The possibility of reducing sidelobe levels (SLLs) of the E-plane radiation patterns of high-gain rectangular horn antennas by modifying the field distribution on the aperture is studied in this paper. A simple and efficient method for controlling the field distribution on the aperture is proposed by sectionalizing the aperture and using conductive plates inside the antenna to obtain the required tapering for SLL reduction. The resulting radiation patterns indicate significant SLL reductions and remarkable gain improvements over a wide bandwidth. Looking from another aspect, the proposed method can be used for SLL reduction and length reduction of high-gain rectangular horn antennas in a wide frequency band. Finally, a prototype of the proposed E-plane sectionalized rectangular horn antenna with 9 sections is fabricated and tested, successfully. The SLL of the proposed antenna compared with traditional horn antennas is reduced from above −15 dB to below −20 dB and the gain is improved by up to 1.8 dB. The measured gain is above 24.5 dB at 10 GHz with 1 GHz bandwidth.

本文研究了通过修改孔径上的场分布来降低高增益矩形喇叭天线E平面辐射方向图的旁瓣电平（SLLs）的可能性。通过划分孔径并使用天线内部的导电板来获得减小SLL所需的锥度，提出了一种简单有效的控制孔径场分布的方法。所产生的辐射图表明，在较宽的带宽上，SLL显着降低，增益显着提高。从另一方面来看，所提出的方法可以用于宽频带中的高增益矩形喇叭天线的SLL减小和长度减小。最后，成功制造并测试了所提出的具有9个截面的E平面分段矩形喇叭天线的原型。与传统的喇叭天线相比，拟议天线的SLL从-15 dB以上降低到-20 dB以下，并且增益提高了1.8 dB。在1 GHz带宽下，在10 GHz处测得的增益高于24.5 dB。