Electrical - Electronic Engineering / Elektrik - Elektronik Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/11

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Now showing 1 - 6 of 6
  • Conference Object
    Citation - Scopus: 1
    A Compact Dual-Band Gcpw-Fed Antenna for Wlan, Wimax and Bluetooth Applications
    (IEEE, 2017) Bozdağ, Göksenin; Kuştepeli, Alp
    In this study, a compact dual-band grounded coplanar waveguide fed printed planar monopole antenna (GCPW-PPMA) is designed and realized for Bluetooth, WLAN and WiMAX applications. Antenna is designed in two stages and a low-cost FR4 substrate is used. Firstly, a GCPW fed trapezoidal shape printed monopole radiator patch is designed at 5.8 GHz band and its bandwidth is improved by employing an inset. In the second phase, two different slot geometries are employed to excite 2.45 GHz band. Slot loadings, radiating patch and inset feeding are optimized and the dimensions of the resulting antenna are obtained as 25mm x 27.5 mm. Simulated and measured results are in good agreement, and measured operating bands of the proposed antenna are 2.40 GHz-2.52 GHz and 3.76 GHz-5.875 GHz for S-11 < -10 dB. The proposed GCPW-PPMA has dipole like radiation patterns in the operating bands. Its measured realized gains are 1 dB at 2.45 GHz and 2.5 dB at 5.8 GHz. The proposed antenna is suitable for space and weight limited portable devices.
  • Conference Object
    Citation - WoS: 1
    Citation - Scopus: 1
    High Frequency Diffraction of Cylindrical Waves by Perfectly Conducting Successive Step Discontinuities
    (Institute of Electrical and Electronics Engineers Inc., 2006) Türetken, B.; Alkumru, Ali; Büyükaksoy, A.; Kuştepeli, Alp
    The diffraction of high frequency cylindrical electromagnetic waves by step discontinuities is investigated rigorously by using the Fourier transform technique in conjunction with the mode matching method. The hybrid method of formulation gives rise to a scalar Wiener-Hopf equation of the third kind, the solution of which contains infinitely many constants satisfying infinite systems of linear algebraic equations.
  • Conference Object
    Electromagnetic Scattering From Arbitrary Flat Plates: Analysis of the Problem by Using Method of Moments With Different Sinc Type Basis Functions
    (Institute of Electrical and Electronics Engineers Inc., 2011) Özbakış, Başak; Oğuzer, Taner; Kuştepeli, Alp
    In this paper, three dimensional electromagnetic scattering problem is solved by using pulse-sinc type basis functions in the Method of Moments (MoM) procedure. This method is applied to the scattering problems of a plane wave illuminated flat arbitrary geometries. Pulse-sinc based MoM formulation is developed, the current densities and radar cross section of different geometries are investigated. The radar cross section (RCS) for co-polarized and cross polarized cases of the flat plate geometries are compared with both of the results obtained from the sinc-sinc based formulation and SuperNEC. The results obtained by using pulse-sinc fornulation are in very good agreement with those of the SuperNEC. © 2011 IEEE.
  • Conference Object
    Citation - Scopus: 1
    Three-Dimensional Electromagnetic Scattering From Flat Plates by Using Sinc-Type Basis Functions in Method of Moments
    (Institute of Electrical and Electronics Engineers Inc., 2009) Özbakış, Başak; Oğuzer, Taner; Kuştepeli, Alp
    Sinc functions are used in the basis and testing procedures in the conventional method of moments (MoM) formulation. But unlike conventional MoM, simple pointwise meshing is enough and no integral computation is required due to the mathematical properties of the sinc function. The simulation results of surface current densities and radar cross section for a few wavelength square flat plate are obtained by using our own codes. The results are compared with those of the rooftop basis functions. The CPU-time decreases by half of the time of the conventional method. The error that occurs from the approximated integral of the sinc function in the computation of main matrix elements is very small and decreases while the bandwidth of the sinc function increases.
  • Conference Object
    Citation - WoS: 2
    Citation - Scopus: 2
    A novel square-spiral strip antenna
    (Institute of Electrical and Electronics Engineers Inc., 2007) Saynak, Uğur; Kuştepeli, Alp
    A square-spiral strip antenna is designed considering the procedure used to obtain log-periodic antennas. Simulation results of the new design are compared with those of the well known and widely used Archimedean spiral antenna in terms of the frequency dependency. The effect of dielectric substrate used to support the antennas is also investigated.
  • Article
    Citation - WoS: 52
    Citation - Scopus: 67
    On the Splitting Parameter in the Ewald Method
    (Institute of Electrical and Electronics Engineers Inc., 2000) Kuştepeli, Alp; Martin, Anthony Q.
    An investigation of the Ewald method is presented. The method involves a splitting parameter that is theoretically an arbitrary number. An analysis is presented to show why the splitting parameter cannot always be treated as arbitrary in calculations and how this parameter should be chosen for all. periodic spacing of a structure.