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Iraqi Journal of Applied Physics

المجلة العراقية للفيزياء التطبيقية

ISSN: 18132065 23091673
Publisher: iraqi society for alternative and renewable energy sources and techniques
Faculty:
Language: English

This journal is Open Access

About

The Iraqi Journal of Applied Physics (IJAP) is a peer reviewed journal of high quality devoted to the publication of original research papers from applied physics and their broad range of applications. IJAP publishes quality original research papers, comprehensive review articles, survey articles, book reviews, dissertation abstracts in physics and its applications in the broadest sense. It is intended that the journal may act as an interdisciplinary forum for Physics and its applications. Innovative applications and material that brings together diverse areas of Physics are particularly welcome. Review articles in selected areas are published from time to time. It aims to disseminate knowledge; provide a learned reference in the field; and establish channels of communication between academic and research experts, policy makers and executives in industry, commerce and investment institutions. IJAP is a quarterly specialized periodical dedicated to publishing original papers, letters and reviews in: Applied & Nonlinear Optics, Applied Mechanics & Thermodynamics, Digital & Optical Communications, Electronic Materials & Devices, Laser Physics & Applications, Plasma Physics & Applications, Quantum Physics & Spectroscopy, Semiconductors & Optoelectronics, Solid State Physics & Applications, Alternative and Renewable Energy, Computers Networks and Applications.

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Contact info

P. O. Box 55259,
Baghdad 12001,
Iraq
Website: www.iraqiphysicsjournal.com
Email: admin@iraqiphysicsjournal.com
Email: editor_ijap@yahoo.co.uk

Table of content: 2009 volume:5 issue:4

Article
A New Miniature Narrowband Microstrip Bandpass Filter Design Based on Peano Fractal Geometry

Authors: J.K. Ali --- Y.S. Mezaal
Pages: 3-9
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Abstract

A new compact narrowband multiresonator microstrip filter design is presented in this paper as a candidate for use in modern wireless communication systems. The proposed filter structure is generated using Peano fractal curve geometry. The proposed filter structure is fractally generated using Peano fractal curve geometry. Two 2nd and 4th order Chebyshev bandpass filters have been designed based on the 2nd iteration Peano fractal curve at a design frequency of 2.45GHz using a substrate of a relative dielectric constant of 9.6 and thickness of 0.508 mm. Filter structures based on the second iteration Peano geometry leads to compact size single mode resonators with dimensions of about (0.075×0.086)λg. This article represents better miniaturization level compared with the other microstrip bandpass filters based on other space-filling geometries and designed at the same frequency using the same substrate material specifications. Simulation and theoretical performance of the resulting filter structures have been carried out using method of moments (MoM) based electromagnetic simulator IE3D, from Zeland Software Inc. The results also show that the proposed filter structures possess good return loss and transmission responses besides the size reduction gained, making them suitable for use in a wide variety of wireless communication applications.


Article
Analytical Equivalent Circuit of High-Irradiated Conventional Silicon Solar Cell Performance

Authors: H.S. Dawood
Pages: 11-15
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Abstract

In this study the current–voltage characteristics of a conventional silicon solar cell were studied. The experimental examination is carried out under a high concentration of light. The variations of the two reverse saturation currents are consistent with the physical significance of both the diffusion and the space-charge generation-recombination terms through their exponential variations. The simulation results clearly demonstrated that the solar cell is described with reasonable accuracy by a two-diode equivalent model that simulates the effects of the double-exponential dark current–voltage characteristics on the open-circuit voltage, fill factor, and conversion efficiency of the solar cell at a high concentration. The theoretical results are in good agreement with the experimental observations.


Article
Comparison of the Radiation Characteristics of Triangular and Quadratic Koch Fractal Dipole Wire Antennas

Authors: F.J. Jibrael --- Z.F. Mizeel
Pages: 17-21
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Abstract

In this paper, a small size, low profile and multiband triangular and quadratic Koch curve dipole antenna are presented. The proposed antennas design, analysis and characterization had been performed using the method of moments (MoM). The designed antennas have operating frequencies of 603MHz, and 1789MHz for triangular Koch dipole antenna and 460MHz and 1262MHz for quadratic Koch dipole antenna. The radiation characteristics, reflection coefficients, VSWR, gain, and input impedance of the proposed antennas are described and simulated using the 4NEC2 software package.


Article
Duffing Chaotic Laser Resonator

Authors: M. Wilson --- M. Huicochea
Pages: 23-26
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Abstract

In this work we show, from the dynamical point of view, how an optical device in a ring resonator can generate a Duffing map for the ray parameters. The resonator is analyzed and the elements of the matrix [a, b, c, e] representing the chaos generating device are found in terms of both, the cavity and the Duffing map parameters. The recurrence relations of the chaotic Duffing map are used to obtain the expressions that describe the ray after the n-th round trip. The characteristic dynamics of the Duffing chaos generating element are discussed and the matrix elements [a, b, c, e] of the chaos generator device are presented.

Keywords

Chaos --- Duffing --- Resonator


Article
Temperature Dependency of Hall Coefficients in Cadmium Oxide Thin Films Prepared by Thermal Evaporation Technique

Authors: H.M. Mikhlif --- A.M. Raouf --- A.D. Nusaif
Pages: 27-30
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Abstract

In this work, the temperature dependencies of Hall coefficients in cadmium oxide thin films prepared by thermal evaporation technique. These coefficients included temperature-dependent Hall coefficient, logarithmic Hall coefficient and Hall mobility. Results showed that the extrinsic conduction prevails in studied samples and impurity atoms introduce energy levels within the energy gap and act as donors. The activation energy of the impurities generally ranged between 0.020eV and 0.070eV. An increase of carrier mobility with temperature was observed then it decreased in higher temperature due to lattice scattering of charge carriers. The values of optical bandgap ranged between 2.90eV and 3.30eV, which is in a good agreement with the those obtained for bulk CdO:Sn samples.


Article
Analytical Treatment to Minimize the Aberration in Concentric Lenses Employed in High-Power Irradiation Applications

Authors: N.I.E. Alrawi --- J.A. Olaiwi
Pages: 31-35
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Abstract

In this work, an analytical treatment to minimize the aberration (especially spherical) in concentric lenses was presented. The lenses concerned in this treatment are supposed to be graded-indexed optical elements of homogeneous surfaces. Spherical aberration is, contradictive to other types of aberrations, found possible to be eliminated in such optical elements as it is highly interested in high-power irradiation applications like laser-plasma interaction, microfabrication and fine-scaled metrology.

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