Diamond Configuration for Non-reciprocal Transmission

TL;DR

This paper introduces a novel four-node system scheme enabling non-reciprocal wave transmission and directional amplification of electromagnetic signals, achieving significant isolation and gain through optimized parameter design.

Contribution

It presents a new four-node configuration with optimized parameters that achieves high non-reciprocity and directional amplification in electromagnetic systems.

Findings

Non-reciprocity exceeding 12dB and 130dB in different configurations

Directional amplification with up to 40dB isolation

Potential for cascading systems for higher isolation and gain

Abstract

A system scheme is presented which allows non-reciprocal wave transmission or directional amplification of electromagnetic signals, using a boxed four-node method. Edges represent strong hopping interactions and diagonals stand for weak parametric interactions. Using careful optimization of values for design parameters, we are able to obtain non-reciprocity in excess of 12dB and 130dB for intrinsic and extrinsic configurations at identical input/output frequencies. For the directional amplification, an isolation as high as 40dB is demonstrated with forward/backward gains of $\pm$20dB. Cascading two such systems potentially can offer high isolations at high gains.