Susceptibility Modelling of Space-Time Modulated Metasurfaces
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Electromagnetic metasurfaces (MSs) present a challenge for modelling and numerical simulations, as they are inherently "multi-scale". Thus, equivalent models—namely zero-thickness sheets described by surface susceptibilities—are usually employed for numerical simulations. At the same time, space-time varying media have received interest in the past years due to the exciting phenomena they facilitate (e.g. non-reciprocity). This thesis primarily considers the intersection of these two research directions: the modelling of MSs with periodic variation in space and/or time, allowing a Floquet expansion to be used to calculate scattered fields in an efficient way. This thesis also presents susceptibility extractions for some canonical structures, including a ground plane with a dielectric cover layer. Finally, experimental results are shown for MSs which were fabricated, operating in the Ka-band, as a demonstration of the developed Floquet method. These were measured using a near-field (NF) system developed at Carleton University, as a contribution of this thesis.
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Copyright © 2021 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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- 2021
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tiukuvaara-susceptibilitymodellingofspacetimemodulated.pdf | 2023-05-05 | Public | Download |