环形器在少子寿命测试仪中的应用研究

Research on Circulator Application in Carrier Lifetime Tester

针对少子寿命测试仪中存在的信号较弱导致的测试结果重复性较低的问题,先对矩形波导中微波的传输特性进行了理论分析。然后对测试仪中关键传输耦合模块魔T进行了研究。研究发现微波在魔T中的传播导致了大量能量的损失,严重削减了信噪比。环流器的特性很好地弥补了魔T的不足,既保证了微波正常的传输耦合又提高了装置中微波的能量利用率,保证了信噪比。用环流器替代魔T并进行改进后,测试结果重复性由原来的7%提升至3%

Minority carrier lifetime tester has a poor repeatability caused by low signal-noise ratio.In order to solve the problem,this paper analyzed the transmission features of microwave in the rectangle wavegnide.Then magic tee was analyzed roundly due to its essential function in the transmission and coupling of microwave.It comes out that a large amount of microwave energy was wasted during the transmission in the magic tee,which directly and largely slashes signal- noise ratio.Circulator can cover magic tee＇s shortcomings.It can transfer and couple microwave,at the same time,it has a tiny energy loss,which leads to a better signal-noise ratio.The repeatability rises from 7% to 3% after the improvement by changing magic tee with circulator.