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本文叙述了准毫米波段卫星通信系统2OGHz 双调谐参量放大器的理论和设计方法。为了在综合考虑的基础上正确计算双调谐参放平坦带宽,采用了新的频带特性表示法。这种表示法的特点是:以放大器呈现负阻不为零的带宽为基准,在信号和空闲回路中引入用二极管自身的斜率参量归一化的斜参。在此基础上综合分析了影响参放最大平坦带宽潜力的因素,指出了准毫米波段极宽频带参放的设计方法。最后在新设计理论的基础上,对双调谐信号回路,采用具有理想特性,且在准毫米波段容易实现的插入式结构,空闲回路采用交叉波导结构进行了实际设计,同时提供出了新型二极管结构形状及特性,给出了20GHz 参放性能:10db 增益平坦带宽大于2.4GHz;噪声温度约400K。
This paper describes the theory and design method of 2OGHz dual tuned parametric amplifier in quasi-millimeter band satellite communication system. In order to correctly calculate the double tuned parameters on the basis of comprehensive consideration flat bandwidth, a new representation of the characteristics of the band. The notation is characterized by the introduction of a slope factor normalized to the slope of the diode itself in the signal and in the free path, based on the bandwidth at which the amplifier presents a non-zero negative resistance. On this basis, the factors that affect the potential of the maximum flat bandwidth of the PEMS are synthetically analyzed, and the design method for the PFCAM of the extremely wideband is proposed. Finally, on the basis of the new design theory, the double tuned signal loop is designed with a plug-in structure with ideal characteristics and easy to realize in the quasi-millimeter wave band. The free loop is actually designed with a cross-waveguide structure and a novel diode structure Shape and characteristics, given 20GHz parametric performance: 10db gain flat bandwidth greater than 2.4GHz; noise temperature of about 400K.