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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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These two separated asymmetric transmission passbands have a function of selective polarization filter, which can be switched on/off by changing the polarization state of incident waves, and then the electric field in the Fabry-Perot-like resonant cavity and surface current distribution is applied to demonstrate physical mechanisms of the polarization conversion.
Therefore, the total electric field inside the resonant cavity excited by a uniform current density strip is given by the following expression:
In this paper, we present a high-gain low-profile resonant cavity antenna.
In a rectangular resonant cavity, the tensor [??]([r.sub.R]|[r.sub.T]; t) can be obtained by numerical simulations or theoretical derivation from image method.
The cavity model assumes the rectangular patch to be essentially a closed resonant cavity with magnetic walls and it can predict all properties of the antenna with high accuracy but at the expense of much more computation effort than the transmission line model.
TABLE I TYPICAL MATERIAL PROPERTIES Speedboard Speedboard Property Test Condition LF EF Dielectric constant Split post 2.6 2.7 (Dk) resonant cavity (1 MHz-40 GHz) Loss tangent (Df) Split post 0.004 0.006 resonant cavity (1 MHz-40 GHz) Peel strength 17 mm (1/2 oz) 1.1 (6.5) 1.1 (6.5) (Kg/cm (pli)) VLP foil Solder resistance 288[degrees]C; pass pass 6 x 30 sec CTE (X,Y,Z) TMA (-55[degrees] 56 56 (ppm/[degrees]C) to +200[degrees]C) Glass transition TMA 220 (428) 220 (428) temperature ([degrees]C ([degrees]F)) Thickness [micro]m 57, 86 57, 86 mil (2.2, 3.4) (2.2, 3.4) W.L.
Dk testing was done by an independent testing laboratory (Electronics Consulting Laboratory) and followed Test Method B: "Resonant Cavity Perturbation Technique" as defined in ASTM D2520-01, "Standard Test Methods for Complex Permittivity (Dielectric Constant) of Solid Electrical Insulating Materials at Microwave Frequencies and Temperatures to 1650 C."
A microwave plasma in argon is generated inside a pyrex tube by a 3-kW power supply in combination with a magnetron, wave guide, and a resonant cavity. The gas pressure is varied from 200 to 1800 mTorr, and the microwave output power from 300 to 1200 W.
Inside this resonant cavity is some type of amplifying medium - a gas, a liquid or even solid matter.
To study the dielectric response of the composites in the high-frequency region, we used the resonant cavity method.
In [11], the thickness of the module reaches 0.37 waveguide width and the change of thickness will change the resonant frequency as the twist is regarded as a resonant cavity. In our proposed module, two substrate layers are used instead.