Design of a Dual-polarized High-gain Diagonal Horn Antenna

Asmillimeter-wavedetectionsystemsandunmannedaircrafttestingsystemsrapidly advance, enhancing antenna gain and achieving rotationally symmetric low sidelobe antenna radiation patterns have become a prominent area of research. This paper presents the design of a dual-polarized high-gain diagonal horn antenna. The antenna comprises two main sections: the quad-ridged flared horn feed section and the diagonal horn antenna section. Dual polarization is achieved in the quad-ridged flared horn feed section through an unbalanced feeding method. The diagonal horn antenna section employs the superposition of TE
10
and TE
01
modes to enhance Gaussian coupling, increase antenna gain, and reduce sidelobes. Through simulations, it is demonstrated that within the 4–6GHz frequency range, the antenna exhibits a VSWR below 1.5, a gain exceeding 19.85dBi, sidelobes lower than 25dB, and cross-polarization exceeding 26dB. Practical testing results closely align with the simulated performance.