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

Abstract

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/ʌ 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.Index Terms -60GHz, phase shifter, reflective variable load, switch line type , 360 degree.

94‐GHz 360° reflective‐type phase shifter with minimal loss variation using triple‐resonating load technique

“…3. It is observed that the simulated trajectory of Z L is always close to the reference circle which ensures a uniform insertion loss according to (7). Therefore, a minimised loss variation is achieved.…”

“…Thus, for the RTPS using triple-resonating load, to achieve zero loss variation, (3) should be the same as (7), which yields…”

“…Tech. Freq., GHz Range, deg Insertion loss (IL), dB [3] 90 nm CMOS 60 360 14.6 ± 3.0 [6] 65 nm CMOS 60 90 5.7 ± 1.2 [7] 0.15 μm GaAs 60 360 9.1 ± 1.6 [5] 0.13 μm SiGe 94 180 a 7.4 ± 0.5 [2] 0.13 μm SiGe 94 180 a NA this work 100 nm GaAs 94 360 9.0 ± 0.9 a Exclude the 180°phase shift provided by active phase inverter.…”