Diffraction of an electromagnetic plane wave by a thick slit
Abstract
Diffraction of an electromagnetic plane wave by an infinite slit in a conducting screen of finite thickness is studied theoretically using WeberSchafheitlin discontinuous integrals. The direction of the incident wave is assumed to be in a plane perpendicular to that of the screen, and both polarizations are treated. The problems are reduced to simultaneous equations with an infinite number of unknowns, which are truncated in actual numerical computation. Numerical results for transmission coefficients are compared with those calculated from the Mathieu function expansion, and fairly good agreement is obtained. Farfield patterns are measured experimentally for the EPolarization using a parallelplate waveguide. The measured results confirm the validity of the theoretical prediction.
 Publication:

IEEE Transactions on Antennas and Propagation
 Pub Date:
 May 1978
 DOI:
 10.1109/TAP.1978.1141870
 Bibcode:
 1978ITAP...26..494H
 Keywords:

 Electromagnetic Wave Filters;
 Electromagnetic Wave Transmission;
 Plane Waves;
 Wave Diffraction;
 Waveguide Antennas;
 Antenna Radiation Patterns;
 Far Fields;
 Mathieu Function;
 Polarization (Waves);
 Screens;
 Simultaneous Equations;
 Slot Antennas;
 Sound Waves;
 Transmissivity;
 Communications and Radar