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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。
In this paper, an improved design method of single-ridge waveguide crack array antenna is proposed. Firstly, the variation characteristics of isolated slot admittance with ridge parameters are analyzed, and the ridge waveguide parameters are reasonably selected. Then, the design parameters of the radiation front are first designed according to the ridge waveguide slot array design equation proposed by Elliott et al. Finally, According to the near field distribution of each slot, the offset and length of the slot are optimized to eliminate the influence of mutual coupling and edge diffraction on the sidelobe level of the antenna. In order to verify the effectiveness of the proposed method, an eight-element single-ridge waveguide slot antenna is designed. The simulation results show that the bandwidth of the antenna is about 9.5% (VSWR <1.5) and the sidelobe level is below -25dB. Better than the average.