毫米波多通道接收组件隔离度对移相的影响

Influence of Isolation of Millimeter-wave Multi-channel Receiving Module on Phase Shift

介绍了多通道接收组件的典型原理框图,给出了通道隔离度、耦合度、移相精度和移相寄生调幅的概念,使用相量法推导了通道耦合度对移相精度和移相寄生调幅影响的计算公式,指出理论上隔离度对移相指标的影响与频率无关。利用软件仿真了通道隔离度对移相精度和移相寄生调幅的影响,得到了与公式计算相同的数值,两者互相得到了验证。提出了改善通道隔离度的方法,设计加工了一种Ka波段的四通道接收组件,改善了通道隔离度,具有较好的移相精度和移相寄生调幅指标。

This paper introduces the typical principle block diagram of multi-channel receiving module,puts forward the concept of channel isolation and coupling degree,phase shift precision and phase shift parasitic amplitude modulation（AM）,deduces the calculating formula of influence of channel coupling degree on phase shift precision and phase shift parasitic AM by means of vector method,indicates that the influence of isolation on phase shift indexes are irrelative with frequency theoretically.The influence of channel isolation on phase shift precision and phase shift parasitic AM are simulated by means of simulation software,the obtained values are same as the result obtained through formula calculation,they are validated by each other.The way to improve channel isolation is put forward,a Ka-band four-channel receiving module is designed and fabricated,the channel isolation is improved,better phase shift precision and phase shift parasitic AM are obtained in this paper.