The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 02, 1982
Filed:
Apr. 08, 1980
Thomas W Kornbau, Poway, CA (US);
General Dynamics, Electronics Division, San Diego, CA (US);
Abstract
An angle filter for electromagnetic radiation having a predetermined wavelength .lambda.. The angle filter includes a planar-parallel pair of perforated conductive plates having arrays of periodic perforations. The perforations are spaced apart for creating grating lobes between the plates at the predetermined wavelength .lambda. at incidence angles greater than .theta..sub.G. All of the perforations in both plates are identical. The spacing between the perforations in both plates is identical. The plates are staggered so that the perforations in at least one dimension of one plate are aligned between the perforations in the corresponding dimension of the other plate for minimizing coupling between the plates at incidence angles somewhat greater than .theta..sub.G in a plane corresponding to the one dimension. The center-to-center spacing between perforations in the one dimension is equal to .lambda. divided by 2 sin .theta., wherein .theta. is an incidence angle greater than .theta..sub.G. In an embodiment in which the plates contain the periodic perforations in two normal dimension, which define E and H-planes, the plates are staggered so that the perforations in both dimensions of one plate are aligned between the perforations in the corresponding dimensions of the other plate for minimizing coupling between the plates over a range of incidence angles in both the E and H-planes.