A 28GHz Magnetic-Free Non-Reciprocal Passive CMOS Circulator Based on Spatio-Temporal Conductance Modulation

📋 论文概要

提出一种基于时空电导调制的28GHz无磁非互易无源CMOS环形器，解决了硅基毫米波系统中低损耗共享天线接口的难题，实现了高线性度、隔离度和带宽。

💡 主要创新点

• 首次在CMOS工艺中实现无磁非互易环形器，利用时空电导调制打破洛伦兹互易性。
• 采用无源结构实现低损耗和高线性度，适用于毫米波5G基站和全双工系统。

🏷 关键词

📄 原文摘要

A significant challenge for silicon-based mm-wave systems is a low-loss sharedantenna (ANT) interface with high linearity, isolation (ISO) and bandwidth (BW). Shared ANT interfaces with simultaneous transmit and receive capability are critical for mm-wave 5G base stations that need to simultaneously communicate with multiple users, FMCW-based radars, and emerging full-duplex systems [1]. Lorentz reciprocity is a fundamental property of any linear and time-invariant medium characterized by symmetric permittivity and permeability tensors. A three-port passive network cannot be reciprocal, lossless, and matched at all ports at the same time. As a result, a reciprocal, passive, matched shared-ANT interface, such as an electrical-balance duplexer (EBD) [2], has at least a 3dB theoretical loss (typically around 4dB at RF/mm-wave). This theoretical loss can be avoided by breaking Lorentz reciprocity. Conventional non-reciprocal circulators rely on

👥 作者与机构

Tolga Dinc, Harish Krishnaswamy

Columbia University, New York, NY