Correcting OATS antenna factors for small fully anechoic chambers

Hansen, D.; Ristau, D.; Lilienkamp, P.

doi:10.1109/isemc.2000.875566

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…Large measurement uncertainty is inherent in the measurement at 3-m range [1]. In addition to mutual coupling between the source and the receiver, the antenna factors supplied by the antenna manufacturer may be affected by up to 5 dB in the low frequency range due to interactions with the nearby walls [2]. Despite the problems, the high cost of 10-m range forces most manufacturers of electronic products to invest in 3-m range SAC for pre-compliance tests.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Anechoic Chamber Using a Beam-Tracing Technique

Chung¹,

Teh²,

Chuah³

2004

PIER

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Abstract-Building an anechoic chamber involves a substantial investment both financially and in physical space. Hence, there is much interest in trying to reduce the required investment while still maintaining adequate performance. The performance of an anechoic chamber depends on the type, size, and array configuration of the absorber elements as well as the geometry of the screened room on which the inner surfaces are covered with RF absorbers. If the room geometry is designed such that an electromagnetic ray from the transmitter will only reach the receiver antenna after a few reflections, the wave energy may be sufficiently damped after a few bounces off the absorbing walls and ceiling. Hence, lower cost RF absorbers can be used to make the anechoic chamber design more economical. In this paper, a variant of beam-tracing technique is used for modeling of anechoic chamber to study the normalized site attenuation (NSA) performance of the anechoic chamber. This allows the chamber performance to be predicted prior to the actual construction. The major advantage of beam-tracing over ray tracing is the path loss information at multiple receiver locations can be determined simultaneously as opposed to running a ray tracing simulation for each receiver location one at a time. As a result, the computing time is greatly reduced. This feature is particularly useful in calculating the field strength at different heights of the receiving antenna in EMC site calibration procedure. The efficient modeling tool has given rise to the successful design and construction of an asymmetrical shape anechoic chamber that supports various measurement needs including EMC tests at

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Section: Introductionmentioning

confidence: 99%

Modeling of Anechoic Chamber Using a Beam-Tracing Technique

Chung¹,

Teh²,

Chuah³

2004

PIER

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“…In 2000, Hansen, et.al. [2]'also reported perturbations of concern in the FAR . In 2001, papers were presented by P.A.…”

Section: Background Introductionmentioning

confidence: 93%

Radiated emission field perturbations due to accessories used in the FAR environment at 2, 10 & 18 GHz

Blankenship

Chase²

2003 IEEE Symposium on Electromagnetic Compatibility. Symposium Record (Cat. No.03CH37446)

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Radiated Emission measurements are usually performed in o,/acility that meets the Normalized Site Attenuation (NSA) Requirements of standards such as CISPR 22 and ANSI C63.4. These standards allow alternative sites such as a filly anechoic room (FAR) for preliminary measurements before final measurements are taken in an open area test site (OATS). The NSA requirementsjor both these test environments are evaluated in the absence of necessary accessories, such as the table on which test samples must be supported. Additionally, the standards offer only vague guidance on the materials and construction methods used

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EMI/EMC Chamber Design, Measurement, and Instrument

Chung

2016

Handbook of Antenna Technologies

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Correcting OATS antenna factors for small fully anechoic chambers

Cited by 6 publications

References 2 publications

Modeling of Anechoic Chamber Using a Beam-Tracing Technique

Modeling of Anechoic Chamber Using a Beam-Tracing Technique

Radiated emission field perturbations due to accessories used in the FAR environment at 2, 10 & 18 GHz

EMI/EMC Chamber Design, Measurement, and Instrument

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