基于时域有限差分方法设计调幅射频辐照头部线圈

The Design of Amplitude-modulated Radiofrequency Exposure Head Coil Based on Finite Difference Time Domain Method

研究应用于调幅射频电磁场生物效应研究的非接触式射频线圈。首先根据射频辐照线圈的设计要求,通过时域有限差分(finite difference time domain,FDTD)方法进行电磁仿真计算分析;进而根据仿真计算结果实现辐照原型射频线圈。S参数测试和信号测试结果显示,S_(11)参数达到了-31.41 d B,且射频线圈共振在载波频率上,所实现的射频线圈符合设计要求。该射频线圈可作为核心硬件部件应用于后续的调幅射频电磁场生物效应研究中。

A non-contact RF coil was designed for the biological effects research of amplitude-modulated radio-frequency electromagnetic fields. First, the FDTDmethod was used to obtain the electromagnetic simulation results according to the demand of design for RF exposure coil. Then the prototype of tlie coil was built baseof the simulation. The results of Y parameter and signal test showed that Sn parameter reached to -31.41 dB andthe coil resonated at tlie carrier frequency, reached the requirement. This RF coil can be used as the core hardware component in the subsequent biological effect research of amplitude-modulated radiofrequency electromagnetic fields.