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1. an instrument used to intensify sounds.
2. an electric circuit in which oscillations of a certain frequency are set up by oscillations of the same frequency in another circuit.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


A device for employing inductance to create an electric current of very high potential and small volume.
Farlex Partner Medical Dictionary © Farlex 2012

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As a result, resonant cavities in lasers can benefit from the construction of highly reflective Bragg super-mirrors, which can have reflectance values of 99.9999% [40-42].
Two resonant cavities with 2.7 GHz and 5.0 GHz resonant frequencies were used to measure the complex permittivity of polymer matrix composites, prepared by the dispersion of CCTO (Ca[Cu.sub.3][Ti.sub.4][O.sub.12]) powders, prepared by the solid-state method, in a polyvinyl alcohol (PVA) matrix.
Here, a four-order bandpass QFSIW filter is constructed by four cascaded QFSIW resonant cavities, which has the electrical coupling between adjacent cavities.
Because the shear and torsional energy can be trapped in the resonant cavities, putting multiple switch points into one substrate is possible.
First variant has the goal of improved efficiency and reduced the surface resistivity of resonant cavities, on which surfaces the roughness is modeling parallel with direction of skin current.
In summary, from Tables 1-4, resonant cavities are all simply connected (i.e., only one perfect electric conductor in the problem) and there are no any physical zero eigenvalues, thus confirming the advantage of the mixed finite element method, whereas there are many spurious nonphysical zero eigenvalues in the traditional edge element method.
Network analyzer measurements of return losses for a sealed enclosure, or blackbody resonator [60], from 200-400 MHz, confirm that Kirchhoff's law of thermal emission does not hold within arbitrary resonant cavities.
Based on studies done on resonant cavities for reverberation chamber tests for MIL-STD-461 testing by USN Dahlgren, VA, the average RF field strength inside an unloaded reflecting cavity can be calculated by:
The ability to have one single source rapidly switch between two resonant cavities is another benefit, allowing the asynchronous and simultaneous function of two separate ovens within one GC.
Resonant cavities are almost-closed structures, hence, only cavity modes can exist.
The third-order band-pass filter is a combination of three resonant cavities in parallel.
They cover the elementary methods, Bernoulli numbers, including the Riemann Zeta function and the Euler-MacLaurin sum formula, modular forms and Hecke's theory of modular forms, representations of numbers as sums of squares, including the singular series and Liouville's methods and elliptical modular forms, arithmetic progression, and applications such as computing sums of two to four squares, resonant cavities and diamond cutting.