A reflection-type tunable analog phase shifter applied to phased array system for S-band satellite communication was designed. The phase shifter expanded the bandwidth and improved the standing wave in the working frequency band by using a three-branch directional coupler. The L-shaped reflection load composed of a transmission line and a varactor diode enlarged the phase shift. The measurement results show that the phase shift reach 191°±1° in the uplink frequency band from 1.98 GHz to 2.01 GHz, and 186°±0.1° in the downlink frequency band from 2.17 GHz to 2.2 GHz. The insertion loss is better than 3.3 dB, and the fluctuation of insertion loss is less than 1 dB. The return loss is greater than 20 dB in the whole voltage tuning range. The proposed phased shifter is simple in structure, easy to tune and low in price, and had certain application value in the field of satellite communication.