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Finite difference time domain analysis of microstrip antenna-circuit modules

Kalialakis, Christos (1999)
Ph.D. thesis, University of Birmingham.

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Abstract

Compact microstrip antenna-circuit modules, which could be used as front-ends for future wireless systems applications, require electromagnetic modelling due to the close interaction of the circuit with the antenna. Spectrum crowding and EMC/EMI issues call for modelling of the radiation of such modules. Coupling through fringing fields and the nonlinearities of active devices must be addressed. In this work, the FDTD method was used because it can provide the framework for inclusion of circuit elements in a full wave calculation. A software tool was developed and validated based on this method. The modules studied were chosen due to their compactness and their merit as system components. A module with simultaneous transmit-receive operation integrating an active circulator (using amplifiers in a ring-like arrangement) and a quarter wavelength antenna was analysed. Coupling effects were identified and their impact on the radiation patterns was shown. Electronically tuneable microstrip patch antennas using varactor diodes were also studied. Tuning range and harmonic radiation were demonstrated. Single and dual device Gunn oscillator antennas were analysed and their radiation patterns were calculated for the first time. All of our results were in agreement with experimental findings.

Type of Work:Ph.D. thesis.
Supervisor(s):Hall, Peter S. and Gardner, Peter
School/Faculty:Schools (1998 to 2008) > School of Engineering
Department:Electronic and Electrical Engineering
Keywords:FDTD, microstrips, active integrated antennas, computational electromagnetics
Subjects:TK Electrical engineering. Electronics Nuclear engineering
Institution:University of Birmingham
Library Catalogue:Check for printed version of this thesis
ID Code:65
This unpublished thesis/dissertation is copyright of the author and/or third parties.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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