S-frequency range four-point feed circular polarization patch antenna with three-dimensional feed network

The utility model discloses an S-frequency range four-point feed circular polarization patch antenna with a three-dimensional feed network. The feed network is composed of three rectangular coaxial linear hybrid rings which are in cascade connection and arranged abreast vertically, each of the coaxial linear hybrid rings is in a square air coaxial cable form, equal-amplitude signals input from input ports of three coaxial linear hybrid rings are distributed to two output ports in a reverse phase manner, two input ports of two coaxial linear hybrid rings located on outer sides are respectively connected with a phase shift section, and the length of the phase shift section which is connected with output ports with advanced phase is lambda fourth larger than that of the phase shift section which is connected with output ports with hysteretic phase. Since the feed network is in a three-dimensional structure, and the common annular structure of the three coaxial linear hybrid rings is changed into the rectangular structure, the three coaxial linear hybrid rings can be directly butted when combined into a network, extra connecting transmission wires are omitted, and the network is compact in structure, small in size, easy to process. Besides, the problem that an array antenna is oversized crosswise is effectively solved.