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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.


Article
A Multiband Fractal Dipole Antenna for Wireless Communication Applications
هوائي ثنائي القطب متعدد النطاق الترددي للاتصالات النقالة

Authors: Jawad K. Ali --- Essam M. Abdul-Baki --- Mahir H. Hammed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2010 Volume: 28 Issue: 10 Pages: 2043-2053
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

mmunication applications. The proposed fractal antenna design is based onfractal geometry of the second level tent function transformation. Due to theresulting geometrical structures of a fractal tent function curve depend on thestarting angles of the initial tent function, many dipole antennas have beenmodeled and the corresponding radiation characteristics have been evaluated.Theoretical performance of these antennas has been calculated using the methodof moments (MoM) electromagnetic simulator, IE3D. Simulation results of manytent fractal dipole antennas which have been modeled show that all of theseantennas have multiband resonate behavior, but this resonate behavior is differentaccording to the starting angle for each antenna. The results have shown that theseantennas have acceptable performance for VSWR ≤ 2 (return loss ≤ -10 dB),using a 50W feed line, at most of the resonating frequencies. This feature providesantenna designer with more degree of freedom, and makes the proposed antenna(or its monopole counterpart) suitable for use in the modern multi-functionscommunication systems

من النوع ثتائي (multiband) في هذا البحث يتم استعراض هوائي متعدد النطاق التردديللإستعمال في تطبيقات الاتصالات اللاسلكية . إن ( printed dipole antenna ) القطب المطبوعلتحويلِ دالة ( fractal geometry) تصميم الهوائي المقتَرحِ مستند على اساس الترتيب الهندسي الجزئيgeometrical ) من المستوى الثاني. وبسبب كون الاشكال الهندسية (tent function) الخيمةالناتجة عن منحني دالة الخيمة الجزئي تعتمد على زوايا البدء لدالة الخيمة ، تم نمذجة (structuresالعديد من الهوائيات ثنائية القطب وجرى حساب مواصفات البث الخاصة بكل منها. تم حساب الأداءوالتي تستند في اجراء التقييم . IE3D النظري لهذا الهوائي باستخدام الحقيبة البرمجِية المتوفرة تجارياأظهرت نتائج المحاكاة للعديد من الهوائيات ثنائية . (MoM) باسلوب المحاكاة على طريقةايجاد العزومالقطب الجزئية التي جرت نمذجتها بان جميع هذه الهوائيات تمتلك سلوك رنينياً متعدداً غير ان هذاالسلوك الرنيني يكون مختلفاً بحسب زاوية البدء الخاصة بكل هوائي. كما اظهرت النتائج بإن هذهVSWR ≤ الهوائيات تكون ذات اداء مقبول لقيمة 250 ، عند غالبية ترددات الرنين. باستخدام خط تغذية ذي ممانعة بقيمة ،(return loss ≤ -10 dB)تزود هذه الميزة مصمم الهوائي بالدرجة الاكثر من الحرية في التصميم وهذا يجعلُ الهوائي ثنائي القطبمناسبا للإستعمالِ في أنظمة الاتصالِ متعددة الوظائفَ (monopole المقترح (أَو نظيره الاحادي القطبالحديثةَ


Article
Frequency Reconfigurable Monopole Antenna Using Switchable Slotted Triangular Radiators

Authors: Fayyadh H. Ahmed --- Bayez K. Al-Sulaifanie
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 2 Part (A) Engineering Pages: 185-195
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

A new configuration of multi-state switchable wideband /multi-narrowband is demonstrated. The proposed antenna is based on a printed rectangular monopole antenna (PRMA) that covers wideband 3.3 GHz WiMAX frequency range. To generate a multi-state switchable antenna, center part of PRMA has been removed without distorting the PRMA behavior. Three PIN diode switches are used to control different operating modes. Eight-operating modes, 2n modes (n is number of switches) are achieved by setting the switches ON or OFF. Initial results were obtained by using short and open circuits instead of implanting PIN diode. The merit of the antenna design is that it allows various groups of its operating frequency bands to be selected using different switches states. Therefore, by selecting different antenna modes, a variety of communication systems can be conveniently served by only one antenna. The designed antenna has a simple planar structure and compact size of 30×50 mm2. Simulation and measured results show that realized gain in all operating bands is varied from -1.1 to 5 dBi. The proposed antenna demonstrates good impedance matching, stable radiation pattern and reasonable gain at all frequency bands. Simulation results have been obtained from commercial CST-2014 Microwave Studio. The antenna is fabricated and tested using R&S ZVL 13 Vector Network Analyzer (VNA). There are accepted results between the prototype and the simulated one.

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