Frequency-dependent oscillating wall stirrer for measurement of quality factor in a reverberation chamber

Ji, Jingkang; Zhou, Xiang; Hu, Peng

doi:10.1109/iccce48422.2019.9010772

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…As mentioned before, the electric field inside a cavity is a desired reverberant field or at the overmode state. Thus, we could use the theory proposed by Hill and get the frequency-domain Q [10,11] by using two antennas and a vector network analyzer (VNA).…”

Section: Determinate the Q Value Of Rc Or Cavitymentioning

confidence: 99%

“…Since the field in the cavity is a statistical field, the confidence interval of the estimated field should be considered. The upper and lower quantiles under 95 percent confidence intervals are described as Equations (11) and (12) by using the extreme value distribution under reverberant field.…”

Section: Predict the Electric Field In The Cavitymentioning

confidence: 99%

“…3, only one antenna is used. Because the absorbing material is passive, the antenna is used to simulate the radiation emission of the loading object of CAVITY, that is, P t in Equations (10) and (11). In practical application, the average radiation emission power P t of the electronic equipment can be tested by RC according to IEC 61000-4-21.…”

Section: Measurement Approachmentioning

confidence: 99%

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Prediction of Electric Field in the Loaded Cavity Based on the Theory of Reverberation Chambers

Chen¹,

Zhou²,

Ji³

et al. 2021

PIER M

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The shielding cavity loaded with electronic equipment inside has a high Q value and is in overmode at relatively high frequency as a reverberation chamber (RC), but it does not have stirrers or paddles. However, the electromagnetic environment in the cavity is similar to that in the reverberation chamber working in frequency stirring mode or source stirring mode because of the certain bandwidth of the electronic equipment and the movement of the portable electronic equipment. Therefore, the electric field in the cavity can be predicted based on the theory of reverberation chamber. In order to predict the electric field in a given shielding cavity after loading additional electronic equipment, the determination method of the Q value of the cavity and the absorption cross section (ACS) of the electronic equipment, the influence of the ACS on the Q value of the cavity, and the relationship between the Q value and electric field are analyzed. Firstly, the ACS and radiated emission power of the loading electronic equipment are measured in the RC. Then, the Q value of the cavity with the electronic equipment loaded inside is calculated by the known Q value of the cavity without the electronic equipment and the ACS of the electronic equipment. Finally, the electric field in the cavity loaded with electronic equipment is estimated by using the calculated Q value of the loaded cavity and the measured radiated emission power of the electronic equipment. The experimental results verify the effectiveness of the prediction method.

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Section: Determinate the Q Value Of Rc Or Cavitymentioning

confidence: 99%

Section: Predict the Electric Field In The Cavitymentioning

confidence: 99%