一款大功率带阻滤波器的设计仿真与实现

Simulation and implementation of high-power band-stop filter

为了准确测试杂散小信号,在射频输入信号进入频谱仪之前采用带阻滤波器滤除基波大信号,保证进入频谱仪混频器端口的功率电平符合要求。设计了一款可过大功率的短波带阻滤波器,该滤波器不但可有效滤除基波大信号,避免频谱仪的饱和非线性失真,且带外平坦,对需要测量的杂散信号几乎无损耗。仿真结果证明了该设计方案的可行性。

In order to test the small spurious signals accurately, the large signals of the fundamental wave are filtered through band-stop filter before RF input signals entering the spectrum analyzer, which ensures the power level of mixer port meets the standard. A short-wave band-stop filter allowing high power to pass is designed in this paper. The filter not only filters the large signals of the fundamental wave to avoid saturation nonlinearity distortion, but also realizes flatness out of band, which makes spurious signals to be measured non-loss. The simulation results prove the feasibility of the design scheme.