螺旋带行波管耦合磁导纳的计算
Interaction admittance of a thin tape helix surrounded by a dielectric
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摘要: 通过对螺旋带行波管带上表面电流的Chebyshev展开，得出了色散关系，求出了电场分量和磁场分量的表达式，进而求得了耦合阻抗和耦合磁导纳。计算并分析了一个典型结构的纵向电磁场分量，由这些分量得出的耦合阻抗与Chernin等的结果有很好的一致性,说明了电场表达式的有效性。场表达式可应用于３维行波管CAD的程序编写，耦合磁导纳的计算程序更是行波管CAD不可缺少的部分。Abstract: An exact dispersion has been obtained and components of the electromagnetic fields have been evaluated by expanding the surface currents on a thin tape of a traveling wave tube(TWT) in a series of Chebyshev polynomials. And based on the axial components of the fields the interaction impedance and magnetic admittance are calculated. These are foundation of 3-D nonlinear theory to design TWT. An example is given and axial components of the electromagnetic fields are computed. It is found that the result of interaction impedance according to the fields and the one obtained by Chernin agree to good accuracy, which validates the expressions of the fields. The interaction admittance calculation is a part of the 3-D TWT CAD．
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Key words:
- high power microwave /
- twt /
- tape helix /
- electromagnetic field /
- interaction impedance /
- interaction admittance
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