一种介质加载型沟槽缝隙阵列天线 - 易迪拓培训.pdfVIP

一种介质加载型沟槽缝隙阵列天线 黄 成 赵泽宇 罗先刚 ( 中国科学院光电技术研究所，成都 610209) 摘 要：在阵列天线的设计中，阵元之间的距离通常设计在波长以内，以降低天线的栅瓣。本文提出了一种 新型介质加载的沟槽平板缝隙阵列天线。该阵列天线中的缝隙馈源之间的距离在 E 面大于 1 个波长，沟槽结 构加载在缝隙馈源之间以及两旁。我们分析了该天线的辐射性能，发现由于缝隙馈源中间沟槽结构的加载使 得天线的原有旁瓣电平大幅减小，实验结果测得其副瓣电平仅为-10.5dB；天线的增益也显著提高了约 6dB。 此外还讨论了加载沟槽结构后天线性能增强的物理机制。该沟槽结构可以被认为是一种二次辐射源，其能间 接地减小阵元之间的有效距离，从而改善天线的辐射性能。 关键词：栅瓣；沟槽；缝隙阵列天线；二次辐射源 A corrugated planar slots array antenna loaded with medium Cheng Huang Zeyu Zhao Xiangang Luo (State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences) Abstract: In the design of the array antenna, the distance between the elements is often required to be kept within the wavelength for reducing the grating-lobe level. In this letter, a novel dielectric loaded corrugated planar slots array antenna is presented, in which the distance in the E plane between the elements is set to be larger than the wavelength, grooves structure is distributed on the both sides of the slot elements in the E plane and dielectric is loaded on the interspaces between the neighboring grooves. The radiation performance of this array antenna is investigated. The measured results show that the introduction of the grooves structure makes its original high grating-lobe level sharply reduced and its side lobe level is measured to be only -10.5dB, and the gain is significantly increased by about 6dB. The physical mechanism for the antenna performance improvement is studied. It is found that the grooves structure in our antenna can be considered to be secondary radiation sources, therefore indirectly decrease the effective spacing between elements and finally ameliorate array antenna’s radiation performance. Keywords: