A computer synthesized 2∼8 GHz printed rotman Lens with 9×8 input-to-output configuration

Rotman lens is well-known passive device for its broadband feature in terms of the true time delay and low dispersive properties. However, the broad bandwidth preserving optimal amplitude/phase performance does not come naturally in a system level design. In this paper, the presented printed lens has considered extensive parameters while performing a full wave structure evolution. Design concepts and important electrical parameters are studied in both FEKO and HFSS. While we focuses on the numerical synthesis of the lens, typical measurement of return loss is presented as well. The resulting lens has a 9×8 input-to-output configuration, operating from 2~8 GHz with outstanding phase/amplitude stability and scanning capability.