Nonreciprocal Components Based on Switched Transmission Lines
Nonreciprocal Components Based on Switched Transmission Lines
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DOI：
10.1109/tmtt.2018.2859244
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发表时间：
2018-11-01
影响因子：
4.3
通讯作者：
Krishnaswamy, Hanish
中科院分区：
文献类型：
--
作者：
Nagulu, Aravind;Dinc, Tolga;Krishnaswamy, Hanish
非互易元件，如隔离器和环行器，是无线通信和雷达应用的关键。传统上，非互易元件已经使用铁氧体材料实现，其在外部磁场的影响下表现出非互易性。然而，铁氧体材料不能集成到IC制造工艺中，因此体积大且昂贵。在最近的过去，已经有强烈的兴趣，在实现非互易性在一个兼容的方式使用时空调制。在本文中，我们提出了一种通用的方法，基于开关传输线的非互易性。开关传输线实现了宽带、无损和紧凑的非互易性以及广泛的非互易功能，包括非互易移相器、超宽带回转器和隔离器、变频隔离器以及高线性度/高频/超宽带环行器。我们提出了一个详细的理论分析，影响插入损耗的各种非理想性，并提供设计指南。实验结果验证了该理论，从分立元件为基础的回转器和隔离器和一个25 GHz的环行器在45 nm SOI CMOS工艺制造。
Nonreciprocal components, such as isolators and circulators, are critical to wireless communication and radar applications. Traditionally, nonreciprocal components have been implemented using ferrite materials, which exhibit nonreciprocity under the influence of an external magnetic field. However, ferrite materials cannot be integrated into IC fabrication processes and, consequently, are bulky and expensive. In the recent past, there has been strong interest in achieving nonreciprocity in a nonmagnetic IC-compatible fashion using spatio-temporal modulation. In this paper, we present a general approach to nonreciprocity based on switched transmission lines. Switched transmission lines enable broadband, lossless, and compact nonreciprocity and a wide range of nonreciprocal functionalities, including nonreciprocal phase shifters, ultra-broadband gyrators and isolators, frequency-conversion isolators, and high-linearity/high-frequency/ultra-broadband circulators. We present a detailed theoretical analysis of the various nonidealities that impact insertion loss and provide design guidelines. The theory is validated by experimental results from discrete-component-based gyrators and isolators and a 25-GHz circulator fabricated in a 45-nm SOI CMOS technology.