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Polarization behaviour of on-body communication channels at 2.45 GHz

By Lida Akhoondzadehasl

Abstract

The advent of body worn devices and the use of them for a wide range of applications, from entertainment to military purposes, indicate the need to investigate to the behaviour of antennas and wave propagation on the body in depth. Knowledge and understanding and of the on-body channel can lead to the design of efficient antennas and systems for wearable devices. The objective of this work is to identify the propagation mechanism on the body for different polarisation states at 2.45 GHz. In particular, the effect of the body on the antenna performance with normal and parallel polarisation is studied and their capability in launching surface waves is evaluated. It is shown that both vertically and horizontally polarised antennas can launch a transverse magnetic (TM) Norton surface wave mode regardless of their polarisation states. However, horizontally polarised antennas do not launch the wave as strongly as vertically polarised antennas. Also, the change in the far field and near field behaviour of the antennas such as a dipole in proximity to the body is investigated and the observations lead to the design of a novel surface wave parasitic array. This new antenna is directive and can increase the path gain by almost 10 dB compared to other planar antennas. In addition, the effect of the polarization of the antenna on channel path gain is studied and channel cross polarization discrimination is quantified, using both simulation and measurement

Topics: TK Electrical engineering. Electronics Nuclear engineering
Year: 2011
OAI identifier: oai:etheses.bham.ac.uk:1563

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Citations

  1. (2006). Antennas and propagation for body-centric wireless communications. London: Artech House, doi
  2. (2007). Antennas and Radio Propagation for Body-centric Wireless Networks," doi
  3. (2003). Characterisation of body-shadowing effects in the indoor environment at 5.2 GHz," in High Frequency Postgraduate Student Colloquium,
  4. (2009). Characterization and modeling of on-body spatial diversity within indoor environments at 868 MHz," doi
  5. (2005). Comparison between two different antennas for UWB on-body propagation measurements," doi
  6. (1999). Ergonomics of wearable computers," doi
  7. (2005). Performance of antennas in the on-body environment,"
  8. (2008). Understanding on-body fading channels at 2.45 GHz using measurements based on user state and environment,"
  9. (2006). UWB on-body radio propagation and system modelling for wireless body-centric networks," doi
  10. (2009). Wireless body area network combined with satellite communication for remote medical and healthcare applications," doi

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