MULTI-BEAM ANTENNA DEVICE

• Main Authors: OOTA MASAHIKO, NOMURA TAKETO
• Format: Patent
• Language: English
• Published: 06.10.2011
• Subjects: ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; ELECTRICITY

Provided is a multi-beam antenna device capable of suppressing an increase in loss of a Rotman lens so as to achieve enhanced gain. with respect to α is set to satisfy the following relation: <α, where: is a spatial beam-forming angle of an array antenna when viewed from a direction facing a front of the array antenna; and α is an angle between a center line (8) of a Rotman lens, and a line segment which connects one of a plurality of input ports and an intersecting point S2 of the center line (8) with a curve segment having a plurality of output ports (31), (32), - - - , (3n) arranged thereon. Further, a shape of the Rotman lens is set to satisfy the following relation: =( /α)·(Ln/F)<1, and reduce G to less than a value of G when designed under a condition of =α, where: F is a distance between the one input port (21) and S2; 2 Ln is an aperture length of the array antenna; and G is a size of the Rotman lens, and defined as a distance between S2 and S3 (wherein S3 is an intersecting point of the center line (8) with a curve segment having the input ports (21), (22), - - - , (2m) arranged thereon).