The invention belongs to the technical field of satellite communication, and particularly relates to a dual-frequency broadband wide-angle circularly polarized gate based on a miniaturized unit. The dual-frequency broadband wide-angle circularly polarized gate effectively solves the problem of poor incident angle stability of the dual-frequency circularly polarized gate on the premise of ensuringbroadband and low insertion loss, and is especially suitable for a double-frequency scanning circular polarization satellite communication system with large capacity, low loss and high incident anglestability. According to the invention, a composite structure of short microstrip lines and metal wire grids is fully utilized, so that the cross polarization inhibition capability can be greatly enhanced, the bandwidth is easy to expand, and the insertion loss is easy to reduce; meanwhile, four short branches are loaded at the tail ends of the I-shaped short microstrip line to form a deformed I-shaped short microstrip line, so that the unit size can be further reduced to 0.13 * 0.18 working wavelengths, and the incident angle stability is remarkably improved; and the insertion loss of the polarized gate at the dual-band center frequency point is only 0.5 dB and 1.5 dB, the relative axial ratio bandwidths are as high as 33% and 12% respectively, and the maximum working incident angle is increased to 45 degrees, which is remarkably superior to 25 degrees in the prior art.