• 论文 •

### 非均匀间距的低副瓣宽带微带阵列天线设计

1. 火箭军工程大学 作战保障学院, 西安 710025
• 收稿日期:2020-06-28 发布日期:2021-10-09
• 通讯作者: 姚敏立 E-mail:yaominli66@163.com
• 基金资助:
国家自然科学基金（61601474）

### Design of low sidelobe broadband microstrip array antenna with non-uniform spacing

XU Tongmin, YAO Minli, ZHANG Fenggan, WANG Xujian

1. Combat Support Academy, Rocket Force University of Engineering, Xi'an 710025, China
• Received:2020-06-28 Published:2021-10-09
• Supported by:
National Natural Science Foundation of China (61601474)

Abstract: To reduce the Sidelobe Level (SLL) of the antenna and widen the bandwidth, a 16-element coupled-feed microstrip array antenna with non-uniform spacing at 14.25 GHz frequency was designed. The antenna adopts a multi-layer design, and a rectangular groove is formed in the ground layer to perform coupling feeding. And the air layer is introduced to reduce the antenna Q value and increase the bandwidth. Different from the excitation amplitude weighting of uniformly spaced antennas, this paper starts from the perspective of array element spacing, differential evolution algorithm is used to reduce the SLL, and a non-uniform spacing parallel linear array antenna is constructed. The energy received by the array element is approximately replaced with the energy passing through the rectangular slot, and the power distribution of the array element is observed. And the mathematical relationship of all feeder sections of the feed network is established to ensure that all array elements are excited with equal amplitude and in phase under the condition of unequal spacing. The measurement results show that the antenna has a voltage standing wave ratio of less than 2 in the range of 14 GHz to 15.2 GHz, which satisfies the bandwidth requirements of satcom on the move. The gain is more than 16 dB and the SLL is less than -17 dB within the operating bandwidth, which shows that the performance is better than that of the array antenna with uniform spacing.