Mathematical Model for Calibration of Potential Detection of Nonlinear Responses in Biological Media Exposed to RF Energy

作者

  • C. H. See 1 School of Engineering University of Bolton, Bolton, BL3 5AB, UK , 2 School of Electrical Engineering & Computer Science University of Bradford, Bradford, BD7 1DP, UK
  • R. A. Abd-Alhameed School of Electrical Engineering & Computer Science University of Bradford, Bradford, BD7 1DP, UK
  • A. F. Mirza School of Electrical Engineering & Computer Science University of Bradford, Bradford, BD7 1DP, UK
  • N. J. McEwan 2 School of Electrical Engineering & Computer Science University of Bradford, Bradford, BD7 1DP, UK,, 3 Division of Applied Science, Computing and Engineering Glyndwr University, Wrexham, LL11 2AW, UK
  • P. S. Excell School of Electrical Engineering & Computer Science University of Bradford, Bradford, BD7 1DP, UK,Division of Applied Science, Computing and Engineering Glyndwr University, Wrexham, LL11 2AW, UK
  • Q. Balzano Department of Electronic and Computer Engineering University of Maryland, College Park, MD, USA

关键词:

Biological responses, nonlinearity, quality factor, resonant cavity, second harmonic

摘要

An efficient way to test for potential unsymmetrical nonlinear responses in biological tissue samples exposed to a microwave signal is to observe the second harmonic in a cavity resonant at the two frequencies, with collocated antinodes. Such a response would be of interest as being a mechanism that could enable demodulation of information-carrying waveforms. In this work, an electric circuit model is proposed to facilitate calibration of any putative nonlinear RF energy conversion inside a high quality-factor resonant cavity with a known nonlinear loading device. The first and second harmonic responses of the cavity due to loading with the nonlinear and lossy material are also demonstrated. The results from the proposed mathematical model give a good indication of the input power required to detect any very weak second harmonic signal in relation to the sensitivity of the measurement equipment. Hence, this proposed mathematical model will assist in determining the level of the second harmonic signal in the detector as a function of the specific input power applied.

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参考

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已出版

2021-08-08

栏目

General Submission