Orthogonal-coil RF probe for implantable passive sensors

IEEE Transactions on Bio-medical Engineering
James R TalmanShuvo Roy

Abstract

A versatile orthogonal-coil radio frequency (RF) probe suitable for detecting the resonant frequency of miniature implantable passive sensors has been designed and tested. The probe sensitivity has been tested using printed-circuit spiral inductors of various sizes (3-15 mm) in series with discrete surface-mount capacitors designed to resonate over a range of frequencies (50-200 MHz). Close agreement between theoretical calculations and experimental results has been obtained. An equation is derived for transmit/receive (T/R) isolation that agrees with experimental measurements over the frequency range 1-500 MHz. The probe includes an additional coil to compensate for the effect of eddy currents in the human body on the probe. T/R isolation of at least 90 dB over the frequency range 1-100 MHz can be achieved when the probe is placed in close proximity to the human body.

References

Apr 1, 1970·Postgraduate Medical Journal·I R Mackay
Apr 1, 1967·IEEE Transactions on Bio-medical Engineering·C C Collins
Jan 1, 1988·IEEE Transactions on Medical Imaging·M A MorichF D Goldie

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Citations

Dec 16, 2006·Blood Purification·W H FissellS Roy

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