Numerically efficient analysis and design of conformal printed structures in cylindrically layered media

Download

index.pdf

Date

2007

Author

Acar, Cüneyt R

Metadata

Show full item record

Item Usage Stats

108
views

55
downloads

The complete set of Green’s functions for cylindrically layered media is presented. The formulations reported in the previously published work by Tokgöz (M.S.Thesis, 1997) are recalculated, the missing components are added and a solution to the problem when (rho equals rhop) is proposed. A hybrid method to calculate mutual coupling of electric or magnetic current elements on a cylindrically layered structure using MoM is proposed. For the calculation of MoM matrix entries, when (rho equals rhop) and fi is not close to fip, the closed-form Green’s functions are employed. When fi is close to fip, since the spectral-domain Green’s functions do not converge, MoM matrix elements are calculated in the spectral domain. The technique is applied to both printed dipoles and slots placed on a layered cylindrical structure. The computational efficiency of the anaysis of mutual coupling of printed elements on a cylindrically layered structure is increased with the use of proposed hybrid method due to use of closed-form Green’s functions.

Subject Keywords

Electrical Engineering

URI

http://etd.lib.metu.edu.tr/upload/3/12608841/index.pdf
https://hdl.handle.net/11511/17187

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Joint frequency offset and channel estimation Avan, Muhammet; Candan, Çağatay; Department of Electrical and Electronics Engineering (2008) In this thesis study, joint frequency offset and channel estimation methods for single-input single-output (SISO) systems are examined. The performance of maximum likelihood estimate of the parameters are studied for different training sequences. Conventionally training sequences are designed solely for the channel estimation purpose. We present a numerical comparison of different training sequences for the joint estimation problem. The performance comparisons are made in terms of mean square estimation err...
Analysis of slot coupled patch antennas using closed form green’s functions Göksu, Mesut; Dural Ünver, Mevlüde Gülbin; Department of Electrical and Electronics Engineering (2009) In this thesis, an analysis technique for the slot coupled patch antennas using MoM in conjunction with the closed form Green’s functions is presented. Slot coupled patch antennas are fed by a microstrip open stub which is coupled to the patch through an electrically small slot. Current distributions over the microstrip line, slot line and the patch are represented by rooftop basis functions. First, a relatively simple structure, microstrip coupled slot line is investigated using the proposed technique. The...
Optimum Nyquist filters with controlled time and frequency characteristics Tuncer, Temel Engin (Institution of Engineering and Technology (IET), 2002-10-10) A design procedure is presented for pulse shaping filters based on the eigenfilter method. This method presents great flexibility for the control of the tail decay and stopband attenuation of the pulse shaping filters. A variety of optimum filters can be designed which are better than raised cosine filters both in time and frequency.
Image segmentation based on variational techniques Altınoklu, Metin Burak; Ünver, Baki Zafer; Department of Electrical and Electronics Engineering (2009) In this thesis, the image segmentation methods based on the MumfordShah variational approach have been studied. By obtaining an optimum point of the Mumford-Shah functional which is a piecewise smooth approximate image and a set of edge curves, an image can be decomposed into regions. This piecewise smooth approximate image is smooth inside of regions, but it is allowed to be discontinuous region wise. Unfortunately, because of the irregularity of the Mumford Shah functional, it cannot be directly used for ...
Software process improvement in a software development environment Konuralp, Zeynep; Bilgen, Semih; Department of Electrical and Electronics Engineering (2007) A software process improvement study is presented. The literature on software development processes and their improvement is reviewed. The current peer review process at Software Engineering Directorate of the X Company, Ankara, Türkiye (XCOM) is studied and the static software development metrics based on a recent proposal have been evaluated. The static software metrics based improvement suggestions and the author’s improvement suggestions discussed with the senior staff are compared. An improved peer rev...

Citation Formats

C. R. Acar, “Numerically efficient analysis and design of conformal printed structures in cylindrically layered media,” Ph.D. - Doctoral Program, Middle East Technical University, 2007.