Antenna, antenna array, and communications device

An antenna array, comprising:

• a first antenna;
• and
• a second antenna;
• wherein the first antenna, comprises:
• a radiation part is a structure including one or more frequency selection units, each frequency selection unit having a bandpass characteristic,
• a feeding part, wherein the feeding part is coupled to the radiation part, and is configured to feed power to the radiation part, and
• wherein the radiation part is to excite coupling currents that appear in a plurality of pairs when a high-frequency signal passes through, wherein each pair of coupling currents cancels each other;
• where an operating frequency of the second antenna is a frequency of the high-frequency signal, an operating frequency of the first antenna is lower than the operating frequency of the second antenna, and a frequency selection unit in the first antenna has a bandpass characteristic to the operating frequency of the second antenna.

A communications device, comprising an antenna array, wherein the antenna array further comprise:

• at first antenna;
• and
• at second antenna;
• wherein each of the at least first antenna comprises:
• a radiation part is a structure including one or more frequency selection units, each frequency selection unit having a bandpass characteristic,
• a feeding part, wherein the feeding part is coupled to the radiation part, and is configured to feed power to the radiation part, and
• wherein the radiation part is to excite coupling currents that appear in a plurality of pairs when a high-frequency signal passes through, wherein each pair of coupling currents cancels each other;
• where an operating frequency of the second antenna is a frequency of the high-frequency signal, an operating frequency of the first antenna is lower than the operating frequency of the second antenna, and a frequency selection unit in the first antenna has a bandpass characteristic to the operating frequency of the second antenna.