| 摘要 |
A microstrip line for a printed wiring board such as a flexible printed wiring board which includes a sandwiched thin insulating layer and cannot use a solid grounding conductor, the microstrip line being such that shape of grounding conductors relative to signal lines remains unchanged even in the presence of a curved shape and that overlapping areas of signal lines and grounding conductors located opposite to each other remain unchanged even in case of exposure misalignment or stack misalignment. A printed wiring board with a microstrip line structure in which signal lines are curved include wire-type grounding conductors located across an insulating layer from the signal lines, characterized in that wiring pitch of the grounding conductors is 1/n of width of the signal lines (where n is a natural number of 1 or 2).
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