Broadband power divider with phase shifter

In order to improve the bandwidth of the circle polarization microstrip antenna, a broadband power divider with phase shift of 90° is presented in this paper. The power divider with phase shifter designed by lumped capacitance and inductance based on the phase characteristic of Composite Right/Left-handed Transmission Lines (CRLH-TLs). The simulation and measurement results show that the power divider with phase shifter is absolutely stable with in the band range of 1.1GHz~1.7GHz, the return loss are less than -12dB; the insert loss is -6dB to achieve the equal output power; the phase difference of the two outputs is 90 ° and the phase offset is less than ±3°.