A Moment Solution for Electromagnetic Coupling through a Small Aperture.
Abstract
A three-term moment solution for electromagnetic coupling through a small aperture in a conducting screen is obtained. This solution gives the equivalent magnetic current in the aperture as a linear combination of the three quasi-static magnetic currents responsible for the three dipole fields seen in the far zone. Because only the dipole effects of the quasi-static currents are known, the elements of the excitation vector and the moment matrix can not be evaluated directly. Reciprocity is used to express the elements of the excitation vector in terms of the short-circuit incident fields. The imaginary parts of the elements of the moment matrix are evaluated by forcing the moment solution to be equal to the solution predicted by conventional small aperture theory. The real parts of the elements of the moment matrix are extracted from the quadratic expression for the power radiated by the magnetic current. The solution is applied to three examples - an aperture in a conducting plane, and aperture in a transverse wall between two rectangular waveguides, and an aperture in a lateral wall of a rectangular waveguide coupling to a half-space. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1981
- Accession Number
- ADA109721
Entities
People
- Joseph R. Mautz
- Roger F. Harrington
Organizations
- Syracuse University