Discontinuous shielding tapes for data communications cable
The present arrangement provides a communication cable having a plurality of twisted pair communication elements, a jacket surrounding the twisted pairs and a shield element disposed between the pairs and the jacket. The shield element is constructed as a tape substrate with a plurality of foil shielding elements disposed thereon, the foil shielding elements being formed in the shape of triangles and arranged on the substrate with at least a first foil shield element having a base of its triangle shape disposed substantially parallel to a longitudinal edge of the tape substrate. Each subsequent triangle is disposed on the tape substrate at a distance apart from the first triangle foil shielding element with a base of its triangle shape disposed substantially parallel to an opposite longitudinal edge of the tape substrate.
1. A communication cable, said cable comprising:
a plurality of twisted pair communication elements;
a jacket surround said twisted pairs; and
a shield element disposed between said pairs and said jacket, wherein said shield element is constructed as a solid tape substrate with a plurality of foil shielding elements disposed thereon, the foil shielding elements being formed in the shape of triangles and arranged on said substrate with at least a first foil shield element having a base of its triangle shape disposed substantially parallel to a longitudinal edge of said tape substrate with each subsequent triangles disposed on said tape substrate at a distance apart from said first triangle foil shielding element with a base of its triangle shape disposed substantially parallel to an opposite longitudinal edge of said tape substrate.
2. The communication cable as claimed in claim 1 , wherein tape substrate is constructed of a material selected from the group consisting of polyethylene terephthalate, polypropylene, and cellulose acetate butyrate.
3. The communication cable as claimed in claim 1 , wherein said tape substrate is substantially 0.001″ to 0.005″ in thickness.
4. The communication cable as claimed in claim 1 , wherein tape substrate is substantially 0.250″ to 3.000″ in width.
5. The communication cable as claimed in claim 1 , wherein said foil shielding elements are substantially 0.0005″ to 0.0050″ in thickness.
6. The communication cable as claimed in claim 1 , wherein said substrate is substantially 1″ wide, has a thickness of substantially 0.0015″ thick and constructed of polyethylene terephthalate with said triangular metal foil elements each having a base of substantially 2″ wide, a height of substantially 1″ across the width of said substrate with 45 degree angles at the base and a 90 degree angle at the vertex.
7. The communication cable as claimed in claim 1 , wherein a gap between any two triangular metal foil elements is substantially 0.040″ or less.
8. The communication cable as claimed in claim 1 , wherein said foil shielding elements are disposed on both sides of said substrate.
9. The communication cable as claimed in claim 1 , wherein said foil shielding elements and gaps therebetween are arranged on said substrate such that communications signals passing through said twisted pairs, reflecting off of said foil shielding elements generated standing waves, where such standing waves are distributed over wide range of frequencies.
10. The communication cable as claimed in claim 1 , wherein said foil shielding elements are disposed on a side of said substrate facing inwards towards said twisted pairs of said cable.