Chu, Zhiyuan; (2023) Design and Understanding of Reconfigurable Surface Wave Communication Technology. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

This thesis endeavors to develop innovative reconfigurable surface wave transmission technology and investigate its propagation characteristics. Surface waves exhibit potential advantages over traditional space waves, including low path attenuation and resistance to interference. This introduces a promising avenue for highly intelligent wireless communication systems to tackle the intricate challenges posed by complex channel environments and extensive device connectivity. The study introduces a variety of novel porous reconfigurable surface wave platforms applicable to diverse scenarios, ranging from outdoor to indoor and on-chip communications. This platform can dynamically establish diverse fluid-metal-based pathways on the surface, effectively guiding and localizing the propagation of surface waves. These pathways encompass linear, curved, and distributed trajectories. Theoretically, this study establishes a relatively comprehensive mathematical analysis model to forecast the electromagnetic field intensity and losses of surface waves within propagation pathways. This facilitates a systematic understanding of how variables like surface material, thickness, cavity porosity, and more impact propagation performance, thus enabling the effective optimization of reconfigurable surface structures. In practice, the study evaluates numerous outcomes through 3D-printed platforms and thorough electromagnetic simulations. An intricate exploration encompasses parameters such as metal layer count, pathway width, configurations of turns and intersections, symmetry, and asymmetry. These investigations further contribute to the optimization of dynamic pathway structures. Moreover, simulation outcomes are corroborated through corresponding experiments, confirming the accuracy of the mathematical analysis presented within this thesis. The research findings unequivocally underscore the feasibility of the proposed reconfigurable platform concerning broadband capacity, minimal path loss, and dynamic reconfigurability in communication. The platform adeptly materializes adaptable functionalities, encompassing surface wave path configuration, power distribution, and frequency selection, thereby fostering heightened flexibility and adaptability within surface wave communication networks. Furthermore, it accentuates the prospective application of surface wave technology within future communication systems.

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