针对传统超宽带射频前端组合杂波干扰过多和体积过大的问题,提出了将射频前端通过采用毫米波二次变频的设计方案,使得输入中频和输出射频之间的频率间隔加大,削弱了混频导致的频率组合、杂散和本振反向辐射等干扰。通过对器件功率及电平的合理配置,实现了低噪声、宽频带、大动态的输出,在大于4 GHz的接收频段内,其噪声系数小于3.6 dB,动态范围大于55 dBm。该接收前端还具备低成本、结构紧凑、重量轻等特点,可广泛应用于电子对抗、宽带侦察接收系统。%To solve the problem of the combined frequency interference and large size in conventional wide-band receiver front-end,a millimeter wave double conversion scheme is proposed in this paper,which ex-pands the interval between input intermediate frequency and output radio frequency so as to weaken the combination frequency interference,output spur and back radiation of local oscillator decrease. By configu-ring power and supply voltage of device properly,low noise,wideband and large dynamic range at output is realized with noise figure≤3. 6 dB and dynamic level≥55 dBm in bandwidth>4 GHz. The designed front-end is featured by low cost,compact structure and light weight and it can be widely applied in electronic countermeasure,wideband reconnaissance system and other fields.
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