Theory of Electromagnetic Shielding for Conducting Cylinders and Spheres
Abstract
The shielding of electromagnetic waves by cylindrical and spherical enclosures is analyzed. The electromagnetic shielding effectiveness is calculated as a function of frequency for a plane wave incident on hollow cylindrical and spherical conducting shells. The electromagnetic resonances for the cylinder and the sphere are investigated and the resonance conditions are derived for both structures. In addition, a simple asymptotic formula for the shielding effectiveness is developed which is a good approximation in the resonance regime. Numerical calculations are performed for both the cylinder and the sphere, and the shielding effectiveness is plotted as a function of frequency for a shield with an outer diameter of 155 mm, a thickness of 0.1mm, and a conductivity of 10 to the 7th per ohm per meter.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1991
- Accession Number
- ADA233261
Entities
People
- John Podesta
Organizations
- United States Army Armament Research, Development and Engineering Center