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本文论述了多节数正交场返向波放大器的设计原理,并根据这种设计原理提出了带杆线慢波结构的设计方法,采用6912电子计算机对慢波结构的色散特性进行了计算。冷测结果与计算数据有较好的一致性。在中心频率,相移的设计计算值与冷测值的相对误差为4%。本设计采用四级切比雪夫双脊弓波导阻抗变换器,通过渐变式双线传输带来匹配慢波结构与输入输出迴路,经过大量的调配试验,获得了较好的整管匹配特性。在2500～2900兆赫即15%的频带内,整管的电压驻波比小于2;冷通特性较好,插入损耗约为1分贝。此外,还用6912电子计算机计算了冷阴极的起动特性。计算结果表明采用铂金冷阴极在整个工作频带内完全能正常起动,热测试验证明了这个计算结果的可靠性。在完成了大量的专题试验的基础上,仅用二套零件就研制出二只密封管,并进行了热测试验,均获得了较好的放大性能。脉冲功率输出均超过1兆瓦(设计值为700千瓦)。在激励管所能提供的10%带宽内均能放大,如果激励管有足够带宽的话,该管可望获得大于10%的频带。增益为10～13分贝。效率45%～53%。这些参数接近或超过国外报导的同类器件的水平。
In this paper, the design principle of multi-section orthogonal field return-to-back-wave amplifier is discussed. According to this design principle, a design method of rod-line slow-wave structure is proposed. The dispersion characteristics of the slow-wave structure are calculated by using 6912 computer. Cold test results and calculated data have good consistency. At the center frequency, the relative error between the calculated and the measured values of the phase shift is 4%. This design uses four Chebyshev double ridge bow waveguide impedance converter, through a gradual two-wire transmission to match the slow-wave structure and input and output circuits, after a large number of deployment tests, get a better matching characteristics of the entire pipe. In 2500 ~ 2900 MHz or 15% of the band, the voltage VSWR of the whole tube is less than 2; the cold-pass characteristics are better, and the insertion loss is about 1 dB. In addition, the start-up characteristics of the cold cathode were also calculated using a 6912 computer. The calculation results show that the use of platinum cold cathode in the entire operating frequency band can be normal start, thermal test proved the reliability of this calculation. On the basis of completing a large number of special experiments, two sealed tubes were developed with only two sets of parts, and the thermal test was conducted to obtain better amplification performance. Pulse power output is more than 1 MW (design value of 700 kW). Amplification is possible within 10% of the bandwidth provided by the exciter tube, which is expected to have a band greater than 10% if the exciter tube has sufficient bandwidth. Gain of 10 to 13 dB. Efficiency 45% ~ 53%. These parameters close to or exceed the level of similar devices reported abroad.