scholarly journals Dielectric-induced surface wave radiation loss

2020 ◽  
Vol 476 (2236) ◽  
pp. 20190859
Author(s):  
Tobias Schaich ◽  
Anas Al Rawi ◽  
Trevor Morsman ◽  
Mike Payne
Keyword(s):  
Experimental Data ◽  
Surface Wave ◽  
Wave Mode ◽  
Wave Radiation ◽  
Mode Matching ◽  
Full Wave ◽  
Matching Technique ◽  
Surface Waveguide ◽  
Conducting Sheet

We investigate a model which shows how the introduction of a perturbing dielectric close to an electromagnetic surface wave leads to radiation away from the surface through the dielectric. This resembles a surface waveguide passing through a wall or being deployed underground. Our theory, which is based on the mode-matching technique, allows quantitative determination of losses from a bound surface wave mode up to the point of its complete extinction. For a surface wave supported by a coated, conducting sheet the attenuation due to the perturbing dielectric is calculated for a number of frequencies, permittivities of the perturbation and separations between the sheet and the perturbing dielectric. The accuracy of our results is verified by simulation of the system with a full-wave numerical solution. Finally, we report experimental data of perturbed surface waves on a cable, which are in qualitative agreement with our model.

Experimental determination of surface wave mode contributions

1990 ◽  
Author(s):  
Glenn J. Rix ◽  
Kenneth H. Stokoe ◽  
Jose M. Roesset
Keyword(s):  
Surface Wave ◽  
Experimental Determination ◽  
Wave Mode

scholarly journals Generalized Boundary Conditions in Surface Electromagnetics: Fundamental Theorems and Surface Characterizations

2019 ◽  
Vol 9 (9) ◽  
pp. 1891 ◽  
Author(s):  
Xiao Liu ◽  
Fan Yang ◽  
Maokun Li ◽  
Shenheng Xu
Keyword(s):  
Surface Wave ◽  
Boundary Conditions ◽  
Wave Mode ◽  
Surface Scattering ◽  
Impedance Boundary ◽  
Scattering Coefficients ◽  
Full Wave ◽  
Generalized Boundary Conditions ◽  
Characterization Procedure ◽  
Fundamental Theorems

Generalized boundary conditions (GBCs) for electromagnetic surfaces are investigated in this paper, which can be used to analytically characterize field discontinuities across two-dimensional surfaces. First, five representative features are described to categorize various surface problems which require proper GBC-based characterization procedures. Next, the generalized boundary conditions are discussed in details, in association with impedance boundary conditions, generalized sheet transition conditions, and surface scattering coefficients. Then an extraction method for surface susceptibilities, the characteristic parameters of surfaces in GBCs, are proposed and validated. Finally, to illustrate the applications of GBCs, two representative surface problems are demonstrated, namely, isolated-aperture surface analysis and surface-wave mode characterization. For the isolated-aperture surface, a characterization procedure is derived based on GBCs and Babinet’s principle, and the accuracy is validated through comparison with full-wave simulations. For surface wave analysis, a characterization procedure is also developed from GBCs, and the feasibility is verified by numerical examples as well.

Mode matching technique-based modeling of coaxial and circular waveguide discontinuities for material characterization purposes

2011 ◽  
Vol 3 (6) ◽  
pp. 679-690 ◽  
Author(s):  
Emmanuel Decrossas ◽  
Mahmoud A. EL Sabbagh ◽  
Victor Fouad Hanna ◽  
Samir M. El-Ghazaly
Keyword(s):  
Complex Permittivity ◽  
Dielectric Material ◽  
Circular Waveguide ◽  
Mesh Size ◽  
Mode Matching ◽  
Full Wave ◽  
Matching Technique ◽  
Operational Frequency ◽  
Computational Resources ◽  
Mode Matching Technique

In this paper, it is proposed to use a cylindrical cell for the characterization of dielectric material. The extraction of complex permittivity is based on inverse gradient approach where the full-wave simulation results are mapped to experimental data to extract the complex permittivity. As the operational frequency of radio frequency (RF)/microwave devices is increased, it becomes difficult to accurately model waveguide transitions using traditional methods based on meshing such as finite-element method (FEM) where mesh size is determined according to the wavelength. Moreover, these techniques usually require extensive computational resources. Mode matching technique (MMT) is the full-wave tool implemented in this current work. It is used to compute the generalized scattering matrices (GSMs) of the different discontinuities of test setup. These GSMs model precisely discontinuities as they include the effects of all higher-order modes propagating and evanescent. Simulation and experimental results are included to validate the proposed approach for the rigorous modeling of those discontinuities and hence the extraction of complex permittivity.

Full-wave modeling of via hole grounds in microstrip by three-dimensional mode matching technique

1992 ◽  
Vol 40 (12) ◽  
pp. 2228-2234 ◽  
Author(s):  
R. Sorrentino ◽  
F. Alessandri ◽  
M. Mongiardo ◽  
G. Avitabile ◽  
L. Roselli
Keyword(s):  
Three Dimensional ◽  
Mode Matching ◽  
Wave Modeling ◽  
Full Wave ◽  
Matching Technique ◽  
Via Hole ◽  
Mode Matching Technique
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