Noncontact Vital Sign Detection using 24GHz Two-Dimensional Frequency Scanning Metamaterial Leaky Wave Antenna Array

This paper presents a noncontact vital sign detection scheme using a two-dimensional (2-D) frequency scanning metamaterial leaky wave antenna (L W A) array at 24 GHz band. To avoid the self-resonance issue of interdigital capacitors and the parasitic inductance of shorted stubs, gap capacitors and vialess open stub-loaded resonators are applied to design a one-dimensional (1-D) frequency scanning metamaterial L W A which has a wide scanning angle from −62° to +71° as the frequency increased from 23.4 to 25.4 GHz, in which the broadside is at 24.1 GHz. Four 1-D frequency scanning meta material LWAs and a series feeding network are combined to realize 2-D beam scanning. Noncontact vital sign detections using the proposed 2-D frequency scanning metamaterial L W A array can detect multiple persons with different heights. For demonstration, the respiration rate and heartbeat rate of two persons with standing and sitting postures are measured.

[1]  Tatsuo Itoh,et al.  Dominant mode leaky-wave antenna with backfire-to-endfire scanning capability , 2002 .

[2]  Byung-Kwon Park,et al.  Arctangent Demodulation With DC Offset Compensation in Quadrature Doppler Radar Receiver Systems , 2007, IEEE Transactions on Microwave Theory and Techniques.

[3]  Jenshan Lin,et al.  Optimal Carrier Frequency of Non-contact Vital Sign Detectors , 2007, 2007 IEEE Radio and Wireless Symposium.

[4]  Jian Li,et al.  Accurate Doppler Radar Noncontact Vital Sign Detection Using the RELAX Algorithm , 2010, IEEE Transactions on Instrumentation and Measurement.

[5]  Jiang Long,et al.  Instrument-Based Noncontact Doppler Radar Vital Sign Detection System Using Heterodyne Digital Quadrature Demodulation Architecture , 2010, IEEE Transactions on Instrumentation and Measurement.

[6]  T. Itoh,et al.  Ring-Resonator-Inspired Power Recycling Scheme for Gain-Enhanced Distributed Amplifier-Based CRLH-Transmission Line Leaky Wave Antennas , 2012, IEEE Transactions on Microwave Theory and Techniques.

[7]  Jenshan Lin,et al.  Design and Analysis of a 60-GHz CMOS Doppler Micro-Radar System-in-Package for Vital-Sign and Vibration Detection , 2013, IEEE Transactions on Microwave Theory and Techniques.

[8]  Jim S. Sun,et al.  Microwave metamaterials‐based ultrafast detecting scheme for automotive radars , 2015 .

[9]  Chung-Tse Michael Wu.  A real-time multiple target detecting scheme based on microwave metamaterials , 2015, 2015 European Microwave Conference (EuMC).

[10]  C. Wu,et al.  Two-dimensional full-hemisphere frequency scanning array based on metamaterial leaky wave antennas and feed networks , 2016, 2016 IEEE MTT-S International Microwave Symposium (IMS).

[11]  Chia-Hung Chao,et al.  Noncontact vital-sign radar sensor using metamaterial-based scanning leaky-wave antenna , 2016, 2016 IEEE MTT-S International Microwave Symposium (IMS).

[12]  Chung-Tse Michael Wu,et al.  3D remote sensing based on frequency scanning metamaterial antenna array using linear sampling method , 2017, 2017 IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM).

[13]  Tzyy-Sheng Horng,et al.  Detection of vital signs for multiple subjects by using self-injection-locked radar and mutually injection-locked beam scanning array , 2017, 2017 IEEE MTT-S International Microwave Symposium (IMS).