Metallic grating spatial filter for directional beam forming ant

Details Metallic grating spatial filter for directional beam forming ant Metallic grating spatial filter for directional beam forming ant

1978-05-11

1979-09-25

Lieberman, Eli

Communications: radio wave antennas

Antennas

Antenna components

H01Q 1510

Patent

active

041692683

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.

REFERENCES:
patent: 2684725 (1956-07-01), Kock
patent: 2756424 (1956-07-01), Lewis et al.
patent: 2763860 (1956-09-01), Ortusi et al.
patent: 3708796 (1973-01-01), Gilbert

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