基于螺纹槽结构的90°波纹喇叭性能研究

为了拓宽宽带通信天线波纹喇叭馈源的工作频带，设计了一款新型90°波纹喇叭，它的波纹槽以阿基米德螺线的轮廓向外扩展. 仿真和测试结果表明:该新型波纹喇叭最优工作带宽可达2∶1，在10~20 GHz的工作频带内，具有稳定的相位中心，其45°面最大交叉极化电平低于?25 dB；在宽频带内波束宽度保持相对恒定，且天线E面和H面辐射方向图的?10 dB波束宽度非常接近. 该新型波纹槽可以在宽频带内使得喇叭的辐射方向图更为对称，是改善波纹喇叭性能的新思路.

Research on 90° corrugated-horn antenna with spiral slots

In order to meet the requirement of the broadband communication system, a novel broadband 90° corrugated-horn antenna is proposed. The corrugations of the horn expand outward in the shape of Archimedes spiral.Simulated and measured results indicate that the optimal bandwidth of the new corrugated horn can reach 2∶1. Over the frequencies from 10 GHz to 20 GHz, the proposed antenna can produce the relatively-the-same phase center with low cross-polarization levels in 45° plane below ?25 dB. In the wide frequency band, the beamwidth is relative constant and the ?10 dB beamwidth of E-plane and H-plane is very close. The proposed design of corrugated slots can make the radiation pattern of the horn more symmetrical in a wide frequency band, which is a new idea to improve the performance of corrugated horn.