Pole estimation for arbitrarily-shaped dielectric targets using genetic algorithm-based resonance annihilation technique

The use of a genetic algorithm-based resonance annihilation technique to extract the interior poles of an arbitrarily shaped dielectric object with the ultimate purpose of target identification is proposed. The technique is demonstrated for a dielectric sphere with a very good agreement between the exact and extracted pole values.


Zigzag metallic conductors as frequency selective surfaces
DELİHACIOĞLU, KEMAL; Sabah, Cumali; KARAASLAN, MUHARREM; ÜNAL, EMİN (Institution of Engineering and Technology (IET), 2013-06-18)
Reflection and transmission properties of a new type of frequency selective surface (FSS) made of zigzag metallic elements placed periodically on a dielectric substrate are investigated theoretically for arbitrary polarisation. The electric field integral equation technique with the subdomain overlapping piecewise sinusoidal basis functions are employed to compute the unknown current coefficients induced on the metallic elements. The zigzag FSS arrays act as a low-pass filter in S-(1-5 GHz), X-(8-12 GHz) an...
Use of Asymptotic Waveform Evaluation Technique in the Analysis of Multilayer Structures With Doubly Periodic Dielectric Gratings
Gudu, Tamer; Alatan, Lale (Institute of Electrical and Electronics Engineers (IEEE), 2009-09-01)
The reflection and dispersion characteristics of multilayer structures that involve periodically implanted material blocks are obtained by using the MoM solution of the volume integral equation. The asymptotic waveform evaluation (AWE) technique is utilized to obtain a Pade approximation of the solution in terms of a parameter such as frequency or incident angle. The use of AWE technique enables a fast sweep with respect to the approximation parameter. Moreover, a robust method for extracting the dispersion...
Stabilization of integral-equation formulations for the accurate solution of scattering problems involving low-contrast dielectric objects
Ergül, Özgür Salih (Institute of Electrical and Electronics Engineers (IEEE), 2008-03-01)
The solution of scattering problems involving low-contrast dielectric objects with three-dimensional arbitrary shapes is considered. Using the traditional forms of the surface integral equations, scattered fields cannot be calculated accurately if the contrast of the object is low. Therefore, we consider the stabilization of the formulations by extracting the nonradiating parts of the equivalent currents. We also investigate various types of stable formulations and show that accuracy can be improved systema...
Array guided surface waves on a finite planar array of dipoles with or without a grounded substrate
Aydın Çivi, Hatice Özlem (Institute of Electrical and Electronics Engineers (IEEE), 2006-08-01)
The existence of array guided surface waves (AGSWs) on partially finite (finite x infinite) array of dipoles in air have been demonstrated earlier; the work in this paper extends this study to fully finite (finite x finite) planar arrays both in air and on a grounded material slab of infinite extent. Effects of AGSWs on scattering characteristics are examined and a ray interpretation is provided for the edge/corner excitation of AGSWs and conventional substrate surface waves.
U-shaped frequency selective surfaces for single- and dual-band applications together with absorber and sensor configurations
Bakir, Mehmet; DELİHACIOĞLU, KEMAL; KARAASLAN, MUHARREM; Dincer, Furkan; Sabah, Cumali (Institution of Engineering and Technology (IET), 2016-02-19)
In this study, the frequency selective surface (FSS), absorbance and sensing applications of new unit cells comprised of single, double and quad U-shaped metallic elements are numerically and experimentally investigated. The numerical results are realised by using finite integration technique-based electromagnetic simulation software, CST Microwave Studio. Experimental results are obtained by means of Agilent N5234A PNA-L vector network analyser. The simulated and measured results of U-shaped FSSs are carri...
Citation Formats
G. Sayan and M. Kuzuoğlu, “Pole estimation for arbitrarily-shaped dielectric targets using genetic algorithm-based resonance annihilation technique,” ELECTRONICS LETTERS, pp. 380–381, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38065.