Double-fed double-frequency GNSS antenna

The invention discloses a double-fed double-frequency GNSS antenna, which is mounted on automobile skylight glass to avoid the problems of influence on the appearance of an automobile and interference, and comprises a glass substrate consisting of upper glass, lower glass and a gelatinous layer, the gelatinous layer is arranged between the upper glass and the lower glass, an antenna unit is loaded on the glass substrate, and the antenna unit is mounted on the glass substrate. The antenna unit comprises a one-to-four feed network, a large circle, a small circle and a PCB layer, the one-to-four feed network is arranged on the PCB layer, and the PCB layer is arranged on the glass substrate; the one-to-four feed network comprises two L-shaped feed units, an inverted-T-shaped feed unit, a rectangular feed unit and a grounding feed unit, the tails of the inverted-T-shaped feed unit, the rectangular feed unit and the L-shaped feed units are all connected with the 90-degree phase difference chip, and the grounding fe