In this paper, we propose a 4-coupled ferroelectric-based meander-type microstrip-line tunable phase shifter which has less than 2dB of insertion loss (IL) and larger than 10dB of return loss (RL)over 13~170Hz .Particularly at 15GHz, the differential phase shift (DPS) is observed to be $89{circ}$ at zero bias and it increases up to $115{circ}$ when 150V is applied. This indicates a DPS tunability of $26{circ}$.