Calibration model for detection of potential demodulating behaviour in biological media exposed to RF energy

Potential demodulating ability in biological tissue exposed to radio-frequency (RF) signals intrinsically requires an unsymmetrical diode-like non-linear response in tissue samples. This may be investigated by observing possible generation of the second harmonic in a cavity resonator designed to hav...

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Bibliographic Details
Published in:IET science, measurement & technology Vol. 11; no. 7; pp. 900 - 906
Main Authors: See, Chan H, Abd-Alhameed, Raed A, Ghani, Arfan, Ali, Nazar T, Excell, Peter S, McEwan, Neil J, Balzano, Quirino
Format: Journal Article
Language:English
Published: The Institution of Engineering and Technology 01.10.2017
Subjects:
antinode collocation
biological techniques
biological tissue sample
biological tissues
calibration
calibration model
cavity resonator
cavity resonators
cellular processing
demodulation
electric circuit model
harmonic generation
harmonic resonant frequency
information‐carrying waveform
lookup table
lossy material
medical signal detection
nonlinear test‐piece
potential demodulating behaviour detection
putative nonlinear RF energy conversion
radiofrequency signal
reflection coefficient
Research Article
RF signal
second harmonic signal detection
table lookup
unsymmetrical diode‐like nonlinear response
biological tissue sample
harmonic generation
harmonic resonant frequency
table lookup
calibration model
second harmonic signal detection
reflection coefficient
lossy material
potential demodulating behaviour detection
electric circuit model
biological techniques
calibration
cavity resonators
antinode collocation
radiofrequency signal
unsymmetrical diode-like nonlinear response
cavity resonator
biological tissues
demodulation
putative nonlinear RF energy conversion
medical signal detection
RF signal
lookup table
cellular processing
information-carrying waveform
nonlinear test-piece
ISSN:1751-8822, 1751-8830
Online Access:Get full text
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Summary:Potential demodulating ability in biological tissue exposed to radio-frequency (RF) signals intrinsically requires an unsymmetrical diode-like non-linear response in tissue samples. This may be investigated by observing possible generation of the second harmonic in a cavity resonator designed to have fundamental and second harmonic resonant frequencies with collocated antinodes. Such a response would be of interest as being a mechanism that could enable demodulation of information-carrying waveforms having modulating frequencies in ranges that could interfere with cellular processes. Previous studies have developed an experimental system to test for such responses: the present study reports a circuit model to facilitate calibration of any non-linear RF energy conversion occurring within a test-piece inside the cavity. The method is validated computationally and experimentally using a well-characterised non-linear device. The proposed model demonstrates that the sensitivity of the measurement equipment plays a vital role in deciding the required input power to detect any second harmonic signal, which is expected to be very weak. The model developed here provides a lookup table giving the level of the second harmonic signal in the detector as a function of the input power applied in a measurement. Experimental results are in good agreement with the simulated results.
ISSN:1751-8822
1751-8830
DOI:10.1049/iet-smt.2017.0105