3dB bridge-based wideband integrated microstrip antenna

The invention discloses a 3dB bridge-based wideband integrated microstrip antenna. The microstrip antenna comprises at least a first substrate. According to the first substrate, a dual-feedpoint modeis adopted; a 3dB bridge is adopted as a power division network; the first substrate can be adopted either as a left-hand circularly polarized antenna or as a right-hand circularly polarized antenna by means of a condition that the phases of the different feeding ports of the 3dB bridge are different when the different feeding ports of the 3dB bridge are used to feed electricity; when the first substrate is adopted as the left-hand circularly polarized antenna, the first substrate is a Beidou No. 1 transmitting antenna; and when the first substrate is adopted as the right-hand circularly polarized antenna, the first substrate is a GPS positioning antenna. With the 3dB bridge-based wideband integrated microstrip antenna of the invention adopted, a multi-frequency antenna can be integrated on one substrate in an int