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Article
Design and Analysis of Special Small Size Cross Dipole Antenna

Author: F.J. Jibrael
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2010 Volume: 6 Issue: 2 Pages: 19-23
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In this paper, a crossed dipole antenna combined with the quadratic Koch curve geometry, which has a novel configuration, is proposed and investigated for low profile and multi-band performance in communication systems. The proposed antenna has operating frequencies of 1.543GHz, 2.537GHz, 3.038GHz, 3.469GHz and 3.769GHz. The field pattern of the proposed antenna is described and simulated in the three planes: XZ-plane, YZ-plane, and XY-plane. The radiation characteristics, VSWR, reflection coefficients, and input impedance of the proposed antenna are described and simulated using the 4NEC software package.


Article
A Novel Multiband and Small Size Patch Microstrip Fractal Antenna for Wireless Applications

Authors: M.H. Hammed --- F.J. Jibrael
Journal: Iraqi Journal of Applied Physics Letters الرسائل العراقية في الفيزياء التطبيقية ISSN: 1999656X Year: 2009 Volume: 2 Issue: 4 Pages: 15-18
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

A novel compact Plusses fractal patch microstrip antenna is investigated to be an efficient scheme of miniaturization based on the simulation results, the proposed antenna has shown to possess an excellent size reduction possibility with good radiation performance for wireless applications. The new designed antenna has an operating frequency of 2.46 GHz, 6.58 GHz, and 9.2 GHz, with acceptable bandwidth and S11<-10 dB (VSWR<2). The radiation characteristics, VSWR, and S11 of the proposed antenna are described and simulated using microwave office MWO 2007 v7.5.


Article
Analysis and Design of Combined Fractal Dipole Wire Antenna

Authors: F.J. Jibrael --- H.A. Hammas
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2009 Volume: 5 Issue: 2 Pages: 29-32
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

This paper presents the analysis and design of a small size, low profile and multiband combined fractal Koch dipole antenna. The proposed antenna design, analysis and characterization have been performed using the method of moments (MoM) technique. The new designed antenna has operating frequencies of 440MHz, 1194MHz, and 5272MHz with acceptable bandwidth, which has useful applications in communication systems. The radiation characteristics, VSWR, reflection coefficient, and input impedance of the proposed antenna are described and simulated using 4NEC2 software package. Also, the gain of this proposed antenna is calculated and described in the three planes: XZ-plane, YZ-plane, and XY-plane, where the antenna is placed in the YZ-plane.


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

Authors: F.J. Jibrael --- Z.F. Mizeel
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2009 Volume: 5 Issue: 4 Pages: 17-21
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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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
Dipole Antenna with Fractal Koch Curve Geometry for Multiple Frequency Applications

Authors: A.A. Sabri --- F.J. Jibrael --- S.D. Sateaa
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2011 Volume: 7 Issue: 2 Pages: 3-9
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

This paper presents the analysis, simulation, and design of a small size, low profile, multi-band third iteration quadratic Koch fractal dipole antenna. The proposed antenna design, analysis and characterization have been performed using the method of moments (MoM) technique. The new designed antenna has operating frequencies of 960 MHz, 1514 MHz, 2914 MHz, 3274 MHz, and 3480 MHz with acceptable bandwidth, which has useful applications in wireless communication systems, and at these frequencies the proposed antenna has reflection coefficient < -10 dB (vswr < 2). The radiation characteristics, vswr, gain, radiation efficiency, and reflection coefficient of the proposed antenna are described and simulated using 4nec2 software package.

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