由正六边形复合空馈子阵组成的高增益宽频带印刷天线阵.pdfVIP

由正六边形复合空馈子阵组成的高增益宽频带印刷天线阵 贺 祥 章文勋 吴知航 ( 东南大学毫米波国家重点实验室，南京 210096)1 摘 要：本文设计了一个高增益宽频带的印刷复合空馈阵天线及其馈电网络。该阵列天线由七个正六边形的 复合空馈子阵按蜂窝状组成。通过以获取各主要性能之公共宽频带为准则的优选，确定了中间单元与周边六 单元的馈电幅度的最佳比值为 0.42 ，并据此设计了馈电网络。经整体的全波仿真和样品的实验测试，得到 （仿 真/ 实测）结果：最高增益为22.87 / 22.51 dBi；电压驻波比≤ 2.0 : 1 、增益跌落≤−3 dB、以及副瓣电平≤− 15 dB 的公共频带达 9.63 / 8.28 %。 关键词：印刷天线，复合空馈阵，宽频带天线，Fabry-Perot 谐振器 A High-Gain Broadband Printed Antenna Array Consisting of Hexagonal Compound Air-Fed Sub-Arrays He Xiang1 Zhang Wenxun1 Wu Zhihang1 1 (State Key Lab of Millimeter Waves Southeast University, Nanjing, 210096) Abstract: A high-gain and broadband printed compound air-fed array (CAFA) antenna together with its feed network is developed, which consists of seven hexagonal CAFA as sub-arrays or cells, arranged in a honeycomb structure. The feeding-voltage ratio of the central cell to the circumjacent cells is optimized as 0.42, based on the criterion of common broadband for main performances, then the feed network is designed. The whole simulated /measured results of a prototype are of peak gain 22.87 / 22.51(dBi) and of common bandwidth (for VSWR ≤2.0:1 gain-drop ≤−3 dB SLL ≤− 15 dB) 9.63 / 8.28 (%). Keywords: printed antenna, compound air-fed array, broadband antenna, Fabry-Perot resonator. 提高最高增益的方法，但由于增益和带宽之间固有 1 引言 的矛盾，当峰值增益提高约5 dB 时，其公共频带变 窄到不足 2%. 本文采用先设计 CAFA 作为子阵单 作为印刷天线家族新成员的复合空馈阵(CAFA) 元，再由若干子阵组合成大型阵列天线的方案，在 天线[1]，将设计反射阵和传输阵时的相位补偿概念注 保有较宽频带的同时提高了增益。结构上采用正六 入 Fabry-Perot 天线[2]的设计中：通过在盖板和基