| 摘要 |
<p>A flat cable is composed of a signal line, a thin dielectric sheet with which the signal line is coated and that has plasticity, two ground layers that coat the dielectric layer in its thickness direction, extend in the longitudinal direction of the signal line, and that are spaced apart from each other, and insulators that coat the two ground layers so that they are not exposed to the outside. The size of the cross section of the signal line, the thickness and width of the dielectric sheet, and so forth are adjusted for predetermined characteristic impedance. Each of the two ground layers is designated to be sufficiently wider than the signal line.
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