Characteristics of a half-turn loop antenna having a Faraday shield have been systematically investigated. The main interest is to clarify the Faraday shield effects on the near-zone electric field distribution. For analytical simplicity, a loop antenna located on an infinite conducting plane and radiating into semi-infinite vacuum space has been analyzed by using the moment method. Some important results have been obtained: In the presence of the Faraday shield, undesirable field components have been confirmed to be sufficiently suppressed and the heating component Ey, which otherwise is strongly localized as an end effect, has been found to be distributed uniformly along the antenna in the case of a short electric length. It is found that the shielding strips should be uniformly distributed over the entire region around the half-turn loop antenna. An experimental investigation is also performed to confirm the validity of the analysis.
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Condensed Matter Physics