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

Autor: Peter S. Excell, Raed A. Abd-Alhameed, Nazar Ali, Arfan Ghani, Chan H. See, Quirino Balzano, Neil J. McEwan
Jazyk: angličtina
Rok vydání: 2017
Předmět:
cavity resonators
Culture and Communities
Internet of Things
621.38 Electronics & Communications engineering
02 engineering and technology
Optimisation and learning
01 natural sciences
Signal
harmonic generation
TK Electrical engineering. Electronics Nuclear engineering
Resonator
medical signal detection
0103 physical sciences
0202 electrical engineering
electronic engineering
information engineering
Electronic engineering
High harmonic generation
Demodulation
Electrical and Electronic Engineering
010302 applied physics
Physics
Sensors
Detector
biological techniques
020206 networking & telecommunications
Acoustics
calibration
demodulation
Atomic and Molecular Physics
and Optics
AI and Technologies
Harmonic
Radio frequency
biological tissues
table lookup
Sensitivity (electronics)
Smart cities
Engineering Research Group
ISSN: 1751-8830
Popis: 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.
Databáze: OpenAIRE
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