UWB single arm spiral antenna on an EBG substrate

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Title: UWB single arm spiral antenna on an EBG substrate
Author: Alhorr, Faris Sadek
Abstract: Electromagnetic band -gap (EBG ) structures exhibit unique electromagnetic properties that have led to a wide range of applications in electromagnetic devices . In this study , electromagnetic bandgap structures are utilized to enhance the bandwidth of a low -profile one -arm Archimedean spiral antenna built on a thin substrate and backed by a ground plane . It is well known that placing a ground plane (a perfect electric conductor ) closely behind a spiral antenna to make the radiation unidirectional severely limits the antenna bandwidth . In order to mitigate the ground plane effect , thus , significantly increasing the bandwidth , electromagnetic bandgap structures are employed . Specifically , the one -arm spiral is placed over an EBG surface which in turn is backed by a ground plane . The EBG surface investigated for this antenna utilizes a periodic structure of rectangular patches . The EBG surface behaves as artificial magnetic conductor in the frequency band of operation . The novel antenna configuration is investigated theoretically using Ansoft Designer which uses a full -wave method of moments solver . Parametric study to understand the effect of geometrical and substrate parameters on antenna performance is carried out . It is shown that the novel antenna design with the EBG surface significantly improves the antenna bandwidth . The design details along with simulation and experimental results will be presented .
URI: http : / /hdl .handle .net /2346 /10028
Date: 2007-12


UWB single arm spiral antenna on an EBG substrate. Master's thesis, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /10028 .

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