Electromagnetic Field Probes.
Abstract
This report summarizes investigations of a program directed to the development of techniques and probes for measurement of electromagnetic radiation in shielded enclosures over the 20 to 200 MHz frequency range. During this period, emphasis was placed on (1) determining the effects of the surface texture, conductivity, and thickness of lossy-wall materials on coupling characteristics in shielded enclosures, (2) measurement of interaction effects between electrically-small equipment cases and shielded enclosures, (3) study of the feasibility of utilizing small active probes for radiated measurements in shielded enclosures, and (4) study of the feasibility of reducing the terminal impedance of short dipole antennas by dielectric loading. Results from experiments to determine the effects of the surface texture, conductivity and thickness of the lossy-wall material on the coupling characteristics in shielded enclosures indicate that the coupling characteristics are not strongly dependent on changes in any of the above parameters over the ranges investigated. The results also show that the undesired coupling effects are significantly reduced from the high-Q enclosure level with all of the lossy-wall materials investigated. The results from a measurement program to determine the effects of a shielded enclosure on electrically-small equipment cases indicate that small equipment cases may interact strongly with shielded enclosures near enclosure resonant mode frequencies.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1972
- Accession Number
- AD0906195
Entities
People
- J. L. Birchfield
- W. R. Free
Organizations
- Georgia Tech