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Variable Z0 applied to the optimal design of multi-stub matching network and a meander monopole

Published online by Cambridge University Press:  13 December 2013

Nihad Dib ,
Ashraf Sharaqa  and
Richard A. Formato
Nihad Dib*
Affiliation:
Electrical Engineering Department, Jordan University of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan
Ashraf Sharaqa
Affiliation:
Communication and Security Projects Division, WorleyParsons Arabia Ltd., P. O. Box 31699, Al-Khobar 31952, Saudi Arabia
Richard A. Formato
Affiliation:
Consulting Engineer and Patent Attorney, P.O. Box 1714, Harwich, MA 02645, USA
*
Corresponding author: N. Dib Email: nihad@just.edu.jo
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Abstract

Variable Z0, a new concept in antenna design and optimization, is applied to two optimization problems: a multi-stub matching network (MSMN) using biogeography-based optimization (BBO), and an ultra wideband meander monopole antenna (MMA) using central force optimization (CFO). BBO is a newly-proposed stochastic global search and optimization evolutionary algorithm (EA) used to determine MSMN stub lengths and locations for optimum (minimum) reflection coefficient. CFO is a deterministic EA used to optimize the MMA's impedance bandwidth (IBW) while maintaining good average gain without considering the radiation pattern in detail. Two cases are investigated for both problems: (a) fixed characteristic impedance Z0, and (b) variable characteristic impedance. In the first case, Z0 is a fixed user-specified parameter (the traditional methodology), whereas in the second, it is a true variable quantity whose value is determined by the optimization methodology, which is a new technology. Variable Z0 is a fundamentally different design approach in optimization problems. BBO's fixed Z0 results for MSMN are compared to published data computed using Nelder–Mead optimization with BBO exhibiting better performance. BBO's results are improved even more using Variable Z0 technology. A similar performance improvement is seen for Variable Z0 applied to the CFO-optimized MMA.

Keywords

Variable Z0Matching networksMonopole antennaOptimizationBiogeography-based optimizationCentral force optimization
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 6 , Issue 5: MEMSWAVE Symposium 2013 , October 2014 , pp. 505 - 514
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2013 

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