AN INVESTIGATION OF THE HF WIRE-GRID LENS ANTENNA FOR DIRECTION FINDING

摘要

This is the final Technical Documentary Report on Contract AF3O(602)-2742, FSC-0082, which nas as its purpose the theoretical investigation of the HF Wire-Grid Lens Antenna for use as an HF direction-finding antenna. In Technical Documentary Report 1, the refractive index of double-square wire-mesh grids vas calculated and a ray-tracing technique developed for synthesizing a lens having a prescribed refractive index in an annular region. Technical Documentary Report 2 described a feed for exciting the wire-grid lens, called a "ramp feed," which is electrically equivalent to an end-fire array of electric dipoles. Using ray-tracing techniques, rad-iation patterns of the wire-grid-lens radiating into a matched transmission line region are calculated when it is excited by a ramp feed.