High-Frequency Evaluation of the Field Inside and Outside an Acute-Angled Dielectric Wedge

Gennarelli, Gianluca; Frongillo, Marcello; Riccio, Giovanni

doi:10.1109/tap.2014.2364305

Cited by 30 publications

(18 citation statements)

References 22 publications

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“…The angle ϕ 0 fixes the incidence direction in a polar coordinate system perpendicular to the edge (see Fig. 1), and its values are assumed to range from π∕2 to π − α as in [11], so that only S 0 is illuminated by the incident plane wave. Diffraction problems involving other ϕ 0 values can be tackled and solved in a similar way.…”

Section: Diffraction Problemmentioning

confidence: 99%

“…According to [11], the FD-UAPO diffracted field E d to be added to the FD-GO field at P can be expressed as…”

Section: Diffraction Problemmentioning

confidence: 99%

“…The analytical expressions of D 0 and D n elements have been derived in [11] by considering two separate scattering problems relevant to the wedge region and the surrounding space, and by formulating the corresponding radiation integrals in terms of electric and magnetic equivalent PO surface currents lying on the internal and external faces of the wedge. For each observation domain, analytical manipulations and calculations completed by uniform asymptotic evaluations of the resulting integrals have been performed for obtaining closed form expressions.…”

Section: Diffraction Problemmentioning

confidence: 99%

“…For each observation domain, analytical manipulations and calculations completed by uniform asymptotic evaluations of the resulting integrals have been performed for obtaining closed form expressions. Note that the FD-UAPO diffraction coefficients in [11] do not take into account surface waves. The TD counterpart of E d can be calculated by means of the convolution integral…”

Section: Diffraction Problemmentioning

confidence: 99%

“…As previously stated, the key point is the analytical evaluation of the TD-UAPO diffraction coefficients related to the dielectric region and the surrounding space. According to [4], they are determined via an inverse Laplace transform of the FD counterparts reported in [11], where easy-to-handle expressions have been obtained in terms of the Fresnel reflection and/or transmission coefficients of the structure and the UTD transition function [3].…”

Section: Introductionmentioning

confidence: 99%

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TD-UAPO diffracted field evaluation for penetrable wedges with acute apex angle

2015

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This study deals with the time domain (TD) diffraction phenomenon related to a penetrable acute-angled dielectric wedge. The transient diffracted field originated by an arbitrary function plane wave is evaluated via a convolution integral involving the TD diffraction coefficients, which are determined here in closed form, starting from the knowledge of the frequency domain counterparts. In particular, the inverse Laplace transform is applied to the uniform Asymptotic physical optics diffraction coefficients valid for the internal region of the wedge and the surrounding space. Diffraction by penetrable wedges in the TD framework is a challenging problem from the analytical point of view, and no other expressions are available in closed form for the diffraction coefficients associated with the considered problem.

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Section: Diffraction Problemmentioning

confidence: 99%

“…According to [11], the FD-UAPO diffracted field E d to be added to the FD-GO field at P can be expressed as…”

Section: Diffraction Problemmentioning

confidence: 99%

Section: Diffraction Problemmentioning

confidence: 99%

Section: Diffraction Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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TD-UAPO diffracted field evaluation for penetrable wedges with acute apex angle

2015

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High-frequency diffraction contribution by planar metallic–DNG metamaterial junctions

Gennarelli

Riccio

2020

Int. J. Microw. Wireless Technol.

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The plane wave diffraction by a planar junction consisting of a thick metallic sheet and a lossy double-negative metamaterial slab is studied by using the Uniform Asymptotic Physical Optics approach. This approach assumes the radiation integral as a starting point and uses the physical optics surface currents as sources to be integrated. The integral is manipulated by taking advantage of useful approximations and evaluations, and re-formulated in order to apply an asymptotic procedure able to generate a closed-form approximate solution in the framework of the Uniform Geometrical Theory of Diffraction. Accordingly, advantages and drawbacks result from the application of the proposed solution. The jumps of the geometrical optics field are compensated. Implementation and handling of the computer code are facilitated by the evaluation of well-known functions and parameters. No differential/integral equations or special functions must be computed.

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A high-performance microwave plasma source employing dielectric wedges

Yang,

Zhang,

Huang

et al. 2024

J. Phys. D: Appl. Phys.

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The microwave-to-plasma energy conversion efficiency and the ease of plasma self-ignition are critical factors affecting the applications for microwave plasma sources (MPS). This study presents a novel MPS utilizing dielectric wedges for self-ignition and improved energy conversion. Firstly, we crafted a dielectric wedge with a gradient refractive index, guiding the electric field from air to dielectric materials and facilitating microwave propagation along the dielectric in a waveguide. Through electromagnetic simulation, we explored how the size and permittivity of the dielectric wedge affect the electric field distribution. Then, the MPS based on the dielectric wedge was designed. In this configuration, a dielectric tube encloses the discharge tube, connecting to dielectric wedges to guide electromagnetic waves to the plasma. We analyzed the MPS performance using the Drude model, evaluating microwave energy conversion efficiency across various electron densities and collision frequencies. The results were compared with a commonly used MPS based on a tapered waveguide, demonstrating the proposed MPS has wider applicability across different operation conditions. Finally, experiments under low pressures were conducted using various gases, showing an average energy conversion efficiency of approximately 40% higher than the tapered waveguide MPS. The experiments also indicate the proposed MPS has a greater capability of self-ignition at lower power levels. These findings highlight the efficacy of incorporating dielectric wedges to enhance MPS performance, making it conducive for broader industrial applications.

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High-Frequency Evaluation of the Field Inside and Outside an Acute-Angled Dielectric Wedge

Cited by 30 publications

References 22 publications

TD-UAPO diffracted field evaluation for penetrable wedges with acute apex angle

TD-UAPO diffracted field evaluation for penetrable wedges with acute apex angle

High-frequency diffraction contribution by planar metallic–DNG metamaterial junctions

A high-performance microwave plasma source employing dielectric wedges

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