Antenna and Array Antenna

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

• a first radiating element and a second radiating element, wherein the first radiating element comprises four dipoles enclosing the second radiating element in a plan view, and the second radiating element is disposed on an inner side of the first radiating element;
• and
• wherein, for each antenna of the plurality of antennas, the first radiating element of the respective antenna is configured to support a transmit frequency band, and the second radiating element of the respective antenna is configured to support a receive frequency band;
• or the first radiating element of the respective antenna is configured to support the receive frequency band, and the second radiating element of the respective antenna is configured to support the transmit frequency band.