The realization and analysis of polarization diversity in WiBro MIMO antenna

Multi-input multi-output (MIMO) communication systems have received a great attention because it increases the channel capacity by using multiple transmitter and receiver (G.J.Foschini and M.J.Gans). However, the spatial correlation between antennas causes the loss of spectral efficiency. To reduce the spatial correlation, the space, polarization, and pattern diversity techniques are most widely used. The polarization of PIFA can be changed by different feed ports (Y.Liu, et al). By using techniques of vertical and horizontal feeding, this paper proposed polarization diversity system by two array antenna which can apply wireless broadband (WiBro) application in US and Canada. Also, the analysis of the polarization diversity in the view point of capacity is presented. The CST micro wave studio(MWS) is employed to simulate the scattering parameters and radiation patterns in this paper.