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我们认为,严格采用在内部改变慢波电路相速的方法,有可能使行波管的P_(输出)对P(输入)的功率传输特性线性化。如果达到这一目的,行波管的调幅/调幅特性就接近固有效率显著提高(1～3分贝)的硬限幅器的特性,而调幅/调相转换特性与未改进的行波管差不多,例如不超过3°/分贝。目前我们正在努力研究这样的技术:即将调幅/调相转换数值减小到较小的值。在这里我们将简要介绍“动态速度渐变”(DVT)理论,并报道怎样把这一理论用于计算两种不同的行波管的情况。本文说明了这两种行波管(一种是K_a波段行波管,另一种是适用于空间广播的K_a波段行波管)未改进型和改进型分别在动态速度渐变情况下由计算和测量得到的功率传输特性。动态速度渐变的基本方案是:在行波管内
In our opinion, strictly adopting the method of internally changing the phase velocity of the slow-wave circuit makes it possible to linearize the P_ (output) of the traveling-wave tube to the power transfer characteristic of P (input). If this is achieved, the amplitude / amplitude modulation characteristics of the traveling-wave tube approach those of the hard limiter with inherently higher efficiency (1 to 3 dB), while the amplitude / phase modulation characteristics are comparable to the unmodified TWT, For example no more than 3 ° / decibel. We are currently working on a technique that reduces the AM / PM conversion value to a smaller value. Here we will briefly introduce “Dynamic Speed Gradient” (DVT) theory and report how to apply this theory to the calculation of two different traveling wave tubes. This paper describes the two traveling wave tubes (one is the K_a band traveling wave tube and the other is the K_a band traveling wave tube which is suitable for space broadcasting). The unmodified type and the improved type are respectively calculated by calculation and Measured power transfer characteristics. Dynamic speed gradient of the basic program is: in the traveling wave tube