Browsing by Author "Aksen, Ahmet"

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Citation Count: 0
Circuit Model for Given Reflectance Data Constructed With Mixed Lumped and Distributed Elements for High Speed/High Frequency Communication Systems
(IEEE Computer Society, 2005) Yarman, Binboğa Sıddık; Şengül, Metin Y.; Kılınç, Ali; Aksen, Ahmet
In this paper, a reflectance-based "non linear interpolation method" is presented to model the measured or computed data, obtained from a "passive one-port physical device" using mixed lumped and distributed elements. Mixed element model is constructed with cascade connection of series inductors [L], commensurate transmission lines or so called Unit Elements [UE] and shunt capacitors[C]. Basis of the new model rests on the numerical generation of the scattering parameters of the lossless two-port constructed with cascade connection of simple [L]-[UE]-[C] elements which describes a lossless 2-port in Darlington sense. The new modeling technique does not require direct optimization of the circuit elements of the selected topology. Rather, two-variable reflection coefficient is directly determined by means of a non linear but "convergence guaranteed" interpolation process to best fit the given data. A low-pass filter input reflection coefficient modeling example is included to exhibit the utilization of the proposed modeling method.
Citation Count: 1
Reflectance data model with mixed lumped and distributed elements for wireless communication systems
(2005) Yarman, Binboğa Sıddık; Şengül, Metin Y.; Kılınç, Ali; Aksen, Ahmet
In this paper, a new method is presented to model the given reflectance data obtained from a "passive one-port physical device", as a lossless two port consists of lumped and distributed elements. Basis of the new method rests on the interpolation of the given data as a realizable bounded-real (BR) reflection function in two variables. The desired circuit model is then obtained as the result of the synthesis of this function in two kinds of elements; namely, distributed and lumped circuit elements. An algorithm is presented to generate the circuit model step by step and an example is also included to exhibit the utilization of the new modeling algorithm.
Citation Count: 5
A Single Matching Network Design for a Dual Band Pifa Antenna Via Simplified Real Frequency Technique
(2006) Lindberg, Peter; Şengül, Metin Y.; Çimen, Ebru Gürsu; Yarman, Binboğa Sıddık; Rydberg, Anders; Aksen, Ahmet
In this paper, the matched performance of a dual band PIFA antenna is reported. The return loss of the antenna has been optimized over the popular commercial wireless communication bands of 824-960 MHz and 1710-1990 MHz using only one matching network. The network was synthesized using the Simplified Real Frequency Technique, which yields an "easy to implement circuit topology" and realizable component values. With the implemented matching network, a simultaneous measured bandwidth enhancement of 58% and 127% has been achieved in the low and high frequency band, respectively, without significant reduction of radiation efficiency.