NDLI: Feasible space boundary search for improved optimisation-based miniaturisation of antenna structures

Content Provider	IET Digital Library
Author	Johanesson, David O. Koziel, Slawomir
Abstract	This study describes an enhanced procedure for electromagnetic-simulation-based miniaturisation of antenna structures. The proposed methodology utilises formulation of the antenna design as non-linear minimisation problem oriented towards explicit size reduction with constraints imposed on the reflection response of the structure at hand. The primary idea is to explore the boundary of the feasible region so as to allow efficient identification of a constrained optimum that ensures satisfaction of the prescribed matching requirements for the structure at hand. The proposed algorithm overcomes the issues related to the standard formulation involving a penalty function approach, where high non-linearity of the objective function in the vicinity of the optimum may lead to finding a sub-optimal design. For the sake of demonstration and verification, three examples of ultra-wideband antennas are considered. In all cases, the proposed methodology leads to smaller footprints and better control of the in-band matching compared to the benchmark algorithm, i.e. gradient-based search with implicit reflection response control through a penalty function approach.
Starting Page	1273
Ending Page	1278
Page Count	6
ISSN	17518725
Volume Number	12
e-ISSN	17518733
Issue Number	Issue 8, Jul (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/12/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2017.0644
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2018-01-31
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Design Formulation Antenna Structures Combinatorial Mathematics Electromagnetic-simulation-based Miniaturisation Explicit Size Reduction Feasible Space Boundary Search Gradient Method Gradient-based Search Implicit Reflection Response Control Improved Optimisation-based Miniaturisation In-band Matching Minimisation Nonlinear Minimisation Problem Nonlinear Programming Optimisation Technique Penalty Function Approach Prescribed Matching Requirements Reflection Response Search Problem Single Antenna Suboptimal Design Ultra Wideband Antenna Ultrawideband Antenna
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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