Research on Beam Widening of Rotman Lens

Abstract

In this paper, the ubiquitous muti-beam beamwidth of the Rotman lens is tentative studied using widening technique. Phase weighted beam synthesis is adopted, and matched cables are connected between ports of the lens array and antennas. The measured widening pattern and un-widening pattern are compared, which demonstrates that the beam of the Rotman lens can be widened through phase weighting. Then, the measured database is analyzed. Results show that, the phase deviation of phase value inputted into the ports of the lens array must be considered when widening the beam.