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A new efficient and proper modeling of isotropic/uniaxial anisotropic substrate specifications in design procedures of metasurfaces

Published online by Cambridge University Press:  14 November 2016

Sara Moinzad ,
Ali Abdolali  and
Bagher Noorbakhsh
Sara Moinzad*
Affiliation:
Applied Electromagnetics Laboratory, Iran University of Science and Technology (IUST), Narmak, Tehran 1684613114, Iran
Ali Abdolali
Affiliation:
Applied Electromagnetics Laboratory, Iran University of Science and Technology (IUST), Narmak, Tehran 1684613114, Iran
Bagher Noorbakhsh
Affiliation:
Faculty of Electrical Engineering, K. N. Toosi University of Technology, Tehran, Iran
*
Corresponding author: S. Moinzad Email: smoinzad@elec.iust.ac.ir
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Abstract

Specifications of the substrates are among the most important and problematic parameters that still do not have proper models in the design procedures of metasurfaces. In this paper, a new fast and exact algorithm based on artificial neural networks (ANNs) is presented, which makes it possible to design frequency-selective surfaces (FSSs) on various kinds of standard substrates. Also for the first time, designing FSSs on uniaxial anisotropic substrates can be easily done in short time and without any optimization algorithms. During this paper, first equivalent geometry approach (EGA) is demonstrated as a new method of preparation the ANNs. Then EGA is used to train geometry transformation ANNs. The advantage of this approach is to reduce the size of training datasets by about 98% and prevent from superfluous simulations. Hence, the time needed for training of the networks is much less than before. Numerical results are used to show that the required time for developing FSSs is <200 ms on average, and errors are <2%. For the final validation, a prototype sample of FSS is fabricated on the RO4003 substrate with 20 mil thickness. Both analytical and experimental results confirm the correctness of the predicted values.

Keywords

Frequency selective surfacesArtificial neural networksUniaxial substratesPeriodic substratesLiquid crystal substrates
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 5 , June 2017 , pp. 1045 - 1057
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2016 

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