Planar array antenna structure

[0051]Reference will now be made to the drawing figures to describe the present invention in detail.

[0052]Reference is made to FIG. 1, FIG. 2, and FIG. 3 which are a schematic front view, a schematic rear view, and a schematic view of a substrate of a planar array antenna structure according to the present disclosure. The planar array antenna structure includes a substrate 1, an array antenna 2, and a bottom ground portion 3.

[0053]The substrate 1 has a front surface 11 and a rear surface 12. In particular, the substrate I is a polyester fiberglass board.

[0054]The array antenna 2 is composed of a plurality of antenna units 21 and disposed on the front surface 11 of the substrate 1, and the antenna units 21 are disposed on the front surface 11 of the substrate 1 in a symmetrical and polygonal arrangement. Also, a spaced slot 22 is formed between every two antenna units 21. Each antenna unit 21 includes a top ground portion 211, a main radiator 212, and an auxiliary radiator 213. The top