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cold circuit
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     Electronic Circuit Compensation Techniques for Cold Ends of Thermocouples
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This paper presents a new problem on the filter properties of the axial conductor loaded helix. By using the equivalent transmission network analysis, it shows that the filter properties are different from those of the structures as suggested in narrow band TWT. In this kind of structure, the TWT can be constructed not only in narrow band operation, but also can be constructed in super-wide band operation.The theoretical analysis of the axial conductor loaded helix shows that its transverse impedance can be...

This paper presents a new problem on the filter properties of the axial conductor loaded helix. By using the equivalent transmission network analysis, it shows that the filter properties are different from those of the structures as suggested in narrow band TWT. In this kind of structure, the TWT can be constructed not only in narrow band operation, but also can be constructed in super-wide band operation.The theoretical analysis of the axial conductor loaded helix shows that its transverse impedance can be loaded lower enough even to 50 ohms and easy matched to the external coaxial coupler directly, while at the same time, it still maintains the coupling impedance in rather higher values and obtains high gain in TWT.The one of the distinguished advantage of the filter type slow wave circuit using in TWT is its property of suppression the BWO. Axial conductor loaded helix also has such kind of property. Dr. Otto Sauseng of USA in 1970 had adopted this kind of slow wave circuit in his TWT, no BWO occured, yet he gave no explaination. Actually, as shown in this paper, the suppression of BWO is due to the filter property of the structure. The TWT when using this kind of structure shows that the operation is quite stable. The theoretical calculation method of the axial conductor loaded helix as used in USA is the S. F. Paik's method, while in USSR the H. H. method is used. But these two methods mainly gave out the dispersion relations, no filter properties were pointed out, and no such kind of characteristics as the pass-band, the stop band, the suppression of BWO, the effect of the numbers of metalic conductor, the effect of the dimensions of the metalic conductor, and the effect of the position of the coaxial coupler, were revealed out. While in this paper, all these problems are analyzed and relations are given. Besides, the cold circuit experiment has been performed and the dispersion curve obtained is shown more close in this method than in S. F. Paik's method, and the match of the input coupler in super-wide band is also quite well. Therefore this filter analyzing method can be used to design such kind of loaded helix for super-wide band TWT.

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。

 
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