磁共振系统中微型射频功率电桥的设计与测试

射频前端系统是影响核磁共振系统成像的关键部件之一。基于射频功率电桥的设计原理,在传统的FR4基板上采用集总工艺方法,实现微型化的射频功率电桥,仿真和测试结果显示,微尺度功率电桥的耐流、耐压性能优异,信号精度高,同时在核磁共振系统的工作频率下,小信号和大信号的输出损耗很小,完全符合核磁共振系统对大功率电桥的需求,整体的性能优异。

Design and Test of Miniature RF Power Bridge in Magnetic Resonance System

The RF front-end system is one of the key components affecting the imaging of the nuclear magnetic resonance system. Based on the design principle of the RF power bridge,the lumped parameter method is adopted on the traditional FR4 substrate to realize the miniaturized RF power bridge,and the simulation and test results are displayed. The micro-scale power bridge has excellent current and voltage resistance performance and high signal precision. At the working frequency of the nuclear magnetic resonance system,the output loss of small signals and large signals is small,which fully complies with the high-power bridge of the nuclear magnetic resonance system. The demand for overall performance is excellent.