Optimization Techniques in Electromagnetic Problems

Date Completed: August 05, 2003

The following papers are the results of a cooperation between me and Dr.Lotfi, the antenna and communications circuits labs instructor. My work, for the main part, was helping in the implementation of the optimization algorithms in the projects and also comparing the obtained results with the ones produced by HP-HFSS software. I also had the opportunity to consult with Prof. Hojjat Kashani ,my Antenna course instructor, in the areas of antennas and microwave devices. The results of the application of the mentioned optimization techniques to some electromagnetic problems are documented in the following papers.

Paper Abstracts:

###### Analysis and Optimization of a New Ultra Wide Band Antenna to be used in Wireless Communication

Abstract: -In this paper, various simulated annealing methods are proposed to increase the antenna bandwidth up to ultra wideband status. The “Simulated Annealing” term comes from the physical process of annealing metals, in which a metal is heated and then little by little cooled in order to form strong crystalline bonds within the structure. Bowtie and Inverse Bowtie antennas and their combinations are simulated using MoM and their bandwidths are increased using the optimization method of simulated annealing algorithm. Presented in:
EUROEM 2004, Euro Electromagnetics, 12-16 July 2004, Magdeburg, Germany
Authors: Neyestanak, A. A. L.; Kashani, F. H.; Khosroshahy, M.
Conference Program: Click here

###### Design and Optimization of a New Power Monitor with Small Size

Abstract: -This paper describes the theory of the operation of directional coupler and presents some information about designing a very flat coupling coefficient. A power monitor is designed and then optimized for UHF band using genetic algorithm with fractal coding. In this paper, a transformer element is used to obtain a very flat coupling factor and then it is fabricated and compared with experimental results. Using two elements and genetic algorithm optimization, an outstanding result in size and coupling factor has been achieved. The measured results of the optimized power monitor validate a high compatibility between the simulation and the real experience.

Presented in:
8th WSEAS International Conference on Communications, 12-15 July 2004, Vouliagmeni, Athens, Greece
Authors: Abbas Ali Lotfi Neyestanak, Ali Homaii, Masood Khosroshahy, Mohammad Mirhosaini
Conference Program: Click here



###### A New Optimization Approach in the Design of E-Shaped Patch Antenna

Abstract: -In this paper, the bandwidth of the E-shaped microstrip antenna is optimized using the genetic algorithm (GA) based on fuzzy decision-making. The method of moments is employed for analysis at the frequency band of 1.8GHz-2.6GHz by the optimization parameters of supply locations and slot dimensions. In the implemented fuzzy system, inputs are parameters like population, and outputs are parameters such as recombination to produce the next generation. Fuzzy inference system is used for the controlling of the genetic algorithm parameters. Simulation results show the high capability of genetic optimization based on fuzzy system and hence reaching a bandwidth of about 33.4%. The measured results of the optimized antenna validate a high compatibility between the simulation and the measurements.

Published in:
WSEAS Transactions on Mathematics, issue 1, Volume 3, January 2004
And presented in:
5th WSEAS International Conference on Applied Mathematics, 21-23 April 2004, Miami, Florida, USA
Authors: AbbasAli Lotfi Neyestanak, Farrokh Hojjat Kashani, Masood Khosroshahy
Journal's Table of Contents: Click here
Conference Program: Click here

Please Click here for getting the HP-HFSS v5.3 project files. (The solution has been deleted due to its large size, so one can open the project and examine the geometry and run the project again with the existing simulation settings for viewing and analyzing the solution in the HP-HFSS Post Processor)
 

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