Wojciech Gwarek

Learn More
This paper presents a new type of an electromagnetic sensor for nondestructive testing of carbon-fiber-reinforced polymer composites. The sensor utilizes coupled planar spiral inductors operating typically in the range of 10-500 MHz. The method proposed here shows some similarity to the eddy current technique, but as will be shown, the principles of(More)
Split-post dielectric resonators were used for the measurement of the complex permittivity and the complex permeability of planar, uniaxialy anisotropic, low- and medium-loss metamaterials at microwave frequencies. Several metamaterials with different metal patterns deposited on dielectric substrates by plasma deposition were investigated, including(More)
Numerical solutions of coupled Maxwell and Landau-Lifshitz-Gilbert equations for a magnetized yttrium iron garnet (YIG) sphere acting as a one-stage filter are presented. The filter is analysed using finite-difference time-domain technique. Contrary to the state of the art, the study shows that the maximum electromagnetic power transmission through the YIG(More)
The objective of the paper is to provide a systematic consideration and generalization of properties and features of the FDTD method in the context of its use in solving microwave power problems. This is aimed at filling the gap between the general theory of the FDTD method and the specific practice of its applications by microwave power engineers. The(More)
A comprehensive study of a microwave applicator for thermal treatment of bituminous surface is presented in this paper. The applicator consists of a customized rectangular waveguide horn surrounded with a hexagonal lattice of cylindrical chokes preventing hazardous leakage of microwave radiation beyond an exposure area. Electromagnetic simulations based on(More)
Full-wave electromagnetic analysis by the finite-difference time-domain (FDTD) method is combined with the scalar diffraction method to obtain a numerical tool for optical lens imaging. The FDTD method is applied to the modeling of scattering phenomenon in the vicinity of a target. Afterward, obtained results are coupled with the Fresnel diffraction method(More)
A new model of microwave susceptors for FDTD simulations of electromagnetic heating phenomena is developed. Susceptors are thin metal coatings inside microwaveable food packages used to enhance the heating effects. Their modelling is crucial for accurate design of microwave ovens and food packages. It is shown that susceptors of typical parameters cannot be(More)
Application of the electromagnetic analysis by finite-difference time-domain (FDTD) method coupled with the scalar diffraction (SD) method for the electromagnetic (EM) modeling of optical microscope imaging is introduced. FDTD method is applied for the modeling of scattering from a 2D target - typically an IC structure with size of elements comparable to(More)
  • 1