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Microwave Imaging (microwave + imaging)

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Engineering71%

Selected Abstracts

Microwave imaging of parallel perfectly conducting cylinders

INTERNATIONAL JOURNAL OF IMAGING SYSTEMS AND TECHNOLOGY, Issue 6 2000
Anyong Qing
This paper considers microwave imaging of parallel perfectly conducting cylinders using a solution of the scattering problem by the point-matching method. A cubic B-spline, real-coded genetic algorithm and an adaptive hybrid algorithm are proposed to solve the inverse problem. Previous shape functions in trigonometric series with arbitrary coefficients are nondefinite, which intensify the ill-posedness and slow the early time convergence of the algorithm. A novel shape function based on cubic B-splines is developed and the real-coded genetic algorithm is modified accordingly. Numerical simulation examples show that the early time convergence of the real-coded genetic algorithm is improved significantly. Next, the adaptive hybrid algorithm is developed to improve the late time convergence of the cubic B-spline real-coded genetic algorithm. © 2001 John Wiley & Sons, Inc. Int J Imaging Syst Technol 11, 365,371, 2000 [source]

Microwave imaging from limited-angle scattered data using the iterative multiscaling approach

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2005
Massimo Conci
Abstract In this paper, with reference to limited-angle data configurations, the performance of the nonlinear multiscaling inversion approach (IMSA) is analyzed. Such an assessment is carried out by considering synthetically generated as well as laboratory-controlled experimental data ("Marseille data") concerning 2D dielectric scatterers. The obtained results demonstrate a satisfactory robustness and the reliability of the approach. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 358,363, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20634 [source]

Microwave imaging of parallel perfectly conducting cylinders

INTERNATIONAL JOURNAL OF IMAGING SYSTEMS AND TECHNOLOGY, Issue 6 2000
Anyong Qing
This paper considers microwave imaging of parallel perfectly conducting cylinders using a solution of the scattering problem by the point-matching method. A cubic B-spline, real-coded genetic algorithm and an adaptive hybrid algorithm are proposed to solve the inverse problem. Previous shape functions in trigonometric series with arbitrary coefficients are nondefinite, which intensify the ill-posedness and slow the early time convergence of the algorithm. A novel shape function based on cubic B-splines is developed and the real-coded genetic algorithm is modified accordingly. Numerical simulation examples show that the early time convergence of the real-coded genetic algorithm is improved significantly. Next, the adaptive hybrid algorithm is developed to improve the late time convergence of the cubic B-spline real-coded genetic algorithm. © 2001 John Wiley & Sons, Inc. Int J Imaging Syst Technol 11, 365,371, 2000 [source]

A neural-network-based model for 2D microwave imaging of cylinders

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2004
Kun-Chou Lee
Abstract In this article, a neural network with radial-basis functions (RBF-NN) is applied to microwave imaging of cylinders. Initially, the shape function of the target cylinder is expanded by a Fourier series. The RBF-NN is trained by some direct-scattering data sets and thus can predict the images of the target cylinders. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE 14, 398,403, 2004. [source]

TEM horn antenna for near-field microwave imaging

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2010
Mark A. Campbell
Abstract Antennas capable of sending and receiving ultra-wideband pulses are required for radar-based microwave breast imaging. This article describes a TEM horn antenna designed to operate over a 2,12 GHz band with specific radiated near-field characteristics. Simulations and experimental measurements are presented, including detection of objects representing tumors. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1164,1170, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25136 [source]

A pulsed confocal microwave technique for the detection of dielectric contrast of breast tissue

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2005
G. Bindu
Abstract Confocal microwave technology is explored as a screening tool to detect regions of dielectric contrast in breast tissue. When exposed to microwaves, malignant breast tissue exhibits electrical properties that are significantly different from that of healthy breast tissue. In vitro studies of normal and cancerous samples of breast tissue are performed using a prototype of confocal microwave imaging. Experimentally obtained time-domain results are substantiated by finite-difference time-domain (FDTD) analysis. Dielectric permittivities of the samples are estimated from the experimentally obtained time-domain results and are validated by subjecting the samples to dielectric studies using a cavity-perturbation technique. The results are compared with the dielectric parameters of in vitro breast tissue data available in literature. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 209,212, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21125 [source]