微波铁氧体铁磁共振有效线宽扫频测量可调谐振腔设计

讨论了一种用于微波铁氧体铁磁共振有效线宽扫频测量的可调谐振腔,即TE011模式的圆柱谐振腔,通过手动或电动方式改变腔体大小,可实现谐振频率连续调节。介绍了其详细设计方法,给出了腔体直径和长度的计算方法。提出了多个腔体分段覆盖的方法,解决了单腔体结构导致的调谐精度差和Q值较低的问题。制作了样品进行验证,该样品采用两个谐振腔覆盖8~12GHz的调谐范围,第一个腔体直径52mm,调谐长度40~21.5mm,调谐频率范围为7.9~9.9GHz,第二个腔体直径42mm,调谐长度为33.4~17.8mm,调谐频率范围为9.8GHz~12.1GHz。测试结果表明调谐频率符合理论计算结果,Q值满足设计要求。

Design of tunable resonant cavity for sweep-frequency measurement of effective resonance line-width of micromave ferrite

A tunable resonant cavity has been developed for microwave effective linewidth sweep-frequency measurement technique. The cylindrical cavity was operated in TE011 mode, by way of manual or electric changing the cavity size to continuously tune the resonant frequency. The detailed design method was presented, and the calculating metood was given for the diameter and length of the cavity. Multiple cavity section covering method was proposed, to solve the problem that deterioration in tuning accuracy and lowQ value resulting from single cavity structure. A sample has been made with two cavities covers a tuning range of 8 to 12 GHz, the first cavity has a diameter of 52mm, tuning length of 40mm to 21.5mm, tuning frequency range of 7.9GHz to 9.9GHz, the second cavity has a diameter of 42mm, tuning length of 33.4mm to 17.8mm, and tuning frequency range of 9.8 GHz to 12.1GHz.The results show that the tuning frequency is consistent with theoretical results, andQ value meets the design requirements.