Abstract: It is designed that novel ultra-wideband quasi-coaxial one point six power divider according to RCL in this paper, the design and simulation results are that the return loss of input and output ports is less than -23 dB, the signal insertion loss in frequency band is less than 0.61 dB, the phase unbalance between output ports is ±5°at 6 GHz~18 GHz. The theory of RCL′s characteristic impedance and loss are analyzed in the paper, and the manufacturing method of novel quasi-coaxial structure is introduced. In the measurement process, back-to-back test is adopted, the loss is less than 1.08 dB, and measured results show that comparing to the traditional microstrip line power divider′s, combining insertion loss of novel quasi-coaxial power divider is reduced by 50%.