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Dive into the research topics where I. Stevanovic is active.

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Featured researches published by I. Stevanovic.


IEEE Transactions on Microwave Theory and Techniques | 2006

Integral-Equation Analysis of 3-D Metallic Objects Arranged in 2-D Lattices Using the Ewald Transformation

I. Stevanovic; Pedro Crespo-Valero; Katarina Blagovic; Frédéric Bongard; Juan R. Mosig

We present a space-domain integral-equation method for the analysis of periodic structures formed by three-dimensional (3-D) metallic objects arranged in a general skewed two-dimensional lattice. The computation of the space-domain Greens function is accelerated using the Ewald transformation. The method is validated on several periodic structures ranging from planar frequency-selective surfaces to 3-D photonic crystals and metamaterials. For these structures, our technique shows a clear advantage in terms of computational speed when compared with available commercial softwares


IEEE Design & Test of Computers | 2010

Extensions to Backward Propagation of Variance for Statistical Modeling

Colin C. McAndrew; I. Stevanovic; Xin Li; G. Gildenblat

Correlating the statistics of process parameters with the statistics of electrical performance is a vital task in statistical modeling. This article describes a more general form of the backward propagation of variance (BPV) method, a numerical technique for iteratively solving the statistics of process parameters from the statistics of electrical performance within the behavior of models encapsulated in Spice.


mediterranean electrotechnical conference | 2006

Analysis of Multilayer Boxed Printed Circuits

P. Crespo-Valero; Michael Mattes; I. Stevanovic; J. R. Mosig

This paper presents an efficient integral equation (IE) formulation based on the method of moments (MoM) for analysis of packaged printed circuits embedded within a multilayered medium. The approach uses a robust algorithm for computing the parameters of equivalent transmission lines, the analytic integration of MoM reaction terms, and the acceleration technique based on the extraction of quasi-static part. The algorithms are implemented in the simulation tool MAMBO (simulation of arbitrary multilayer boxed printed circuits). The simulation results of several packaged multilayered circuits show good agreement with the results obtained using commercial simulation tools, outperforming them in terms of computational time


ieee antennas and propagation society international symposium | 2005

A numerically stable transmission line model for multilayered Green's functions

P. Crespo-Valero; Michael Mattes; I. Stevanovic; J. R. Mosig

The evaluation of a multilayered media Greens function (GF) in the spectral domain can be reduced to the analysis of a uniform transmission line (TL) circuit along the normal component (Michalski, K. and Mosig, J., IEEE Trans. Antennas and Propag., vol.45, p.508-19, 1997). In a practical situation, the computation of the GF requires many evaluations of this circuit by a transmission line model (TLM) (Michalski and Mosig, 1997; Chow, Y.L. et al., IEE Proc. Microwaves, Antennas and Propag., vol.145, p.85-91, 1998) which combines very different TL states (under cutoff, resonance, etc.). In addition, modern manufacturing techniques include components made of new materials and dimensions which commonly produces instabilities in a classical TLM analysis. The paper proposes a fast and accurate TLM algorithm to overcome this problem.


european microwave conference | 2006

Diakoptic Approach to Analysis of Microwave Transmission Lines

Dragan I. Olcan; I. Stevanovic; Juan R. Mosig; Antonije R. Djordjevic

We present a diakoptic approach to analysis of microwave transmission lines. The approach is based on the equivalence theorem. Presented results show that the diakoptic approach is much faster than the simultaneous analysis of the whole system. The proposed diakoptic approach decomposes the problem into smaller problems that can be independently solved, which makes this approach suitable for implementation on parallel processors


european conference on antennas and propagation | 2006

Green's functions for planar structures in periodic skewed 2-D lattices using Ewald transformation

I. Stevanovic; Juan R. Mosig

In this paper, we apply the Ewald acceleration technique to the efficient evaluation of periodic Greens functions (GFs) for 2-D skewed lattices. We develop the expression for the optimal value of the splitting parameter for 2-D skewed lattices, derive the gradient of the scalar potential GFs and address the extraction of singularity for both vector/scalar potential GF and their curl/gradient. Several numerical implementation issues are also discussed leading to further enhancement in computational speed, accuracy, and numerical stability.


IEEE Antennas and Propagation Magazine | 2009

Integral Equation Modeling of Waveguide-Fed Planar Antennas

I. Stevanovic; Francesco Merli; Pedro Crespo-Valero; Winfried Simon; Sybille Holzwarth; Michael Mattes; J. R. Mosig

This paper presents a method for the analysis of planar multilayered waveguide-fed antennas. The method combines mixed-potential integral equations (for laterally open regions) and modal-field integral equations (for laterally closed regions) with a seamless transition between the two domains. The method has been implemented in a numerical tool, and the simulation results of two waveguide-fed planar structures are presented. The results are in good agreement with both measurements and simulations obtained with other commercial electromagnetic tools. Comparisons in terms of memory utilization and simulation time have also been performed.


IEEE Transactions on Microwave Theory and Techniques | 2008

On the Coupling Integrals Arising in the Method of Moments Formulation of Laterally Bounded Structures

Pedro Crespo-Valero; I. Stevanovic; Daniel Llorens del Río; Juan R. Mosig

A generic integral equation and method of moments formulation is presented for laterally bounded stratified media including planar metallization. The main asset of the developed approach is its flexibility, as it encompasses generic lateral boundary conditions and explicitly applies to any linear subsectional basis functions with constant surface divergence. This includes the rooftop functions on rectangular and triangular supports currently proposed in standard method of moment meshers. This approach provides closed expressions for the coupling integrals appearing in the method of moments matrix elements. These formulas are based of Greens functions modal expansions and in the possibility, conclusively demonstrated in this paper to transform the surface integrals into contour integrals allowing an efficient and systematic implementation of the procedure. Full derivations are presented for several lateral boundary conditions, including rectangular and circular metallic cavities and periodic structures. Numerical examples including the analysis of real-life planar boxed circuits are presented. In all cases the obtained results compare favourably with other existing techniques.


ieee antennas and propagation society international symposium | 2006

Electromagnetic Scattering from a 2-D Array of 3-D Metallic Objects

I. Stevanovic; P. Crespo-Valero; J. R. Mosig

We present a formulation of a space-domain integral-equation (IE) method for the analysis of three-dimensional (3-D) metallic objects within a periodic two-dimensional (2-D) triangular lattice. The computation of the space-domain Greens function (GF) is accelerated using the Ewald transformation. The method can be applied to a wide variety of free-standing metallic periodic structures, including planar frequency-selective surfaces, three-dimensional photonic crystals, and metamaterials


international conference on applied electromagnetics and communications | 2005

Models for Simulating Switched Beam Antennas in Radio Planning

Juliane Iten Simões; I. Stevanovic; Anja K. Skrivervik

This paper presents two models of switched beam antennas that can be used in radio planning and interference mitigation studies based on Monte-Carlo analysis. The models are implemented in a sharing and compatibility study of two different radio systems that share the same geographical area and have neighboring frequency bands. The results agree very well with the one obtained using measured radiation patterns of the switched beam antenna, eliminating the inconvenience to know the radiation pattern of all the beams in the switched beam antenna

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Juan R. Mosig

École Polytechnique Fédérale de Lausanne

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J. R. Mosig

École Normale Supérieure

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Anja K. Skrivervik

École Polytechnique Fédérale de Lausanne

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F. Nunez

École Polytechnique Fédérale de Lausanne

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Michael Mattes

École Normale Supérieure

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G. Gildenblat

Arizona State University

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Xin Li

Carnegie Mellon University

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Frédéric Bongard

École Polytechnique Fédérale de Lausanne

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