A Near-/Far-Field Dual-Mode Self-Injection-Locked Sensor for Versatile Noncontact Respiratory Monitoring Scenarios

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

IEEE Transactions on Microwave Theory and Techniques Pub Date : 2026-10-01 Epub Date: 2026-09-14 DOI:10.1109/TMTT.2026.3730913

Guanghao Fan;Han Wang;Meng Yang;Yongxin Guo

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引用次数: 0

Abstract

This article proposes a novel near-field (NF)/far-field (FF) dual-mode self-injection-locked sensor (DMSILS) for noncontact respiratory monitoring across diverse application scenarios. The DMSILS architecture integrates four core functional blocks: a dedicated dual-injection-mode oscillator (DIMO), an RF reconfigurable front-end module (RFEM), a power detection module (PDM), and a sensing antenna. The DIMO achieves injection locking by leveraging either injection-port impedance variation or frequency pulling induced by the injected signal. The RFEM incorporates two single-pole-double-throw (SPDT) switches to enable mode switching. The PDM converts the frequency-modulated signal into a voltage-domain respiratory waveform. The dual-mode architecture offers high operational flexibility: the NF mode enables bypassing path interference and operating effectively in confined spaces, whereas the FF mode enables extended-range sensing. Comprehensive experiments in both modes validate the performance and practical potential of the proposed DMSILS.

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一种用于多用途非接触式呼吸监测场景的近/远场双模自注入锁定传感器

本文提出了一种新型的近场/远场双模自注入锁定传感器（DMSILS），用于各种应用场景的非接触式呼吸监测。DMSILS架构集成了四个核心功能模块：专用双注入模式振荡器（DIMO）、射频可重构前端模块（RFEM）、功率检测模块（PDM）和传感天线。DIMO通过利用注入信号引起的注入端口阻抗变化或频率拉升来实现注入锁定。RFEM采用两个单极双掷（SPDT）开关来实现模式切换。PDM将调频信号转换为电压域呼吸波形。双模架构提供了高度的操作灵活性：NF模式可以绕过路径干扰并在受限空间内有效运行，而FF模式可以实现扩展范围的传感。在两种模式下的综合实验验证了所提出的DMSILS的性能和应用潜力。

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.