Reconfigurable phased-arrays based on hybrid couplers in reflection mode

Abstract

This paper presents the design of antenna arrays of patches fed by microstrip hybrid branchline couplers in reflection mode as phase shifters. This topology permits the reduction of the number of FET, PIN diode or MEMS switches by two when compared with classic array feeding techniques. Two antenna prototypes are simulated, fabricated and measured. The results show beam steering capability over a 400 MHz band centered on 5.8 GHz with good matching performances.