一种幅相一致性高可靠LC滤波器设计

针对批量生产的相控阵雷达发射-接收(T/R)组件对滤波器的幅相一致性要求较高的问题,该文分析了影响LC滤波器幅相一致性的因素,并从产品的电路原理和结构方面对与产品可靠性有关的元器件、工艺流程等因素进行了分析,设计了一款3 GHz带外抑制大于60 dB、多只间相位一致性≤5°、多只间幅度一致性≤0.2 dB的滤波器。结果表明,该滤波器具有较好的矩形系数、带外抑制和高幅相一致性,产品用于某高可靠星载系统T/R组件中,实现了批量生产对幅相一致性的要求。

Design of an LC Filter with High Reliability and High Amplitude Phase Consistency

In view of the fact that the mass produced transmitter receiver(T/R) modules for phased array radar require high amplitude phase consistency of filter, the factors influencing the amplitude phase consistency of LC filter is analyzed in this paper, and the components and process flow related to the product reliability is investigated from the aspects of circuit principle and structure. A filter with the out of band rejection of greater than 60 dB at 3 GHz, phase consistency among filters of less than or equal to 5°, amplitude consistency among filters of less than or equal to 0.2 dB is designed. The results show that the filter has good shape factor, good out of band rejection and high amplitude phase consistency. The filter has been used for the T/R module of a high reliable satellite borne system to meet the requirements of amplitude phase consistency in mass production.