Antenna array device

An antenna array device, comprising:

• a substrate, comprising a first surface and a second surface;
• a plurality of antenna elements, disposed on the first surface, wherein the plurality of antenna elements have a first polarization direction and a second polarization direction opposite to the first polarization direction, and the plurality of antenna elements have a first via respectively;
• a metal ground plate, disposed on the second surface;
• and
• a first isolation unit group, disposed on the first surface, and disposed between adjacent two of the plurality of antenna elements, wherein an arrangement direction of the first isolation unit group is perpendicular to the first polarization direction and the second polarization direction, wherein the first isolation unit group is two isolation units which are disposed adjacent to each other along a direction perpendicular to the first polarization direction and the second polarization direction, each of the two isolation units comprises an outer end and an inner end opposite to the outer end, and the inner end is connected to the metal ground plate via a second via,
• wherein each one of the two isolation units is composed of a metal strip, and a length of the metal strip in the direction perpendicular to the first polarization direction and the second polarization direction is a quarter wavelength of center frequency of a resonance frequency band of the plurality of antenna elements,
• wherein a distance between the two isolation units disposed on the first surface of the substrate is less than one-twentieth wavelength of center frequency of a resonance frequency band of the plurality of antenna elements, and
• wherein each of the plurality of antenna elements comprises an edge, and a length of a separation distance between the first isolation unit group and one of the antenna elements that is adjacent to the first isolation unit group is one-third of length of the edge of each of the plurality of antenna elements.