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Now showing items 120 of 27

Analysis and design of broadcast tower antenna systems
(Bilkent University, 2014)In broadcasting, the coverage and interference requirements of antennas are designated in terms of Effective Radiated Power (ERP), tower location and height, and antenna patterns. When antennas are tailored to satisfy ... 
Analysis and implementation of prediction models for the design of fixed terrestrial pointtopoint systems
(Bilkent University, 2015)In this study, propagation link analysis and implementation of prediction models for the design of fixed terrestrial pointtopoint systems are aimed. Different propagation models in the literature are examined as case ... 
Analysis of cylindrical reflector antennas in the presence of circular radomes by complex sourcedual series approach
(Bilkent University, 1996)The radiation from cylindrical reflector antennas is analyzed in an accurate manner for both H and E polarization cases. The problem is first formulated in terms of the dual series equations and then it is regularized ... 
Analysis of dielectric waveguide bends and curved coupler structures using finite difference beam propagation method
(Bilkent University, 1997)In this thesis, implicit finite difference beam propagation method based on Crank Nicholson discretization procedure is implemented and applied to the analysis of propagation of optical beams in an orthogonal bend and a ... 
Antenna analysis
(Bilkent University, 2009)Multipleinputmultipleoutput (MIMO) wireless communication systems have been attracting huge interest, since a boost in the data rate was shown to be possible, using multiple antennas both at the transmitter and receiver. ... 
Application and improvement of SAGE algorithm for channel parameter estimation
(Bilkent University, 2008)In recent years, Multiple Input Multiple Output (MIMO) systems have gained importance due to the improvements on the performance of radio systems. Channel parameter estimation is an important factor in the design and ... 
Application of biconjugate gradient stabilized method with spectral acceleration for propagation over terrain profiles
(Bilkent University, 2003)Using the Method of Moments (MoM) for the computation of electromagnetic radiation / surface scattering problems is a very popular approach since obtained results are accurate and reliable. But the memory requirement in ... 
Application of spectral acceleration forwardbackward method for propagation over terrain
(Bilkent University, 2003)Mobile radio planning requires the accurate prediction of electromagnetic eld strengths over large terrain pro les. However, numerical methods, like MoM, become not suitable for electrically large surfaces, because of ... 
Atmospheric turbulence modeling and aperture analysis for optimizing receiver design and system performance on free space optical communication links
(Bilkent University, 2012)Strong turbulence measurements that are taken using real time optical wireless experimental setups are valuable when studying the effects of turbulence regimes on a propagating optical beam. In any kind of Free Space ... 
Comparison of two physical optics integration approaches for electromagnetic scattering
(Bilkent University, 2008)A computer program which uses two different Physical Optics (PO) approaches to calculate the Radar Cross Section (RCS) of perfectly conducting planar and spherical structures is developed. Comparison of these approaches ... 
Computer aided analysis and simulation of complex passive integrated optical circuits
(Bilkent University, 1993)In this thesis, a method is developed for the analysis and simulation of arbitrary complex, single layer, rectilinear, passive optical interconnection circuits. The method considers dielectric waveguide type optical ... 
Design and implementation of a wireless passive sensing system for structural health monitoring
(Bilkent University, 201606)Structural health monitoring (SHM) aims to ensure detection and prevention of damage in structures and protection of human life via observation of certain damage indicators. In SHM, one of the most important damage indicators ... 
Development and implementation of SBR technique for scattering and RCS problems
(Bilkent University, 201610)Full wave solution techniques are preferred to calculate the electromagnetic characteristic of an object. These methods give very accurate results. However, when the object is electrically large regarding wavelength, ... 
Efficient computation of surface fields excited on an electrically large circular cylinder with an impedance boundary condition
(Bilkent University, 2006)An efficient computation technique is developed for the surface fields excited on an electrically large circular cylinder with an impedance boundary condition (IBC). The study of these surface fields is of practical ... 
The examination of new equivalent edge currents in the prediction of high frequency backscattering from flat plates
(Bilkent University, 1991)Equivalent edge currents based on the geometrical theory of dilfraction (GTD) have been utilized for the prediction of electromagnetic scattering from edged bodies. These equivalent currents are use Keller’s diffraction ... 
The Examination of the effect of polarization on the radiation losses of bent optical fibers
(Bilkent University, 1990)It has long been recognized that the bending losses in weakly guiding optical fibers, is independent of the polarization for large bend radius. We showed this fact using the volume equivalent current method. The procedure ... 
Implementation of physical theory of diffraction for radar cross section calculations
(Bilkent University, 2002)A computer program which uses the Physical Theory of Diffraction (PTD) method to calculate the Radar Cross Section (RCS) of perfectly conducting targets with arbitrary shape is developed. Given an arbitrary surface, it ... 
Nonfoster impedance matching for electrically small capacitive antennas
(Bilkent University, 2014)Device scaling and componentminiaturization are the main drivers of the development of electronic technology. In time, electronic devices have become smaller in size and hence, the scaling down of antenna dimensions has ... 
Numerical study of plane wave scattering from cylindrical cavitybacked apertures with outer or inner material coating
(Bilkent University, 1993)In this thesis, a dualseriesbased solution is obtained for the scattering of a time harmonic plane wave from a cavitybacked aperture(CBA) which is formed by a slitted infinite circular cylinder coated with absorbing ... 
Polarization included geometry based channel modeling for MIMO systems
(Bilkent University, 2008)Most of the studies in the literature about channel modeling do not include the polarization. Aiming to develop a more realistic geometric model including polarization, the channel characteristics are examined using ...