L波段宽带超低副瓣波导缝隙阵列天线设计

摘要

如何有效地提取缝隙参数、提高缝隙天线的设计精准度,是实现超低副瓣波导裂缝天线的关键.在对波导窄边裂缝阵列天线的频带宽度选择、阵中裂缝有源导纳的提取方法、缝隙电导函数的确定等关键技术进行分析的基础上,采用实测与理论分析相结合的方法提取缝隙参数,设计制作了一款L波段超低副瓣波导窄边裂缝阵列天线.近场测试结果表明,该天线有效工作带宽为200 MHz,频带内副瓣电平低至-42 dB,具有很强的抗干扰性能,且辐射效率高、水平波束窄,工程应用价值良好.%How to extract the gap parameters effectively and improve the design precision of the slot antenna is the key to realizing the ultra-low sidelobe waveguide slot antenna. Based on analyzing the selection of frequency bandwidth, the extraction method of active admittance of cracks in array and the determination of gap conductance function of the waveguide narrow-edge slot array antenna, a L-band waveguide narrow-edge slot antenna is designed via in combination of actual measurement with theoretical analysis for extracting the gap parameters. The near-field experimental results indicate that this proposed antenna, when in effective work width of 200 MHz and the maximize sidelobe of below -42dB, has strong anti-interference performance, high radiation efficiency, narrow horizontal beam,and thus is of fairly good application value.