Improvement of EM Diffusion Performance of Checkerboard Structure in 28 GHz Band

Recently, 5G wireless communications system has been deployed in 28 GHz band. Due to high propagation loss of EM waves, there are few paths which can reach receiving antenna when a blockage exists. In order to increase number of propagation paths and increase EM coverage for the system, checkerboard structures for diffusing EM waves emitted from transmitting antenna has been designed. The EM diffusion performance for different number of scattering elements was numerically evaluated and it was found that EM diffusion performance can be significantly improved by inverting the reflection phase of one element in the checkerboard pattern.