基于准行波阵的毫米波引信微带频扫天线

A Frequency Scanning Microstrip Antenna Based on QuasiTraveling Wave Array for Millimeter Wave Fuzes

针对传统毫米波引信天线无法兼顾宽波束、高增益、小尺寸的问题,提出了一种基于准行波阵的毫米波引信微带频扫天线;该天线由5个微带贴片串联构成,天线尺寸仅为20 mm×8 mm,微带贴片之间距离固定,通过频率扫描方式改变天线主波束指向;毫米波引信在弹丸落地前根据落角信息计算出天线的主波束倾角,然后通过调整引信的工作频率使频扫天线主波束垂直照射到目标;仿真与实测结果显示:天线工作频率为30.2~35.6 GHz,在整个频带内增益均大于11 d B且幅值基本保持不变;天线通过频扫方式其E面主波束探测角可以达到78°;该天线高增益、小尺寸,天线的频扫特性使引信在不同落角情况下均能保持对目标的最大探测能力。

A frequency scanning microstrip antenna based on quasi-traveling wave array for millimeter wave fuzes was designed to solve the problem that traditional millimeter wave fuze antenna cannot take into account the wide beam,high gain and small size. This antenna consists of five space-fixed series microstrip patches with the size of 20 mm × 8 mm. The main beam direction was changed along with frequency scanning. According to the impact angels,the main beam of the frequency scanning antenna was irradiated vertically to the target by adjusting the fuze frequency. Simulated and measured results showed that the antenna had good performance between 30. 2 ～ 35. 6 GHz and the gain is greater than 11 d B; The antenna E plane can cover 78° by frequency scanning. With the high-gain and small-size frequency scanning antenna,the fuze can keep the best performance of target detection at different impact angles.