Search

Your search keyword '"Dragan, I."' showing total 17 results
Start Over Author "Dragan, I." Publisher wiley
17 results on '"Dragan, I."'

1. High-Gain Quad Array of Nonuniform Helical Antennas

Author

Jelena Lj. Dinkić, Dragan I. Olćan, Antonije R. Djordjević, and Alenka G. Zajić

Subjects
Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Cellular telephone services industry. Wireless telephone industry, HE9713-9715
Abstract

We present a design of a high-gain quad array of nonuniform helical antennas. The design is obtained by optimization of a 3-D numerical model of four nonuniform helical antennas placed above a ground plane, including a model of a feeding network, utilizing the method of moments with higher-order basis functions. The gain of one optimal nonuniform helical antenna can be about 2.5 dB higher than the gain of a uniform helical antenna of the same axial length. Creating a 2×2 array further increases the gain up to about 6 dB. The resulting quad array fits into a box whose dimensions are 2.5×3.3×3.3 wavelengths, and the gain in the main radiating direction is about 20.5 dBi in the frequency range from 0.9 GHz to 1.1 GHz. The design is verified by measurements of a prototype of the quad array.

Published
2019
Full Text
View/download PDF

2. Scattering from anisotropic surfaces analyzed with method of moments

Author

Nikola Basta and Dragan I. Olcan

Subjects
Materials science, Condensed matter physics, Scattering, 020206 networking & telecommunications, 02 engineering and technology, Method of moments (statistics), Conductivity, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, 010306 general physics, Anisotropy
Published
2018

6. Wideband multilayer directional coupler with tight coupling and high directivity

Author

Alenka Zajic, Dragan I. Olcan, Veljko Napijalo, and Antonije R. Djordjevic

Subjects
Engineering, Design data, business.industry, Acoustics, 020208 electrical & electronic engineering, 020206 networking & telecommunications, 02 engineering and technology, STRIPS, Condensed Matter Physics, Directivity, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, law, Dispersion (optics), 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Power dividers and directional couplers, Hybrid coupler, Electrical and Electronic Engineering, Wideband, business, Microwave
Abstract

A novel, wideband, symmetrical, printed directional coupler is described, which has tight coupling and high directivity. The coupler consists of four interconnected strips printed in two layers. The dimensions of the strips are optimized to minimize the dispersion of propagating modes. Design data are provided for some typical practical cases. The theoretical results are verified experimentally. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2261–2267, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27051

Published
2012

7. Modeling and design of milled microwave printed circuit boards

Author

Dragan I. Olcan, Antonije R. Djordjevic, and Alenka Zajic

Subjects
010302 applied physics, Engineering, Process (engineering), Circuit performance, business.industry, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Printed circuit board, Electric power transmission, 0103 physical sciences, Electronic engineering, Modeling and design, Electrical and Electronic Engineering, 0210 nano-technology, business, Microwave, Electronic circuit
Abstract

This article investigates the influence of milling process on properties of printed microwave circuits. Furthermore, design guidelines are proposed for optimizing the milling process by leaving large unmilled copper surfaces on the board without deteriorating circuit performance. The proposed concepts are experimentally verified. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:264–270, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25724

Published
2010

8. Diakoptic approach to analysis of multiconductor transmission lines

Author

Antonije R. Djordjevic, Ivica Stevanovic, Juan R. Mosig, and Dragan I. Olcan

Subjects
Surface (mathematics), Mathematical optimization, General method, Numerical analysis, 020208 electrical & electronic engineering, 020206 networking & telecommunications, 02 engineering and technology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Reduction (complexity), Boundary integral equations, Electric power transmission, 0202 electrical engineering, electronic engineering, information engineering, Applied mathematics, Electrical and Electronic Engineering, Mathematics
Abstract

We present a general method for numerical analysis of electrically large electromagnetic-field problems, which is based on merging diakoptic approach and surface integral-equation formulations. Compared with the classical approach, the proposed method provides significant reduction of c.p.u. time and storage, preserving high accuracy of results.

Published
2008

15. The academic environment: the students’ perspective

Author

Divaris, K., primary, Barlow, P. J., additional, Chendea, S. A., additional, Cheong, W. S., additional, Dounis, A., additional, Dragan, I. F., additional, Hamlin, J., additional, Hosseinzadeh, L., additional, Kuin, D., additional, Mitrirattanakul, S., additional, Mo’nes, M., additional, Molnar, N., additional, Perryer, G., additional, Pickup, J., additional, Raval, N., additional, Shanahan, D., additional, Songpaisan, Y., additional, Taneva, E., additional, Yaghoub-Zadeh, S., additional, West, K., additional, and Vrazic, D., additional

Published
2008
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results