为了满足实际干扰测试需求,设计了一款脊上开槽的超宽带高增益双脊喇叭天线。首先，首次引入二次Bezier 曲线作为脊的渐变曲线并验证了该曲线的可行性，天线的电压驻波比(VSWR)带宽为2 GHz ~18 GHz；然后，通过加入楔形块和采用锥形渐变脊，成功地解决了天线高频增益下降和辐射方向图畸变的问题；最后，通过在脊上开锥形槽，进一步降低了低频段的VSWR。仿真结果表明天线在2 GHz~18 GHz 内的VSWR小于1. 9，在5 GHz~17 GHz 内小于1. 5，且在不加载介质透镜的情况下,高频增益稳定在18 dBi 以上。实测结果表明天线的VSWR 和增益与仿真结果吻合，可用于天线干扰测量系统和高增益反射面天线的馈源。

In order to meet the requirements of practical interference test, an ultra-wideband high-gain double-ridged horn antenna with slot on the ridge is proposed. Firstly, the quadratic Bezier curve is introduced as the gradient curve of the ridge for the first time and the feasibility of the curve is verified, and the voltage standing wave ratio (VSWR) bandwidth of antenna is 2 GHz~18 GHz. Then,the problems of antenna high-frequency gain degradation and radiation pattern distortion are solved successfully by adding wedge-shaped blocks and adopting conical gradient ridge. Finally, the VSWR at low frequency band is further reduced by making tapered slots on the ridge. The simulation results show that the VSWR of the antenna is less than 1. 9 in 2 GHz~18 GHz and less than 1. 5 in 5 GHz~17 GHz. In addition, the high-frequency gain is stable above 18 dBi without loading the dielectric lens. Prototype measurement results show that the VSWR and gain of the antenna are well agreement with the simulation ones. The antenna can be used in antenna interference measurement systems and as a feed source of high gain reflector antennas.

TN82