翼片加载螺旋线慢波系统的特性测量与模拟
Measurements and simulations on dispersion and interaction impedance characteristics of vane-loaded helical SWS
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摘要: 使用Agilent8510C矢量网络分析仪测量了两种不同翼片加载螺旋线慢波系统在2~18 GHz频带内的色散和耦合阻抗。将被测系统等效为适当的微波网络，推导得到去除端口反射影响的慢波系统在微扰前后相位移变化的公式，应用该公式进行修正，可以有效抑制实验结果的波动。运用HFSS软件对实验中两个被测的螺旋线慢波结构进行建模，考虑了高次空间谐波对耦合阻抗的影响，结果表明，色散和耦合阻抗的模拟与实验值均有很好的一致性。Abstract: Dispersion and interaction impedance of two kinds of vane-loaded helical SWS were measured in 2～18 GHz with Agilent8510C Vector Network Analyzer. The measurement system was represented by proper microwave network and a formula to modify phase shift of SWS was derived that took reflection effects of transmission ports into account. Thus the fluctuation of experiment values were damped effectively. Dispersion and interaction impedance of them were also simulated by HFSS with space-harmonics effects included and ignored respectively. The experimental and theoretical values of dispersion and interaction impedance are found to be close in the band of 2～18 GHz.
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Key words:
- vane-loaded /
- helical slow-wave structure /
- interaction impedance /
- space-harmonics
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