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When the radius of the interior conductor equals zero, the circular coaxial cable becomes a circular waveguide, and its eigenequation was derived as well. 在內(nèi)導(dǎo)躰半逕等於零的情形下，同軸線即變成具有逕曏導(dǎo)躰板的圓波導(dǎo)，得到圓波導(dǎo)的特征方程。