Abstract
The colocated dual-polarized dipole (DPD) and dual-polarized loop (DPL) MIMO channel performances are compared. Computation results show that, for the ideal electric and magnetic dipoles, the dual-polarized MIMO systems have identical channel capacity. But the contour plots of the capacity gain of the realistic DPD and DPL are different, due to the difference in antenna patterns. The cumulative distribution function (CDF) of the capacity gain in the two-mirror (TM) channel shows that, for small distance, the capacity gain obtained by the DPD is obviously smaller than that of the DPL, but, with the increase of the distance, the difference gets smaller. A DPL with low mutual coupling is fabricated. Measured results show that high MIMO capacities can be obtained by this DPL in both the anechoic chamber (AC) and the realistic office room. The capacity gain of the DPL antenna is 1.5–1.99, which basically coincides with the theoretical and numerical results. Furthermore, the capacity of the virtual DPL antenna with no mutual couplings is also investigated. It is shown that, in the AC, the mutual coupling will generally decrease the dual-polarized MIMO capacity; however, in the office room, the effect of mutual coupling is not always negative.
Highlights
Multipolarized antenna can be used to detect vector electromagnetic field components, which is very attractive to wireless communication, localization, and navigation
In [9], we presented a multiple-input multiple-output (MIMO) antenna composed of two colocated, orthogonal dual-polarized loop (DPL), which has a constant current distribution along each loop and has a simulated y
The measured scattering parameters and the radiation patterns of the DPL antenna are presented in Figures 13 and 14, respectively
Summary
Multipolarized antenna can be used to detect vector electromagnetic field components, which is very attractive to wireless communication, localization, and navigation. Due to the constraints of feeding and mutual coupling, the colocated loops are difficult to realize; the measurement based characteristics of the dual-polarized multiple-input multiple-output (MIMO) channel using colocated loop antennas are seldom seen and whether similar MIMO performance can be obtained by the multipolarized loops to that of the multipolarized dipoles has not been verified. To study the effect of mutual coupling of the antennas on the dual-polarized MIMO capacity, the measurements based on a virtual DPL antenna are conducted, which is composed of two single loops having the same polarizations with that of the colocated DPL, but with no mutual couplings. The MIMO performances of the virtual DPL antennas with other combination of polarizations are studied, by which the other magnetic components can be utilized
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