Tuncay Birand

Application of Spherical Wave Theory to Rectangular Apertures

AEU-Archiv fur Elektronik und Ubertragungstechnik, 1975

1990'LARIN Antenleri: Geleceğin Uydu Ve Karasal Iletişim Sistemleri Için Aktif Anten Dizileri

TÜBİTAK EEEAG31.01.1993Uydu ve/veya karasal iletişim sistemlerinde kullanılmaları öngörülen faz t... more TÜBİTAK EEEAG31.01.1993Uydu ve/veya karasal iletişim sistemlerinde kullanılmaları öngörülen faz taramalı aktif dizi anten sistemlerinin geliştirilmeleri ve bu anten sistemlerinden yeni uygulama alanlarında yararlanılmasını amaçlayan COST 223 projesi, çalışmaları üye ülkelerin katılımlarıyla gerçekleştirilen üç ayrı çalışma grubunca yürütülmüş ve ilgili çalışmaların koordinasyonu proje süresince çeşitli ülkelerde yapılan proje yönetim kurulu (management committee: MC) toplantıları ile sağlanmıştır. COST 223 projesi çalışma alanları üç çalışma grubunda toplanmıştır. Birinci grup (WGl) çalışmalarım baskılı ve baskısız anten dizilerinde, ikinci grup (WG2) aktif devre tasarımlarında, üçüncü grup (WG3) ise sistem tasarımı ile ilgili bilgisayar yazılımlarında yoğunlaştırmıştır. Ülkemiz WG l ve WG3 gruplarının çalışmalarına katılmıştır. Proje kapsamında grubumuz geniş bantlı baskı devre yarık antenler ve geçiş devrelerinin tasarımı, parazitik eleman içeren mikroşerit antenlerin tam dalga an...

Distributed amplifiers

Determination of antenna far-field radiatiation-patterns from near-field data

Ph.D. - Doctoral Progra

Computationally efficient analysis and design of printed structures

IEEE Antennas and Propagation Society International Symposium. 1996 Digest

An efficient and rigorous technique, based on the spatial-domain MOM in conjunction with the clos... more An efficient and rigorous technique, based on the spatial-domain MOM in conjunction with the closed-form Green's functions, is presented for the analysis and the design of printed geometries in a multilayer environment. The derivation of the closed-form Green's functions and the analytical evaluation of the MOM matrixentries have alleviated the most of the computational burden of the spatial-domain MOM. In addition, with the use of the order recursive Gaussian elimination in the solution of the MOM matrix equation, when the original geometry is modified, the computational efficiency of the spatial-domain MOM IS further improved. The assessment of this improvement is demonstrated here, in the characterization of a series-fed microstrip array and an inset-fed microstrip antenna.

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Computer-aided analysis of microstrip antennas employing parasitic elements

International Journal of Microwave and Millimeter-Wave Computer-Aided Engineering, 1993

A number of methods are available for analyzing microstrip antenna configurations. The full-wave ... more

Analytical evaluation of the MoM matrix elements

IEEE Transactions on Microwave Theory and Techniques, 1996

Derivation of the closed-form Green's functions has eliminated the computationally expensive eval... more Derivation of the closed-form Green's functions has eliminated the computationally expensive evaluation of the Sommerfeld integrals to obtain the Green's functions in the spatial domain. Therefore, using the closed-form Green's functions in conjunction with the method of moments (MOM) has improved the computational efficiency of the technique significantly. Further improvement can he achieved on the calculation of the matrix elements involved in the MOM, usually double integrals for planar geometries, by eliminating the numerical integration. The contribution of this paper is to present the analytical evaluation of the matrix elements when the closed-form Green's functions are used, and to demonstrate the amount of improvement in computation time.

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Use of computationally efficient method of moments in the optimization of printed antennas

IEEE Transactions on Antennas and Propagation, 1999

Derivation of the closed-form Green's functions and analytical evaluation of the method of moment... more Derivation of the closed-form Green's functions and analytical evaluation of the method of moments (MOM) matrix entries have improved the computational efficiency of the significantly in the analysis of printed geometries. With this background in mind, an extension of this efficient numerical technique is to incorporate an optimization algorithm and to assess its potential as a computer-aided design (CAD) tool. Therefore, we have employed the Gradient search and Genetic algorithms, in conjunction with the electromagnetic (EM) simulation technique, to a number of representative examples of interest.

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Aktif faz taramalı diziler ve dizi beslemeli antenler

TÜBİTAK EEEAG01.07.1997COST 245 "Aktif Faz Taramalı Diziler ve Dizi Beslemeli Antenler"... more TÜBİTAK EEEAG01.07.1997COST 245 "Aktif Faz Taramalı Diziler ve Dizi Beslemeli Antenler" (Active Phased Arrays and Array Fed Antennas) Projesinin Ortak Niyet Beyanı ülkemiz adına -.imzalanarak, çalışmaları ODTÜ Elektrik ve Elektronik Mühendisliği Bölümünde görevli ekip tarafından yürütülmüştür. AT ülkeleriyle bilimsel işbirliği içerisinde yürütülen bu proje sonucu, diğer üye ülkelerin araştırma ve endüstriyel kuruluşlarında yapılan çalışmaları yakından izlemek ve bu üyelerin konuyla ilgili problemleri çözüm yollarını ele alış biçimleri hakkında fikir sahibi olmak imkanı elde edilmiştir. Proje kapsamında yapılan çalışmalar A. Faz taramalı anten dizileri konusundaki çalışmalar, B. Monolitik mikrodalga entegre devrelerle (MMIC) ile ilgili çalışmalar ve C. Geniş bantlı antenler ve nümerik metotlar olarak üç ana grupta toplanmıştır. Birinci .bölümde düzlemsel bir çift huzmeli (dual beam) TVRO anteni gerçekleştirmek üzere ;ımikroşerit:faz taramalı anten dizileri üzerinde kapsamlı...

Engineering Tomorrow's Engineers

In this article, the author discusses education and research activities with special emphasis giv... more In this article, the author discusses education and research activities with special emphasis given to initiatives for improving and monitoring the educational system at the Middle East Technical Univer- sity in Ankara, Turkey. The experiences gained through activities related to curriculum design, accreditation, globalisation, collaboration with other institutions at the local and international levels is also reported. The impact of such activities on both the local and international communities are also presented and discussed in this article.

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Prediction of far-field patterns using synthesized steerable spatial filtering functions

… Society International Symposium, 1989

Skip to Main Content. IEEE.org | IEEE Xplore Digital Library | IEEE Standards Association | Spect... more

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UICEE-METU collaboration in research and engineering education

Australasian. Journal of Engineering Education, 1997

Analytical evaluation of the MoM matrix elements

IEEE Transactions on Microwave Theory and Techniques, 1996

Derivation of the closed-form Green's functions has eliminated the computationally expensive eval... more Derivation of the closed-form Green's functions has eliminated the computationally expensive evaluation of the Sommerfeld integrals to obtain the Green's functions in the spatial domain. Therefore, using the closed-form Green's functions in conjunction with the method of moments (MOM) has improved the computational efficiency of the technique significantly. Further improvement can he achieved on the calculation of the matrix elements involved in the MOM, usually double integrals for planar geometries, by eliminating the numerical integration. The contribution of this paper is to present the analytical evaluation of the matrix elements when the closed-form Green's functions are used, and to demonstrate the amount of improvement in computation time.

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Use of computationally efficient method of moments in the optimization of printed antennas

IEEE Transactions on Antennas and Propagation, 1999

Abstract Derivation of the closed-form Green's functions and analytical evaluation of the m... more

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Improving the Numerical Efficiency of the Method of Moments for Printed Geometries

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Improving the numerical efficiency of the method of moments for printed geometries

Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting, 1994

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