هوائي مكسر عريض المجال دائري الشكل مسطح

Authors

  • معين يونس

Abstract

توصف الهوائيات المكسرة Fractal antennas  من خلال خواصها الهندسية ، والتي تسمح بتقليل أبعاد الهوائي . ولها خواص مميزة تجعلها مرشحة للاستخدام في التطبيقات التي تتطلب عرض مجال واسع ، وتعمل عند مجالات ترددية مختلفة  وذات ممانعة دخل تؤمن قيم صغيرة لنسبة الأمواج المستقرة عند دخلها لمجالات عملها المختلفة .

تستعرض هذه المقالة تصميم  وتحليل هوائي رقعي أو مطبوع  وحيد القطب مسطح ومدمج عريض المجال الترددي . يُقترح تركبيه على العربات  ويناسب الاتصالات المتنقلة . تم تصميم الهوائي المكسر المفروض أن يحقق فقد ضياع العودة أقل من- 10 dB  ,لكي يتحقق الشرط,   عند تصميم أي هوائي يجب أن تكون نسبة الأمواج المستقرة عند مدخل الهوائي أصغر أو يساوي 2 . بالإضافة إلى ذلك فإن شكل الهوائي يجب أن يحقق الشرط المطلوب في التصميم وهو قلة الوزن وتحمل الرياح .

تم تجريب و اختبار تغيير طول المغذي للهوائي لتحسين التصميم عند مجال واسع من الترددات ومقارنة هذا الهوائي مع الأنواع الأخرى ، حيث يشكل هذا النوع هوائياً عريض المجال ويعتبر نوعاً بديلاً عن الأنواع الأخرى عريضة المجال المكسرة .

استعمل البرنامج الكهرومغناطيسي HFSS   للتصميم الأمثلي لشكل الهوائي المفروض لكي يعمل عند أوسع مجال ترددي .

Fractal antennas are characterised by their special geometrical characteristics, which allow a reduction of the antenna dimensions. They have special properties that make them interesting candidates for applications where wide-band, multi-band, input impedance, SWR are important parameters of the overall performance.

This work presents the design and Analysis of a patch or printed circular ultra wideband mono pole fractal antenna, which is proposed for Vehicular applications and suitable for cellular telecommunications. The proposed fractal design is optimized for return loss below −10 dB,  to verify that condition for any antenna design , the ratio of the standing waves at the antenna input should be SWR . Moreover due to the fractal shape, the proposed design has less weight and wind loading effect. Many possibilities of improved design have been investigated by varying the length of the Feeder. In comparison to other Fractal antennas,  This type of structure can achieve larger bandwidth with proper design. It is an alternative to the other fractal antennas.

The electromagnetic software HFSS is used to design and optimize the structure of the proposed antenna which can operate in the frequency─ bands.

References

اGSCHWENDNER, E. Breitbandig Multifuktions Antennen für den konformen Einbau in Kraftfahrzeuge, Institut für Hochfrequenztechnik und Elektronik, Universität Karlsruhe (TH), 2001,191 .

WONG, K.L. Compact and Broadband Micro strip Antennas, John weley & sons , inc. 2003 , 335.

KUMAR ,G.; RAY, K.P. Broadband Micro strip Antennas , Artech House , inc. .415 , 2003

WATEWHOUSE ,R.B. Micro strip Patch Antennas, A Designer's Guide RMIT University Academic Publishers 2003 , 418 .

ALI ,M.; HWANG,H.S.; SITTIRONNARIT,T. Design and Analysis of an R-Shaped Dual-Band Planar Inverted-F Antenna for Vehicular Applications, IEEE Transactions on Vehicular Technology , Vol.53 , No. 1 , 1,Jan. 2004 , 29 – 37.

MURAD, N. A.; ESA, M.; YUSOFF, M. ; ALI, S. H. A. Hilbert Curve Fractal Antenna for RFID Application, International RF and MW Conference Proceedings, Putrajaya, Malaysia, September 12-14, 2006,182-185.

SARAMANIAM, K.; ESA, M.; SUBAHIR, S. Compact Printed Square Meander Loob Antenna for Bluetooth Headset , Proceeding of the 2005 Asia Pacific

Safwan AlAssaf, Towards Better Climatic Responses in Architectural and Urban Design, College of Architecture, Al Baath University,2002.

Safwan Assaf, An Intelligent Spatial Data Base for Strategic Housing Management, International Regional and Planning Studies / Middle East Forum, 1996, 41-61.

Safwan Assaf, Methods of Predicting Housing Requirements for Local Housing Policy in Syria , Beirut Arab University Publication, 1995,137-155.

Safwan Assaf, A Conceptual Model for housing Planning Information System‏, Arab Cities Organization (G.C.A.C.O) 10th, Dubai 3, 1994, 2475-2524‏.

Safwan Assaf, Data and Information requirements for Housing Planning‏, Arab Cities Organization (G.C.A.C.O) 10th, Dubai 3,1994, 2445-2473.

Safwan Assaf, Towards Better Climatic Responses in Architectural and Urban Design, College of Architecture, Al Baath University,2002.

Safwan Assaf, AN ADVICE UNIT FOR FORWARD HOUSING PLANNING (LHS). 1998.

Safwan Assaf, An Intelligent Spatial Data Base for Strategic Housing Management, International Regional and Planning Studies / Middle East Forum, 1996, 41-61.

Safwan Assaf, Methods of Predicting Housing Requirements for Local Housing Policy in Syria , Beirut Arab University Publication, 1995,137-155.

Downloads

Published

2019-04-27

How to Cite

1.
يونس م. هوائي مكسر عريض المجال دائري الشكل مسطح. Tuj-eng [Internet]. 2019Apr.27 [cited 2024Nov.23];31(4). Available from: https://journal.tishreen.edu.sy/index.php/engscnc/article/view/7164

Issue

Vol. 31 No. 4 (2009): العلوم الهندسية

Section

Articles

License

Copyright (c) 2019 ttps://creativecommons.org/licenses/by-nc-sa/4.0/

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

The authors retain the copyright and grant the right to publish in the magazine for the first time with the transfer of the commercial right to Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series

 Under a CC BY- NC-SA 04 license that allows others to share the work with of the work's authorship and initial publication in this journal. Authors can use a copy of their articles in their scientific activity, and on their scientific websites, provided that the place of publication is indicted in  Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series   .  The Readers have the right to send, print and subscribe to the initial version of the article, and the title of  Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series     Publisher

journal uses a CC BY-NC-SA license which mean

You are free to:

  • Adapt — remix, transform, and build upon the material
  •  
  • The licensor cannot revoke these freedoms as long as you follow the license terms.

 

  • Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • NonCommercial — You may not use the material for commercial purposes.
  • ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
  • No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.