近来,已有可能制造介于常规同轴电缆和波导之间的高频电缆,这种结构形式的传输损耗,在按单位截面下的衰减来衡量时,比通常的要低得多。这种电缆以偶极模进行传输,同时,就象在通常的同轴电缆中一样,它也有屏蔽,还有由一组平行的金属导线形成的同心圆柱结构作为内导体,由它来替代比较常见的实心金属线或金属管内导体。至于偶极模,由于它在光纤方面的应用,已经为人们所熟知。 Recently, it has been possible to fabricate high frequency cables between conventional coaxial cables and waveguides. Transmission losses of this type of construction, as measured by attenuation at unit cross sections, are much lower than usual. This cable transmits in dipole mode and, at the same time, is also shielded, as in the usual coaxial cable, with a concentric cylindrical structure formed by a set of parallel metal conductors as an internal conductor, replacing it by comparison Common solid metal wire or metal pipe inner conductor. As for the dipole mode, it is already well-known because of its use in optical fibers.