中文摘要：

盘荷波导慢波结构可以看成由无数多个波导不连续性组成，每个波导不连续性可用一个T型网络描述，其参数能用变分方法得到，再根据无耗的四端微波网络理论，可以得到这种慢波结构的色散方程，因此本文得到了一种用于计算盘荷波导慢波结构色散特性的变分法。该变分法获得的色散特性结果与用场匹配法和HFSS模拟获得的结果符合得比较好。

英文摘要：

Disk-loaded slow-wave waveguide structures are composed of many waveguide discontinuities. The waveguide discontinuity can be described by a symmetrical T network, whose parameters are calculated by variational methods. Then the dispersion equation of the slow-wave structure can be obtained using lossless microwave quadruple theory. Good agreement is observed between results of the variational method and those of field matching method and high-frequency structure simulator.