A wideband high gain circularly polarized RFID antenna

A wideband high gain circularly polarized RFID antenna is provided. The invention relates to the technical field of communication, and the antenna comprises a metal radiation plate, a vibrator plate combination structure, a metal reflection plate and a feeding network, wherein the vibrator plate combination structure comprises a first vibrator plate partially copper-coated on one side and a secondvibrator plate partially copper-coated on one side, wherein the first vibrator plate and the second vibrator plate are vertically nested; The antenna is a universal circularly polarized RFID antennawith high gain, small axis ratio and low standing wave, which can cover the global UHF RFID operating frequency band (840-960MHz). The antenna height is only 0.1 lambda, and the metal radiator size isonly 0.35 lambda. The antenna has the characteristics of low stripping and small aperture, and is easy to be integrated into the system. A feed network is composed of coaxial cables, and the antennais simple in structure and e