Accession Number : ADD006522

Title :   Metallic Grating Spatial Filter for Directional Beam Forming Antenna.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Schell ,Allan C ; Mailloux,Robert J

Report Date : 25 Sep 1979

Pagination or Media Count : 11

Abstract : Sidelobe suppression and other beam transmission property manipulations in directional beam forming antennas is accomplished by means of a spatial filter. The filter geometry consists of a plurality of metallic gratings separated by air or other low dielectric constant dielectric substance. The filter is placed directly over the antenna radiating aperture and is encompassed by a tunnel structure of electromagnetic wave energy absorbing material. The shunt susceptance characteristics of the metallic gratings together with the integrating spacing distances are synthesized in a manner that effects full transmission of beam power in a selected beam direction while offering substantial rejection of it in other directions. (Author)

Descriptors :   *Patents, *Directional antennas, Spatial filtering, Electromagnetic wave filters

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE