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以毫米波成像应用为背景,研制了一种用于Ka波段主动成像系统的宽带收发前端。采用结构紧凑的自差式结构,降低系统成本并使其具有较高的可靠性;分析影响成像系统的动态范围和分辨率的因素,选择并设计宽频带毫米波源、低插损带通滤波器和平面缝隙天线等关键电路,使前端具有足够的输出功率和良好的杂散抑制,在31～36GHz的频带内,收发前端的输出功率大于10.4dBm,杂散抑制大于25dBc。对金属目标的成像实验结果表明,前端的方位向和距离向的分辨能力小于8cm,初步满足了主动成像的要求。
Based on the millimeter wave imaging application, a wideband transceiver front end for Ka-band active imaging system was developed. Using a compact self-destruct structure, reducing system cost and making it more reliable; analyzing the factors affecting the dynamic range and resolution of the imaging system, selecting and designing broadband millimeter wave sources, low insertion loss bandpass filters And plane slot antenna and other key circuits, so that the front end has sufficient output power and good spurious suppression in the 31 ~ 36GHz band, the front-end output power of more than 10.4dBm, spurious suppression greater than 25dBc. The imaging experiments on the metal target show that the azimuth and distance resolution of the front end is less than 8 cm, which initially meets the requirements of active imaging.