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Item type:Publication, Access status: without files , Recent developments of via and return current path modelingThis paper reviews solutions for the modeling of vias in printed circuit boards. The focus is on two approaches: multiple scattering methods and equivalent circuit models. For each approach, the general concept is described, followed by examples of recently improved or newly developed implementations. The applicability to several kinds of via modeling tasks is summarized. Finally, a closer look is taken at the different ways of return current path modeling in the two approaches. The analysis also illustrates the frequency-dependent behavior of the return current.Publicationtype: Conference Paper20 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Investigation of field coupling into a carbon fiber aircraft fuselage with the method of momentsIn this paper the field coupling into a fuselage model consisting of carbon fiber composite with apertures is analyzed by means of the Method of Moments. A set of two boundary integral equations, involving two current layers, is applied for accurate treatment of aperture coupling. The considered anisotropic shell is investigated by two approaches, where the modeling is accomplished using boundary impedances and a multilayer technique, respectively. The applicability of these techniques is studied and validated by reference computations on generic test objects. It turns out that the results gained by the proposed techniques are in very good agreement with results of the finite element method.Publicationtype: Conference Paper13 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Miniaturized coaxial cylindrical cavity filters based on sub-wavelength metamaterial loaded resonator(IEEE, 2011); ; ; ; This paper presents analysis, design and simulation of a novel sub-wavelength metamaterial resonator and its application in designing miniaturized filters. The presented sub-wavelength resonator is a coaxial cylindrical cavity in which a combination of an ordinary dielectric material and a metamaterial layer has been inserted. The general dispersion relation for such a resonator is formulated. Using this general formula and considering the sub-wavelength scenario, the approximate dispersion relation is extracted. Based on this approximate dispersion relation and through the use of an anisotropic negative (MNG) layer, it is shown that this configuration may in principal exhibit an arbitrary low resonant frequency for a fixed dimension. In comparison with miniaturized rectangular cavities and also miniaturized one-dimensional resonators, the above mentioned resonator provides the possibility of selecting a distinct mode of operation and also a further degree of freedom in the approximate dispersion relation which brings more flexibility in designing miniaturized resonators. As an example design and simulation of a miniaturized coaxial cavity resonator together with the complete design of the anisotropic MNG layer are presented. The resultant cavity diameter is shortened by approximately 69% in comparison with theoretical minimum dimensions of a cylindrical cavity resonator of the same height. Finally based on the designed miniaturized resonator a miniaturized filter with the center frequency of 5.85GHz and the bandwidth of 20MHz is designed and simulated.Publicationtype: Conference Paper96 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Active learning method for designing miniaturized waveguide filters loaded by broadside-coupled split ring resonatorsThis paper focuses on the design and fabrication of miniaturized rectangular waveguide bandpass filters which are loaded by broadside-coupled split ring resonators. The conventional coupling matrix approach is proposed to design these kinds of filters. Also the time consuming process of coupling factor computation which is based on full wave simulations is replaced by a very fast and accurate fuzzy based method which is named active learning method (ALM). Therefore coupling factor computation time decreases to several minutes instead of several hours in the conventional approach while keeping accuracy. Using the ALM-based extracted coupling factor surfaces two Chebychev bandpass filters were designed and fabricated. A very good agreement between simulation and measurement results shows the accuracy of the proposed method.Publicationtype: Conference Paper2