Design and Optimization of Broadband High Impedance Groupd Planes for Surface Mount Antennas

<p>Gain and bandwidth metrics of broad-band low-profile antennas severely deteriorate when they are placed conformally onto the conductive skins of air sea and ground platforms. This detrimental effect is primarily due to out-of-phase reflections from the conductive body interfering with the antenna's self radiation. Furthermore lateral waves launched by the antenna couple into the thin substrate placed between the antenna and the platform giving rise to surface waves resulting in significant diffraction from the edges of the substrate. To remedy these two major mechanisms degrading antenna performance high impedance ground planes (HIGP) were designed. HIGPs made of a 2-dimentional periodic arrangement of a mushroom structure not only provide perfect-magnetic-conductor (PMC)-like reflection but also suppress the surface waves within the stop-band of the substrate modes. This study presents new geometrical shape HIGP-antenna designs and optimizations. Dipole antenna log periodic antenna and finally bow-tie antennas are used in the study. Multi-scale HIGP and antenna designs are introduced in the final part of the thesis.</p><p>This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact and remains as true to the original work as possible. Therefore you will see the original copyright references library stamps (as most of these works have been housed in our most important libraries around the world) and other notations in the work.</p><p>This work is in the public domain in the United States of America and possibly other nations. Within the United States you may freely copy and distribute this work as no entity (individual or corporate) has a copyright on the body of the work.</p><p>As a reproduction of a historical artifact this work may contain missing or blurred pages poor pictures errant marks etc. Scholars believe and we concur that this work is important enough to be preserved reproduced and made generally available to the public. We appreciate your support of the preservation process and thank you for being an important part of keeping this knowledge alive and relevant.</p>