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本文阐述了间隙处有填充物物的凹形腔理论,归纳了它的特点。同时给出了宽带参放频带特性表示式。在此基础上,结合高频段参放的特殊矛盾,对该频段参放提出了具体设计要求,并讨论了凹形腔用作高频段参放空闲回路的优越性。最后根据上述思想进行了11GHz参放设计实践。其实验结果为单级增益10分贝,1分贝带宽大于800兆赫,三级级联等效输入噪声温度小于210K(包括0.5分贝环行器损耗贡献在内)。每级的泵动耗约20毫瓦。实测的噪声数据与理论值甚相吻合。
In this paper, the theory of concave cavity with filling material in the gap is expounded, and its characteristics are summarized. At the same time, it gives the expression of broadband parametric band characteristics. On this basis, combined with the special contradictions in the high frequency band, puts forward the specific design requirements for the band gamut and discusses the superiority of the concave cavity as the free circuit in the high frequency band. Finally, based on the above ideas 11GHz parametric design practice. The experimental results for the single-stage gain of 10 dB, 1 dB bandwidth greater than 800 MHz, three cascade equivalent input noise temperature is less than 210K (including the contribution of 0.5 dB circulator losses included). Each stage of the pump consumes about 20 milliwatts. The measured noise data is in good agreement with the theoretical value.