Patent ID: 8269668

Claim:
An antenna system, comprising: two dual polarised, tilt adjustable antennas with a physical separation providing a space diversity: wherein each antenna has first and second tilt angle controls for independent control of first and second electrical tilt angles of first and second polarisation antenna beams respectively, wherein the first and second polarisation antenna beams have first and second polarisation respectively, wherein the first and second polarisations are orthogonal; and wherein the first and second electrical tilt angles of the first and second polarisation antenna beams are controllable to provide one of: a co-polarisation tilt coupling, wherein the co-polarisation tilt coupling comprises an operational state in which a first electrical tilt angle is applied to both of the first polarisation antenna beams from the first and second antennas respectively and in which a second electrical tilt angle is applied to both of the second polarisation antenna beams from the first and second antennas respectively; and an anti-polarisation tilt coupling, wherein the anti-polarisation tilt coupling comprises an operational state in which a respective electrical tilt angle is applied to each polarisation antenna beam of the first antenna to be the same as a corresponding respective electrical tilt angle that is applied to a respective opposite polarisation antenna beam of the second antenna.