Measuring cooperative massive MIMO in reverberation chamber

Design, analysis, and validation of Radio Research Agency reverberation chamber

“…The generalized Weyl formula for the number of modes (N( f )) calculations (1) or modal density (m) (2) 14 are used for the rough estimation of simple LUF of RC based on its geometrical dimensions, without incorporating the chamber loading (stirrer) and the effects of RC inherent losses and uncertainties in it. For example, the computed LUF using the number of modes (1) and modal density formula of (2) is around 108 and 78 MHz, respectively (see Figure 3), for RRA RC.…”

“…Reverberation chamber (RC) has gained a lot of interest in recent times in the radio frequency (RF) community for the fast testing of various antenna systems characterizations for 5G and Internet of things (IoT) applications, shielding effectiveness measurements, material characterizations in terms of absorber cross-section, antennas radiation and efficiency measurements, and the electromagnetic (EM) interference (EMI) or EM compatibility (EMC) compliance testing of various devices under tests (DUTs). [1][2][3] The RC is a shielded enclosure that is made of highly conductive materials. 4,5 The modal structure of EM field inside the RC can be varied by the following single or combination of methods: movement of stirrers (mechanical stirring), change of the source frequency (frequency stirring), change of the position, orientation or polarization of the placed antenna, and DUT.…”

“…4,5 The modal structure of EM field inside the RC can be varied by the following single or combination of methods: movement of stirrers (mechanical stirring), change of the source frequency (frequency stirring), change of the position, orientation or polarization of the placed antenna, and DUT. 1,2,6 The purpose of applying the aforementioned stirring procedures is to obtain the statistically uniform, homogenous, and isotropic EM field distribution inside the RC. 7 The assurance of the statistical uniformity and isotropy of the randomized homogeneous spatial EM fields in RC is essential before the performing of any kind of testing in RC.…”

“…2,4,5,8 The EMI/EMC testing of a DUT or performing any other kind of testing in RC such as antenna radiation efficiency measurements 9,10 demands the accurate determination of the LUF of the chamber. 1,2,4 The LUF of the chamber can be computed using modal density formulas 3,11 or through the field uniformity analysis of RC internal generated EM fields. The former approach is based on the theoretical cavity modal density calculations, and it is used for the rough approximation of the LUF.…”

“…Reverberation chamber (RC) has gained a lot of interest in recent times in the radio frequency (RF) community for the fast testing of various antenna systems characterizations for 5G and Internet of things (IoT) applications, shielding effectiveness measurements, material characterizations in terms of absorber cross‐section, antennas radiation and efficiency measurements, and the electromagnetic (EM) interference (EMI) or EM compatibility (EMC) compliance testing of various devices under tests (DUTs) 1‐3 …”