Antenna Design for Robust Millimeter Wave LoS-MIMO Link in Mobile Analog Repeater Achieving Low Latency and High Capacity

This paper proposes an antenna design suitable for a mobile analog repeater with frequency-to-spatial multiplexing do-main conversion (FSMDC) among access and backhaul link. The relaying scheme with FSMDC, which we had proposed, converts wider band frequency multiplexing in access link into spatial multiplexing for the backhaul link only with analog circuits, and it achieves low latency and high capacity in millimeter wave spectrum. However, the typical scenario where the millimeter wave repeater is operated is LoS environment, and spatial multiplexing (i.e. LoS-MIMO) gain is not secured due to its dependency to the communication distance. For the robustness, the proposed antenna design is optimized by applying cost functions, that can achieve better channel capacity of FSMDC at any communication distance, as the fitness in genetic algorithm. The simulation results show its robustness to the communication distance of the LoS MIMO Links.