A microwave power divider based on spoof surface plasmon polaritons

A microwave power divider based on spoof surface plasmon polaritons was presented here. The proposed divider was composed of two different sizes of periodic circular hole array metal strips on a substrate with relative dielectric constant of 3.3, loss angle of 0.003 and thickness of 0.76 mm. Compared to rectangular hole and rectangular groove, the dispersion curve of circular hole was more deviated from the light line and the cut-off frequency was lowest. The simulated results show the S21 and S31 of the power divider are equal and about 3dB with the cut-off frequency of 10.8 GHz which means the input power is divided into two outports equally. According to the planar structure, the proposed divider has some significant advantages such as high confinement, adjustability and easy integration which can play an important role in the microwave communication circuits and systems.