Experimental investigation of 2×2 MIMO array antenna for the mobile WiMax by measuring 3D radiation patterns

This paper investigates four types of array configurations with two chip antennas by considering mutual coupling and envelop correlation coefficient from 3D radiation patterns. According to proper spacing and polarization between antennas, diversity performance may be determined. The envelop correlation coefficients calculated using scattering parameters may be inadequate because the uniform distribution of sources is assumed. The radiation-pattern-based method for the envelop correlation coefficients can include real environmental factors like angular density function.