Differential feed three-frequency planar antenna

The utility model discloses a differential feed three-frequency planar antenna, which comprises a reflecting plate, a supporting structure, a dielectric substrate, a first feeder line, a second feederline and an antenna radiation unit, the reflecting plate is a base; the dielectric substrate is fixed on the reflecting plate through a supporting structure; the supporting structure comprises M supporting columns, and the supporting columns are made of insulating materials. The antenna radiation unit is etched on the dielectric substrate and comprises a low-frequency oscillator, a first intermediate-frequency oscillator, a second intermediate-frequency oscillator, a first high-frequency oscillator, a second high-frequency oscillator, a coplanar microstrip line and a microstrip line feed structure. According to the utility model, a differential feed structure is combined with a planar structure, so that the antenna can be conveniently combined with a differential radio frequency front endto realize three-frequenc