scholarly journals Optimization of the Measurement Technique for Emissions in Reverberation Chamber Using the Equivalence Principle

2021 ◽  
Vol 11 (16) ◽  
pp. 7696
Author(s):  
Alfredo De Leo ◽  
Graziano Cerri ◽  
Paola Russo ◽  
Valter Mariani Primiani
Keyword(s):  
Electric Field ◽  
Equivalence Principle ◽  
Current Version ◽  
Reverberation Chamber ◽  
Working Volume ◽  
Field Samples ◽  
Radiated Emissions ◽  
Equivalent Sources ◽  
Real Scenario ◽  
Space Conditions

This paper presents an optimization of a method to reconstruct the radiated emissions of an equipment under test by the measurement of the electric field samples collected on the walls of a reverberation chamber. This means that only the orthogonal component of the electric field is necessary to obtain the radiative behavior of the device in free space conditions. The use of the equivalence principle allows one to reduce the number of equivalent sources used to reconstruct the radiation of the device. In fact, in the previous version of the method, the sources are placed into the entirety of working volume of the reverberation chamber. In the current version of the method, only the surface surrounding the equipment under test is discretized. The analytical implementation of the method is proposed for a particular stirring action: the multiple monopole source stirring technique. This technique is based on an array of monopoles placed onto the walls of the cavity, and therefore no further hardware is needed for the reconstruction of the radiated emissions. The method is experimentally validated in a real scenario.

scholarly journals Development and Validation of New Reverberation Chamber for Wireless Devices

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Dong-Uk Sim ◽  
Sang Il Kwak ◽  
Jong Hwa Kwon ◽  
Seong-Ook Park
Keyword(s):  
Standard Deviation ◽  
Electromagnetic Compatibility ◽  
Initial Structure ◽  
Wireless Devices ◽  
Reverberation Chamber ◽  
Working Volume ◽  
Wireless Terminal ◽  
Reasonable Approach ◽  
Measurement And Evaluation ◽  
Development And Validation

This paper proposes a reverberation chamber structure consisting of new reflectors and mode stirrers for electromagnetic compatibility and wireless terminal measurements. The key design considerations for them are determined through a reasonable approach to analyze the eigenmode for a reverberation chamber and the standard deviation of its working volume based on 3D simulation. The final designs are expected to improve the standard deviation performance of the initial structure of the reverberation chamber and provide a better mode stirring environment. The results measured in the fabricated chamber demonstrate that these predictions are clearly realized. The results satisfy the main requirements of this paper, which are defined in consideration of the specifications of commercial reverberation chamber products. Therefore, the reverberation chamber of this paper is expected to be useful for performance measurement and evaluation of commercial wireless terminals. To verify this logical approach to obtain a good design and its results, the results measured in the actual fabricated reverberation chamber are described along with analytical and computational results.

Electric Field Uniformity Characteristic of a Reverberation Chamber with a Composite QRD

2013 ◽  
Vol 684 ◽  
pp. 518-521
Author(s):  
Eugene Rhee ◽  
Ji Hoon Lee
Keyword(s):  
Electric Field ◽  
Electromagnetic Compatibility ◽  
Quadratic Residue ◽  
Test Facility ◽  
Uniform Electric Field ◽  
Reverberation Chamber ◽  
Standard Requirement ◽  
International Standard ◽  
Field Uniformity ◽  
Simulation Results

This paper presents the electric field characteristics in a reverberation chamber which is an electromagnetic compatibility test facility that uses a stirrer to generate a uniform electric field inside it. In this paper, a diffuser is introduced from acoustics and newly designed to overcome problems of a stirrer. To validate the effect of a diffuser, a composite quadratic residue diffuser and a reverberation chamber are modeled. Then, the field uniformity inside the reverberation chamber is simulated by XFDTD 6.2 simulation program. Simulation results show that the electric field uniformity in the reverberation chamber satisfies the international standard requirement. This shows that the composite quadratic residue diffuser can be substituted for a stirrer.

scholarly journals Maximum Working Volume Evaluation in a Non-Canonical Reverberation Chamber

2009 ◽  
Vol 45 (3) ◽  
pp. 1646-1649 ◽  
Author(s):  
S.L. Avila ◽  
M.A. Santos ◽  
D. Weinzierl ◽  
L. Krahenbuhl ◽  
R. Perrussel ◽  
...  
Keyword(s):  
Reverberation Chamber ◽  
Working Volume

Shielding Effectiveness Simulation of SMT EMI Gaskets Utilizing ANSYS HFSS

2017 ◽  
Vol 2017 (1) ◽  
pp. 000109-000112
Author(s):  
Christopher M. Kerwien ◽  
Charlotte Blair
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Measurement Techniques ◽  
Electromagnetic Simulation ◽  
Shielding Effectiveness ◽  
Reverberation Chamber ◽  
Faraday Cage ◽  
Full Wave ◽  
Radiated Emissions ◽  
Ieee Standards

Abstract As more components populate smaller board areas, the risk of unwanted coupling between components increases. Shielding and radiated emissions tests outlined by IEEE standards such as IEC 61000-4-21 and ASTM4935D identify measurement techniques to quantify shielding effectiveness. In a PCB topology, shields enclose components to create a Faraday cage, but necessitate a method to ground and fasten the shield to the PCB. Typical methods include the use of gaskets, sealants and clips. This paper reviews a gasket methodology and validates a parameterized ANSYS HFSS simulation with the measured relationship between gasket configuration and shielding effectiveness. Surface mount, rectangular, compressible gaskets manufactured by W.L. Gore & Associates, Inc. are used in several configurations to shield a PCB radiator. Radiated emissions measurements are performed in an ETS-Lindgren reverberation chamber to evaluate shielding effectiveness for each configuration. ANSYS HFSS, a full wave Finite Element Method (FEM) electromagnetic simulation solver, is used to simulate each geometric configuration and is verified with measured results.

scholarly journals Analysis of emission tests of electromagnetic disturbances in diesel-electric locomotives

2019 ◽  
Vol 294 ◽  
pp. 02001
Author(s):  
Andrzej Białoń ◽  
Kamil Białek ◽  
Patryk Wetoszka
Keyword(s):  
Electric Field ◽  
Test Results ◽  
Electric Locomotive ◽  
Diesel Locomotive ◽  
Radiated Emissions ◽  
Measurement Results ◽  
Measurement Methodology ◽  
Electromagnetic Disturbances

This paper discussed the measurement of radiated emissions of electromagnetic disturbances generated by diesel electric locomotive system. The measurement methodology, permissible values of a magnetic and electric field according to EN 50121-3-1 standard during driving and standstill for electric diesel locomotive are presented. The article presents examples of test results and an assessment of the obtained measurement results in the electric and diesel traction according to the applicable requirements.

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