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:
Mar. 09, 2004
Filed:
Sep. 06, 2002
Applicant:
Inventors:
John R Sambles, Exeter, GB;
Christopher R Lawrence, Farnborough, GB;
Assignee:
QinetiQ Limited, Farnborough, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01Q 1/906 ;
U.S. Cl.
CPC ...
H01Q 1/906 ;
Abstract
A grating comprising a plurality of substantially parallel members having a conducting surface of depth L, separated by a dielectric layer gap, and having of pitch &lgr; and where L>16&lgr; . The members are preferably metallic or comprise metallic foil covered plastic. The gap may be filled wholly or partially with dielectric material including liquid crystal whose refractive index can be controlled by suitable application of voltage across the gap.