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Dive into the research topics where Dragan Krupezevic is active.

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Featured researches published by Dragan Krupezevic.


IEEE Transactions on Microwave Theory and Techniques | 1993

The wave-equation FD-TD method for the efficient eigenvalue analysis and S-matrix computation of waveguide structures

Dragan Krupezevic; V.J. Brankovic; F. Arndt

A modified finite-difference-time-domain (FDTD) formulation based on the direct discretization of the vector wave-equation is applied to the efficient analysis of hybrid-mode waveguiding structures. For both 3-D and 2-D waveguide eigenvalue problems, the formulation requires only one grid, and just the solution of three coupled equations is necessary. Numerical examples concerning the resonant frequencies for an inhomogeneously filled waveguide resonator as well as the fundamental- and higher-order-mode propagation factors for insulated image guides, shielded coupled dielectric guides, and lateral open dielectric ridge guides demonstrate the efficiency of the method. The theory is verified by comparison with results obtained by other methods. >


IEEE Transactions on Microwave Theory and Techniques | 1992

An efficient two-dimensional graded mesh finite-difference time-domain algorithm for shielded or open waveguide structures

V.J. Brankovic; Dragan Krupezevic; F. Arndt

A finite-difference-time-domain (FDTD) algorithm for the efficient full-wave analysis of a comprehensive class of millimeter-wave and optical waveguide structures is described. The algorithm is based on a two-dimensional graded mesh combined with adequately formulated absorbing boundary conditions. This allows the inclusion of nearly arbitrarily shaped, fully or partially lateral open or shielded guiding structures with or without layers of finite metallization thickness. Moreover, lossy dielectrics and/or lossy conductors are included in the theory. The algorithm leads to a significant reduction in CPU time and storage requirements as compared with the conventional three-dimensional eigenvalue FDTD mesh formulation. Dispersion characteristic examples are calculated for structures suitable for usual integrated circuits, such as insulated image guides, ridge guides, dielectric waveguides, trapped image guides, coplanar-lines and microstrip lines. The theory is verified by comparison with results obtained by other methods. >


international microwave symposium | 1992

An improved FD-TD full wave analysis for arbitrary guiding structures using a two-dimensional mesh

F. Arndt; Veselin J. Brankovic; Dragan Krupezevic

A novel finite-difference time-domain (FD-TD) formulation is proposed for the efficient analysis of arbitrary waveguiding structures. In contrast to the conventional FD-TD eigenvalue formulation, which requires a three-dimensional mesh for adequately formed resonator sections, this method utilizes advantageously a two-dimensional mesh for analyzing the full-wave dispersive characteristic of guided structures. This leads to a significant reduction in CPU time and storage requirements. Numerical examples are presented for bi- and unilateral finlines with finite metallization thickness and for a pair of coupled shielded dielectric guides. The theory is verified by comparison with results obtained by other methods.<<ETX>>


international microwave symposium | 1995

A wide-band S-parameter extraction procedure for arbitarily shaped, inhomogeneous structures using time domain numerical techniques

Jan Ritter; V.J. Brankovic; Dragan Krupezevic; F. Arndt

A new, simple and very efficient technique for the wide-band extraction of scattering parameters using time domain methods (e.g. FDTD, TLM) is introduced which avoids the hitherto necessary high requirements for appropriate absorbing boundary conditions. The technique is based on the modal S-parameter definition for unmatched ports and achieves, even with standard non-dispersive Murs absorbing boundaries, excellent and reliable results also for dispersive microwave structures and inhomogeneous input and output ports. The proposed method is verified by excellent agreement with measurements or with mode-matching results.<<ETX>>


international microwave symposium | 1993

Efficient full-wave 3D and 2D waveguide eigenvalue analysis by using the direct FD-TD wave equation formulation

V.J. Braknovic; Dragan Krupezevic; F. Arndt

A modified finite-difference time-domain (FD-TD) formulation based on the direct discretization of the vector wave-equation is applied to the efficient analysis of hybrid-mode waveguiding structures. For both 3D and 2D waveguide eigenvalue problems, the FD-TD wave-equation formulation requires only one grid, and just the solution of three coupled equations is necessary. Numerical examples concerning the resonance frequencies for an inhomogeneously filled waveguide resonator as well as the fundamental- and higher-order mode propagation factors for insulated image guides, shielded coupled dielectric guides, and lateral open dielectric ridge guides demonstrate the efficiency of the method. The theory is verified by comparison with results obtained by other methods.<<ETX>>


international microwave symposium | 1993

A simplified 2D graded mesh FD-TD algorithm for calculating the characteristic impedance of shielded or open planar waveguides with finite metallization thickness

Dragan Krupezevic; V.J. Brankovic; F. Arndt

A full-wave finite-difference time-domain (FD-TD) algorithm for the efficient calculation of the characteristic impedance of planar waveguiding structures including the finite metallization thickness is described. The FD-TD algorithm is based on a 2D graded mesh combined with adequately formulated absorbing boundary conditions. This allows the inclusion of nearly arbitrarily shaped, fully or partially lateral open or shielded guiding structures with layers of finite metallization thickness. Using a modified formulation, an actual 2D grid for 2D problems is obtained, i.e., the grid size for these problems is zero in the z-direction as long as the waveguide is homogeneous in that direction. The characteristic impedances are calculated by using the related adequate power-voltage or power-current definitions, for structures suitable for the usual types of integrated circuits, such as bilateral finlines, open microstrip lines, lateral open triplate lines, open slotlines, and open coplanar lines.<<ETX>>


european microwave conference | 2001

60 GHz Wireless Access System Concept

Veselin Brankovic; Kenichi Kawasaki; Kazuji Sasaki; Keiji Fukuzawa; Yasuhiro Okada; Dragan Krupezevic; Mohamed Ratni; Hamid Alikhani

Data rate demand for wireless systems due to variety of applications is permanently growing. Recently, 60 GHz band is worldwide allocated as a possible band for ultrabroadband applications. In this paper basic scenarios for outdoor, underground and large hall type of environments are proposed, together with technology requirements and specific technology solutions. In contrast to the clear indoor applications, the new additional approach opens new applications within public download capabilities, and high data rate communication in GigaBit/s area. The basic ideas for the new arts of the business model where connectivity is free of charge are outlined.


international microwave symposium | 1994

Efficient 2D FD-TD method for the rigorous analysis of arbitrarily shaped guided wave structures on general electrically and magnetically anisotropic substrates

V.J. Brankovic; Dragan Krupezevic; Jan Ritter; F. Arndt

A new full wave two-dimensional finite difference time domain (2D FD-TD) algorithm is presented for the rigorous calculation of the dispersion characteristics and characteristic impedance of arbitrarily shaped guided wave structures on anisotropic substrates with full permittivity and permeability tensors. The theory is verified by comparison of results obtained by the Spectral Domain method for an open microstrip line printed on an anisotropic material where the permittivity and permeability tensors are rotated simultaneously. The second example is a ferrite loaded waveguide where analytical results are available. Excellent agreement between the FD-TD and the reference results is obtained.<<ETX>>


european microwave conference | 1999

24 to 5 GHz Up/Down Converters with Integrated Antennas

Aleksandar Nesic; Veselin Brankovic; Dragan Krupezevic; Ivana Radnovic

Within the research efforts toward new generation of in-door communcation systems, utilization of frequencies in higher microwave and lower MM-wave bands may play an important role in future. One of the barriers for fast market introduction are also convenient inherently low cost RE Front ends which have to be realized in planar technology, moreover with integrated antennas. In this paper, solutions for up/down converters with integrated antennas in 24 GHz (ISM band) to 5 GHz (Non Licensed / HIPERLAN Band) are presented. The results may also trace work on the future 60 GHz systems. Two solutions with sector and high gain antenna are successfufly implemented and described in more details. Measured results have proved the proposed concept.


Archive | 2001

Indoor wireless system using active reflector

Gerald Oberschmidt; Veselin Brankovic; Dragan Krupezevic; Tino Puch; Thomas Dölle

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F. Arndt

University of Bremen

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