An antenna system, wherein the antenna system comprises: a ground plate (110, 410, 510, 1210), at least one antenna pair (120-122, 1220) disposed on the ground plate, and a decoupling assembly disposed on a radiation surface of the antenna pair, wherein the antenna pair (120-122, 1220) comprises a first antenna (121, 421, 521, 610, 810, 1010) and a second antenna (122,422, 522, 620, 820, 1020); the decoupling assembly has electrical anisotropy, and the electrical anisotropy indicates that an effective permittivity of the decoupling assembly has different components in different directions; the decoupling assembly is configured to adjust antenna radiation directions of the first antenna (121, 421, 521, 610, 810, 1010) and the second antenna (122, 422, 522, 620, 820, 1020); and isolation between the first antenna (121, 421, 521, 610, 810, 1010) and the second antenna (122, 422, 522, 620, 820, 1020) after adjustment is greater than isolation between the first antenna and the second antenna before adjustment, wherein the decoupling assembly is in a laminated structure; the laminated structure is formed by alternately stacking at least two materials, and permittivities of the at least two materials are different; and a sum of thicknesses of the at least two materials is less than a half wavelength corresponding to an operating frequency of the antenna pair (120-122, 1220), characterized in that | ε ⊥ |<| ε ∥ |, | ε ⊥ | is an effective permittivity of the laminated structure in a perpendicular direction, ε ∥ is an effective permittivity of the laminated structure in a parallel direction, the parallel direction is a direction orthogonal to the stacking direction of the laminated structure, and the perpendicular direction is the stacking direction of the laminated structure. a ground plate (110, 410, 510, 1210), at least one antenna pair (120-122, 1220) disposed on the ground plate, and a decoupling assembly disposed on a radiation surface of the antenna pair, wherein the antenna pair (120-122, 1220) comprises a first antenna (121, 421, 521, 610, 810, 1010) and a second antenna (122,422, 522, 620, 820, 1020); the decoupling assembly has electrical anisotropy, and the electrical anisotropy indicates that an effective permittivity of the decoupling assembly has different components in different directions; the decoupling assembly is configured to adjust antenna radiation directions of the first antenna (121, 421, 521, 610, 810, 1010) and the second antenna (122, 422, 522, 620, 820, 1020); and isolation between the first antenna (121, 421, 521, 610, 810, 1010) and the second antenna (122, 422, 522, 620, 820, 1020) after adjustment is greater than isolation between the first antenna and the second antenna before adjustment, wherein the decoupling assembly is in a laminated structure; the laminated structure is formed by alternately stacking at least two materials, and permittivities of the at least two materials are different; and a sum of thicknesses of the at least two materials is less than a half wavelength corresponding to an operating frequency of the antenna pair (120-122, 1220), characterized in that | ε ⊥ |<| ε ∥ |, | ε ⊥ | is an effective permittivity of the laminated structure in a perpendicular direction, ε ∥ is an effective permittivity of the laminated structure in a parallel direction, the parallel direction is a direction orthogonal to the stacking direction of the laminated structure, and the perpendicular direction is the stacking direction of the laminated structure.