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Register a new userA fractal printed Antenna designing and measuring at 10GHZ
تصميم و قياس هوائي مطبوع تجزيئي على تردد 10GHZ
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أصبحت وسائل الاتصالات اللاسلكية حاجة أساسية في حياتنا العملية و تطورت بشكل سريع في العقود القليلة الماضية, تطلب ذلك تطور لأنواع الهوائيات المستخدمة. تم تصميم أنواع هوائيات جديدة كهوائيات الفتحة و الرقعة و الهوائيات العدسية و الهوائيات السلكية و في كل نوع تم ابتكار أشكال و تصاميم جديدة تهدف لتحسين الأداء و الربح و المردود و عرض الحزمة. يقترح هذا البحث تصميم و محاكاة هوائي تجزيئي مطبوع باستخدام Zeland, هذا النوع من الهوائيات يعتمد على الهندسة التجزيئية و تحديداً سجادة سربنسكي له مخطط اشعاعي جيد و يملك مجال واسع من التطبيقات. درست خصائص الهوائي التجزيئي المصمم بمساعدة المحاكي Zeland و تم تحليل التغيرات التي تطرأ على معاملات هذا الهوائي عند تغيير معاملات التجزيء كدرجة التجزيء مثلاً, و في النهاية تم تطبيق الهوائي المقترح عملياً و تم قياسه على الترددات التي سمح مخبر الهوائيات و الأمواج المكروية باختبارها كما رسم مخططه الإشعاعي, هذه الترددات 1GHZ و 10GHZ, و قد تم اختيار التردد 10GHZ.
The wireless communication devices became very important. They have been fastly developed fastly in the last few years, so, it was necessary to propose new types Antenna . A new printed patched Antenna design as, printed, a lenses and wire Antenna, are objected to improve the performance, gain and beam width of Antenna. This work propos a design and simuling of patch fractal Antenna, using Zeland. This type which depends on fractal geometry (sierpinski carpet) has a very good radiation pattern and has wide applications. The proposed Antenna parameters were studied by the help of Zeland simulator, The variation of the antenna parameters happens when the fractal parameters (as stage of growth) changes, were analysed. Finally, the proposed Antenna was praticly applied and measured at the frequency 10Ghz allowed by the microwave and Antenna laboratory.
References used
MANDELBROT,B.B. Les Objects Fractals forme Hasard et dimension, Paris: Flammarion, 1975, 1984, 1989
SHARONY,J. Introduction to Wireless MIMO -Theory and Application, November 15, 2006
PQULRAJ,M.A. MIMO Wireless Linear precoding, IEEE Signal Processing magazine, 24(5), 86-105m, 2007
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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 m
ultiple 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.
This article proposes a possible improvement for a printed logperiodic
dipole antenna (LPDA). The improvements makes the
antenna capable to operate over a multi frequency bands between
(0.5 – 12) GHz. This antenna has a small dimension suitable for any mobile application.
This paper illustrates a design of linear array antenna equal space and non uniform
excitation using Dolph – Chebyshev method , We will discuss the designing procedure
for antenna array having odd or even number of elements at two different values
of the
major to minor sidelobe level and at various between spaces , we will calculate the
excitation coefficients and plot the radiation pattern for each case in addition to calculate
both of the half power beam width angel and directivity. Finally : two curves will be
plotted : first of them for beam broadening factor as a function of the major to minor
sidelobe ratio ,the other one for directivity as a function of the array length.
Antennas have become an indispensable basic need, especially in the area of wireless
networks, and have developed in the past few decades in a very large way in terms of profit
and resistance, bandwidth, bandwidth, radiation pattern, etc. in line w
ith new and
increasing requirements.
In this study, we are interested in studying a broad band antenna where this antenna is very
important in systems that operate on a set of frequencies rather than at a fixed frequency.
The traditional antennas that are designed at a specific frequency change their response
significantly if used on a wide bandwidth around the designed frequency
In this study, the LPDA (Log periodic dipole Array) antenna was designed and studied in a
broadband field and compared to the antenna reference of wire antennas. It is a halfwavelength
antenna λ/2. The study of the effect of frequency change in the antenna
radiation pattern and the radiation beam Half-power level and front-to-back ratio (F/B).
this paper illustrates two methods of having a desired sectoral pattern using the
techniques of antenna synthesizing ,we will calculate the array excitation coefficients by
using Fourier transform and Woodward method , beside studying the effect of
increasing
the array elements on the desired radiation pattern and the side loop level at a constant
distance. Finally we will compare the results of the two methods showing their advantages
and disadvantages.
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