DIFFRACTION OF ELECTROMAGNETIC WAVES BY A PARALLEL PLATE WAVEGUIDE WITH IMPEDANCE BOUNDARIES

Ghulam Yameen Mallah; Munwar Ayaz Memon; Muzaffar Bashir Arain; Mehboob Ali Jatoi; Darshan Solanki

doi:10.71146/kjmr870

Authors

Ghulam Yameen Mallah Department of Basic Science and Related Studies, Quaid-e-Awam University of Engineering, Science and Technology, 67480 Nawabshah, Sindh, Pakistan. Author
Munwar Ayaz Memon Department of Electrical Engineering, Quaid-e-Awam University of Engineering, Science and Technology, 67480 Nawabshah, Sindh, Pakistan. Author
Muzaffar Bashir Arain Department of Mathematics and Statistics,Quaid-e-Awam University of Engineering, Science and Technology, 67480 Nawabshah, Sindh, Pakistan. Author
Mehboob Ali Jatoi Department of Basic Science and Related Studies, Quaid-e-Awam University of Engineering, Science and Technology, 67480 Nawabshah, Sindh, Pakistan. Author
Darshan Solanki Department of Basic Science and Related Studies, Quaid-e-Awam University of Engineering, Science and Technology, 67480 Nawabshah, Sindh, Pakistan. Author

DOI:

https://doi.org/10.71146/kjmr870

Keywords:

Diffraction, parallel plate waveguide, mode matching, impedance boundary conditions, electromagnetic scattering

Abstract

This paper presents an analysis of plane wave diffraction by a parallel-plate waveguide structure with mixed boundary conditions. The configuration consists of a perfectly conducting half-plane located at for , and an impedance plane at with piecewise constant surface impedances for and for . An E-polarized plane wave is considered as the incident field. A mode matching formulation is developed to model the electromagnetic field distribution within the structure. The fields in each region are expanded in terms of waveguide eigen modes, and the continuity conditions at the junction are enforced to obtain an infinite system of linear algebraic equations. This system is solved numerically using a suitable truncation scheme. The far-field diffracted field is evaluated using the stationary phase method. Numerical results are presented to investigate the influence of waveguide spacing, surface impedance variation, and angle of incidence on the diffraction characteristics. The proposed approach provides an accurate and computationally efficient framework for analysing diffraction in such waveguide configurations.

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