The Finite Ground Plane Effect on the Reconstruction of Equivalent Sources for Electromagnetic Compatibility Applications

2018 ◽  
Author(s):  
Huapeng Zhao ◽  
Chaofeng Li ◽  
Sihong Tao ◽  
Zhizhang Chen ◽  
Jun Hu
Keyword(s):  
Electromagnetic Compatibility ◽  
Ground Plane ◽  
Equivalent Sources

Antenna Calibration Methods for Antenna Factor Measurements

2012 ◽  
Vol 2 (4) ◽  
pp. 43-59 ◽  
Author(s):  
L. Mescia ◽  
O. Losito ◽  
V. Castrovilla ◽  
P. Bia ◽  
F. Prudenzano
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Ground Plane ◽  
Empty Space ◽  
Horn Antenna ◽  
International Standards ◽  
Impedance Method ◽  
Calibration Methods ◽  
Antenna Impedance ◽  
Antenna Factor

In the fields of electromagnetic interference and electromagnetic compatibility, it is important to measure the strength of the electric field originating from electric devices. For this purpose, knowledge of the antenna factor of a receiving antenna is necessary. According to international standards, the accurate measurement of the antenna factor involves the use of calibration test sites characterized by very large sizes of both the ground plane and the empty space volume above it. As a consequence, these setup conditions make the antenna factor measurements quite expensive for the customer. In this paper, the authors discuss the well know antenna-based and site-based methods as well as recently measurement method called Antenna Impedance Method as able to obtain the free-space antenna factor. Moreover, the authors investigate on the suitability of semi-anechoic chamber for reliable antenna factor calibrations. In particular, the experimental measurements of the antenna factor obtained by using the antenna impedance method were compared with Standard Field Method and the data provided by the manufacturer of three antennas (Biconical, Log-periodic and Horn antenna) founding an agreement with the international standard ANSI C63.5-2006.

Using Near Field Equivalent Sources in Combination with Large Element Physical Optics to Model a Slant 45 Degree Omni Directional Antenna over Ground

2021 ◽  
Vol 35 (11) ◽  
pp. 1362-1363
Author(s):  
Keith Snyder
Keyword(s):  
Near Field ◽  
Ground Plane ◽  
Directional Antenna ◽  
Physical Optics ◽  
Large Element ◽  
Far Fields ◽  
Equivalent Sources

This paper compares the theoretical and measured antenna patterns of a slant 45-degree antenna on a rolled edge ground plane. Advantages of using sampled nearfield currents in combination with large element physical optics in determining the reflected far fields will be described.

scholarly journals An Efficient Approach Based on the Near-Field Technique to Solve EMI Problems: Application to an AC/DC Flyback Converter

2020 ◽  
Author(s):  
Bessem Zitouna ◽  
Jaleleddine Ben Hadj Slama
Keyword(s):  
Magnetic Field ◽  
Power Electronics ◽  
Time Domain ◽  
Electromagnetic Compatibility ◽  
Near Field ◽  
Equivalent Model ◽  
Flyback Converter ◽  
Field Technique ◽  
Equivalent Sources ◽  
The Time Domain

Flyback converters have been widely used in low- and high-power applications because of their simplicity and low cost. However, they incur electromagnetic compatibility problems which are more difficult to control. The present chapter proposes an efficient modeling method based on the near-field technique to solve real-world radiation problems of the power electronics circuits. Firstly, for the characterization of an AC/DC flyback converter, several experimental measurements of the magnetic near field are performed in the time domain over the converter. Subsequently, we have applied the time domain electromagnetic inverse method based on the genetic algorithms on the measured signals to find the equivalent radiating sources of the studied circuit. The accuracy and the efficiency of the proposed approach have been demonstrated by the good agreement between cartographies of the near magnetic field components calculated using the developed model and those measured. Finally, the developed equivalent model has been used to predict cartographies of other components of the magnetic field which will be compared to measured cartographies. This confirms that the identified equivalent sources can represent real sources in the studied structure. The proposed method could be used for diagnosis and fault location in power electronics systems.

Issue on Calibration of Direct Feed Biconical Antenna in a Semi-Anechoic Chamber Using Standard Antenna Method

2014 ◽  
Vol 903 ◽  
pp. 273-278 ◽  
Author(s):  
Syarfa' Zahirah Sapuan ◽  
Mohd Zarar Mohd Jenu ◽  
Alireza Kazemipour
Keyword(s):  
Electromagnetic Compatibility ◽  
Ground Plane ◽  
Anechoic Chamber ◽  
Space Environment ◽  
Frequency Range ◽  
Biconical Antenna ◽  
Measurement Results ◽  
Antenna Type ◽  
Antenna Factor ◽  
Antenna Calibration

Antenna calibration is crucial to ensure the accuracy of Electromagnetic Compatibility (EMC) measurement results. Standard Antenna Method (SAM) is one of the methods widely used in antenna calibration which requires reference antenna with known Antenna Factor (AF) in a free space environment. The work presented in this paper is on the calibration of the AF of a direct-feed biconical antenna in a semi-anechoic chamber (SAC) with considerations given to the effects of ground plane, antenna height, reference antenna type and effects of phase center. The frequency range for the analysis is from 200 MHz to 2 GHz. It is found that antenna located 1.5 m from ground provides the best result compared to modeling. In addition, the phase centers of the reference and test antenna must be at the same positions during the measurements.

Radiated Electric Field from a Solar Cell Module Set on the Ground Plane

2010 ◽  
Vol 130 (8) ◽  
pp. 724-732
Author(s):  
Ryosuke Hasegawa ◽  
Mariko Tomisawa ◽  
Masamitsu Tokuda
Keyword(s):  
Solar Cell ◽  
Electric Field ◽  
Ground Plane ◽  
Cell Module ◽  
Solar Cell Module

Simplified Prediction of Ply Steer in Radial Tires

1980 ◽  
Vol 8 (1) ◽  
pp. 3-9 ◽  
Author(s):  
C. W. Bert
Keyword(s):  
Composite Laminate ◽  
Ground Plane ◽  
Lateral Force ◽  
Rolling Contact ◽  
Slip Angle ◽  
Uniform Stress ◽  
Rubber Composite ◽  
Laminate Theory ◽  
Contact Models ◽  
Uniform Stress State

Abstract Ply steer is a rolling contact phenomenon which manifests itself as a lateral force acting at the ground plane of a tire constrained in yaw or a change in slip angle of a tire free to yaw. It has long been known that radial tires generally exhibit greater ply steer than do bias tires. However, the only previously published quantitative analysis of this phenomenon considered the multi-layer cord-rubber composite by means of netting analysis, which is not very accurate at cord angles typical of radial tire belts. A simple, explicit expression is developed herein by combining modern composite laminate theory with two very simple, uniform-stress-state tire-road contact models. The ply-steer results predicted by the resulting expressions are compared with some experimental results and the agreement is found to be reasonably satisfactory.

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