{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/105085"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/105085","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Analysis of a finite array threshold through surface waves","abstract":"Embargo set by: Seth Robbins for item 112204 Lift date: 2021-08-23T20:36:18Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","abstract_html":"Embargo set by: Seth Robbins for item 112204 Lift date: 2021-08-23T20:36:18Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","abstract_has_math":false,"creators":["Grady, Ian Daniel Walsdorf"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":["Bernhard, Jennifer T."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-08-23T20:36:09Z","date_published":"2019-08-23T20:36:09Z","updated_at":"2026-07-22T22:24:44Z","subjects":["finite array","finite array threshold","surface waves","active input impedance","edge effects","dummy elements"],"languages":["en"],"rights":["Copyright 2019 Ian Daniel Walsdorf Grady"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/105085","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Bernhard, Jennifer T."]},{"key":"dc:creator","label":"Author","values":["Grady, Ian Daniel Walsdorf"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-08-23T20:36:09Z","2021-08-24T09:15:34Z","2019-04-24","2019-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical & Computer Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["finite array","finite array threshold","surface waves","active input impedance","edge effects","dummy elements"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2019 Ian Daniel Walsdorf Grady"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/105085"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Embargo set by: Seth Robbins for item 112204 Lift date: 2021-08-23T20:36:18Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 112204 on 2021-08-24T09:15:34Z.","\"Antenna arrays are an active area of electromagnetics research, due to their applications in sensing and communication. As the size of electronic devices is decreased, the total space in which an antenna array can be implemented also decreases. As antenna arrays get smaller, infinite array approximations that can be used when an array is large can no longer be used due to inaccuracies, termed \"\"edge effects,\"\" caused by the edge of the array. Accordingly a so-called finite array threshold, at which point edge effects can no longer be neglected, is proposed in this thesis for an array of planar half-wave dipoles. Initial studies examine the input impedance of the antenna elements across frequency. The radiation pattern of a calculated array is compared with the simulated pattern to gain insights into inter-element coupling, and an examination of the effect of array dummy elements is also carried out. Surface waves present in the array and measured with active input impedance are proposed as a unique way to realize the finite array threshold. Finally, an antenna is constructed to show the measurable effects of the surface wave in the radiation pattern of the antenna array.\"","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2021-05-01","The student, Ian Grady, accepted the attached license on 2019-04-24 at 12:36.","The student, Ian Grady, submitted this Thesis for approval on 2019-04-24 at 12:47.","This Thesis was approved for publication on 2019-04-24 at 14:56.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13879 on 2019-08-22 at 15:08:15","Made available in DSpace on 2019-08-23T20:36:09Z (GMT). No. of bitstreams: 3 GRADY-THESIS-2019.pdf: 16778231 bytes, checksum: ef63b1043385c0c69ad34a4e6eecee99 (MD5) IEEE Permissions.PNG: 107878 bytes, checksum: d396eca37b565b959059335393cda43f (MD5) LICENSE.txt: 4206 bytes, checksum: 9e097d885bb855e7f23b9520a7c01c07 (MD5) Previous issue date: 2019-04-24"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Analysis of a finite array threshold through surface waves"]}]}],"canonical_facts":{"dc:contributor":["Bernhard, Jennifer T."],"dc:creator":["Grady, Ian Daniel Walsdorf"],"dc:date":["2019-08-23T20:36:09Z","2021-08-24T09:15:34Z","2019-04-24","2019-05"],"dc:description":["Embargo set by: Seth Robbins for item 112204 Lift date: 2021-08-23T20:36:18Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 112204 on 2021-08-24T09:15:34Z.","\"Antenna arrays are an active area of electromagnetics research, due to their applications in sensing and communication. As the size of electronic devices is decreased, the total space in which an antenna array can be implemented also decreases. As antenna arrays get smaller, infinite array approximations that can be used when an array is large can no longer be used due to inaccuracies, termed \"\"edge effects,\"\" caused by the edge of the array. Accordingly a so-called finite array threshold, at which point edge effects can no longer be neglected, is proposed in this thesis for an array of planar half-wave dipoles. Initial studies examine the input impedance of the antenna elements across frequency. The radiation pattern of a calculated array is compared with the simulated pattern to gain insights into inter-element coupling, and an examination of the effect of array dummy elements is also carried out. Surface waves present in the array and measured with active input impedance are proposed as a unique way to realize the finite array threshold. Finally, an antenna is constructed to show the measurable effects of the surface wave in the radiation pattern of the antenna array.\"","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2021-05-01","The student, Ian Grady, accepted the attached license on 2019-04-24 at 12:36.","The student, Ian Grady, submitted this Thesis for approval on 2019-04-24 at 12:47.","This Thesis was approved for publication on 2019-04-24 at 14:56.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13879 on 2019-08-22 at 15:08:15","Made available in DSpace on 2019-08-23T20:36:09Z (GMT). No. of bitstreams: 3 GRADY-THESIS-2019.pdf: 16778231 bytes, checksum: ef63b1043385c0c69ad34a4e6eecee99 (MD5) IEEE Permissions.PNG: 107878 bytes, checksum: d396eca37b565b959059335393cda43f (MD5) LICENSE.txt: 4206 bytes, checksum: 9e097d885bb855e7f23b9520a7c01c07 (MD5) Previous issue date: 2019-04-24"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/105085"],"dc:language":["en"],"dc:rights":["Copyright 2019 Ian Daniel Walsdorf Grady"],"dc:subject":["finite array","finite array threshold","surface waves","active input impedance","edge effects","dummy elements"],"dc:title":["Analysis of a finite array threshold through surface waves"],"dc:type":["text"],"thesis:degree_discipline":["Electrical & Computer Engr"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:44Z"}