Patent ID: 8798679

Claim:
A mobile communication base station antenna, comprising: a plurality of polarization diversity antenna blocks which carries out Multiple Input Multiple Output (MIMO) communication, each of the polarization diversity antenna blocks comprising a plurality of polarization diversity antenna elements, each of the polarization diversity antenna elements comprising antenna elements that are disposed to be orthogonal to each other, wherein the plurality of the polarization diversity antenna blocks comprise at least one first polarization diversity antenna block including polarization diversity antenna block elements and at least one second polarization diversity antenna block including polarization diversity antenna elements, and the polarization diversity antenna elements of the first polarization diversity antenna block are located outside the second polarization antenna block, wherein tilt angles in a vertical plane of respective polarization diversity antenna blocks are different from each other, wherein, in a plan view, centers of the polarization diversity antenna elements of said at least one first polarization diversity antenna block are located between centers of the polarization diversity antenna elements of said at least one second polarization diversity antenna block in an overlapped area of the antenna, and wherein, in the plan view, a part of the polarization diversity antenna elements of said at least one first polarization diversity antenna block and a part of the polarization diversity antenna elements of said at least one second polarization diversity antenna block are located outside the overlapped area of the antenna.