A 22-to-25GHz CMOS Non-Magnetic Balanced Circulator Achieving at Least 20dB TX-RX Isolation for an Antenna VSWR of 2

📋 论文概要

本文提出了一种22-25GHz CMOS非磁性平衡循环器，通过正交耦合器、平衡网络和（非）互易支路，解决了电平衡双工器插入损耗高和传统循环器在天线VSWR变化时隔离度下降的问题。实现了<5.2dB TX-ANT插入损耗、<4.2dB RX-ANT插入损耗和>20dB TX-RX隔离度，带宽>2.2GHz，支持全双工操作。

💡 主要创新点

• 提出非磁性平衡循环器结构，结合正交耦合器和平衡网络，在毫米波频段实现高隔离度同时保持低插入损耗。

📄 原文摘要

Abstract This paper presents a mm-wave non-magnetic balanced circulator that bridges the gap between the high insertion loss (IL) of electrical balance duplexers and the transmitter (TX)to-receiver (RX) isolation degradation of conventional circulators under varying antenna (ANT) voltage standing wave ratio (VSWR). Using quadrature couplers, a balance network, and (non)-reciprocal branches, it achieves <5.2dB TX-to-ANT IL, <4.2dB RX-to-ANT IL, and >20dB TX-to-RX isolation over a >2.2GHz bandwidth at VSWR=2. Full-duplex (FD) operation allows simultaneous transmission and reception at the same frequency, thereby enhancing spectral efficiency in communication systems [1] and enabling real-time sensing in radar applications [2]. However, a key challenge in FD systems lies in designing low-cost, compact, CMOS-compatible integrated-antenna (ANT) interfaces that do not only provide low insertion loss (IL), low noise, and large transmit-powerhandling capability, but also maintain high transmit

👥 作者与机构

Heqi Deng, Ehsan Shokrolahzade, Niels Fakkel, Marco Spirito, Fabio Sebastiano, Masoud Babaie

TU Delft, Delft, The Netherlands