about the type of resonator. For the particle acceleration technology, see Superconducting radio frequency and cryomodule.
Two microwave cavities (left) from 1955, each attached by waveguide to a reflex klystron (right) a vacuum tube used to generate microwaves. The cavities serve as resonators (tank circuits) to determine the frequency of the oscillators
A microwave cavity or radio frequency cavity (RF cavity) is a special type of resonator, consisting of a closed (or largely closed) metal structure that confines electromagnetic fields in the microwave or RF region of the spectrum. The structure is either hollow or filled with dielectric material. The microwaves bounce back and forth between the walls of the cavity. At the cavity's resonant frequencies they reinforce to form standing waves in the cavity. Therefore, the cavity functions similarly to an organ pipe or sound box in a musical instrument, oscillating preferentially at a series of frequencies, its resonant frequencies. Thus it can act as a bandpass filter, allowing microwaves of a particular frequency to pass while blocking microwaves at nearby frequencies.
A microwave cavity acts similarly to a resonant circuit with extremely low loss at its frequency of operation, resulting in quality factors (Q factors) up to the order of 106, for copper cavities, compared to 102 for circuits made with separate inductors and capacitors at the same frequency. For superconducting cavities, quality factors up to the order of 1010 are possible. They are used in place of resonant circuits at microwave frequencies, since at these frequencies discrete resonant circuits cannot be built because the values of inductance and capacitance needed are too low. They are used in oscillators and transmitters to create microwave signals, and as filters to separate a signal at a given frequency from other signals, in equipment such as radar equipment, microwave relay stations, satellite communications, and microwave ovens.
RF cavities can also manipulate charged particles passing through them by application of acceleration voltage and are thus used in particle accelerators and microwave vacuum tubes such as klystrons and magnetrons.
A microwavecavity or radio frequency cavity (RF cavity) is a special type of resonator, consisting of a closed (or largely closed) metal structure that...
of the cavity magnetron in the United Kingdom made possible the production of electromagnetic waves of a small enough wavelength (microwaves) to efficiently...
by microwave interference within an air-filled cylindrical cavity fed by a rectangular waveguide using a 2.45 GHz, 5 kW (maximum power) microwave oscillator...
The cavity magnetron is a high-power vacuum tube used in early radar systems and subsequently in microwave ovens and in linear particle accelerators. A...
frequency. A cavity resonator is one in which waves exist in a hollow space inside the device. In electronics and radio, microwavecavities consisting of...
Lung cavity, an air-filled space within the lung Nasal cavity, a large, air-filled space above and behind the nose in the middle of the face Microwave cavity...
the project's documentation) is an experiment that uses a resonant microwavecavity within a large superconducting magnet to search for cold dark matter...
their radar system microwave generation, while the Allies used the far more powerful but frequency-drifting technology of the cavity magnetron for much...
the lower state and emit some microwave radiation. A high Q factor (quality factor) microwavecavity confines the microwaves and reinjects them repeatedly...
arrangement is similar to an Einzel lens. An RF electron gun consists of a Microwavecavity, either single cell or multi-cell, and a cathode. In order to obtain...
called cavity quantum electrodynamics (CQED) – whereby the properties of an atom are controlled by placing it in an optical or microwavecavity. Haroche...
of the microwavecavity (sample chamber), k f {\displaystyle k_{f}} is the cavity filling coefficient, and P {\displaystyle P} is the microwave power in...
including microwave ovens, microwave communication systems, and remote imaging systems using electro magnetic waves. How a resonant cavity performs can...
storage bulb is inside a microwavecavity made from a precisely machined copper or silver-plated ceramic cylinder. This cavity is tuned to the 1.420 GHz...
emission of microwaves of the same frequency. These microwaves are then directed into a resonant cavity. Because they can transmit microwaves with lower...
on a hyperfine transition, the field in the cavity oscillates, and the cavity is tuned for maximum microwave amplitude. Alternatively, in a caesium or rubidium...
range, down to under 27.5 cm in the 900 MHz range. In the microwave range (1000 MHz and up), cavity filters become more practical in terms of size and a significantly...
frequency in the form of a waveguide, microwavecavity, or YIG sphere. The diode is usually mounted inside the cavity. The diode cancels the resonator's...
provided by cavity quantum electrodynamics. Circuit quantum electrodynamics, which uses superconducting qubits coupled to a microwavecavity on a chip,...
conventional microwave vacuum tubes such as klystrons and magnetrons, in which the wavelength is determined by a single-mode resonant cavity, a slow-wave...
conversion of axions to microwaves. ADMX searches the galactic dark matter halo for axions resonant with a cold microwavecavity. ADMX has excluded optimistic...
established the frequency for a variety of normal modes of microwaves of a microwavecavity of precisely known dimensions. The dimensions were established...
another high-power source, driving a transmitting antenna and exciting microwavecavity resonators. Among these applications, driving transmitter antennas...
Microwave engineering pertains to the study and design of microwave circuits, components, and systems. Fundamental principles are applied to analysis...
tuned over a wide range by using variable components in the filter. A microwavecavity can be tuned mechanically by moving one of the walls. In contrast,...
theory behind a microwave resonant cavity thruster. A demonstration version of the drive was built and tested with different cavity shapes and at higher...
vertically by laser light. The atoms then undergo Ramsey excitation in a microwavecavity. The fraction of excited atoms is then detected by laser beams. These...
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