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Article
Design of Compact Dual-band Antenna for 4G LTE Wireless Devices

Author: Ali J. Salim
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 6 Part (A) Engineering Pages: 1194-1206
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this paper, the planar dual-band monopole antenna is presented for Long Term Evolution (LTE) and Wireless Local Area Network (WLAN) applications. The design of the proposed antenna is based on Peano fractal curve and meander line structures. The antenna operates in 1.71 GHz to 2.01 GHz in the desired LTE frequency band and 5.0 GHz to 5.5GHz band (IEEE 802.11a band). The frequency band 1.71 - 2.01 GHz is already available as a study of the current plan according to UMTS and LTE systems (the band no.4). The antenna has been fixed on a substrate boardArlon with εr= 2.33 and thickness of 0.9 mm. Simulation results shows that the proposed antenna has promising radiation characteristics and a reasonable gain of 2.155 dBi at the lower band and 4.772 dBi at the upper band. The simulation and evaluation of antenna performance werecarried out using Microwave Studio Suite of Computer Simulation Technology CST.


Article
A New Compact Dual-band Antenna Based on Sierpinski Curve Slotted Ground Plane and Current Distribution Analysis

Author: M.T. Yassen
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 4 Part (A) Engineering Pages: 406-410
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

A new design approach has been used to achieve a dual band response from a multi-band resonance. The design approach is wholly depending on current distribution analysis on the surface of a multi-band antenna. The proposed multi-band antenna consists of a slotted ground plane with a simple 50-ohm microstrip feed line on the other side of an FR4 substrate having 4.4 relative dielectric constant and 1.6 mm thickness. The geometry of the first iteration Sierpinski curve fractal has been employed to the slotted ground plane antenna structure. Two small squares have been inserted to both internal upper corners of the slotted ground plane as a technique to control the path of electrical current on the surface of the multi-band antenna. With this technique, the resulted antenna can offer two resonating bands with respect to -10 dB S11. The first band (2.28-2.6) GHz, while the second band (5-5.58) GHz. The proposed antennas have been modeled and simulated using two softwares (CST Microwave Studio and High-Frequency Structure Simulation HFSS) to verify the results of both antennas and the other antenna parameters have been studied by using CST only.


Article
Design of Dual Band Circular Polarization Stacked Microstrip Antenna for GPS Applications
تصميم هوائي شريحة رقيقة متكدس ثنائي الحزمة ذو استقطاب دائري لاستخدامه في النظام العالمي لتحديد المواقع

Authors: Dr. Yessar E. Mohammed Ali د. يسار عزالدين محمد علي --- Ahmed J. Abdul Qader احمد جميل عبدالقادر
Journal: AL Rafdain Engineering Journal مجلة هندسة الرافدين ISSN: 18130526 Year: 2014 Volume: 22 Issue: 3 Pages: 225-232
Publisher: Mosul University جامعة الموصل

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Abstract

AbstractIn this paper dual-band microstrip antenna for Global Positioning System (GPS) application is designed.This design contents on two circular patch ( upper circular patch, lower circular patch) printed on a two-layer substrate of an FR4 dielectric layer, and cutting a crossed-slot in the upper patch and four I slots in the lower patch.The antenna can work at GPS Ll band (1.575GHz) and L2 band (1.227GHz).The design achieved an approximately impedance bandwidth of 15.8 MHz for L1 for two ports, while L2 band is 11.8 MHz for two ports with maximum gain of 2.54dBi and 1.177dBi in the L1 and L2 band respectively for two ports.The resulting circular polarization (with axial ratio ≤ 3 dB) has been found to meet that required for this application.The VSWR is approximately1.1 (VSWR ≤ 2) for L1 and 1.2 for L2.Results were obtained above using the software CST, which shows that this antenna can meet the demands of the signals of satellite navigation system.The antenna dimensionsare (70*70 mm2). The structure is compact and has a good application prospect. The results with low-profile characteristics make the antenna suitable for GPS applications.Keywords: microstrip antenna, GPS antenna, Circular polarization, dual-band antenna, Global Positioning System.

الخلاصة:في هذا البحث تم تصميم هوائي الشريحة الرقيقة ثنائية الحزمة لاستخدامه في النظام العالمي لتحديد المواقع. يحتوي هذا التصميمعلى طبقتين من الرقعة الدائرية (رقعة دائرية علوية, رقعة دائرية سفلية) مطبوعتين على طبقتين من المادة العازلة نوعFR-4وفيها قطع على شكل اشارة (+) في مركز الرقعة العلوية من الهوائي , وأربعة قطوع على شكل حرفI في الرقعة السفلية من الهوائي. الهوائي يعمل عند الترددين1.227 GHz1.575GHz &في هذا التصميم تم الحصول على عرض حزمة في كل حزمة متساوية تقريبا ولكلتا نقطتا التغذية حيث ان عرض الحزمة للحزمة الاولى هي MHz 15.8وللحزمة الثانية هيMHz11.8, كما تم تحقيق خاصية الاستقطاب الدائري لهذا التصميم حيث حصلنا على (≤ 3dBAxial Ratio) وايضا تم الحصول على نسبة الفولتية الواقفة كالاتي ( 1.1 للحزمة الاولى و 1.2 للحزمة الثانية).تم الحصول على النتائج اعلاه باستخدام برنامج CST والذي يبين ان هذا الهوائي جيد الاستخدام لاستقبال اشارات الاقمار الصناعية الملاحية . تم تصغير ابعاد الهوائي, والنتائج المبينة يقود الى ان هذا الهوائي مناسب لتطبيقات النظام العالمي لتحديد المواقع.


Article
A New Compact Dual Band GPS Patch Antenna Design Based on Minkowski-Like Pre-Fractal Geometry
تصميم جديد لهوائي شرائط دقيقة مدمج ثنائي الحزمة بالاعتماد على شكل منكوفسكي ما قبل الجزئي لمحدد الموقع العالمي

Author: Mohammed Fadhil Hasan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2009 Volume: 27 Issue: 7 Pages: 1370-1375
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

A low profile compact microstrip antenna for GPS (L1/L2) application has beenpresented in this paper. The proposed antenna design is based on the 3rd iterationMinkowski-like pre-fractal geometry. The resulting antenna design offers a compact size,low profile and light weight making it suitable for use in handheld applications. Antennaperformance has been evaluated using the EMSightTM from the Applied Wave Research.The proposed antenna has shown to possess two resonance bands (for return loss .-10dB) covering the two GPS bands. Reasonable radiation characteristics have been achievedat the GPS frequencies (L1:1575.42 } 10.23 MHz, L2:1227.60 } 10.23 MHz) with goodcircular polarization characteristics. Realized circular polarization Bandwidths (for axialratio . 3 dB) are found to cover adequately those required for these GPS bands.

قدم في هذا البحث. (L1/L في تطبيقات ( 2 GPS هوائي الشرائط الدقيقة صغير الواجهة للالتصميم المقترح للهوائي يعتمد على التكرار الثالث لشكل منكوفسكي الجزئي. التصميم الناتج يعطيحجم صغير, واجهة صغيرة ووزن قليل مما يجعله ملائماً للتطبيقات اليدوية. الهوائي المقترح أظهر أنتم انجاز ميزات إشعاع .GPS تغطي حزمتي ال (dB لديه حزمتي رنين (لخسائر رجوع ≤- 10مع (L1:1575.42 ± 10.23 MHz, L2:1227.60 ± 10.23 MHz) GPS معقولة في ترددي ال(dB ميزات استقطاب دائري جيدة. وجد أن حزمتي الاستقطاب الدائري المتحققة (لنسبة محورية ≤ 3.GPS تغطي بشكل مناسب الحزم المطلوبة لل


Article
Fabrication and Performance Evaluation of a Fractal- based Slot Printed Antenna for Dual-band Wireless Applications

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Abstract

Abstract – Different fractal geometries are successfully applied to design compact size printed and microstrip antenna structures for multiband and dual-band wireless communication applications. In this paper, a printed antenna with fractal based slot structure is presented as a candidate for use in dual-band wireless applications. The slot structure of the proposed antenna is with circle based fractal geometry. The slot structure has been etched in the ground plane of an FR4 substrate with relative dielectric constant of 4.4 and 1.6 mm thickness and on the reverse side a microstrip line has to be printed as a 50 Ω feed. Simulation results of the modeled antenna show that it offers a dual-band resonant behavior with a considerable resonant frequency ratio; covering a wide variety of wireless applications. Modeling and performance evaluation of the resulting antenna are carried out using the commercially available EM simulator HFSS, from Ansoft Corporation. A parametric study reveals that the proposed antenna offers fractional bandwidths of about 13% to 27% for the lower resonant band and 7% to 28% for the upper resonant band. The corresponding gain throughout these bands varies from 2.53 to 3.58 dB and from 4.08 to 5.76 dB respectively. This makes the antenna suitable for use in a wide variety of wireless applications. A fabricated prototype of the proposed antenna shows a return loss response which is in reasonable agreement with that theoretically predicted within the same swept frequency range. Furthermore, the proposed antenna exhibits good radiation characteristics at the resonant bands.Keywords – Fractal antenna; slot antenna; dual-band antenna; printed antenna; circle-based fractal geometry.

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