The design and performance of a 2.5-GHz telecommand link for wireless biomedical monitoring

G.C. Crumley, N.E. Evans, William Scanlon, J.B. Burns, T.G. Trouton

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


This paper details the implementation and operational performance of a minimum-power 2.45-GHz pulse receiver and a companion on-off keyed transmitter for use in a semi-active duplex RF biomedical transponder. A 50-Ohm microstrip stub-matched zero-bias diode detector forms the heart of a body-worn receiver that has a CMOS baseband amplifier consuming 20 microamps from +3 V and achieves a tangential sensitivity of -53 dBm. The base transmitter generates 0.5 W of peak RF output power into 50 Ohms. Both linear and right-hand circularly polarized Tx-Rx antenna sets were employed in system reliability trials carried out in a hospital Coronary Care Unit, For transmitting antenna heights between 0.3 and 2.2 m above floor level, transponder interrogations were 95% reliable within the 67-m-sq area of the ward, falling to an average of 46 % in the surrounding rooms and corridors. Overall, the circular antenna set gave the higher reliability and lower propagation power decay index.
Original languageEnglish
Pages (from-to)285-291
Number of pages7
JournalIEEE Transactions on Information Technology in Biomedicine
Volume4 (4)
Issue number4
Publication statusPublished - Dec 2000

ASJC Scopus subject areas

  • Computational Theory and Mathematics
  • Computer Science Applications
  • Information Systems
  • Health Informatics
  • Health Information Management


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