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

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...

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Vydané v:IEEE microwave and wireless technology letters (Print) Ročník 34; číslo 6; s. 833 - 836
Hlavní autori: Li, Shuping, Gao, Donglin, Vosoughitabar, Shaghayegh, Wu, Chung-Tse Michael
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Piscataway IEEE 01.06.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:
Actuators
Antenna arrays
Antenna radiation patterns
Antennas
Beam steering
Carrier frequencies
Coding
Direct antenna modulation (DAM)
Far fields
Frequency modulation
Harmonic analysis
Heart rate
Leaky waves
Metamaterials
metamaterials (MTMs)
Modulation
Power dividers
Radar antennas
Sequences
Signal detection
space-time-coding (STC)
Spacetime
spectrum efficiency
Transmission
transmitting array
vital sign detection
ISSN:2771-957X, 2771-9588
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Abstract 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° 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.
AbstractList 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° 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.
Author Vosoughitabar, Shaghayegh
Gao, Donglin
Wu, Chung-Tse Michael
Li, Shuping
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SubjectTerms Actuators
Antenna arrays
Antenna radiation patterns
Antennas
Beam steering
Carrier frequencies
Coding
Direct antenna modulation (DAM)
Far fields
Frequency modulation
Harmonic analysis
Heart rate
Leaky waves
Metamaterials
metamaterials (MTMs)
Modulation
Power dividers
Radar antennas
Sequences
Signal detection
space-time-coding (STC)
Spacetime
spectrum efficiency
Transmission
transmitting array
vital sign detection
Title Spectrum-Efficient Multitarget Vital Sign Monitoring Using Metamaterial-Integrated Space-Time-Coding Transmitting Array
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