Transformation Electromagnetics Based Analysis of Waveguides With Random Rough or Periodic Grooved Surfaces

Date

2013-02-01

Author

Ozgun, Ozlem
Kuzuoğlu, Mustafa

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

259
views

0
downloads

A computational model is introduced which employs transformation-based media to increase the computational performance of finite methods (such as finite element or finite difference methods) for analyzing waveguides with grooves or rough surfaces. Random behavior of the roughness is taken into account by utilizing the Monte Carlo technique, which is based on a set of random rough surfaces generated from Gaussian distribution. The main objective of the proposed approach is to create a single mesh, and to analyze the effects of the parameters of grooves (such as shape and height) and of roughness (correlation length and root-mean-square height) on both transverse magnetic and transverse electric mode cutoff wavenumbers and field distributions, without repeating mesh generation at each step. This is achieved by introducing a transformation medium within the computational domain, and by computing the material parameters of the medium via the coordinate transformation technique. At each time the surface geometry is changed, only the material parameters are recomputed with respect to the new geometry. Therefore, a great reduction in CPU time is achieved. The technique is analyzed by means of various finite element simulations involving both 2-D parallel plate waveguides and 3-D waveguides of uniform cross section.

Subject Keywords

Electrical and Electronic Engineering, Radiation, Condensed Matter Physics

URI

https://hdl.handle.net/11511/48712

Journal

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES

DOI

https://doi.org/10.1109/tmtt.2012.2231428

Collections

Department of Electrical and Electronics Engineering, Article

Suggestions

OpenMETU
Core

Causal and Passive Parameterization of S-Parameters Using Neural Networks Torun, Hakki Mert; Durgun, Ahmet Cemal; Aygun, Kemal; Swaminathan, Madhavan (Institute of Electrical and Electronics Engineers (IEEE), 2020-10-01) Neural networks (NNs) are widely used to create parametric models of S-parameters for various components in electronic systems. The focus of deriving these models has so far been numerical error reduction between the NN-generated S-parameters and the data source. However, this is not sufficient when creating such NNs since it does not guarantee predicted S-parameters to be physically consistent, i.e., passive and causal, which restricts their use cases. This article, therefore, proposes a causality enforcem...
Mutual coupling of printed elements on a cylindrically layered structure using closed-form Green's functions Acar, R. C.; Dural, G. (EMW Publishing, 2008-01-01) A hybrid method to calculate mutual coupling of electric or magnetic current elements on a cylindrically layered structure using closed-form Green's functions is presented. When rho = rho' and phi is not very close to phi', closed-form Green's functions are employed in the calculation of MoM matrix entries. When both rho = rho' and phi = phi', series representation of the spectral domain Green's functions do not converge, therefore closed-form Green's functions can not be employed. In that case MoM matrix e...
EFFICIENT SOLUTIONS OF METAMATERIAL PROBLEMS USING A LOW-FREQUENCY MULTILEVEL FAST MULTIPOLE ALGORITHM Ergül, Özgür Salih (EMW Publishing, 2010-01-01) We present fast and accurate sloutions of electromagnetics problems involving realistic metamaterial structures using a lowfrequency multilevel fast multipole algorithm (LF-MLFMA). Accelerating iterative solutions using robust preconditioning techniques may not be sufficient to reduce the overall processing time when the ordinary high-frequency MLFMA is applied to metamaterial problems. The major bottleneck, i.e., the low-frequency breakdown, should be eliminated for efficient sloutions. We show that the co...
CBFEM-MPI: A Parallelized Version of Characteristic Basis Finite Element Method for Extraction of 3-D Interconnect Capacitances Ozgun, Ozlem; Mittra, Raj; Kuzuoğlu, Mustafa (Institute of Electrical and Electronics Engineers (IEEE), 2009-02-01) In this paper, we present a novel, non-iterative domain decomposition method, which has been parallelized by using the message passing interface (MPI) library, and used to efficiently extract the capacitance matrixes of 3-D interconnect structures, by employing characteristic basis functions (CBFs) in the context of the finite element method (FEM). In this method, which is Failed CBFEM-MPI, the computational domain is partitioned into a number of nonoverlapping subdomains in which the CBFs are constructed b...
Hybrid connection of RF MEMS and SMT components in an impedance tuner Unlu, Mehmet; Topalli, Kagan; Atasoy, Halil Ibrahim; Demir, Şimşek; Aydın Çivi, Hatice Özlem; Akın, Tayfun (Elsevier BV, 2010-01-01) This paper presents a systematic construction of a model for a hybrid connected RF MEMS and SMT components in a reconfigurable impedance tuner. The double stub hybrid impedance tuner which employs a high number of MEMS switches is selected to demonstrate the feasibility of the connections. In the hybrid tuner, MEMS switches are actuated with DC bias signals, where SMT resistors de-couple RF from the DC lines. The hybrid tuner is realized in two steps, where the MEMS impedance tuner is fabricated on a glass ...

Citation Formats

O. Ozgun and M. Kuzuoğlu, “Transformation Electromagnetics Based Analysis of Waveguides With Random Rough or Periodic Grooved Surfaces,” IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, pp. 709–719, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48712.