美国贝尔研究所今年二月发表了关于无(固体)介质超导同轴电缆理计算的论文,现简要归纳如下:由于介质材抖损耗随温度升高而迅速增加,在高Tc超导同轴电缆中即使采用聚四氟乙烯,在100千兆赫下衰减也要高达1000分贝/公里。利用超导体的迈斯纳(Meissner)效应(即磁力线实际上完全被排挤在超导体表面以外)将内导体悬浮在外导体内部,可使电缆固有衰减很低,相位常数在一阶近似下与频率成线性关 The United States Bell Institute in February this year, published on the (solid) dielectric superconducting coaxial cable theoretical calculations are summarized as follows: As dielectric loss increases rapidly with increasing temperature, high Tc superconducting coaxial Even with polytetrafluoroethylene in the cable, the attenuation at 100 GHz is as high as 1000 dB / km. Using the Meissner effect of the superconductor (ie, the lines of force are virtually completely squeezed out of the surface of the superconductor), the inner conductor is suspended inside the outer conductor so that the inherent attenuation of the cable is low and the phase constant becomes linear with frequency in first-order approximation turn off