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本文首次指出了纵向金属条加载螺旋线的滤波性质这一新问题。这种慢波结构的滤波性质有别于过去国外所提出的滤波螺旋线。它不仅能够构成窄通带的行波管,而且也可以构成超宽通带行波管。其次,用它作为行波管的慢波线时,它的横向阻抗可以压低,易于与外接耦合头直接匹配,而它的耦合阻抗仍可保留较高的数值,使行波管在超宽通带范围内仍可获得较大的增益分贝数。滤波性慢波线行波管的另一优点,是它的抑止返波振荡的性质。纵向金属条加载螺旋线同样具有此一性质。 本文对纵向金属条加载螺旋线的滤波性质作了理论分析,对它的色散特性作了冷测试验,两者有良好的相符。 纵向金属条加载螺旋线的计算,在美国系用Paik的方法,而在苏联有方法。这二个方法仅解决了色散的计算,而完全没有涉及滤波的性质,因而也没有提出诸如通带、禁带、抑止返波振荡、金属条数目、金属条宽窄和激励头地位等等的性质和问题。本文的理论分析对这许多问题均作出了回答,理论分析符合冷测结果,因而它可供设计计算之用。
This paper first points out the new problem of the filtering property of the helical wire loaded with longitudinal strips. The filtering property of this slow-wave structure is different from the filtering helix proposed in the past. It can not only form a narrow passband traveling wave tube, but also can form ultra wide passband traveling wave tube. Secondly, when it is used as a slowwave line of traveling wave tube, its lateral impedance can be lowered and it is easy to directly match with the external coupling head, while its coupling impedance can still retain a higher value, With the range can still get larger gain decibels. Another advantage of the slow-traveling wave-TWT is its suppression of the return-wave oscillation. Longitudinal metal strip loading helix also has this property. In this paper, the theoretical analysis of the filtering properties of the helical strip loaded with longitudinal metal strips is made, and the chromatic dispersion characteristics of the strip is tested coldly. The two are in good agreement. Longitudinal metal strip loading helix calculations in the United States Department Paik method, and in the Soviet Union there is a way. These two methods only solve the calculation of the dispersion without any mention of the nature of the filtering and therefore do not suggest such properties as the passband, the forbidden band, the suppression of the return-wave oscillation, the number of the metal strips, the width of the metal strips, the position of the head, etc. And the problem. The theoretical analysis of this article has answered many questions, and the theoretical analysis is consistent with the cold test results, so it can be used for design calculation.