具有最佳边缘照明的半椭圆介质透镜天线的性能
Performance of hemielliptic dielectric lens antennas with optimal edge illumination
摘要：
采用基于Muller边界积分方程和解析正则化方法相结合的高效算法，精确研究了边缘照明对小型介质透镜天线（DLAs）性能的影响.该分析考虑了透镜的有限尺寸和靠近透镜底座中心放置的主馈电的定向性质。这个问题是解决在一个二维的配方为E和H-偏振。结果发现，远离内共振破坏了由致密材料制成的DLA的辐射特性，边缘照明具有首要的重要性。该参数的适当选择有助于最大化DLA方向性，其最佳值取决于透镜材料和馈送偏振。索引条款：波束准直，介质透镜天线，方向性改善，边缘照明，边缘锥度，半椭圆透镜。
英文摘要：
The role of edge illumination in the performance of compact-size dielectric lens antennas (DLAs) is studied in accurate manner using a highly efficient algorithm based on the combination of the Muller boundary integral equations and the method of analytical regularization. The analysis accounts for the finite size of the lens and directive nature of the primary feed placed close to the center of the lens base. The problem is solved in a two-dimensional formulation for both E- and H-polarizations. It is found that away from internal resonances that spoil the radiation characteristics of DLAs made of dense materials, the edge illumination has primary importance. The proper choice of this parameter helps maximize DLA directivity, and its optimal value depends on the lens material and feed polarization. Index Terms: Beam collimation, dielectric lens antenna, directivity improvement, edge illumination, edge taper, hemielliptic lens.
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