Abstract: The invention discloses a three-dimensional complementary-conducting-strip (CCS) structure. Some two-dimensional mesh metal layers are stacked vertically and connected mutually via numerous vias to form a three-dimensional network structure, and one or more signal lines with three-dimensional trace style(s) are positioned inside and separated away the three-dimensional network structure. Moreover, each two-dimensional mesh metal layer is a planar metal layer with one or more empty areas. The three-dimensional network structure is grounded, the signal lines(s) is electrically connected to the device(s) and/or terminal(s) respectively, and the dielectric material(s) is used to electrically insulate the signal line(s) from the three-dimensional network structure.