Circulator based on spoof surface plasmon polaritons

TL;DR

This paper presents a design for a broadband circulator using spoof surface plasmon polaritons with blade structures, achieving good nonreciprocal transmission and reduced size through electromagnetic wave confinement.

Contribution

It introduces a novel circulator design based on SSPPs with blade structures and a matching transition, demonstrating broadband operation and miniaturization.

Findings

Isolation and return loss reach 15dB from 5 to 6.6 GHz

Insertion loss is less than 0.5dB

The design enables broadband and size reduction

Abstract

Circulators based on spoof surface plasmon polaritons are designed and analyzed. In the letter, we use blade structure to realize the propagation of SSPPs wave and a matching transition is used to feed energy from coplanar waveguide to the SSPPs. And the circulator shows good nonreciprocal transmission characteristics. The simulation results indicate that in the frequency band from 5 to 6.6 GHz, the isolation degree and return loss basically reaches 15dB and the insertion loss is less than 0.5dB. Moreover, the use of confinement electromagnetic waves can decrease the size of the ferrite and show a broadband characteristic.