A Novel Millimeter-wave Reflector Antenna with Sum-difference Network

To solve the problems of feed occlusion and asymmetry of Millimeter-wave antenna with the sum-difference network, a new type of box reflector antenna for 77 GHz MMW radar is proposed in this paper. The antenna extends the edge of the horn feed into a single-ear structure with the shape of a pyramidal horn by changing the structure of the general horn feed. The experimental results show that the sum-beam gain of the receiving antenna is greater than 26 dBi, the sidelobe level (SLL) is -20.77 dB, and the difference-beam null depth of the receiving antenna is -45.18 dB. It is indicated that compared with the general antenna, the proposed antenna obtains high gain, low sidelobe, low null depth and highly symmetrical sum-difference beam in radar application.