一、前言在超外差接收系统中,当以混频器作为输入级时,尽可能地降低混频器的变频损耗或噪声系数及展宽电路的工作带宽是电路设计的主要目标。且在大多数应用中前者更为重要。为实现这一目标采用微波混合集成宽带镜能回收混频器电路最为有效。实践证明,实现镜能回收,相位设计方案较滤波器方案有更多的优点,如不需调谐能有较宽的工作带宽,电路最佳尺寸易于控制,调整方便等,因此获得了广泛地应用。 I. INTRODUCTION In superheterodyne receiving systems, when the mixer is used as the input stage, it is the primary goal of the circuit design to reduce the frequency conversion loss or noise figure of the mixer and broaden the working bandwidth of the circuit as much as possible. And in most applications the former is more important. To achieve this goal, it is most effective to use microwave hybrid integrated broadband mirror to recover the mixer circuit. Practice has proved that the mirror to achieve recovery, the phase design than the filter program has more advantages, such as no tuning can have a wider working bandwidth, the optimal size of the circuit easy to control, easy to adjust, it has been widely used .