A Planar and Subwavelength Open Guided Wave Structure Based on Spoof Surface Plasmons
Date Issued
2015
Date
2015
Author(s)
Yang, Liang-Yu Ou
Abstract
A planar and compact open waveguiding structure based on spoof surface plasmon polaritons (SPPs) was demonstrated. For practicality, instead of the well-known wire medium, the uniaxial strip medium (USM) was proposed and used as the effective bulk material with a negative dielectric constant to support the spoof SPP modes. The relevant formulations, including the modal dispersion relations and the formulation for the waves in a multilayer anisotropic spatially dispersive structure, are analytically presented in this thesis. Interestingly, instead of taming and suppressing the spatial dispersion (SD), which had been done in most past studies, SD was exploited in the proposed structure to enhance the field confinement of the spoof SPP mode by approximately 41%. Moreover, the thickness of the USM slab could be reduced by 50% using conductor backing and without perturbing the odd mode. This method and SD can help avoid electromagnetic interactions among various components of a multilayer printed circuit board (PCB) structure and help miniaturize sensors or surface-wave waveguides in the microwave regime. Two experiments were conducted to verify the theoretical calculations and simulations. The first experiment is designed to demonstrate the presence of the spoof SPP modes and the thickness of the proposed structure is in subwavelength order. Additionally, the propagation loss for such slow-wave structures has seldom been discussed analytically and quantitatively. In this thesis, through calculations and simulations, low attenuation constants in the spoof SPP propagation direction of the proposed structures were investigated. In the second experiment, the existence of the predicted spoof SPP is again confirmed and the practical transmission performance is demonstrated. The results show that the spoof SPP can enhance the transmission efficiency between a transmitter and receiver system.
Subjects
guided wave structures
spatial dispersion
spoof surface plasmon
uniaxial strip medium
Type
thesis
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