摘要
针对核磁射频系统对低频大功率环行器的高稳定性应用需求,通过对器件热特性进行分析,提出了快速补偿结构和高散热通道设计,并结合HFSS电磁场仿真软件和ANSYS热力学软件进行建模仿真和设计优化,成功开发了一款160 mm×150 mm×35.2 mm的大功率环行器。测试结果表明,在工作频带内回波损耗>18 dB,插入损耗<0.3 dB,隔离度>18 dB,可在20 kW峰值功率下长时间稳定工作,功率下失配相移稳定性<8°,很好地满足了核磁射频系统带反射功率工作能力的需求。
In order to meet the requirement of high stability of low frequency high power circulator in nuclear magnetic radio(NMR)frequency system,a fast compensation structure and high heat dissipation channel design are proposed by analyzing the thermal characteristics of the device.A model was established for simulation and design optimization using HFSS and ANSYS,and a high power circulator with 160 mm×150 mm×35.2 mm is successfully developed.The test results show that in the working frequency band,return loss>18 dB,insertion loss<0.3 dB,isolation>18 dB,it can work stably under the peak power of 20 kW for a long time,and the stability of mismatch phase shift under power is less than 8°,which well meets the requirement of nuclear magnetic radio frequency system with reflected power.
作者
杨勤
张远
韩晓川
鲁宗志
刘福涵
YANG Qin;ZHANG Yuan;HAN Xiao Chuan;LU Zong Zhi;LIU Fu Han(Southwest Institute of Applied Magnetics,Mianyang 621000,China)
出处
《磁性材料及器件》
2025年第2期46-50,共5页
Journal of Magnetic Materials and Devices
关键词
环行器
高功率
相移稳定性
温度补偿
circulator
high power
phase shift stability
temperature compensation
