基于HFSS密度测量同轴谐振腔磁耦合环优化设计

Optimal design for electromagnetic coupling ring of coaxial resonant cavity used for density measurement based on HFSS

基于同轴谐振腔密度测量原理建立了应用于密度测量的同轴谐振腔传感器模型,采用HFSS仿真软件对具有不同磁耦合环结构尺寸的同轴谐振腔进行仿真,通过比较磁耦合环S21曲线得出的优化参数为,耦合环起始点到腔体轴心距离L=24 mm,耦合环半径R=2 mm,耦合环角度θ=260°,同轴谐振腔在该参数下具有较优越的电磁特性,且分辨力较强.同时,以粉末硅为该同轴谐振腔的加载物料,采用得出的优化同轴谐振腔模型进行HFSS仿真.仿真结果表明,加载物料之后,同轴谐振腔S21曲线的谐振特性明显改变,其谐振频率f变化显著,而且,其变化幅度可以在HFSS得出的S21仿真曲线上得出,通过检测这种变化就可以利用经验公式推求出加载物料的密度.

This paper sets a model of coaxial resonant cavity used for density measurement based on the density measurement principle using coaxial resonant cavity.The emulation of different configuration coaxial resonant cavity adopt HFSS software educe S21 curve.The optimal parameter according to comparing the different S21 curve is L=24 mm,R=2 mm and θ=260°.The coaxial resonant cavity has better electromagnetism characters and differentiate ability.Using dust silicon as the loading materiel did emulation for the optimal coaxial resonant cavity model.The emulation results indicate that the syntonic character of the S21 curve changed obviously after setting material into the coaxial resonant cavity and the resonant frequency also changed dramatically.The change extent can be received in the S21 curve.To measure this variety can ascertain the density of the setting material by using the experience formula.