2026-09-21T04:15:16Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/129665 2026-02-05 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

application/pdf en text Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-05-01 The student, David Mitchell, accepted the attached license on 2025-02-28 at 11:09. The student, David Mitchell, submitted this Dissertation for approval on 2025-02-28 at 11:17. This Dissertation was approved for publication on 2025-03-04 at 15:44. DSpace SAF Submission Ingestion Package generated from Vireo submission #21653 on 2025-10-19 at 19:52:23 Investigation of electrically small antennas designed for directive radiation from transient signaling Mitchell, David S 2025-03-04 Bernhard, Jennifer T Bernhard, Jennifer T Schutt-Aine, Jose E Makela, Jonathan J Kolb, Paul Antennas electrically small antennas directivity transient antennas eng Electrically small antennas are a useful subset of antennas because of their small physical size; however, they are inherently limited in their performance because of the relation between electrical size and bandwidth. Many authors have recently sought to improve the performance of electrically small antennas by introducing nonlinear or time-varying components, using transient signaling, or increasing the directivity of the antenna. This work explores an antenna system that leverages the inherent narrowband nature of an electrically small antenna to achieve directive radiation from the transient ringing of the antenna system. This novel antenna is first explored through simulation. Next, a circuit model for predicting the operating frequency of this antenna is developed. Several versions of this antenna are then manufactured and characterized. Finally, a method for characterizing the transient behavior of an antenna is described and used to demonstrate the directive transient radiation of this antenna. This dissertation demonstrates the design of an antenna shown to have directive radiation with both continuous and transient excitations and methods for characterizing that radiation. 2025-05 Thesis https://hdl.handle.net/2142/129665 Copyright 2025 David Mitchell Electrical & Computer Eng Electrical & Computer Engr University of Illinois Urbana-Champaign Ph.D. Dissertation