{"id":{"repo_id":"umkc","oai_identifier":"oai:mospace.umsystem.edu:10355/74352"},"canonical_url":"https://search.dev.ndltd.org/etd/umkc/oai:mospace.umsystem.edu:10355/74352","repository":{"repo_id":"umkc","name":"University of Missouri - Kansas City","base_url":"https://mospace.umsystem.edu/oai/request"},"display":{"title":"Numerical Analysis of Helical and Log-periodic Antennas for Short Pulse Applications","abstract":"The planar log-periodic (LP) and helical antennas are numerically studied as two antennas with a wide range of applications. The advantages of the LP antenna are the large adjustable bandwidth as a frequency independence radiator, its low profile, and that it can be made to be elliptically polarized. The main advantages of a helical antenna are its excellent power handling capability and tunable gain. The helical antenna is widely used in many UWB applications such as Radar, satellite communication, GPS, and other short-pulse applications. High far-field gain is essential to many applications, but a tradeoff between gain, and time-domain dispersion exists if the input of the helical antenna is to consist of short-pulses. To quantify the level of dispersion, the antennas considered in this work are modeled as linear systems, and their time-domain impulse response is calculated using CST Microwave time-domain and FEKO frequency-domain simulations of the structure. A comprehensive parametric study of the helical antenna is conducted in FEKO followed by a multigoal optimized design of an L band helical antenna to minimize pulse dispersion, size, and input impedance while maximizing far-field gain and pulse shape preservation.","abstract_html":"The planar log-periodic (LP) and helical antennas are numerically studied as two antennas with a wide range of applications. The advantages of the LP antenna are the large adjustable bandwidth as a frequency independence radiator, its low profile, and that it can be made to be elliptically polarized. The main advantages of a helical antenna are its excellent power handling capability and tunable gain. The helical antenna is widely used in many UWB applications such as Radar, satellite communication, GPS, and other short-pulse applications. High far-field gain is essential to many applications, but a tradeoff between gain, and time-domain dispersion exists if the input of the helical antenna is to consist of short-pulses. To quantify the level of dispersion, the antennas considered in this work are modeled as linear systems, and their time-domain impulse response is calculated using CST Microwave time-domain and FEKO frequency-domain simulations of the structure. A comprehensive parametric study of the helical antenna is conducted in FEKO followed by a multigoal optimized design of an L band helical antenna to minimize pulse dispersion, size, and input impedance while maximizing far-field gain and pulse shape preservation.","abstract_has_math":false,"creators":["Al-Shaikhli, Waleed"],"institution":"University of Missouri--Kansas City","degree_name":"M.S. (Master of Science)","degree_level":"Masters","degree_discipline":"Electrical Engineering (UMKC)","degree_department":null,"school":null,"contributors":[],"advisors":["Hassan, Ahmed M."],"committee_chairs":[],"committee_members":[],"year":2020,"date_issued":"2020","date_published":"2020","updated_at":"2026-07-24T05:17:10Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/10355/74352","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Hassan, Ahmed M."]},{"key":"dc:creator","label":"Author","values":["Al-Shaikhli, Waleed"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2020-06-22T22:13:28Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2020-06-22T22:13:28Z"]},{"key":"dc:date.issued","label":"Date","values":["2020"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical Engineering (UMKC)"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S. (Master of Science)"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Missouri--Kansas City"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/10355/74352"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Title from PDF of title page viewed June 23, 2020","Thesis advisor: Ahmed M. Hassan","Thesis (M.S.)--School of Computing and Engineering. University of Missouri--Kansas City, 2020","Includes bibliographical references (pages 87-94)"]},{"key":"dc:description.abstract","label":"Abstract","values":["The planar log-periodic (LP) and helical antennas are numerically studied as two antennas with a wide range of applications. The advantages of the LP antenna are the large adjustable bandwidth as a frequency independence radiator, its low profile, and that it can be made to be elliptically polarized. The main advantages of a helical antenna are its excellent power handling capability and tunable gain. The helical antenna is widely used in many UWB applications such as Radar, satellite communication, GPS, and other short-pulse applications. High far-field gain is essential to many applications, but a tradeoff between gain, and time-domain dispersion exists if the input of the helical antenna is to consist of short-pulses. To quantify the level of dispersion, the antennas considered in this work are modeled as linear systems, and their time-domain impulse response is calculated using CST Microwave time-domain and FEKO frequency-domain simulations of the structure. A comprehensive parametric study of the helical antenna is conducted in FEKO followed by a multigoal optimized design of an L band helical antenna to minimize pulse dispersion, size, and input impedance while maximizing far-field gain and pulse shape preservation."]},{"key":"dc:title","label":"Title","values":["Numerical Analysis of Helical and Log-periodic Antennas for Short Pulse Applications"]}]}],"canonical_facts":{"dc:contributor.advisor":["Hassan, Ahmed M."],"dc:creator":["Al-Shaikhli, Waleed"],"dc:date.accessioned":["2020-06-22T22:13:28Z"],"dc:date.available":["2020-06-22T22:13:28Z"],"dc:date.issued":["2020"],"dc:description":["Title from PDF of title page viewed June 23, 2020","Thesis advisor: Ahmed M. Hassan","Thesis (M.S.)--School of Computing and Engineering. University of Missouri--Kansas City, 2020","Includes bibliographical references (pages 87-94)"],"dc:description.abstract":["The planar log-periodic (LP) and helical antennas are numerically studied as two antennas with a wide range of applications. The advantages of the LP antenna are the large adjustable bandwidth as a frequency independence radiator, its low profile, and that it can be made to be elliptically polarized. The main advantages of a helical antenna are its excellent power handling capability and tunable gain. The helical antenna is widely used in many UWB applications such as Radar, satellite communication, GPS, and other short-pulse applications. High far-field gain is essential to many applications, but a tradeoff between gain, and time-domain dispersion exists if the input of the helical antenna is to consist of short-pulses. To quantify the level of dispersion, the antennas considered in this work are modeled as linear systems, and their time-domain impulse response is calculated using CST Microwave time-domain and FEKO frequency-domain simulations of the structure. A comprehensive parametric study of the helical antenna is conducted in FEKO followed by a multigoal optimized design of an L band helical antenna to minimize pulse dispersion, size, and input impedance while maximizing far-field gain and pulse shape preservation."],"dc:identifier.uri":["https://hdl.handle.net/10355/74352"],"dc:title":["Numerical Analysis of Helical and Log-periodic Antennas for Short Pulse Applications"],"thesis:degree_discipline":["Electrical Engineering (UMKC)"],"thesis:degree_level":["Masters"],"thesis:degree_name":["M.S. (Master of Science)"],"thesis:institution_name":["University of Missouri--Kansas City"]},"updated_at":"2026-07-24T05:17:10Z"}