Characterization of electric field distribution in a GTEM cell

Two of the most important measurements related to electromagnetic compatibility (EMC) are radiated emission and radiated immunity. These measurements must be performed in a facility which provides reliability and reproducibility. The Gigahertz Transverse Electromagnetic Mode (GTEM) cell is one...

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Main Author:	Ubin, Aizan
Format:	Thesis
Language:	English English English
Published:	2004
Subjects:	TK Electrical engineering Electronics Nuclear engineering TK7800-8360 Electronics
Online Access:	http://eprints.uthm.edu.my/7606/1/24p%20AIZAN%20UBIN.pdf http://eprints.uthm.edu.my/7606/2/AIZAN%20UBIN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7606/3/AIZAN%20UBIN%20WATERMARK.pdf
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spelling	my-uthm-ep.76062022-08-29T07:37:18Z Characterization of electric field distribution in a GTEM cell 2004-04 Ubin, Aizan TK Electrical engineering. Electronics Nuclear engineering TK7800-8360 Electronics Two of the most important measurements related to electromagnetic compatibility (EMC) are radiated emission and radiated immunity. These measurements must be performed in a facility which provides reliability and reproducibility. The Gigahertz Transverse Electromagnetic Mode (GTEM) cell is one of the facilities for EMC measurement due to its well defined electric and magnetic field distribution in addition to being cost effective. The research undertaken in this project is to determine the field distribution in the GTEM by using Finite Difference Time Domain (FDTD). The results from the modeling are then compared with actual measurements and any differences will be noted and explained. The field strength inside a GTEM cell is a fl.lI1ction of the input power as well as location along the longitudinal axis or septum height. Radiated immunity measurements require field uniformity (+6 dB according to IEC 61000-4-3 standard) which depends on the design aspects of the GTEM such as size, material and absorbing condition. The capability of the GTEM cell to provide the unifo1111 field can be tested theoretically and experimentally. FDTD is a numerical method that can be used to predict the electric field distribution in a GTEM cell. The electric field distribution for frequencies at 100 MHz, 200 MHz, and 400 MHz were calculated using the EZ-FDTD software. In this report, theoretical study on the field strength and distribution in a GTEM cell is described. It is followed by making measurements of the field based on the radiated immunity test setup. It is found that at septum height 63 cm for frequency 100 MHz, the measured and simulated results are very close. This is the location recommended by the manufacturer for the placement of equipment under test (EUT) in radiated emission and radiated immunity test. The difference varies from 0.01 dB to 4.91 dB. The difference between modeling and actual measurement can be attributed to the input field distribution, inhomogeneous characteristics of the septum and existence of standing wave. In the future, it is recommended that other numerical methods such as Finite Element Method (FEM) and Transmission Lines Method (TLM) be used and more accurate model and absorbing boundary condition parameters be implemented. 2004-04 Thesis http://eprints.uthm.edu.my/7606/ http://eprints.uthm.edu.my/7606/1/24p%20AIZAN%20UBIN.pdf text en public http://eprints.uthm.edu.my/7606/2/AIZAN%20UBIN%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/7606/3/AIZAN%20UBIN%20WATERMARK.pdf text en validuser mphil masters Kolej Universiti Teknologi Tun Hussein Onn Fakulti Kejuruteraan
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TK Electrical engineering Electronics Nuclear engineering TK7800-8360 Electronics
spellingShingle	TK Electrical engineering Electronics Nuclear engineering TK7800-8360 Electronics Ubin, Aizan Characterization of electric field distribution in a GTEM cell
description	Two of the most important measurements related to electromagnetic compatibility (EMC) are radiated emission and radiated immunity. These measurements must be performed in a facility which provides reliability and reproducibility. The Gigahertz Transverse Electromagnetic Mode (GTEM) cell is one of the facilities for EMC measurement due to its well defined electric and magnetic field distribution in addition to being cost effective. The research undertaken in this project is to determine the field distribution in the GTEM by using Finite Difference Time Domain (FDTD). The results from the modeling are then compared with actual measurements and any differences will be noted and explained. The field strength inside a GTEM cell is a fl.lI1ction of the input power as well as location along the longitudinal axis or septum height. Radiated immunity measurements require field uniformity (+6 dB according to IEC 61000-4-3 standard) which depends on the design aspects of the GTEM such as size, material and absorbing condition. The capability of the GTEM cell to provide the unifo1111 field can be tested theoretically and experimentally. FDTD is a numerical method that can be used to predict the electric field distribution in a GTEM cell. The electric field distribution for frequencies at 100 MHz, 200 MHz, and 400 MHz were calculated using the EZ-FDTD software. In this report, theoretical study on the field strength and distribution in a GTEM cell is described. It is followed by making measurements of the field based on the radiated immunity test setup. It is found that at septum height 63 cm for frequency 100 MHz, the measured and simulated results are very close. This is the location recommended by the manufacturer for the placement of equipment under test (EUT) in radiated emission and radiated immunity test. The difference varies from 0.01 dB to 4.91 dB. The difference between modeling and actual measurement can be attributed to the input field distribution, inhomogeneous characteristics of the septum and existence of standing wave. In the future, it is recommended that other numerical methods such as Finite Element Method (FEM) and Transmission Lines Method (TLM) be used and more accurate model and absorbing boundary condition parameters be implemented.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Ubin, Aizan
author_facet	Ubin, Aizan
author_sort	Ubin, Aizan
title	Characterization of electric field distribution in a GTEM cell
title_short	Characterization of electric field distribution in a GTEM cell
title_full	Characterization of electric field distribution in a GTEM cell
title_fullStr	Characterization of electric field distribution in a GTEM cell
title_full_unstemmed	Characterization of electric field distribution in a GTEM cell
title_sort	characterization of electric field distribution in a gtem cell
granting_institution	Kolej Universiti Teknologi Tun Hussein Onn
granting_department	Fakulti Kejuruteraan
publishDate	2004
url	http://eprints.uthm.edu.my/7606/1/24p%20AIZAN%20UBIN.pdf http://eprints.uthm.edu.my/7606/2/AIZAN%20UBIN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7606/3/AIZAN%20UBIN%20WATERMARK.pdf
_version_	1747831169025572864

Characterization of electric field distribution in a GTEM cell

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