无线电工程

箭载中继用户终端对发射天线指向的扫描速率、波束覆盖范围均提出了很高的要求。相控阵天线的快速无惯性扫描能力适合上述应用要求。介绍了一副箭载宽角扫描圆极化相控阵天线的设计方法,设计并加工了一副天线样阵,设计中采用了圆极化微带单元、共形阵列结构和顺序旋转排列馈电。测试结果表明:天线可以实现方位±60°、俯仰±45°内的二维电扫描。在上述覆盖空域内,天线增益的变化为13.2¹7.2 d Bi,主波束轴比小于5.8 d B,半功率波束宽度为20°⁴0°。天线的各项指标满足中继发射天线的要求。

The rocket-borne relay terminal has high requirements on transmitting antenna in terms of scanning speed and beam coverage. Phased array is a suitable alternative for that application due to its rapid and inertia-free beam steering ability. The paper introduces a design of rocket-borne circularly-polarized phased array with wide scan range. In the design of the array,circularly-polarized microstrip patch is selected as the radiating element and a conformal structure is used. The sequential rotation feeding is also implemented. A prototype phased array is designed and fabricated following the procedure proposed. The test results show the antenna is able to cover ± 60° in azimuth and ± 45° in elevation. The antenna gain varies from 13. 2 d Bi to 17. 2 d Bi in the above scan range. The axial ratio in the main beam is better than 5. 8 d B and HPBW is 20°to 40°。The specifications of the prototype satisfy the requirements on the transmitting antenna of relay terminal.