Mutual coupling between parallel columns of periodic slots in a ground plane surrounded by dielectric slabs
Abstract
Arrays of slots with arbitrary orientation in a conducting plane which are infinitely periodic in one dimension and finitely periodic in another dimension are considered. The perfect conducting plane extends infinitely and is bounded on each side by dielectric slabs of finite thickness and infinite extent. Single columns of slots are represented by equivalent magnetic scattering currents, which are solved for via the moment method. The mutual coupling (admittance) between slot columns in the presence of the stratified media is found by the array scanning method (ASM), which expresses the admittance as the average of the scan admittance of an artificially constructed doubly infinite array of slots over all real scan angles. The technique avoids the use of Sommerfeld integrals, but still gives rise to singularities at scan angles corresponding to the resonant excitation of surface waves. An analytical approximation is made to remove these surface wave singularities, thus making numerical implementation of the method practical. The method is quite general and may be extended to thin slot elements of arbitrary shape and orientation.
- Publication:
-
IEEE Transactions on Antennas and Propagation
- Pub Date:
- November 1992
- DOI:
- 10.1109/8.202710
- Bibcode:
- 1992ITAP...40.1324S
- Keywords:
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- Antenna Arrays;
- Antenna Radiation Patterns;
- Electromagnetic Scattering;
- Slot Antennas;
- Dielectrics;
- Electric Conductors;
- Fast Fourier Transformations;
- Green'S Functions;
- Method Of Moments;
- Communications and Radar