Measured MIMO channel capacity of a virtual colocated tri-polarized loop antenna

The channel matrix of a MIMO (multiple-input multiple-output) system composed of a virtual colocated tripolarized loop (TPL) antenna is measured in an anechoic chamber and an office room. Results show that in both scenarios, the TPL antenna can obtain a nearly 3 fold capacity increase over the one-polarized loop (OPL) antenna, and can obtain a nearly 1.5 fold capacity increase over the dual-polarized loop (DPL) antenna. Furthermore, in both scenarios, using the TPL antenna can obtain 3 nonzero eigenvalues, which indicates that three effective parallel channels can be generated. Numerical computations are also conducted by commercial software Ansoft HFSS, the simulated capacity results agree basically with the measured results.