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镜频抑制混频器能有效地抑制镜像频率,提高雷达和通信系统的抗干扰能力。介绍了一个20 GHz二次谐波镜频抑制混频器的设计与制作,该镜频抑制混频器采用两个相同的二次谐波混频器做为两路混频单元,两路射频输入和中频输出分别用90°的功分器/合路器与两路混频器相连,本征用威尔金森功分器等幅同相输入两路混频。借助于90°的功分器,两路混频器的镜频产物在中频90°合路器的输出端口反相抵消,有用中频在90°合路器的输出端口同相叠加。利用ADS和HFSS对该混频器进行了仿真设计,并对实际电路进行了加工测试。经测试,当中频固定在400 MHz时,射频在20～21 GHz内变频损耗小于10 dB,镜频抑制大于20 dB。
The image rejection mixer can effectively restrain the image frequency and improve the anti-interference ability of radar and communication system. This paper introduces the design and fabrication of a 20 GHz second harmonic suppression frequency mixer with two identical second harmonic mixers as two mixing units and two RF The input and IF output are respectively connected to the two-way mixer by means of a 90 ° splitter / combiner. The intrinsic Wilkinson power splitter equals two phases of the same phase input. With the help of the 90 ° power splitter, the two frequency mixer’s video frequency products cancel each other in the output port of the intermediate frequency 90 ° combiner, and the useful intermediate frequency is superimposed on the output port of the 90 ° combiner in the same phase. The mixer was simulated by ADS and HFSS, and the actual circuit was tested. Tested, when the IF fixed at 400 MHz, the RF frequency loss in 20 ~ 21 GHz less than 10 dB, the image rejection greater than 20 dB.