Wireless IC doppler radars for sensing of heart and respiration activity

Borić–Lubecke, Olga; Droitcour, Amy D.; Lubecke, Victor M.; Lin, Jenshan; Kovacs, G.T.A.

doi:10.1109/telsks.2003.1246240

Cited by 16 publications

(8 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The field of wireless vital sign monitoring has a relatively long history, almost as long as radar itself [4][5][6]. Doppler radar has been the primary means of performing vital sign monitoring by using the backscatter signal from a beating heart [7][8][9]. Over the past 20 years, the advent of integrated chipsets, MMICs, microstrip circuits, miniature antennas, and better substrate materials have all contributed to large improvements in the cost and performance of small low-power radar units for many different applications.…”

Section: Vital Sign Measurementmentioning

confidence: 99%

Low-cost differential front-end for Doppler radar vital sign monitoring

Fletcher

Han

2009

2009 IEEE MTT-S International Microwave Symposium Digest

View full text Add to dashboard Cite

We present a differential front end design for improving the performance of short-range low-cost Doppler radars for vital sign detection with application to automotive driver safety systems, health monitoring, and security screening. By using dual helical antennas each with a 40-degree beamwidth, it is possible to illuminate the body in two adjacent locations to perform a differential measurement. Since only one of the beams illuminates the heart, the baseband signal from the second radar is used for motion cancellation. We demonstrate this approach using a custom-designed dual helical antenna and simple directconversion radar circuits implemented in microstrip operating at 2.460 GHz and 2.510 GHz., respectively. Heart rate data is shown for detection distances of 0.5 meter showing reduction in background motion noise compared to data from traditional single radar unit design.

show abstract

Section: Vital Sign Measurementmentioning

confidence: 99%

Low-cost differential front-end for Doppler radar vital sign monitoring

Fletcher

Han

2009

2009 IEEE MTT-S International Microwave Symposium Digest

View full text Add to dashboard Cite

show abstract

“…The average range of the peak-to-peak chest motion caused by respiration varies from 4 mm to 12 mm, whereas the chest displacement due to heartbeat alone is about 0.3 mm [3]. The measurement of this small displacement is the objective of this work and we are proposing the use of noncontact Doppler sensors for the remote monitoring of such signals.…”

Section: Introductionmentioning

confidence: 99%

Noncontact heartbeat detection at 2.4, 5.8, and 60 GHz: A comparative study

Obeid

Sadek

Zaharia

et al. 2009

Micro & Optical Tech Letters

View full text Add to dashboard Cite

Figure 6 shows a photograph of the fabricated novel parallel coupler with an area of 30 ϫ 44 mm 2 . CONCLUSIONSA novel high isolation microstrip parallel coupler with -shaped structure has been presented in this article. With -shaped structure, the proposed couplers achieve a physical size reduction of almost 35% with the performance competed with the conventional one. Adopting RPC approach, the isolation is improved greatly. A proposed parallel coupler has been fabricated and measured at 915 MHz. The measurement of the proposed parallel coupler exhibits maximum isolation of Ϫ58.4 dB and directivity of Ϫ40.4 dB at 915 MHz and the isolation is over Ϫ40 dB in 902-928 MHz frequency band. The proposed coupler is compact, easy for fabrication, which can be applied in radiofrequency identification reader system. 2. S. Uysal and H. Aghvami, Synthesis, design and construction of ultrawideband nonuniform directional couplers in inhomogeneous media, IEEE Trans Microwave Theory Tech 37 (1989), 969 -976. 3. M. Dydyk, Microstrip directional couplers with ideal performance via single-element compensation, IEEE Trans Microwave Theory Tech 47 ABSTRACT: The aim of this work is to provide two new schemes for human noninvasive heartbeat activity monitoring using low power microwave noncontact systems and direct conversion architecture. The first system is tested at 2.4 GHz and 5.8 GHz frequencies. Another system, operating at 60 GHz, is demonstrated where higher heartbeat sensitivity detection is achieved. ABSTRACT: A compact printed monopole antenna having small dimensions (22 ϫ 9.5 ϫ 1.6 mm 3 ) for the WLAN bands is presented. With the use of a plated-through via connecting a rectangular patch with a meandered strip on the both sides, the impedance matching in multiband operation covering 2.4, 5.2, and 5.8 GHz bands is obtained. A theoretical and experimental investigation of the antenna is given.

show abstract

“…Previous work tends to detect life signs [4][5], respiration rates and heartbeat rates using fixed frequency and fixed power of the transmitted signal [6][7][8]. In this work, a new system for heartbeat detection is proposed with the ability of tuning both frequency and power.…”

Section: Introductionmentioning

confidence: 99%

A Tunable System for Contact-Less Heartbeat Detection and a Modeling Approach

Obeid

Sadek

Zaharia

et al. 2009

2009 IEEE International Conference on Communications Workshops

View full text Add to dashboard Cite

The aim of this work is to present a practical study to detect heartbeats from distance, as well as cardiopulmonary activity modeling and simulation, in order to separate the heart and the respiration signals. Using a Vector Network Analyzer, measurements are taken at 2.4, 5.8, 10, 16 and 60 GHz. The Matlab simulation permits comparing several signal processing techniques in order to identify the most accurate one.

show abstract

Wireless IC doppler radars for sensing of heart and respiration activity

Cited by 16 publications

References 20 publications

Low-cost differential front-end for Doppler radar vital sign monitoring

Low-cost differential front-end for Doppler radar vital sign monitoring

Noncontact heartbeat detection at 2.4, 5.8, and 60 GHz: A comparative study

A Tunable System for Contact-Less Heartbeat Detection and a Modeling Approach

Contact Info

Product

Resources

About