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Analysis of shielded-room error for screened rooms and its application to low-frequency emission measurements from electrically small sources

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3 Author(s)
N. Izzat ; Dept. of Electr. & Electron. Eng., Bristol Univ., UK ; G. S. Hilton ; C. J. Railton

Screened rooms are an alternative to open area test sites for radiative emission measurements. The cost of screened anechoic rooms by comparison is considerable, especially for low-frequency operation. The paper considers the use of screened rooms operated below resonance in obtaining low-frequency emission measurements from electrically-small sources. The screened room is modelled as a lossless rectangular cavity using a rapidly convergent Green's function formulation. This is used to establish the shielded-room error for electric and magnetic current sources and examine the main coupling mechanisms between the source and observation point in a screened room. Emission measurements are presented for a self-contained electrically-small test source. Comparison with open-air measurements and emission measurements from a TEM cell show agreement to within ±5 dB

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IEE Proceedings - Science, Measurement and Technology  (Volume:143 ,  Issue: 4 )