An antenna system, comprising a substrate, the antenna system comprising: a first antenna array configured to be coupled to a first radio card (RC_1), the first antenna array comprising a plurality of horizontal antennas (H_ANT) operating at a first frequency band and having a first polarization direction; and a second antenna array configured to be coupled to a second radio card (RC_2), the second antenna array comprising a plurality of dual-band antennas (D_ANT) operating at the first frequency band and a second frequency band, and each one of the plurality of dual-band antennas (D_ANT) comprises: a vertical radiating element operating at the first frequency band and having a second polarization direction orthogonal to the first polarization direction; and a horizontal radiating element coupled to the vertical radiating element, operating at the second frequency band, and having the first polarization direction; wherein the first antenna array and the second antenna array are arranged on the substrate such that a first antenna pattern formed by the first antenna array and a second antenna pattern formed by the second antenna array are mutually orthogonal; wherein the first antenna array and the second antenna array are arranged as linear arrays, the first antenna array is disposed adjacent to a first edge of the substrate, and the second antenna array is disposed adjacent to a second edge of the substrate, and the second edge is opposite to the first edge (L 1); wherein the antenna system is characterized in that: the first antenna array and the second antenna array are arranged as a first straight linear array (LA_1) and a second straight linear array (LA_2), respectively, a first dual-band antenna of the second antenna array is rotated by a first angle, and a second dual-band antenna of the second antenna array is rotated by a second angle. a first antenna array configured to be coupled to a first radio card (RC_1), the first antenna array comprising a plurality of horizontal antennas (H_ANT) operating at a first frequency band and having a first polarization direction; and a second antenna array configured to be coupled to a second radio card (RC_2), the second antenna array comprising a plurality of dual-band antennas (D_ANT) operating at the first frequency band and a second frequency band, and each one of the plurality of dual-band antennas (D_ANT) comprises: a vertical radiating element operating at the first frequency band and having a second polarization direction orthogonal to the first polarization direction; and a horizontal radiating element coupled to the vertical radiating element, operating at the second frequency band, and having the first polarization direction; a vertical radiating element operating at the first frequency band and having a second polarization direction orthogonal to the first polarization direction; and a horizontal radiating element coupled to the vertical radiating element, operating at the second frequency band, and having the first polarization direction; wherein the first antenna array and the second antenna array are arranged on the substrate such that a first antenna pattern formed by the first antenna array and a second antenna pattern formed by the second antenna array are mutually orthogonal; wherein the first antenna array and the second antenna array are arranged as linear arrays, the first antenna array is disposed adjacent to a first edge of the substrate, and the second antenna array is disposed adjacent to a second edge of the substrate, and the second edge is opposite to the first edge (L 1); wherein the antenna system is characterized in that: the first antenna array and the second antenna array are arranged as a first straight linear array (LA_1) and a second straight linear array (LA_2), respectively, a first dual-band antenna of the second antenna array is rotated by a first angle, and a second dual-band antenna of the second antenna array is rotated by a second angle.