Procedure of designing the structural parameters of a spatial fading emulator with a Laplacian angular power spectrum of incoming wave

This paper presents design procedure of a spatial fading emulator representing a Laplacian angular power spectrum of incoming wave applicable to the over-the-air (OTA) evaluation for a handset MIMO antenna. The emulator has a number of antenna probes located on a circle around a handset under tested. The radius of the circle arranging the antenna probes can be defined by the power ratio of waves emitted from each antenna probe. The number of the antenna probes can be determined by fading correlation of a two-dipole array. Moreover, the calibration procedure of an RF-controlled spatial fading emulator was also presented in this paper. The study presented in this paper was conducted under the collaboration between Tokyo Institute of Technology, Tokyo, Japan and Panasonic Corporation, Osaka, Japan.