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普通对数周期天线的宽带原理仅仅建立在阵元结构的对数周期牢特性上;而未注意阵元自身的宽带特性。本文介绍的是以三角形阵元代替传统线振子的对数周期天线。由於阵元等效直径加大,呈现出优良的宽带性能,使得全频段内天馈系统均能良好匹配。更为有益的是,这种天线的结构改善了天线的电流分布,与具有相同阵元数目的普通对数周期天线相比,天线增益明显提高。本文在一般定性分析的基础上,引入矩量法对天线的电流分布、方向图和增益进行了定量的分析。最后给出了此种天线主要性能参数的理论计算与实验测试结果。
Broadband principle of ordinary logarithmic periodic antennas is only based on the logarithmic periodic jitter characteristics of the array element structure; it does not pay attention to the broadband characteristics of the element itself. This article describes a logarithmic period antenna that uses triangular elements instead of traditional line elements. As the equivalent diameter of the array increases, showing excellent broadband performance, making the full range of antenna feeding system can be a good match. Advantageously, the antenna configuration improves the current distribution of the antenna, with significantly improved antenna gain compared to an ordinary logarithmic periodic antenna with the same number of elements. Based on the general qualitative analysis, this paper introduces the method of moment for the quantitative analysis of antenna current distribution, pattern and gain. Finally, the theoretical calculation and experimental test results of the main performance parameters of this antenna are given.