A method of reducing the number of ferrite tiles in an absorber lined chamber

J Clegg; M Alexander; Linda Dawson; J F Dawson; J Jee; A C Marvin; B Loader; S J Porter

doi:10.1049/cp:19990245

A method of reducing the number of ferrite tiles in an absorber lined chamber

J Clegg, M Alexander, Linda Dawson, J F Dawson, J Jee, A C Marvin, B Loader, S J Porter

Electronic Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Anechoic chambers are used for both emission and immunity testing but the ferrite tiles used to line the inside of the chamber are extremely expensive. This paper describes a method of reducing the number of tiles, whilst ensuring a reliable test environment.

The quality of a chamber is assessed by the magnitude of the difference between the Normalised Site Attenuation (NSA) inside the chamber, and the theoretical NSA of free space. The chamber being acceptable if this is less than 4 dB at all frequencies in the range of interest.

A genetic algorithm is used to optimise the layout of tiles with only 80% of the chamber walls covered. TLM[5] modelling is used to determine the NSA in the chamber. Measurements provided for comparison show that the optimised tile layout with 80% coverage gives results as good as a fully lined chamber.

Original language	English
Title of host publication	EMC YORK 99: INTERNATIONAL CONFERENCE AND EXHIBITION ON ELECTROMAGNETIC COMPATIBILITY
Place of Publication	EDISON
Publisher	INST ELECTRICAL ENGINEERS INSPEC INC
Pages	59-64
Number of pages	6
ISBN (Print)	0-85296-716-0
DOIs	https://doi.org/10.1049/cp:19990245
Publication status	Published - 1999
Event	IEE International Conference and Exhibition on Electromagnetic Compatibility - YORK Duration: 12 Jul 1999 → 13 Jul 1999

Conference

Conference	IEE International Conference and Exhibition on Electromagnetic Compatibility
City	YORK
Period	12/07/99 → 13/07/99

Keywords

TLM

Access to Document

10.1049/cp:19990245

Cite this

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title = "A method of reducing the number of ferrite tiles in an absorber lined chamber",

abstract = "Anechoic chambers are used for both emission and immunity testing but the ferrite tiles used to line the inside of the chamber are extremely expensive. This paper describes a method of reducing the number of tiles, whilst ensuring a reliable test environment.The quality of a chamber is assessed by the magnitude of the difference between the Normalised Site Attenuation (NSA) inside the chamber, and the theoretical NSA of free space. The chamber being acceptable if this is less than 4 dB at all frequencies in the range of interest.A genetic algorithm is used to optimise the layout of tiles with only 80% of the chamber walls covered. TLM[5] modelling is used to determine the NSA in the chamber. Measurements provided for comparison show that the optimised tile layout with 80% coverage gives results as good as a fully lined chamber.",

keywords = "TLM",

author = "J Clegg and M Alexander and Linda Dawson and Dawson, {J F} and J Jee and Marvin, {A C} and B Loader and Porter, {S J}",

year = "1999",

doi = "10.1049/cp:19990245",

language = "English",

isbn = "0-85296-716-0",

pages = "59--64",

booktitle = "EMC YORK 99: INTERNATIONAL CONFERENCE AND EXHIBITION ON ELECTROMAGNETIC COMPATIBILITY",

publisher = "INST ELECTRICAL ENGINEERS INSPEC INC",

note = "IEE International Conference and Exhibition on Electromagnetic Compatibility ; Conference date: 12-07-1999 Through 13-07-1999",

}

Clegg, J, Alexander, M, Dawson, L , Dawson, JF, Jee, J, Marvin, AC, Loader, B & Porter, SJ 1999, A method of reducing the number of ferrite tiles in an absorber lined chamber. in EMC YORK 99: INTERNATIONAL CONFERENCE AND EXHIBITION ON ELECTROMAGNETIC COMPATIBILITY. INST ELECTRICAL ENGINEERS INSPEC INC, EDISON, pp. 59-64, IEE International Conference and Exhibition on Electromagnetic Compatibility, YORK, 12/07/99. https://doi.org/10.1049/cp:19990245

TY - GEN

T1 - A method of reducing the number of ferrite tiles in an absorber lined chamber

AU - Clegg, J

AU - Alexander, M

AU - Dawson, Linda

AU - Dawson, J F

AU - Jee, J

AU - Marvin, A C

AU - Loader, B

AU - Porter, S J

PY - 1999

Y1 - 1999

N2 - Anechoic chambers are used for both emission and immunity testing but the ferrite tiles used to line the inside of the chamber are extremely expensive. This paper describes a method of reducing the number of tiles, whilst ensuring a reliable test environment.The quality of a chamber is assessed by the magnitude of the difference between the Normalised Site Attenuation (NSA) inside the chamber, and the theoretical NSA of free space. The chamber being acceptable if this is less than 4 dB at all frequencies in the range of interest.A genetic algorithm is used to optimise the layout of tiles with only 80% of the chamber walls covered. TLM[5] modelling is used to determine the NSA in the chamber. Measurements provided for comparison show that the optimised tile layout with 80% coverage gives results as good as a fully lined chamber.

AB - Anechoic chambers are used for both emission and immunity testing but the ferrite tiles used to line the inside of the chamber are extremely expensive. This paper describes a method of reducing the number of tiles, whilst ensuring a reliable test environment.The quality of a chamber is assessed by the magnitude of the difference between the Normalised Site Attenuation (NSA) inside the chamber, and the theoretical NSA of free space. The chamber being acceptable if this is less than 4 dB at all frequencies in the range of interest.A genetic algorithm is used to optimise the layout of tiles with only 80% of the chamber walls covered. TLM[5] modelling is used to determine the NSA in the chamber. Measurements provided for comparison show that the optimised tile layout with 80% coverage gives results as good as a fully lined chamber.

KW - TLM

U2 - 10.1049/cp:19990245

DO - 10.1049/cp:19990245

M3 - Conference contribution

SN - 0-85296-716-0

SP - 59

EP - 64

BT - EMC YORK 99: INTERNATIONAL CONFERENCE AND EXHIBITION ON ELECTROMAGNETIC COMPATIBILITY

PB - INST ELECTRICAL ENGINEERS INSPEC INC

CY - EDISON

T2 - IEE International Conference and Exhibition on Electromagnetic Compatibility

Y2 - 12 July 1999 through 13 July 1999

ER -