پديد آورنده :
زنده بودي، مجتبي
عنوان :
طراحي، شبيه سازي و ساخت آنتن چاپي و بهبود عملكرد آن با استفاده از ساختار متناوب الكترومغناطيسي
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر
صفحه شمار :
شانزده،113ص.: مصور،جدول،نمودار(رنگي)
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
ابوالقاسم زيدآبادي نژاد
توصيفگر ها :
آنتن هاي ميكرواستريپ , ساختارهاي باند توقف انرژي , موج سطحي , نمودار پاشندگي
تاريخ نمايه سازي :
18/3/93
استاد داور :
ذاكر حسين فيروزه، محسن مداح علي
دانشكده :
مهندسي برق و كامپيوتر
چكيده انگليسي :
Design and simulation of printed antennas with performance improvement by electromagnetic band gap EBG Mojtaba zendeboodi m zendeboodi@ec iut ac ir Date of submission 2014 1 13 Department of Electrical and Computer ngineering E Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Abolghasem zeidaabadi Nezhad zeidabad@cc iut ac ir Abstract Microstrip antennas are widely applicable due to their special properties such as compact structure low weight being cheap simplicity of applications and being integrated to printed circuit boards In addition to these advantages they suffer from some defects such as low bandwidth and low gain These defects are mainly because of existence of surface waves There are various solutions to lower the harmful effects of surface waves One of such ways is to create a band gap structure around the antenna in order to omit the surface waves In these structures there is a band gap out of dispersion relation This band gap has a straight relationship with structure parameters In this band the structure avoids the propagation of surface waves and enhances the performance of the antenna Till now different types of band gap structures with different shapes are offered and designed to omit surface waves in different frequency bands In this thesis a novel structure of band gap structures is proposed and it is analyzed both analytical and numerical The proposed structure is composed of two insulator layers in which the band gap structure is located at top of them Dimensions are chosen so that the surface waves trap into the top layer in which EBG structure exists and deleted The height of the lower layer is used for optimization of the structure The EBG bandwidth is considered as a variable in this scheme since EBG structure parameters is under our control and don t depend on the main antenna structure So changing the EBG structure parameters we are able to shift the frequency band to somewhere compatible with main antenna characteristics Finally we make an antenna with circular polarization In this thesis main characteristics of antenna such as gain bandwidth and side lobe are investigated Keywords 1 Band gap structure 2 Surface wave 3 dispersion relation
استاد راهنما :
ابوالقاسم زيدآبادي نژاد
استاد داور :
ذاكر حسين فيروزه، محسن مداح علي
