Regular Article

Optimization of multilayer cylindrical cloaks using genetic algorithms and NEWUOA

Engineering Mathematics and Physics Department, Faculty of Engineering, Cairo University, 12211 Giza, Egypt

^a e-mail: abdelmag@msn.com

Received: 14 February 2016
Revised: 26 March 2016
Accepted: 4 April 2016
Published online: 3 June 2016

Abstract

The problem of minimizing the scattering from a multilayer cylindrical cloak is studied. Both TM and TE polarizations are considered. A two-stage optimization procedure using genetic algorithms and NEWUOA (new unconstrained optimization algorithm) is adopted for realizing the cloak using homogeneous isotropic layers. The layers are arranged such that they follow a repeated pattern of alternating DPS and DNG materials. The results show that a good level of invisibility can be realized using a reasonable number of layers. Maintaining the cloak performance over a finite range of frequencies without sacrificing the level of invisibility is achieved.