Reflection of Coherent Millimeter-Wave Wavelets on Dispersive Materials: A Study on Porcine Skin

Sebastian Heunisch, Lars Ohlsson, Lars Erik Wernersson

Research output: Contribution to journalArticlepeer-review

5 Citations (SciVal)

Abstract

Differences in the material reflection are required for any contrast in microwave- and millimeter-wave (mm-wave) imaging systems. Therefore, the dielectric properties, which determine the reflection of materials, need to be characterized. The characterization of skin and other biological tissue is, therefore, necessary, to apply imaging systems for instance in cancer diagnosis. In this paper, short, coherent mm-wave pulses (wavelets) are generated and their reflection on dispersive materials is studied. The reflections of wavelets on porcine skin and water are examined in time and frequency domain. A first-order Debye model is fitted to the reflection coefficient in frequency domain to quantify material dispersion. The frequency-dependent reflection on dispersive materials causes a distortion of the wavelets in the time domain. The startup behavior of the pulses is examined by simulation and measurements. The rise time of the pulses is identified as a feature in time domain for wavelets reflected on dispersive media. Together with other features characteristic for a pulse, for instance the wavelet amplitude, this enables identification of dispersive materials by reflectometry measurements, making it suitable for applications in mm-wave imaging systems.

Original languageEnglish
Pages (from-to)2047-2054
JournalIEEE Transactions on Microwave Theory and Techniques
Volume66
Issue number4
Early online date2018 Feb 20
DOIs
Publication statusPublished - 2018

Subject classification (UKÄ)

  • Signal Processing
  • Nano Technology

Keywords

  • Antenna measurements
  • Biomedical applications
  • Debye model
  • Dispersion
  • dispersive materials
  • ex vivo tissues
  • Frequency-domain analysis
  • Imaging
  • Metals
  • microwave imaging
  • Microwave theory and techniques
  • millimeter waves (mm waves)
  • permittivity measurement
  • reflectometry
  • rise time
  • Slabs
  • time-domain analysis

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