RADIO FREQUENCY PHASE SHIFTER

Provided is a radio frequency phase shifter. The radio frequency phase shifter includes multiple sections of first transmission lines, multiple sections of second transmission lines, multiple mixers, and multiple couplers. Multiple sections of first transmission lines are sequentially connected to form a bus transmission line. Multiple sections of second transmission lines are sequentially connected to form another bus transmission line. Moreover, multiple sections of first transmission lines have a one-to-one correspondence with multiple sections of second transmission lines. One coupler is connected between two adjacent sections of first transmission lines. One coupler is connected between two adjacent sections of second transmission lines. One mixer is connected between the two corresponding couplers. In the case where two input signals with different frequencies are transmitted on two bus transmission lines respectively, the multiple mixers arranged in sequence output a group of output signals with a phase gradient. In this manner, two input signals with different frequencies are aliased on the periodic node (mixer) so that a group of signals with the same frequency but with a phase gradient can be generated. Moreover, the phase gradient can be changed by changing the input frequency, thereby achieving the phase scanning function.