Flexible printed circuit board
A flexible printed circuit board wherein the insulative substrate 34 having a plurality of conductive layers 36 b covered with a protective layer 38 is encircled by a mesh-cloth member 32.
1. A flexible printed circuit board comprising:
an insulative substrate having a plurality of ground conductive layers and a signal-transmission conductive layer formed between said ground conductive layers; and
a reticulate covering member formed of a dielectric having voids for covering said insulative substrate wherein said reticulate covering member is a tube formed to have a predetermined gap from said insulative substrate; and
wherein said insulative substrate is disposed inside of said tube.
2. The flexible printed circuit board as claimed in claim 1 , wherein said reticulate covering member is formed of a dielectric having a relative dielectric constant in a range from 2 to 4.
3. The flexible printed circuit board as claimed in claim 1 , wherein a thickness and a porosity of said reticulate covering member are from 0.3 mm to 1 mm and 50% or more, respectively.
4. A flexible printed circuit board comprising:
an insulative substrate having a plurality of ground conductive layers and a signal-transmission conductive layer formed between said ground conductive layers; and
a reticulate covering member formed of a dielectric having voids for covering said insulative substrate, and having a conductive layer on the outer circumference thereof, said conductive covering layer being electrically connected to an end of said ground conductive layer,
wherein said reticulate covering member is a tube formed to have a predetermined gap from said insulative substrate; and
wherein said insulative substrate is disposed inside of said tube.
5. The flexible printed circuit board as claimed in claim 4 , wherein said conductive covering layer is a metallic film or a conductive cloth.
6. The flexible printed circuit board as claimed in claim 4 , wherein said conductive covering layer is a radio wave absorber.