2026-09-22T01:26:15Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/129615 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 'U of I Access', the embargo will last until 2027-05-01 The student, Shuo Liu, accepted the attached license on 2025-04-30 at 14:53. The student, Shuo Liu, submitted this Dissertation for approval on 2025-04-30 at 15:05. This Dissertation was approved for publication on 2025-05-01 at 12:38. DSpace SAF Submission Ingestion Package generated from Vireo submission #22124 on 2025-10-19 at 19:16:52 An electronic beam-steering antenna using a tunable FSS Liu, Shuo 2025-05-01 Bernhard, Jennifer T Bernhard, Jennifer T Schutt-Aine, Jose Dragic, Peter Zhao, Yang Antenna FSS Beam-steering eng Two novel FSS (frequency selective surface) systems working from 1.6 to 1.8 GHz are proposed for cellular beam-steering applications. An FSS system is comprised of metallic screens which are sandwiched by dielectric slabs. In order for the system to function as a band-pass filter, the geometry of the unit cell on the metallic screens is designed to be a slotted patch. The FSS system is capable of providing reconfigurable phase shifts for transmitted waves with the use of electronic devices in the unit cells. Therefore, it can achieve beam-steering ability if the phase differences of the transmitted waves coming out of the adjacent columns on the FSS are properly configured. A horn antenna is used as the feed to form a filtenna with the FSS system to provide high gain. Another FSS system made of dipole-patch array is also proposed. This FSS system consists of a basic set of four dipole patches and a tail patch. By adjusting the tail dimension, the FSS system allows for beam-steering ability. Compared with the slotted-patch FSS, the dipole-patch FSS has the advantages of low power consumption and low cost. The experimental and simulated results of both FSS systems are be presented. 2025-05 Thesis https://hdl.handle.net/2142/129615 Copyright 2025 Shuo Liu Electrical & Computer Eng Electrical & Computer Engr University of Illinois Urbana-Champaign Ph.D. Dissertation