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Register a new userTow Fractal (Van-Koch)Antenna Design, fabricate and measured work on 1 GHz and 10 GHz
تصميم و تصنيع و قياس هوائيين تجزيئيين (فان كوخ) يعملان على الترددين 1GHZ و 10GHZ
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تعتبر الهوائيات التجزيئية حالياً من أهم هوائيات الحزمة العريضة, نظراً لمعاملات التصميم التي تضيفها الهندسة التجزيئية على هذه الهوائيات. الطول اللانهائي بين نقطتين محددتين للهوائي التجزيئي و التشابه الذاتي الداخلي الذي يتميز به يقدمان هوائيات متعددة ترددات الرنين، عريض الحزمة، و يمكن أن تعمل على عدة تطبيقات بنفس الوقت. استخدام هوائي الدايبول السلكي على شكل منحني فان كوخ قدم عدة ترددات رنينية, تم تصميم هذا الهوائي باستخدام برنامج NEC ثم تم تصنيع التصميم المقترح عملياً و تم قياسه في مخبر الهوائيات و انتشار الأمواج على الترددين المركزيين 1GHz و 10GHz. النتائج العملية و النظرية متطابقة بدرجة جيدة جداً رغم ظروف التجربة غير المثالية. هذا التطبيق العملي للهوائي فان كوخ و القياس في مخبر الهوائيات يعطي إمكانية تصميم هذه الهوائيات و تنفيذها رغم الإمكانيات المحدودة في المخبر كما يمكن دراسة التغيرات التي تحصل على معاملات الهوائي من الربح و عرض الحزمة و ممانعة الهوائي عند تغيير المعاملات التجزيئية للهوائي المقترح بحيث نحصل على الهوائي الأمثل.
Fractal antenna are considered actually as the most important large band antenna, due to their design parameters that are based on fractal geometry. The long distance between two specific points of antenna and hisself similarity allow to obtain a multiple resonance frequencies (Wide Band), which is used for several application. The using of dipole antenna in form of Van-Koch curve offer multi-resonance antenna, the Nec simulator is used to design this antenna. The proposed antenna had been fabricated and measured in the antenna laboratory at two central frequencies 1GHz and 10 GHz. Both theoretical and experimental results were very closed in spite of imperfect experiment condition. The Van- Koch antenna fabrication and measurement in laboratory gives the possibility to designing and applying this antenna type, additionally we can study the change of antenna parameters ( gain, rayon diagram … ) when the fractal parameters varies.
References used
B,B, MANDELBROT, Les Objects Fractals forme Hasard et dimension, Paris: Flammarion, 1975, 1984, 1989
D.H. WERNER; A. R. BRETONES and B.R. LONG,” Radiation characteristics of thin-wire ternary fractal trees ,”Electronics Letters. Vol35, N°8, April 2001, pp.609- 611
D.H. WERNER; P.L. WERNER and K.H. Church, ”Genetically engineered multiband fractal antenna,” Electronics Letters. Vol37,September2003, pp.1150-1152
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