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

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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

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Vol. 31 No. 4 (2009): العلوم الهندسية

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