Dual polarity antenna

An antenna array comprising a plurality of dual polarity antennas, wherein each dual polarity antenna of the plurality of dual polarity antennas comprises:

• a dual polarity radiator, comprising a first radiator having a first polarity and a second radiator having a second polarity orthogonal to the first polarity;
• an ancillary radiator;
• and
• a feeding network for feeding a radio-frequency (RF) signal to both the first radiator and the ancillary radiator, driving the first radiator to radiate a wave having a first polarisation, causing radiation of a spurious wave having a polarisation orthogonal to the first polarisation, and driving the ancillary radiator to radiate a wave that cancels the spurious wave at least partly.

A method of transmitting a radio-frequency (RF) signal, the method comprising:

• feeding the RF signal to a first radiator having a first polarity and to a first ancillary radiator;
• driving the first radiator to radiate a wave having a first polarisation;
• causing radiation of a spurious wave having a polarisation orthogonal to the first polarisation;
• and
• driving the first ancillary radiator to radiate a wave that cancels the spurious wave at least partly.