A Novel Mode-Stirred Reverberation Chamber Design for 5G Millimeter Wave Bands

Abstract

A novel mode-stirred reverberation chamber (RC) is designed and analyzed for millimeter wave bands. The size of the proposed RC with dimensions of 0.9 m◊0.9 m◊1.1 m is suitable for user equipment (UE) tests. Two Zshaped mode-stirrers are applied to generate a uniform field. To fulfill the communication and test requirements for user equipment, reference, measurement and link antennas with a large bandwidth are utilized, which can support both the frequency range (FR) 1 and FR2 bands of the 5G spectrum. The lowest usable frequency (LUF) and mode density were first calculated and examined. Then, the power transfer function (PTF) from 2 GHz to 40 GHz was obtained to verify the path loss. Three measurement campaigns were carried out to verify the accuracy of the RC. Firstly, the transmission power of the passive antenna for a conductive test was compared with the RC over the air (OTA) total radiated power (TRP) for single-tone signals. Then, signals with bandwidths of 100 MHz and 400 MHz were applied. A maximum power difference of only 0.8 dB was found in the above two experiments. Furthermore, the TRP for the same commercial 5G UE in both RC and compact antenna test range (CATR) systems was measured and compared. To the best of the authors' knowledge, this is the first work to provide TRP results for 5G millimeter wave bands in a RC. The test results show that the TRP values for the two systems are almost the same with a maximum deviation of 0.5 dB, while the time required to carry out tests using the RC is lower than that for the CATR system. INDEX TERMS reverberation chamber, millimeter wave, OTA, TRP.

Pushing the Boundaries of Antenna-Efficiency Measurements towards 6G in a mm-Wave Reverberation Chamber

“…As expected, the chamber loss increases over frequency. These results show, compared to other reverberation chambers operating at these frequencies, that the chamber used in this work has a significantly lower chamber loss [5], [8], [11]. With the settings used in these setups, the noise floor of the VNA was approximately at -100 dBm.…”

Experimental Investigation of 5G Base Station Functionalities in Reverberation Chamber at Millimeter-Wave

“…The RC is a richly multipath environment that does not represent the majority of real life scenarios, but by adding absorbing materials the RC load increases and the corresponding time delay spread progressively decreases thus allowing us to use it for wireless tests. The presence of absorbing panels reduces reflected signals and we are able to control the multipath richness in order to emulate the desired real life propagation environments [24], [25], [26]. By properly setting the RC loading, time delay spread reaches typically values encountered in real life environments.…”