A Magnet-Free Differential FBAR Filter Circulator for 2.45-GHz Wi-Fi Applications

IF 5.2 1区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Microwave Theory and Techniques Pub Date : 2026-09-01 Epub Date: 2026-07-23 DOI:10.1109/TMTT.2026.3713983

Wanchun Ren;Jie Zhang;Chun Li;Qin Wang;Zhaoye Wu;Zhiguo Lai;Bin Tang;Tao Zhou;Yang Gao

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引用次数: 0

Abstract

This article presents a magnet-free circulator for 2.45-GHz Wi-Fi systems, based on a differential film bulk acoustic resonator (FBAR) filter and radio frequency (RF) switch modulation. The design employs a high-Q cavity-type FBAR filter integrated into a linear time-invariant (LTI) network with synchronized spatiotemporal modulation, achieving nonreciprocal signal transmission with low insertion loss and high isolation. Simulation results demonstrate an isolation of 18.5 dB and an insertion loss of 2.4 dB. Experimental verification shows a measured isolation of 15.5 dB and insertion loss of 4.5 dB, outperforming existing magnet-free circulators in the same frequency band. The proposed circulator exhibits an ultralow power consumption of approximately 0.78 mW and a high figure of merit (FoM = 3-dB bandwidth/modulation frequency) of 40.80. The differential architecture effectively suppresses common-mode noise and alleviates the tradeoff between isolation and loss. This work illustrates the potential of FBAR-based circulators for compact, integrated wireless communication systems.

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用于2.45 ghz Wi-Fi应用的无磁差分FBAR滤波器环行器

本文提出了一种基于差分膜体声谐振器（FBAR）滤波器和射频（RF）开关调制的2.45 ghz Wi-Fi系统无磁环行器。该设计将高q腔型FBAR滤波器集成到具有同步时空调制的线性时不变（LTI）网络中，实现了低插入损耗和高隔离度的非互易信号传输。仿真结果表明，隔离度为18.5 dB，插入损耗为2.4 dB。实验验证表明，隔离度为15.5 dB，插入损耗为4.5 dB，优于同一频段现有的无磁环行器。所提出的环行器具有约0.78 mW的超低功耗和40.80的高品质系数（FoM = 3 db带宽/调制频率）。差分结构有效地抑制了共模噪声，减轻了隔离和损耗之间的权衡。这项工作说明了基于fbar的循环器在小型集成无线通信系统中的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Microwave Theory and Techniques 工程技术-工程：电子与电气

CiteScore

8.60

自引率

18.60%

发文量

486

审稿时长

6 months

期刊介绍： The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.