Electromagnetic Wave Propagation through Circular Waveguides Containing Radially Inhomogeneous Lossy Media
Abstract
Propagation characteristics of an electromagnetic (EM) wave inside a waveguide are greatly modified by the introduction of dielectrics into the guide. Frequency of cutoff, attenuation, and power flow distribution are all properties of the EM wave that are highly dependent on the physical structural and composition within the guide. Shielding applications take advantage of the large amount of attenuation provided by a waveguide when the incident EM wave has a frequency lower than the cutoff frequency of the waveguide. In practice, small sections of waveguides are inserted through the metal walls of a shielded enclosure to construct an air passage that does not compromise the shielding effectiveness of the shelter. Typically, however, other fluids and materials besides air must be transferred inside the enclosure. Therefore, hoses are sometimes inserted through these waveguides, which can reduce the shielding provided by the waveguide above and below cutoff.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1989
- Accession Number
- ADA213062
Entities
People
- Keith W. Whites
Organizations
- Construction Engineering Research Laboratory