Antenna (Feed)‎ evaluation based on beam efficiency-application development for radio-astronomy

مقدم أطروحة جامعية

Laghlid, Yasini

مشرف أطروحة جامعية

Harrud, Hamid
Darhamawi, Hassani
Leech, Jamie
Chamcham, Khalil
Yasin, Ghassan

أعضاء اللجنة

Abbu, Fuad Muhammad

الجامعة

جامعة الأخوين

الكلية

كلية الهندسة و العلوم

القسم الأكاديمي

هندسة البرمجيات

دولة الجامعة

المغرب

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2013

الملخص الإنجليزي

A radio telescope is an astronomical instrument consisting of a radio receiver and an antenna system that is used to detect radio frequency radiation between wavelengths of about 10 metres (30 megahertz [MHz]) and 1 mm (300 gigahertz [GHz]) emitted by extraterrestrial sources, such as stars and galaxies.

Using radio telescopes equipped with effective and efficient components allows astronomers to answer some perplexing questions about our universe creation that are still pending.

Since radio waves penetrate dust, scientists use radio astronomy techniques to study regions that cannot be seen in visible light, such as the dust shrouded environments where stars and planets are born, and the center of our Galaxy, the Milky Way.

Radio waves also allow astronomers to trace the location, density, and motion of the hydrogen gas that constitutes three fourths of the ordinary matter in the Universe.

Sasao and Fletcher (2009) pinpointed that the performance of a radio wave antenna is characterized by a number of important parameters which are mainly discussed in the specifications of antennas.

These performance parameters include: aperture diameter, surface accuracy, antenna reference point, antenna gain, antenna directivity, beam efficiency, to name just a few.

Efficiency is arguably the most important performance parameter.

Efficiency is simply a measure of what portion of the power supplied to the antenna, including any reflection loss, is actually radiated by the antenna.

However, most research papers in the literature focus on concepts such as antenna gain and directivity and ignore the aspect of antenna beam efficiency even though it is one of the characteristics that prove the performance of antennas.

Hence, the need for research and algorithms analyses and development of the beam efficiency is mandatory.

The goal of this dissertation is to provide insights into how the beam efficiency can be implemented and integrated into the GRASP package which is an industry standard for modeling of antennas.

Our approach is based on developing and testing algorithms that will allow measuring the beam efficiency of antenna feeds.

Developing these algorithms will require the help of numerical integration as a strong field.

Next, this project will be based on understanding the output files from GRASP and providing a way that allows the integration between GRASP and the algorithms developed.

The results of this work indicate certain precise algorithms for calculating the beam efficiency.

Second, they show how to manipulate the cut files generated by GRASP and to transform them into useful information that would allow calculating the beam efficiency of certain antenna horns.

التخصصات الرئيسية

العلوم الهندسية والتكنولوجية (متداخلة التخصصات)

عدد الصفحات

122

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-646481