Active ceramic antenna, can be used to receive right-hand circularly polarized satellite signals in GPS L1, BD2 B1, GLONASSL1 bands. The antenna adopts double-fed ceramic plus bridge, with good antenna axial ratio, good overlap of phase center and geometric center, suitable for high-precision positioning, and adopts pre-filter, good out-of-band suppression, and strong anti-interference ability. Application areas: driving test, driving training, special vehicles, RTK surveying and mapping, and high-precision equipment.