Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/260
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Browsing Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu by Author "17740"
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Article Citation Count: Şener, G. (2013). A new algorithm to locate the zero fields in antenna radiation pattern measurements. Journal Of Electromagnetic Waves And Applications, 27(10), 1238-1245. http://dx.doi.org/10.1080/09205071.2013.805169A new algorithm to locate the zero fields in antenna radiation pattern measurements(Taylor&Francis Ltd, 2013) Şener, Göker; 17740This article describes a new method to determine the directions of the zero fields in antenna radiation measurements. Zero-field detection is important when there are null constraints in antenna analysis or synthesis. To identify the directions of the zero fields, the general practice is to measure the propagating field in a number of small incremental angles in 2D space. For an antenna with narrow beam characteristics, even more sampling is necessary for accuracy. As a result, the time efficiency is decreased. In order to speed up the process, an optimization algorithm may be employed such that the measurements may converge to the zero-field locations faster. However, the difficulty is that many optimization algorithms require the use of derivatives of the pattern function. The algorithm proposed in this paper is derivative free and utilizes only the amplitude data, hence it is suitable and applicable to antenna measurements providing time efficiency.Publication Citation Count: Sener, Goker; Alatan, Lale; Kuzuoglu, Mustafa, "Design of irregularly shaped patch antennas by using the multiport network model", 2008 IEEE Antennas And Propagation Society International Symposium, Vols 1-9, (2008).Design of irregularly shaped patch antennas by using the multiport network model(IEEE, 2008) Şener, Göker; Alatan, Lale; Kuzuoğlu, Mustafa; 17740Article Citation Count: Şener, G. (2012). Multiport analysis by pade approximation. Progress In Electromagnetics Research-Pier, 125, 203-218. http://dx.doi.org/10.2528/PIER12011805Multiport analysis by pade approximation(E M W Publishing, 2012) Şener, Göker; 17740In this paper, a new method to analyze arbitrary shaped microstrip patch antennas is introduced. This method uses the multiport network model (MNM) together with a mathematical approximation called the "Pade approximation" such that the antenna input impedance obtained from the multiport analysis is approximated as a rational function of polynomials. Then, the roots of the denominator of this rational function are used to determine the antenna resonant characteristics. This new method is more time efficient than the standard multiport analysis because the evaluations are made at a single frequency. In the standard method, evaluations are made at multiple frequency values throughout the analysis. Results obtained by the new method are verified using the examples of rectangular and slot loaded compact microstrip patch antennas. Computational efforts for both procedures are presentedPublication Citation Count: Şener, Göker; Alatan, Lale; Kuzuoğlu, Mustafa, "Use of matrix pade approximation in the analysis of ırregularly shaped patch antennas with multiport network model", ICEAA: 2009 International Conference On Electromagnetics In Advanced Applications, Vols 1 And 2, (2009).Use of matrix pade approximation in the analysis of ırregularly shaped patch antennas with multiport network model(IEEE, 2009) Şener, Göker; Alatan, Lale; Kuzuoğlu, Mustafa; 17740A new procedure for implementing the multiport network model for analyzing two-dimensional microwave circuits is proposed. The proposal procedure leads to more efficient evaluation of impedance matrices than the procedure known earlier. The computational efforts in the two procedures are compared.
