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扁波导馈电的平板缝隙天线阵,除了馈电波导内部耦合增强以外,带宽也受到限制。文章从谱域角度分析了缝隙天线的内外场分布,在此基础上,得到了周期波导和金属波导中各模式场的功率/储能谱。计算了波导缝隙天线的Q值并分析其变化规律,解释了扁波导馈电带宽受限的原因是辐射波导内的驻波储能场增强造成的。提出了在缝隙两侧增加扼流槽的改进方案,并同样从谱域的角度分析了该方案对带宽改善的影响。将该方案应用于一个实际的SIW平板波导缝隙天线阵设计中,获得了8.1%的带宽。
Flat-wave guide fed flat slot antenna array, in addition to enhanced internal coupling waveguide, the bandwidth is also limited. In this paper, the distribution of the internal and external fields of the slot antenna is analyzed from the perspective of spectral domain. On the basis of this, the power / energy storage spectra of each mode field in periodic waveguide and metal waveguide are obtained. The Q value of the waveguide slot antenna is calculated and its variation is analyzed. The reason why the bandwidth of the waveguide is limited is explained by the increase of the stored energy field of the standing wave in the waveguide. An improved scheme of adding choke slots on both sides of the slot is proposed. The effect of this scheme on bandwidth improvement is also analyzed from the perspective of spectrum. The scheme was applied to a practical SIW slab waveguide slot antenna array design with 8.1% bandwidth.