天线方向性系数和增益 （ directivity and gain of antenna ） 表示天线集中辐射程度的一个参量。以向各方向均匀辐射的理想点源（均匀辐射器）作为比较基准，天线方向性.
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The simple formulae of fast calculating aperture antenna directivity and gain are derived using antenna beamwidths. Applied range of these formulae are analyzed and discussed.
导出了用天线方向图的半功率波束宽度快速计算口径天线方向性系数和增益的简单表达式，分析讨论了这些公式的应用范围。
The detailed measurements of the antenna, including VSWR, directivity and gain are processed. The measurement results are compared with the electromagnetic simulation results and analyzed.
通过对天线进行了驻波比、方向图、增益的详细测量并和软件仿真结果进行了比对和深入的分析。
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