A Lobing Array for IFF Mark 5
Abstract
A seven element lobing antenna array for IFF Mark V has been designed for installation on the reflector of the Fire Control Radar Mark 12. The dipoles are mounted in a trough-shaped screen 15 inches high by 56 inches long, while the feed system comprises a three-section lober, a polyethylene filled power division transformer, and several lengths of RG-8/U cable. The beam widths in the horizontal plane vary from 15 1/2 to 13 degrees across the 950 to 1150 Mc band, and the sharpness of the main crossover increases from 1.3 to 2.3 db per degree. All false crossovers are 20 db or more below the principal on except at 1000 Mc, where they are 17 db down. The input standing wave ratio is less than 2.5 db except at this frequency, where it reaches 3.1. db. It is estimated that the installed weight of the antenna will be 39 pounds. Eight models are being manufactured at the Naval Ordnance Laboratory for use in evaluation tests of the IFF Mark V system in July 1947.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 15, 1947
- Accession Number
- AD1203341
Entities
People
- R. J. Adams
Organizations
- United States Naval Research Laboratory