PHASE SHIFTING CIRCUIT, ANTENNA FEED SYSTEM AND COMMUNICATION DEVICE

Provided in the present application are a phase shifting circuit, an antenna feed system and a communication device. The phase shifting circuit comprises an input end, an output end, a phase leading branch circuit and a phase lagging branch circuit, wherein the phase leading branch circuit and the phase lagging branch circuit are connected in parallel between the input end and the output end. The phase leading branch circuit comprises a first radio-frequency switch unit and a phase leading unit, wherein the first radio-frequency switch unit and the phase leading unit are connected in series between the input end and the output end. The phase lagging branch circuit comprises a first phase lagging unit, a second phase lagging unit and a second radio-frequency switch unit, wherein the first phase lagging unit and the second phase lagging unit are connected in series between the input end and the output end, and the second radio-frequency switch unit is connected between a first connection point, which is between