Effects of loading on independent samples and uniformity of a reverberation chamber

Abstract

In order to understand the effects of loading on the estimation of independent samples and the consequent effect on the chamber uniformity, a series of measurements have been performed in a reverberation chamber with different sets of loads. The relationship between independent samples, loading and uniformity has been evaluated from the measured results.

Measurement and Estimation Methodology for EMC and OTA Testing in the VIRC

“…10, the non-LoS unstirred component UC 2 contributes to the K-factor increase. Hence, mounting an absorber on the hatch door (where UC 2 is reflected from) lowers the RR [68] as can be seen in Fig. 12 (after the preloading).…”

“…In [10], it is shown that slightly loading a VIRC with an absorber decreases its Q-factor and, thereby, broadens the resonance bandwidths. This consequently increases the modal overlap and ensures a better fit to the theoretical Rician distribution [68], i.e., a lower RR. On the other hand, care needs to be taken not to overload the chamber with absorbers, which can have negative effects on its reverberation properties [69].…”

A8.4 - Test Method for Narrowband F/TDMA-based Wireless Sensor/Actuator Networks

“…the intrinsic channel can be tuned to emulate a particular environment by loading the RC e.g. with absorbers [9,[18][19][20][21][22]. This allows to omit an additional CE [23].…”

Ultra-narrowband communications : a feasibility study for the 2.4 gHz band

“…Moreover, as depicted in Figure 4.9, the non-LoS unstirred component, UC 2 , contributes to the K -factor increase. Hence, mounting an absorber on the hatch (where UC 2 is reflected from) lowers the RR [224] as can be seen from Figure 4.11 (after the preloading). At the same time, this will-to a large extent-not sacrifice the K -factor of the channel (see Figure 4.12).…”

“…This consequently 4. VIRC MEASUREMENT AND ESTIMATION METHODOLOGY increases the modal overlap and ensures a better fit to the theoretical Rician distribution [224], i.e., a lower RR. On the other hand, care needs to be taken not to overload the chamber with absorbers, which can have negative effects on its reverberation properties [225].…”