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噪声在级联二端口有耗网络中传输时,每一级网络除了损耗前一级传输过来的噪声功率外,还要给出网络本身的噪声。只有确定了网络中损耗和发生的噪声,才能准确地进行噪声测量。 本文利用资用功率传输系数概念来分析网络中噪声的损耗和发生,推导出级联二端口有耗网络中噪声传输的计算式。该计算式已被用于确定热噪声标准源的资用噪声温度。
When noise is transmitted in a consumable network with cascaded two ports, each level of the network not only consumes the noise power transmitted from the previous stage, but also gives the noise of the network itself. Only by determining the network loss and noise occurs, can accurately measure the noise. In this paper, the concept of power transmission coefficient is used to analyze the loss and occurrence of noise in the network, and the calculation formula of noise transmission in the cascaded two-port lossy network is derived. This formula has been used to determine the thermal noise standard source of the noise temperature of the capital.