| 摘要 |
PURPOSE:To perform hardly from being affected externally, by making the liminating construction of metallic tape isolated mutually for external conductor and shifting the opening of each layer. CONSTITUTION:An external conductor 23 consists of a metallic tape 6 longitudinally attached to have an opening 41 and a metallic tape 8 longitudinally added to have an opening 42. The metallic tapes 6 and 8 are isolated with an insulator 7. The insulator 7 is formed by extrusion of plastic and winding of plastic tape. The thickness depends on the conditions like frequency and diameter of line, but it is required to have the thickness to avoid mutual capacitance substantially. Further, it is necessary to provide the openings 41, 42 being shifted with each other so that the stray capacitance from the line externally can not give effect on an inner conductor 1, then they are shifted by 180 deg.. |
