等效电路法计算耦合腔慢波结构特性  

Simulation of Coupled-Cavity Slow-Wave Structures with Modified Equivalent Circuit

作　　者：杨军[1,2] 吕国强[1,2] 邓光晟[1,2] 黎泽伦[3] 胡跃辉[1,2] 谢松廷[3] 

机构地区：[1]特种显示技术教育部重点实验室,合肥230009 [2]合肥工业大学光电技术研究院,合肥230009 [3]合肥工业大学仪器科学与光电工程学院,合肥230009

出　　处：《真空科学与技术学报》2008年第6期526-530,共5页Chinese Journal of Vacuum Science and Technology

摘　　要：耦合腔慢波结构的等效电路模型是实际情况的一种近似,冷测计算结果存在一定误差,特别是在整个冷测带宽内精度不能保持一致。为提高计算精度,通过对等效电路参数的分析,引入参数对间隙电容和耦合槽谐振频率计算公式进行了修正。利用修正的模型模拟了10 GHz^16 GHz的单槽和双槽耦合腔慢波结构,分析了修正参数对计算精度的影响,提出了不同修正方案来提高整个冷测带宽内计算精度,与电磁场数值计算结果最大相对误差为1.6%。计算结果表明修正参数可以将工程经验引入设计开发中,有效地提高等效电路模拟精度,对实际工程设计具有指导意义。The existing equivalent circuit model of the coupled-cavity slow-wave structures, over the whole band from 10GHz-16GHz, has been successfully modified to improve the accuracy of the characteristics calculation. Some empirical data, accumulated in long time practice, were fully considered in modifying the equivalent circuit to bypass the structural complexity of the devices. The formulas of the gap capacitance and the slot resonant frequency are modified with two correction parameters, respectively. Two types of the coupled-cavity structure （single slot and double slots） were simulated with the modified equivalent circuit. Various possible correction schemes were tested to improve the simulation accuracy of the cold-test characteristics. The difference between the simulated results and those obtained by numerical calculation of the electromagnetic field with traveling wave tube （TWT） CAD software package is found to be less than 1.6% .We suggest that the empirical data may offer some guidance in designing of the new devices.

关 键 词：行波管 耦合腔 慢波结构 冷测特性 等效电路 

分 类 号：TN124[电子电信—物理电子学]