300 GHz vector-sum phase shifter using InP DHBT amplifiers

초록

A vector-sum phase shifter that provides 90 degrees phase control with a positive signal gain is successfully demonstrated at WR-3 band. The integrated circuit consists of input and output microstrip power dividers and two InP DHBT amplifiers with a 300 GHz gain of 14.8 dB. The measurements on a fabricated phase shifter show offset phases of -46 degrees, -22 degrees, 0 degrees, 25 degrees, 57 degrees and signal gain of 7.7 to 10.1 dB at 300 GHz.