微波技术作为独立的一门学科已经迅速发展起来，本文即从电磁场基础理论出发。给出了天然气管线这种特殊的圆波导截止波长的计算方法，对计算结果结合微波参数进行分析，得出集气管线对不同频率微波的截止条件，确定了不同管径的管线可以传输的微波频率。%Microwave technology is growing fast as a specialty discipline. Based on theory of electromagnetic field, the paper gave the method of calculation of the cutoff wavelength which the special circular waveguide-natural gas pipeline, tried to analyze the calculating result combine with parameter of microwave. Then, got a cutoff condition that the pipeline to different frequency of microwave, to make sure the frequency of microwave which the different pipe diameter can transmit.
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