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ANALYSIS OF DIPOLE ANTENNA RADIATION PATTERNS USING LOW FREQUENCY MODEL
تحليل أنماط الإشعاع لهوائي ثنائي القطب باستخدام نموذج التردد الواطئ

Author: Mahmood Ali Ahmed Dham
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2016 Volume: 20 Issue: 3 Pages: 129-138
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Antennas are an extremely vital element of communication systems and radar technologies. The antenna will produce radiation dispersed in space in a definite way when a signal is feed into an antenna, which called a "radiation pattern". Most pervious literatures concentrates on studying the effect of an EM filed on communication systems that have high frequency and its radiation pattern on far filed. The main aim of this paper is in order to investigate the effect of the electromagnetic EM-field in communication systems that have low frequency, and using the MATLAB software simulation in order to show this effect to describe the radiation pattern for an antenna on far field for different low frequencies due to the lack literatures that focus on this field. A dipole antenna is analyzed using the radiation pattern on far field for different low frequencies model within the frequency band of 1-5 KHz, to make the final design realizable.

الهوائيات عنصر حيوى للغاية من انظمة الاتصالات وتكنولوجيا الرادار. ينتج الهوائى الاشعاع فى الفضاء بشكل محدد عند تغذية اشارة الى هوائى ما ويدعى "نمط الاشعاع". وتركز معظم االدراسات السابقة بشان دراسة اثر الاشعاع الكهرومغناطيسي قي انظمة الاتصالات ذات الترددات العالية و التي تكون بنمط اشعاع المجال البعيد. الهدف الرئيسي من هذا البحث هو من اجل التحقيق فى تاثير التداخل الكهرومغناطيسى فى انظمة الاتصالات ذات التردد المنخفض واستخدام برامج المحاكاة ماتلاب لاظهار ذلك لوصف نمط الاشعاع للهوائى فى المجال البعيد ذات الترددات المنخفضة بسبب الافتقار الى الدراسات التى تركز على هذا المجال .باستخدام وتحليل هوائى نوع الدايبول بنمط اشعاع المجال البعيد لمختلف الترددات المنخفضة داخل نطاق التردد من 1 الى 5 كيلوهرتز لجعل التصميم النهائى يمكن تحقيقه عمليا.


Article
Investigate and Analyze the Electromagnetic Field Levels Inside Electric Power Substation

Authors: Kamil Jadu Ali --- Ghanim Thiab Hasan --- Mahmood Ali Ahmed
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2017 Volume: 24 Issue: 3 Pages: 12-17
Publisher: Tikrit University جامعة تكريت

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Abstract

Electric power transformers are a very important part of modern electric power and transmission line network systems and they consider as a high level source of electromagnetic fields which can affect the health of workers in station. In this research, electric and magnetic fields caused due to the operation of power distribution substation of 132/33 kV are investigated in order to avoid the overexposure of these fields to workers. Research has been conducted on both the mathematical calculations and practical measurements. The intensities of electric and magnetic fields have been measured at substation by EMF tester device. Safe zones from some equipment have been determined. Comparison the obtained results with the standard safety guideline limits shows that they are within the acceptable limits.

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