Design of axial-mode helical antennas for Doppler-based continuous non-contact vital signs monitoring sensors

Alex Boothby, Royce Hwang, Vighneshrudra Das, Jerry Lopez, Donald Y.C. Lie

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

12 Scopus citations

Abstract

An Axial-Mode Helical Antenna (AMHA) design for applications in Doppler-based continuous non-contact vital signs (NCVS) monitoring sensor systems is presented. Two methodologies of on-reflector impedance matching are presented as a solution to the helical antennas' non-50 input impedance issue. The antennas are evaluated on their performance of VSWR, impedance, radiation pattern directivity, size and gain. A size reduction design process is given for custom sizing the helical antenna, and the resulting structures are compared versus a patch antenna at 2.4GHz that is often used in NCVS systems. Our test data indicates that an AMHA can significantly increase accuracy of NCVS systems by increasing the system's Signal-to-Noise-and-Interference Ratio (SNIR).

Original languageEnglish
Title of host publicationRWW 2012 - Proceedings
Subtitle of host publicationIEEE Radio and Wireless Symposium, RWS 2012
Pages87-90
Number of pages4
DOIs
StatePublished - 2012
Event2012 6th IEEE Radio and Wireless Week, RWW 2012 - 2012 IEEE Radio and Wireless Symposium, RWS 2012 - Santa Clara, CA, United States
Duration: Jan 15 2012Jan 18 2012

Publication series

NameRWW 2012 - Proceedings: IEEE Radio and Wireless Symposium, RWS 2012

Conference

Conference2012 6th IEEE Radio and Wireless Week, RWW 2012 - 2012 IEEE Radio and Wireless Symposium, RWS 2012
Country/TerritoryUnited States
CitySanta Clara, CA
Period01/15/1201/18/12

Keywords

  • Antennas
  • Biomedical telemetry
  • Directive antennas
  • Doppler radar
  • Helical antennas
  • Impedance matching
  • Vital signs detection

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