By analyzing the circuit characteristics of simplified right/left handed transmission line (SRLH TL) and utilizing its nonlinear phase features, a planar, low insertion loss 180° phase shift power divided is designed.Firstly,a 45° phase difference between the SRLH TL and the conventional TL is obtained by adjusting the parameters. Then, a 180° phase shift is designed based four cascaded units,which is utilized for broadband 180° phase shift power divider.The measured results indicated that the proposed 180° phase shift power divider achieves 3~8.3 GHz bandwidth with return loss of less than -10 dB,isolation of more than 17 dB, magnitude difference of less than 0.6 dB and phase difference of 180° ± 5°.The proposed divider has the features of good performance and low cost and is suitable for broadband antenna feed system.