The invention provides an omnidirectional dual
circularly polarized antenna with same-side feeding. The antenna comprises a
radiation structure, a similar coaxial
impedance matching structure, and a
radio frequency excitation conversion T-shaped connecting structure, the similar coaxial
impedance matching structure is divided into an upper similar coaxial
impedance matching structure and a lower similar coaxial impedance matching structure, the upper end and the lower end of the
radiation structure are respectively connected with the lower end of the upper similar coaxial impedance matching structure and the upper end of the lower similar coaxial impedance matching structure, the upper end of the upper similar coaxial impedance matching structure is sealed by a
metal disc plate, the lower end of the lower similar coaxial impedance matching structure is connected with the
radio frequency excitation conversion T-shaped connecting structure, and an interface of the
radio frequency excitation conversion T-shaped connecting structure can directly perform radio frequency excitation by employing an SMA joint
feed line. According to the antenna, the omnidirectional performance and the
axial ratio performance are good, a certain working bandwidth of -10dB bandwidth 600M (5.2GHz-5.8GHz) is achieved, and in-band
gain is greater than 5.2dB and can reach 6.7dB to the maximum.