An antenna array of a high frequency antenna device includes a plurality of subarrays having the same arrangement. Each subarray includes antennas arranged in rows. Any two adjacent antennas of each of the subarrays respectively have two central points spaced apart from each other by a first interval, and any two adjacent antennas respectively belonging to two of the subarrays respectively have two central points spaced apart from each other by a second interval equal to the first interval. The antenna array is operated in at least one of operation modes, and the operation modes include: any subarray is wirelessly communicated with an external electronic device spaced apart from the corresponding subarray by a first distance; and at least two adjacent subarrays are jointly cooperated to wirelessly communicate with an external electronic device spaced apart from the corresponding subarrays by a second distance greater than the first distance.