On Measurement of Reverberation Chamber Time Constant and Related Curve Fitting Techniques

TY - GEN

T1 - On Measurement of Reverberation Chamber Time Constant and Related Curve Fitting Techniques

AU - Robinson, Martin Paul

AU - Zhang, Xiaotian

AU - Flintoft, Ian David

PY - 2015/8

Y1 - 2015/8

N2 - The reverberation chamber time constant quantifies how fast a reverberation chamber loses its stored energy at different frequencies, which makes it a very important parameter in many power related tests, such as the measurement of antenna efficiency, the measurement of absorption cross section, and the electromagnetic immunity test of electronic devices. The chamber time constant is usually obtained by doing regressions of power delay profile and calculating its gradient. But the shape of power delay profile can sometimes be distorted by the band limited window function applied in the frequency domain. A non-linear curve fitting technique which can cancel the effect of window function was developed, aiming to give a robust determination of the chamber time constant. With the help of this technique, window functions with much smaller bandwidth can be applied without introducing error in the evaluation of chamber time constant. In this paper, a 1 MHz wide window function in which only 10 samples of S21 are available was put under test and it was found a robust answer of chamber time constant can still be given by non-linear curve fitting techniques. Therefore the measurement time can be reduced and the frequency resolution of the chamber time constant can be increased at the same time.

AB - The reverberation chamber time constant quantifies how fast a reverberation chamber loses its stored energy at different frequencies, which makes it a very important parameter in many power related tests, such as the measurement of antenna efficiency, the measurement of absorption cross section, and the electromagnetic immunity test of electronic devices. The chamber time constant is usually obtained by doing regressions of power delay profile and calculating its gradient. But the shape of power delay profile can sometimes be distorted by the band limited window function applied in the frequency domain. A non-linear curve fitting technique which can cancel the effect of window function was developed, aiming to give a robust determination of the chamber time constant. With the help of this technique, window functions with much smaller bandwidth can be applied without introducing error in the evaluation of chamber time constant. In this paper, a 1 MHz wide window function in which only 10 samples of S21 are available was put under test and it was found a robust answer of chamber time constant can still be given by non-linear curve fitting techniques. Therefore the measurement time can be reduced and the frequency resolution of the chamber time constant can be increased at the same time.

U2 - 10.1109/ISEMC.2015.7256196

DO - 10.1109/ISEMC.2015.7256196

M3 - Conference contribution

SN - 978-1-4799-6615-8

SP - 406

EP - 411

BT - IEEE International Symposium on Electromagnetic Compatibility (EMC), 2015

PB - IEEE

CY - Dresden

T2 - Joint IEEE International Symposium on EMC and EMC Europe, Dresden 2015

Y2 - 16 August 2015 through 22 August 2015

ER -