Research of a circulator based on spoof surface plasmon polaritons

Abstract

This paper shows a study of a new kind of circulator with spoof surface plasmon polaritons (SSPPs). In this letter, the combination of SSPPs and Y-junction in inner conductor is in consideration. SSPPs transmission mode and TEM mode is dominant in different band. That makes the broadband characteristic of the circulator. The structure is optimized in HFSS for better performance. From 4.5 GHz to 13.5 GHz, a strong circulation effect is observed and this proves that the nonreciprocal transmission characteristics are achieved skillfully. The circulator shows good nonreciprocal transmission characteristics. Moreover, the use of confinement electromagnetic waves can decrease the size of the ferrite and show a broadband characteristic.