Broadband Application of High Impedance Ground Planes

<p>Electrical conductors have long been the only materials available to antenna designers for reflecting structures. However recently reported high impedance ground plane (HIGP) structures offer a possible alternative. Within a limited frequency stopband the high impedance structures create image currents and reflections that are inphase with a source rather than out-of-phase as for a PEC surface. Also the high impedance structures suppress surface waves while surface waves propagate on PEC surfaces. This research explores broadband antenna applications for HIGP structures. A broadband surface mount antenna is applied to both a homogeneous narrowband HIGP and a spatially varying broadband HIGP design. Measurements reveal the ground plane alters the fundamental radiating modes of the antenna and show high frequency regions of the ground plane short out low frequency energy in the antenna. Novel integrated antenna/ground-plane structures are also introduced and analyzed. Basic high impedance elements are linked to form larger broadband antenna elements within the ground plane itself. The antenna/ground-plane structure becomes a broadband receive antenna that can be fully integrated into a PEC ground plane surface.</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>