宽带同轴pin二极管开关和限幅器是用低通滤波器结构实现的,低通滤波器内的并联电容是通过反向或零偏置pin二极管所呈现的电容组成的。通常设计仅考虑插入损耗情况,这种类型开关和限幅器的最佳隔离度的设计原则还没有文章介绍过,本文提出了用串联电感作为第一个元件所构成的滤波器可获得较高隔离度而不会增加插入损耗。 Broadband coaxial pin diode switches and limiters are implemented with a low-pass filter structure where the parallel capacitance in the low-pass filter consists of the capacitance presented by the reverse or zero-bias pin diode. In general, the design considers only the insertion loss, and the design principle of the optimal isolation between the switch and the limiter of this type has not been described yet. In this paper, a filter made of a series inductor as the first element is proposed to achieve a high Isolation without increasing insertion loss.