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一、气体放电噪声管的阴极类型及其特性雪崩二极管和气体放电噪声管是微波噪声源的关键器件,它们也是有源器件。目前,国产噪声源以采用噪声管为主,国外固态源发展很快,兼而有之。噪声管的阴极类型有:丝状阴极、间热式阴极、直热式阴极和冷阴极。国外商品源绝大多数使用类似于荧光灯的丝状阴极,国内使用间热式氧化物阴极。噪声管的寿命原则上决定于阴极类型、工作模式、充填气体和压强。在上述几种阴极中,间热式或直热式阴极的寿命最长。据报
First, the cathode type of gas discharge noise tube and its characteristics Avalanche diode and gas discharge noise tube is a key component of microwave noise sources, they are also active devices. At present, the noise source is made mainly by domestic noise sources, and the foreign solid-state sources have been developed rapidly with both. The cathode of the noise tube types are: filament cathode, indirect thermal cathode, direct thermal cathode and cold cathode. The vast majority of foreign sources of goods use filamentous cathode fluorescent lamps similar to the domestic use of intercalation oxide cathode. The life of a noise tube depends in principle on the cathode type, operating mode, filling gas and pressure. In the above several cathodes, the longest life of the indirect thermal or direct thermal cathode. It is reported