基于连续横向枝节的单脉冲阵列天线

Monopulse Array Antenna Based on Continuous Transverse Stub

摘要:

针对W波段天线加工难度大，尺寸容错率低等局限性，提出了一种基于连续横向枝节（continuous transverse stub，CTS）的单脉冲阵列天线。该天线采用全金属结构，包含12个CTS单元，并采用缝隙耦合的串馈方式的和差器作为馈电网络。仿真与实测数据表明：该天线在8%的相对带宽内，驻波比小于2；最大增益达26.9 dBi，呈现出优异的窄波束特性；H面方向图副瓣电平低于-25 dB, E面方向图副瓣电平低于-13 dB，且天线零深低于-22 dB。仿真和测试结果具有良好的一致性。该天线还具有低损耗、易加工、尺寸容错率高等优势，可应用于卫星导航及雷达探测领域。

Abstract:

To address the challenges of high fabrication difficulty and limited dimensional tolerance in W-band antenna，a monopulse array antenna based on continuous transverse stub (CTS) was proposed. The antenna featured an all-metal structure comprising 12 CTS elements, with a slot-coupled series-fed network serving as the sum-and-difference beamforming feed. Simulation and measurement results demonstrate that the antenna achieves a voltage standing wave ratio （VSWR） of less than 2 over an 8% fractional bandwidth, with a peak gain of 26.9 dBi, exhibiting excellent narrow-beam characteristics. The H-plane sidelobe level （SLL）is below -25 dB, while the E-plane SLL is below -13 dB, and the null depth is better than -22 dB. The antenna features low loss, ease of fabrication, and high dimensional tolerance, making it suitable for satellite navigation and radar detection applications.