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:
Apr. 15, 2014
Filed:
Nov. 30, 2009
Masahiko Oota, Chikusei, JP;
Taketo Nomura, Chikusei, JP;
Masahiko Oota, Chikusei, JP;
Taketo Nomura, Chikusei, JP;
Hitachi Chemical, Ltd., Tokyo, JP;
Abstract
A multi-beam antenna suppressing an increase in loss of a Rotman lens to achieve enhanced gain. β<α, where: β is a spatial beam-forming angle of an array antenna viewed from the a front of the antenna; and α is an angle between a center line of a Rotman lens, and a line segment connecting one of the input ports and an intersecting point Sof the center line with a curve segment having a plurality of output ports A shape of the Rotman lens such that: η=(β/α)(Ln/F)<1, and G is less than when β=α, where: F is a distance between one input port and S; 2 Ln is an aperture length of the array antenna; and G is a size of the Rotman lens, defined as a distance between Sand an intersecting point of the center line with a curve segment having input ports.