In this article, we provide a comprehensive review of past and present efforts in the field of
microwave nonreciprocity with an emphasis on the most commonly used nonreciprocal …

While purely digital phased arrays were once discarded as simultaneous transmit and
receive (STAR) capable platforms, this notion has recently been reconsidered. Previous …

One of the earliest references to reciprocity as an underlying symmetry within a system dates
back to the 1828 work of Green in electrostatics, relating the interchanging electric potential …

Designing circulator as an antenna interface device becomes a daunting task, particularly
active‐quasi circulator. This article focuses on demonstrating the basic operation principle …

Recent research has revealed the possibility to achieve non-magnetic non-reciprocity using
time variance. However, prior CMOS-based circulators rely on the interference between non …

This letter presents an overview of unidirectional loop metamaterial (ULM) structures and
applications. Mimicking electron spin precession in ferrites using loops with unidirectional …

This paper introduces a detailed methodology for the realization of multi-functional
transversal resonator-based non-reciprocal bandpass filters (NR-BPFs) that combine the …

In recent years, circuit design of high-frequency active quasi-circulator for full-duplex
wireless systems have attracted wide attention in the area of Microwave and Radio …

Recently demonstrated non-magnetic circulators rely on the interference between a linear
periodically time-varying nonreciprocal gyrator and reciprocal passive microwave circuits …

In this paper, a tunable quasi-circulator (QC) is proposed, which consists of a compact fully-
reconfigurable 180° hybrid and two amplifier stages in the transmitter (TX)-and receiver (RX) …