A compact low-loss one-way transmission structure based on nonreciprocal coupling

Abstract

Based on Magnetic Plasmon States and the coupling effect, a compact low-loss one-way transmission structure is proposed. The structure is composed of a two-way transmission line channel and a one-way ferrite loop channel. The length of the structure has an inverse relationship with working frequency. By applying a static bias magnetic field, One-Way Edge States of ferrite on the surface of the loop are excited, which results in the unidirectional coupling between the two channels. Excellent forward transmission efficiency can be achieved due to the cutoff of the forward coupling. On the other hand, the good coupling of the reversed transmission ensures good isolation between the two ports of the two-way channel. To validate the design, a prototype has been fabricated and measured. Both the simulation and experiment results verify the low-loss one-way transmission property.