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引言马克·吐温生前有一个著名的声明:宣告他的“死亡”是彻头彻尾的夸大。这个声明用来说明微波管的现状也是非常合适的。尽管怀疑论者长期以来一直预言微波管将让位于固态器件,但这只是在小信号、低功率应用方面才出现这种情况。由于固态器件进展的速度比较缓慢,在微波和毫米波频域产生功率的能力方面,电子管仍然保持其地位。微波管性能的提高,部分原因是由于高磁能积磁性材料的开发,另外,随着阴极电子发射技术的进展,阴极发射电流密度可高达100A/cm~2,这样就可能使管子达到更高
INTRODUCTION Mark Twain had a well-known statement before his death: declaring his “death” to be an outspoken exaggeration. This statement is used to illustrate the status of the microwave tube is also very suitable. Although skeptics have long predicted that microwave tubes will give way to solid-state devices, this is only true for small-signal, low-power applications. Due to the relatively slow progress of solid-state devices, the tube retains its position in terms of its ability to generate power in the microwave and millimeter-wave frequency domains. The improvement of the performance of the microwave tube is due in part to the development of high-energy-product magnetic materials. In addition, with the progress of the cathode electron emission technology, the cathode emission current density can reach as high as 100 A / cm2, which makes it possible to achieve a higher tube