Analytical modeling and design of slotted EBG structure for wireless antenna performance enhancement

Abstract

Modern wireless communication systems impose several performance constraints on antenna size gain correlation levels and frequency of operation This has motivated antenna researchers to model and develop optimized antenna structures that meet these stringent requirements The design of antennas using Electromagnetic Band Gap EBG structures is one of the novel options to achieve enhanced antenna performance This thesis aims at analytical modeling and design of a compact novel EBG structure suitable for wireless antenna applications Compactness is the most important criterion in the design of recent wireless communication devices In this thesis a compact novel modified mushroom EBG structure the slotted EBG structure that can be used in wireless antennas is proposed Its dispersion characteristics is studied to prove its performance compared to the conventional mushroom EBG structure An analytical modeling technique is required to achieve faster first pass design So a computationally efficient surrogate modeling based Response Surface Methodology RSM is used to mathematically model the slotted EBG structure for antenna performance improvement Among the emerging wireless communication systems Multiple Input Multiple Output MIMO antenna systems is one of the most promising wireless technologies which support high channel capacity with improved data rates In this thesis an attempt has been made to enhance the performance of a two element microstrip MIMO antenna array by reducing mutual coupling between the antennas Slotted EBG structures are introduced in between the antenna elements for its surface wave suppression and their impact on the performance of MIMO antenna is experimentally evaluated Response surface methodology RSM is used to analytically model the slotted EBG structure for its optimized design newline