A measuring method and system was developed for microwave effective linewidth based on resonant-cavity perturbation theory. The measurement system consists of high-Q cylindrical resonant-cavity, programmable static magnetic field source and computer controlled vector network analyzer. ABA method was used to improve the test accuracy of resonant frequencyf and quality factorQ, and data processing and curve fitting were performed using MathCAD for high test accuracy of effective linewidth. The test result of high field effective linewidth for a 3mm in diameter and 1mm thick polycrystalline yttrium iron garnet(YIG) disk is 0.45Oe±0.25Oe,approximating the intrinsic linewidth of single crystal YIG.%基于腔微扰理论,提出了一种微波铁氧体铁磁共振有效线宽的测量方法和测量系统.系统主要包括高 Q 圆柱谐振腔、可编程电磁铁,计算机控制的矢量网络分析仪等.测试过程采用 ABA 方法提高谐振腔谐振频率f和Q的测量精度,采用MathCAD进行数据处理和曲线拟合,有效线宽测量结果具有较高精度.在9.8GHz时样品直径3mm、厚度1mm的多晶YIG圆片高场有效线宽为0.45±0.25Oe,接近单晶YIG的内禀线宽.
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