A precise GNSS
directional antenna includes a reflection cavity, a
radiation lower patch, a
radiation upper patch, four L-shaped
metal feed probes, a first supporting column, a second supporting column and a
choke groove. The reflection cavity is a
hollow cylinder of which a bottom surface is closed, height of the reflection cavity is a little bit lower than the
radiation upper patch and higher than the radiation lower patch, the radiation lower patch is higher than the L-shaped
metal feed probes and concentrically connected with an inner bottom surface of the reflection cavity by the second supporting column, and the radiation upper patch is concentrically connected with the radiation lower patch by the first supporting column. The four L-shaped
metal feed probes are installed on an inner bottom surface of a transmitting cavity and uniformly distributed on same circle. The bottom surface of the reflection cavity is installed on the
choke groove, the
choke groove is a pyramidal structure, height of four choke rings decreases progressively from the inside to the outside, and each choke ring has equal depth and equal interval. The precise GNSS
directional antenna has wider beam coverage capability and strong multi-path
interference resistance in low elevation direction, and is suitable for a precise
positioning system.