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This paper presents a self-powered microwave sensing platform for precise methanol concentration detection in water. The system features a high-efficiency perfect metamaterial absorber (PMA) that conv...
We present an analysis and design methodology for high-sensitivity material sensors, based on the connection of a long-delay self-injection loop to an existing oscillator. The delay and attenuation of...
Detecting coating damage in dynamic environments remain an unaddressed challenge for Frequency Selective Surface (FSS)-based sensors, which struggle to differentiate coating wear from environmental no...
This study developed an Angle of Arrival (AoA) sensor integrated with a reconfigurable intelligent surface (RIS) to enable user tracking. The system employs a six-port network to detect angles within ...
To bridge the gap between force sensing technologies and wireless communication systems, this paper introduces a hybrid force spectrometer array with direct analog force-to-radio-frequency (RF) radiat...
This paper reports, for the first time, the capability of a single-channel continuous wave (CW) radar to perform through-the-wall concurrent vital sign monitoring of three subjects using a simpler rad...
This work introduces a new kind of asynchronous space-time-coding (ASTC) direct antenna modulation (DAM)-enabled radar sensor designed for automatic beam-scanning in multi-target vital sign monitoring...
Contactless Doppler cardiogram (DCG) detection provides critical and comprehensive health information by monitoring heart motion. However, existing techniques struggle to effectively eliminate respira...
Tu4A-4: Highly Sensitive Frequency- and Self-Injection-Locked Radar for Precise Vital Sign Detection
Noncontact vital sign sensing usually utilizes highly sensitive Doppler radars. Self-injection-locked (SIL) radars have been studied to have better sensing capabilities than traditional continuous wav...
This study used a 2.4 GHz four-channel phase- and quadrature self-injection-locked radar to detect vital signs of a moving person. A modified principal component analysis (MPCA) method was applied to ...