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针对现代毫米波接收机和雷达系统高抗干扰能力的需求,分析了具有镜像频率抑制能力的谐波混频器的基本原理,提出了一种Ka波段镜像抑制谐波混频器的设计方案。该混频器由两个混频单元组成,利用输出信号的相位关系识别RF信号和镜频信号,RF混频信号在输出端口同相叠加,镜频混频信号反相抵消。使用Ansoft HFSS和Agilent ADS仿真软件分别完成电路无源部分仿真和谐波平衡仿真设计,制作了混频器并进行了测试。测试结果表明:RF频率为29.4～31GHz,中频(IF)为100 MHz,变频损耗稳定在8.8～10.3 dB,镜像抑制度大于20.1 dB,各个端口隔离度均大于31.4 dB,RF端口和本振(LO)端口驻波比分别小于1.3和2.2,输入功率在1 dB压缩点为-5 dBm。
Aiming at the demand of high antijamming ability of modern millimeter-wave receiver and radar system, the basic principle of harmonic mixer with image frequency rejection capability is analyzed and a design scheme of Ka-band image rejection harmonic mixer is proposed. The mixer consists of two mixing units, which uses the phase relationship of the output signal to identify the RF signal and the image signal. The RF signal is superimposed in the same way on the output port, and the signal is negated in the opposite direction. Ansoft HFSS and Agilent ADS simulation software were used to complete the circuit passive part simulation and harmonic balance simulation design, the mixer was made and tested. The test results show that the RF frequency is 29.4 ~ 31GHz, the IF is 100MHz, the conversion loss is stable at 8.8 ~ 10.3dB, the image rejection is more than 20.1dB, the port isolation is more than 31.4dB, and the RF port and local oscillator LO) port VSWR of less than 1.3 and 2.2, respectively, and input power of -5 dBm at 1 dB compression.