Abstract—Numerical calculations of the matching of a resonant radio absorber (RA) have confirmed that the ideal matching of such an RA with free space can be realized using practically any dielectrics with losses at any desired frequency. The conditions are considered that provide the widest matching band of the RA, and it is shown that the ratio of the bandwidth to the RA thickness (bandwidth to thickness ratio) is about 3.7, i.e., more than for the usual single-layer Dallenbach RA (about 3.2).

中文翻译：

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具有自由空间的共振无线电吸收器的频率控制

摘要—共振无线电吸收器（RA）匹配的数值计算已经证实，这种RA与自由空间的理想匹配几乎可以通过使用任何在任何所需频率下具有损耗的电介质来实现。认为条件提供了RA的最宽匹配带，并且表明带宽与RA厚度的比率（带宽与厚度之比）约为3.7，即，比通常的单层Dallenbach RA更大（约3.2）。