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Radio-over-fibre systems for body-centric communication measurements

Dusara, Sunny (2011)
M.Res. thesis, University of Birmingham.

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Body-centric wireless communication devices are continually required to be smaller, lighter and thinner, and consequently the PCB, components, battery and antenna must become smaller.

The conventional method for measuring an antenna’s performance requires an anechoic chamber coaxial cable measurement system. However, measuring the antenna’s radiation pattern becomes difficult when the relative size of the antenna is smaller than the coaxial cable. Furthermore the difficulty increases when the antenna is in close proximity to the body due to the effects of detuning causing low antenna efficiency. A coaxial cable system produces poor measurement repeatability due to moving cables. This produces variable loss and phase and undesired coupling.

To solve this problem, this thesis describes the design of a novel radio-over-fibre antenna measurement system for on-body channel path measurements. The fibre system is employed to replace coaxial cables with fibre optic cables between the antennas and network analyser at 2.45 Gigahertz for the belt-to-head channel. The simulations are compared to measurements taken in the anechoic chamber. The radio-over-fibre system appears to improve measurement accuracy through an observable improvement in mean forward path gain (S21) of 2.19 dB when compared with the coaxial system. This improvement is most desirable for repeatable on-body measurements.

Type of Work:M.Res. thesis.
Supervisor(s):Hall, Peter S.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Electronic, Electrical and Computer Engineering
Subjects:TK Electrical engineering. Electronics Nuclear engineering
Institution:University of Birmingham
ID Code:2848
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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