A dielectric cover is usually needed in waveguide slot arrays for protection or thermal insulation purposes,and it can improve the antenna performance with a proper choice of the cover parameters.In light of this,the properties of a SIW longitudinal slot with a dielectric cover were extensively investigated using equivalent relationship between SIW and conventional waveguide together with Method of Moment,as a first step to the design of a SIW slot array and its integrated radome.The accuracy and efficiency of our method was assessed against Ansoft HFSS.The computational time was significantly reduced by a one-order magnitude with acceptable computational accuracy.Finally,effects of the dielectriccover were extensively investigated through three typical cover configurations and some instructional conclusions were drawn,which finds further application for the optimization design of the dielectric covers to improve the antenna performances.%在波导缝隙天线表面涂敷介质层可以起到保护、隔热的作用,而且合理设计介质层参数能够改善天线的性能.利用等效关系,将介质涂覆SIW缝隙模型等效为介质涂覆矩形波导缝隙模型,利用矩量法研究了缝隙的特性,并和商业仿真软件HFSS的结果进行了比较,本文方法在保持较高计算精度的同时,将计算时间减少了一个量级.在此基础上,以单层、两层和三层介质涂敷为例,分析了涂覆介质的介电常数和厚度对缝隙谐振长度和归一化谐振导纳的影响,为涂敷介质层的优化设计奠定了基础.
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