An antenna, comprising: a first-layer antenna, a second-layer antenna, a first probe, a second probe, a first connector, and a second connector, wherein main bodies of the first-layer antenna and the second-layer antenna are both planar insulation sheets, the main bodies of the first-layer antenna and the second-layer antenna are provided with a first annular microstrip patch and a second annular microstrip patch respectively, the first annular microstrip patch attached to the first-layer antenna is provided with a first feeding line and a second feeding line, wherein the first feeding line and the second feeding line are integrally formed with the first annular microstrip patch; the main bodies of the first-layer antenna and the second-layer antenna are connected to each other by using an insulator column, and the first-layer antenna is parallel to and centrally aligned with the second-layer antenna; the first-layer antenna is connected to the first probe and the second probe by using the first feeding line and the second feeding line respectively, the first probe and the second probe are both rod-like and are parallel to each other, and the first probe and the second probe point to the second-layer antenna from a contact point between the first probe and the first-layer antenna and a contact point between the second probe and the first-layer antenna as start points respectively; the first-layer antenna is connected to the first connector and the second connector, wherein a position of the first connector corresponds to a position where the first probe is connected to the first-layer antenna, and a position of the second connector corresponds to a position where the second probe is connected to the first-layer antenna; the first connector and the second connector are configured to receive a first antenna signal current and a second antenna signal current respectively; the first probe and the second probe are configured to form vertical dipoles based on the first antenna signal current and the second antenna signal current respectively; and the first-layer antenna and the second-layer antenna are configured to generate a feedback signal current based on vertical dipole fields through the first and the second annular microstrip patches. a first-layer antenna, a second-layer antenna, a first probe, a second probe, a first connector, and a second connector, wherein main bodies of the first-layer antenna and the second-layer antenna are both planar insulation sheets, the main bodies of the first-layer antenna and the second-layer antenna are provided with a first annular microstrip patch and a second annular microstrip patch respectively, the first annular microstrip patch attached to the first-layer antenna is provided with a first feeding line and a second feeding line, wherein the first feeding line and the second feeding line are integrally formed with the first annular microstrip patch; the main bodies of the first-layer antenna and the second-layer antenna are connected to each other by using an insulator column, and the first-layer antenna is parallel to and centrally aligned with the second-layer antenna; the first-layer antenna is connected to the first probe and the second probe by using the first feeding line and the second feeding line respectively, the first probe and the second probe are both rod-like and are parallel to each other, and the first probe and the second probe point to the second-layer antenna from a contact point between the first probe and the first-layer antenna and a contact point between the second probe and the first-layer antenna as start points respectively; the first-layer antenna is connected to the first connector and the second connector, wherein a position of the first connector corresponds to a position where the first probe is connected to the first-layer antenna, and a position of the second connector corresponds to a position where the second probe is connected to the first-layer antenna; the first connector and the second connector are configured to receive a first antenna signal current and a second antenna signal current respectively; the first probe and the second probe are configured to form vertical dipoles based on the first antenna signal current and the second antenna signal current respectively; and the first-layer antenna and the second-layer antenna are configured to generate a feedback signal current based on vertical dipole fields through the first and the second annular microstrip patches.