摘要
本文提出了一种单脊波导裂缝阵天线的改进设计方法。首先分析了单脊波导上孤立缝隙导纳随脊参数的变化特性,据此合理选取脊波导参数;然后根据Elliott等提出的脊波导缝隙阵设计方程对辐射阵面的缝参数进行初步设计;最后根据各缝隙口面近场分布,优化缝隙的偏置和长度,以消除互耦、边缘绕射等因素对天线副瓣电平的影响。为了验证方法的有效性,设计了一个八元单脊波导裂缝阵天线,仿真结果表明天线驻波带宽约为9.5%(VSWR<1.5),副瓣电平在-25dB以下,与已有文献相比均有较大改善。
An improved design of single-ridge waveguide slot arrays is proposed in this paper.First the structural dimensions of single-ridge waveguide be determined by analyzing the influence of the ridge dimensions on the admittance of isolated slot in single-ridge waveguide;Then the entire array is preliminary designed with the Elliott's classical theory;In order to eliminate the influence of mutual coupling、edge diffraction and other factors on the sidelobe level,the offset and length of each slot are adjusted according to the near-field on slot aperture.To verify the effectiveness of this method,an eight-element single ridge waveguide slot arrays is designed.Simulation results show that the antenna VSWR bandwidth is about 9.5%(VSWR<1.5),and sidelobe less than-25dB,so the performance has been greatly improved as compared with existing literatures.
出处
《微波学报》
CSCD
北大核心
2010年第S1期224-227,共4页
Journal of Microwaves
关键词
单脊波导
宽频带
导纳
副瓣
single-ridge waveguide
broadband
admittance
sidelobe
