NDLI: Localisation and permittivity extraction of an embedded cylinder using decomposition of the time reversal operator

Content Provider	IET Digital Library
Author	Omrani, Adel Moghadasi, Mahdi Dehmollaian, Mojtaba
Abstract	In this study, first, the problem of time reversal imaging of an embedded dielectric or metallic cylinder inside another dielectric cylinder is studied. The direct problem is carried out numerically using the finite-element method. The background dyadic Green function (DGF) is computed analytically by computing radiated fields of an infinitesimal electric dipole near an infinitely long dielectric cylinder. The time reversal technique is then applied using this background DGF to image the embedded cylinder. Results demonstrate that while using a free-space DGF for imaging yields erroneous results, by employing a proper background DGF, the scatterer inside the cylinder is correctly localised. Next, the authors extract permittivities in two different scenarios with two different techniques. In the first case, the permittivity of a background cylinder that contains a metallic cylinder inside it is extracted by calculating the image entropy. In the second case, the permittivity of an embedded cylinder inside a priori known background dielectric cylinder is estimated by a new method based on an optimisation and evaluation of the largest eigenvalues of the multistatic data matrices. The proposed techniques are then verified using simulated and measured data. For measurements, a newly developed combined tapered sectorial antenna is designed, fabricated, and characterised.
Starting Page	851
Ending Page	859
Page Count	9
ISSN	17518725
Volume Number	14
e-ISSN	17518733
Issue Number	Issue 9, Jul (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/14/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2018.5731
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2020-02-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Background Cylinder Background DGF Background Dielectric Cylinder Background Dyadic Green Function Decomposition Eigen Values Eigen Values And Eigen Function Electromagnetic Wave Electromagnetic Wave Scattering Embedded Dielectric Cylinder Entropy Finite Element Analysis Finite Element Method Free-Space DGF Green's Function Image Entropy Infinitesimal Electric Dipole Matrix Algebra Metallic Cylinder Multistatic Data Matrix Optimisation Permittivity Extraction Photonic Technology Radiated Field Scatterer Single Antenna Tapered Sectorial Antenna Time Reversal Imaging Time Reversal Operator
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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