Results 261 to 270 of about 13,244 (302)

Time reversal and reverberation chambers

2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity (EMC, SI & PI), 2018
Presents a collection of slides covering the following topics: diffusive media; time reversal in diffusive media, and; wavefront synthesis.
Cozza, Andréa, Monsef, Florian
openaire   +3 more sources

Rationale for reverberation chamber testing

2013 US National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM), 2013
Summary form only given. Several test facility options for conducting electromagnetic compatibility testing including immunity, emissions, and shielding effectiveness are available. Generally each facility provides a different test electromagnetic environment. A reverberation chamber is a cavity enclosed by conducting surfaces with a method of exciting
Vignesh Rajamani, Charles F. Bunting, Gustav J. Freyer   +2 more
openaire   +1 more source

Qualification of WEAL Reverberation Chamber

The Journal of the Acoustical Society of America, 2001
Western Electro-Acoustic Laboratory (WEAL) has recently qualified a new reverberation chamber. Qualification measurements were performed for absorption testing (ASTM C423) and sound power testing (ANSI S12.31 and S12.32). Results are shown at various stages of the qualification.
openaire   +1 more source

Design of Chaotic Reverberation Chambers

2019 URSI International Symposium on Electromagnetic Theory (EMTS), 2019
Deforming the geometry of a rectangular reverberation chamber (RC) improves the field disorder and the chaoticity of the RC field, even in presence of traditional stirring mechanisms. We study how position and number of hemispherical wall diffractors affect the transmission-based modal overlapping of a real life RC facility.
L. Bastianelli, F. Moglie, V. Mariani Primiani, G. Gradoni   +3 more
openaire   +1 more source

Load Optimization in Reverberation Chambers

2021 15th European Conference on Antennas and Propagation (EuCAP), 2021
Optimal loading conditions of a reverberation chamber were investigated. The relevant figure of merit is discussed and defined. Multiple loading configurations were tested and results are reported. A simple model of how loading affects measurement uncertainty was developed and used to find a loading configuration that vastly improve results with ...
openaire   +1 more source

Boundary Fields in Reverberation Chambers

IEEE Transactions on Electromagnetic Compatibility, 2005
A previous plane-wave integral representation for fields in a reverberation chamber is extended to analyze fields near the boundaries of a rectangular chamber. The field point can be located near a single wall, a right-angle bend, or a right-angle corner. Multiple image theory is used to ensure exact boundary conditions.
openaire   +1 more source

Reciprocity in reverberation chamber measurements

IEEE Transactions on Electromagnetic Compatibility, 2003
Even though reverberation chambers have been used primarily for radiated immunity testing, they are reciprocal devices that are equally applicable for radiated emissions testing. This short paper presents the theory for radiated emissions testing and uses electromagnetic reciprocity theory to demonstrate the link between radiated emissions and immunity
openaire   +1 more source

Reverberation chambers at low frequencies

1999 IEEE International Symposium on Electromagnetic Compatability. Symposium Record (Cat. No.99CH36261), 2003
This report documents the effects of corrugated walls on the uniformity of the electromagnetic environment within a small (1.8 m/spl times/1.2 m/spl times/0.8 m) reverberation chamber. The frequency band evaluated was 150 MHz to 650 MHz, taking 5 MHz steps. At each frequency 100 tuner steps were made, resulting in one complete tuner rotation.
openaire   +1 more source

Characterization of a Reverberation Chamber

2015
Abstract : There is an increasing interest in the use of reverberation chambers with mode mixing for testing of electromagnetic susceptibility and immunity of a device under test because of its repeatability and measurement speed. A reverberation chamber is characterized as an environment with uniform, randomly polarized, isotropic fields throughout ...
openaire   +1 more source

Measurements in the Reverberation Chamber

The Journal of the Acoustical Society of America, 1939
Our idea of the sound absorption coefficient of a surface is carried over from the optical analogy of the reflectivity of a surface for light. All reverberation theory and methods of measurement of absorption coefficients now extant are based on this conception of the dissipation of sound energy within a closed space.
openaire   +1 more source