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Pubmed for Handhelds

PUBMED FOR HANDHELDS

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  • Title: On the design and assessment of a 2.45 GHz radio telecommand system for remote patient monitoring.
    Author: Crumley GC, Evans NE, Burns JB, Trouton TG.
    Journal: Med Eng Phys; 1998 Dec; 20(10):750-5. PubMed ID: 10223644.
    Abstract:
    This paper discusses the design and operational assessment of a minimum-power, 2.45 GHz portable pulse receiver and associated base transmitter comprising the interrogation link in a duplex, cross-band RF transponder designed for short-range, remote patient monitoring. A tangential receiver sensitivity of - 53 dBm was achieved using a 50 ohms microstrip stub-matched zero-bias diode detector and a CMOS baseband amplifier consuming 20 microA from + 3 V. The base transmitter generated an on-off keyed peak output of 0.5 W into 50 ohms. Both linear and right-hand circularly-polarised antennas were employed in system evaluations carried out within an operational Coronary Care Unit ward. For transmitting antenna heights of between 0.3 and 2.2 m above floor level. transponder interrogations were 95% reliable within the 82 m2 area of the ward, falling to an average of 46% in the surrounding rooms and corridors. Separating the polarisation modes, using the circular antenna set gave the higher overall reliability.
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