一种方形及矩形同轴线截止波长的实用计算公式

A practical formula to calculate the cutoff wavelength of square and rectangular coaxial lines

采用有限元数值算法计算出多种横截面尺寸下方形及矩形同轴线的截止波长,对所求数据分析表明,方形及矩形同轴线截止波长与其横截面周长存在一定线性比例关系,再通过Matlab数据拟合,求出比例系数,最终得到截止波长的近似计算公式。经检验表明,方形及矩形同轴线截止波长计算公式的误差分别在1%和5%以下,适合一般工程应用。

With the help of Finite Element Method, cutoff wavelength of square and rectangular coaxial lines has been calculated in many cases, and it shows that the cutoff wavelength is related to the circumference of the section. Then, according to the data firing of Matlab, the approximate formula of the cutoff wavelength is given. The error of this formula is less than 1% in square and 5% in rectangular respectively. So it＇s helpful in practical applications.