A New Method of Calibrating Field Strength Measuring Equipment
Abstract
A new method of calibrating radio interference and field strength measuring equipment employing shielded loop antennas ha s been developed. It is based on the concept of the shielded loop antenna acting as a unity coupled transformer; the shield being the primary and the inner conductor the secondary. It is assumed that the loop dimensions are small compared to the wavelength, that the shield is made of a highly conductive non-ferrous material, and that the inner turns do not approach resonance when open circuited. The calibrating signal is injected into the loop shield across the shield gap. This signal voltage is equal to the voltage that would be induced in the shield of the loop by an electromagnetic field of the intensity at which it is desired to calibrate the equipment. The principal advantages of this method are: simplicity, wide range of calibration levels, and adaptability to field use.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 14, 1952
- Accession Number
- AD1062007
Entities
People
- Harold E. Dinger
- William E. Garner
Organizations
- United States Naval Research Laboratory