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

G Gennarelli,G Riccio

doi:10.1017/s1759078720000616

Abstract

AbstractThe 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.

Highlights

Artificial engineered materials exhibiting extraordinary and unconventional electromagnetic properties at microwave and optical frequencies are more and more involved in research activities as well as in application scenarios
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
The Uniform Asymptotic Physical Optics (UAPO) solutions can be used in the framework of the Uniform Geometrical Theory of Diffraction (UTD) [20] and are expressed in a closed form containing only standard functions and parameters as the trigonometric functions, the UTD transition function, and the geometrical optics (GO) response of the structure in terms of reflection and transmission coefficients

Summary

Introduction

Artificial engineered materials exhibiting extraordinary and unconventional electromagnetic properties at microwave and optical frequencies are more and more involved in research activities as well as in application scenarios. 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. 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.

Results

Conclusion