Spectrum-Efficient Multitarget Vital Sign Monitoring Using Metamaterial-Integrated Space-Time-Coding Transmitting Array

被引:0
作者
Li, Shuping [1 ]
Gao, Donglin [1 ]
Vosoughitabar, Shaghayegh [1 ]
Wu, Chung-Tse Michael [1 ,2 ]
机构
[1] Rutgers State Univ, Elect & Comp Engn Dept, New Brunswick, NJ 08901 USA
[2] Natl Taiwan Univ, Dept Elect Engn, Taipei 10617, Taiwan
来源
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS | 2024年 / 34卷 / 06期
基金
美国国家科学基金会;
关键词
Direct antenna modulation (DAM); metamaterials (MTMs); space-time-coding (STC); spectrum efficiency; transmitting array; vital sign detection;
D O I
10.1109/LMWT.2024.3394972
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A metamaterial-integrated space-time-coding (STC) transmitting array incorporating direct antenna modulation (DAM) is proposed in this work to detect the multitarget vital sign signals, including respiration and heart rates. A series metamaterial (MTM) zeroth-order power divider is used to uniformly distribute the carrier signal to each element of the array. DAM, applied to each antenna element, creates a 180 $<^>{\circ}$ phase shift in the far-field while keeping the amplitude uniform, which is controlled via a programmed FPGA. By feeding specific time-modulated sequences to each antenna element, the radiation patterns of the resulting harmonic frequencies can be accurately directed toward different locations. Moreover, the modulation frequency is much less than the carrier frequency. This leads harmonic beam steering, to occupy a much narrower spectrum compared with frequency-dependent leaky wave antennas (LWAs), thereby enhancing spectral efficiency. The effectiveness of this MTM-integrated STC transmitting array in multitarget sensing is demonstrated through experimental tests involving various actuators and human subjects.
引用
收藏
页码:833 / 836
页数:4
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