This invention relates to analog phase shifters, and more particularly, to analog phase shifters for controlling the phase of an RF signal over a wide range of frequencies with nearly linear phase change. An exemplary phase shifter includes a front end high-low pass filter, a back-end high-low pass filter, and an all-pass filter coupled in series between the two high-low pass filters. At least one of the filters is tunable for controlling the phase of an input signal over a wide range of frequencies. The high-low pass filter comprises low-pass filters as input and output interface for the high-low pass filter to facilitate impedance match for receiving and outputting RF signal.