EHF Rotman lens for electronic scanning antennas

This paper presents an electronic steering antenna system using microwave lens at EHF frequency band. It consists of two parts: beam forming network and array of radiating elements. The method of designing Rotman lens beam forming network is addressed, and the array antennas are realized using microstrip patches for easy fabrication. As an example, a 13-beam antenna with 9 array elements is modeled in FEKO and simulated using Method of Moments (MoM). Good electromagnetic performance is demonstrated.