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本文提出一种窄波束夹角的W波段双波束天线设计方法。通过调节卡塞格伦天线馈源对副面照射角的方法,来减小波束偏移角以实现窄波束夹角。文章分析了天线结构几何参数对波束偏移的影响,设计出口径mD为150mm的78GHz卡塞格伦双波束天线,3dB波束宽度约为1.64°,两波束夹角为2°。
This paper presents a narrow beam angle W-band dual-beam antenna design. By adjusting the Cassegrain antenna feed on the secondary radiation angle approach to reduce the beam offset angle to achieve a narrow beam angle. The influence of antenna geometry parameters on beam migration is analyzed. A 78GHz Cassegrain dual-beam antenna with mD of 150mm is designed. The 3dB beamwidth is about 1.64 ° and the angle between two beams is 2 °.