A Microstrip line Reflection-Type Phase Shifter for 60 GHz Phased Array

A microstrip line reflection-type phase shifter is presented in this paper for 60 GHz mmWave phased array system. Based on the characteristic of varactor diode, an impedance-transforming quadrature coupler and a novel parallel resonant network are designed to extend the phase tuning range. To the best of our knowledge, it is the first time a uniplanar microstrip line phase shifter is implemented at 60 GHz to achieves 93.3° phase tuning range. The analytical equations are derived for the design theory, and EM simulation and measurement are conducted to prove the proposed concept.