The design of a 60 GHz low loss hybrid phase shifter with 360 degree phase shift

This paper presents a 60 GHz low loss phase shifter characterized by 360 degree phase shift and low variation of insertion loss using GaAs pHEMT process. The circuit contains a reflection type phase shifter (RTPS) and a switch line type phase shifter (SLTPS). A pair of Schottky diodes connected by a length of microstrip line is terminated to the through and coupled ports of Lange coupler as reflective variable loads. The optimum performance is attained when the electronic length is 75 um and the total finger width is 40 um after simulation using Agilent Advanced Design System. A one bit switch line type phase shifter (SLTPS) is employed as a 0/π phase shifter. The measured results show that this 60 GHz hybrid phase shifter can achieve 360 degree phase variation with insertion loss varying from 7.5~10.7 dB.