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oai:www.ideals.illinois.edu:2142/98258 2023-07-11 col_2142_8888 col_2142_5131 com_2142_8887 com_2142_234 com_2142_5130

Chew, Weng C. Chew, Weng C. Carney, Paul S. Kudeki, Erhan Makela, Jonathan Rutherford, Joseph M 2017-09-29T16:39:21Z 2017-09-29T16:39:21Z 2019-09-30T09:15:32Z 2017-07-10 2017-08 The effect of installation for an antenna is key to understanding its performance in the intended operating environments. While existing formulations support such analysis, their mapping of calculations to distributed computing hardware does not support simulating installation environments of arbitrary size. This work builds upon existing techniques to simulate installed antenna behavior using scattering analyses tailored to system components. The scattering operations reveal opportunities to introduce approximate techniques which form generalized hybrid solvers. The source antenna (with both subwavelength-scale and wavelength-scale features) is modeled with the electric field integral equation (EFIE), and it interfaces with the installation site using the equivalence principle algorithm (EPA) as a domain decomposition method (DDM). The use of EPA to enclose the EFIE-modeled antenna generalizes the method to arbitrary antenna models. The electrically large exterior structures are modeled with physical optics (PO) without loss of generality to other approximate or high-frequency asymptotic methods through a Schur complement analysis of the continuous and discretized equations. The proposed Schur complement EPA-PO hybrid introduces clear physics with applicability to other formulations for the individual domains. The proposed hybrid also maps the PO calculations efficiently to distributed parallel computing resources; the parallel computations are demonstrated by executing the simulations on a hybrid parallel distributed- and shared-memory computing cluster. The calculation of antenna interactions with electrically large structures implies transition from wave-physics to ray-physics behaviors, which raises questions of reduced rank in the discretized operators. These questions are addressed by identifying the wave- to ray-physics transition and observing reduced rank in the space of plane wave functions. Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-08-01 The student, Joseph Rutherford, accepted the attached license on 2017-07-07 at 13:43. The student, Joseph Rutherford, submitted this Dissertation for approval on 2017-07-07 at 13:52. This Dissertation was approved for publication on 2017-07-10 at 11:38. DSpace SAF Submission Ingestion Package generated from Vireo submission #11337 on 2017-09-29 at 11:14:51 Made available in DSpace on 2017-09-29T16:39:21Z (GMT). No. of bitstreams: 3 RUTHERFORD-DISSERTATION-2017.pdf: 1816497 bytes, checksum: 65c59fb583bbef0cc64e16d6379e7b43 (MD5) LICENSE.txt: 4214 bytes, checksum: c301a5e91ecc7c6e3c6d62385091a251 (MD5) PROQUEST_LICENSE.txt: 4560 bytes, checksum: 5c8b58012aad5d4579f017f1dc610b58 (MD5) Previous issue date: 2017-07-10 Embargo set by: Colleen Fallaw for item 103405 Lift date: 2019-09-29T16:39:52Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Embargo set by: Colleen Fallaw for item 103405 Lift date: 2019-09-29T17:52:45Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Limited Restriction Lifted for Item 103405 on 2019-09-30T09:15:32Z. application/pdf http://hdl.handle.net/2142/98258 en Copyright 2017 Joseph M. Rutherford Surface integral equation Domain decomposition method Equivalence principle algorithm Physical optics Computation of multiscale time-harmonic electromagnetic radiation text text Electrical & Computer Eng Electrical & Computer Engr University of Illinois at Urbana-Champaign Dissertation Ph.D.