Improved trust-region gradient-search algorithm for accelerated optimization of wideband antenna input characteristics

Slawomir Koziel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Full-wave electromagnetic (EM) simulation models are ubiquitous in carrying out design closure of antenna structures. Yet, EM-based design is expensive due to a large number of analyses necessary to yield an optimized design. Computational savings can be achieved using, for example, adjoint sensitivities, surrogate-assisted procedures, design space dimensionality reduction, or similar sophisticated means. In this article, a simple modification of a rudimentary trust-region-embedded gradient search with numerical derivatives is proposed for reduced-cost optimization of input characteristics of wideband antennas. The approach exploits information and history of relative changes of the design (as compared with the trust region size) during algorithm iterations to control the updates of components of the antenna response Jacobian, specifically, to execute them only if necessary. It is demonstrated that the proposed framework may lead to over 50% savings over the reference algorithm with only minor degradation of the design quality, specifically, up to 0.3 dB (or <3%). Numerical results are supported by experimental validation of the optimized antenna designs. The presented algorithm can be utilized as a stand-alone optimization routine or as a building block of surrogate-assisted procedures.

Original languageEnglish
Article numbere21576
JournalInternational Journal of RF and Microwave Computer-Aided Engineering
Volume29
Issue number4
DOIs
Publication statusPublished - Apr 2019

Bibliographical note

Funding Information:
The author would like to thank Dassault Systemes, France, for making CST Microwave Studio available. This work is partially supported by the Icelandic Centre for Research (RANNIS) Grant 174114051 and by National Science Centre of Poland Grant 2015/17/B/ST6/01857.

Funding Information:
information: National Science Centre of Poland, Grant/Award Number: 2015/17/B/ST6/01857; Icelandic Centre for Research, Grant/Award Number: 174114051The author would like to thank Dassault Systemes, France, for making CST Microwave Studio available. This work is partially supported by the Icelandic Centre for Research (RANNIS) Grant 174114051 and by National Science Centre of Poland Grant 2015/17/B/ST6/01857.

Publisher Copyright:
© 2018 Wiley Periodicals, Inc.

Other keywords

  • antenna optimization
  • EM-driven design
  • gradient-based search
  • input characteristics
  • trust-region framework
  • wideband antennas

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