The invention discloses a
frequency selection surface unit, a
frequency selection surface and a
frequency selection method. The frequency selection surface unit comprises a first electromagnetic
dipole antenna and a second electromagnetic
dipole antenna, the first electromagnetic
dipole antenna is arranged above the second electromagnetic
dipole antenna, and the first electromagnetic
dipole antenna and the second electromagnetic
dipole antenna are connected in a back-to-back manner so as to form a tightly coupled antenna which is small in spacing and has dual polarization; the first electromagnetic dipole antenna comprises a first filtering antenna and a first
metal column; the first filtering antenna is fixedly connected with the first
metal column; the second electromagnetic dipole antenna comprises a second filtering antenna, a second
metal column and a floor structure, and the second filtering antenna is fixedly connected with the second metal column; according to the invention, the first electromagnetic dipole antenna and the second electromagnetic dipole antenna are set as
broadband antennas with filtering characteristics, and the filtering characteristics of the antennas are realized under the condition that the thickness of the antennas and an additional circuit structure are not increased, so that the frequency
selective surface has the characteristics of low thickness,
high selectivity and
broadband.