WIRING AND COMPOSITE WIRING

• US 20110042120A1
• Filed: 02/02/2009
• Published: 02/24/2011
• Est. Priority Date: 01/31/2008
• Status: Abandoned Application

• Current Assignee: Fujitsu Semiconductor Limited (Fujitsu Limited), Ibiden Co., Ltd., Kyocera Corporation, NEC Corporation, Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Original Assignee: Fujitsu Semiconductor Limited (Fujitsu Limited), Ibiden Co., Ltd., Kyocera Corporation, NEC Corporation, Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Inventors: Usami, Tamotsu, Akiyama, Yutaka, Ueda, Chihiro, Otsuka, Kanji
• Application Number:
  US12/865,555
• Publication Number:
  US 20110042120A1
• Time in Patent Office: Days
• US Class Current: 174/113.00R
• CPC Class Codes: H01P 3/00 Waveguides; Transmission lines of the waveguide type

Abstract

A wire (a twisted pair cable) that transmits a gigahertz band signal and that is provided with a pair of core wires that are twisted with each other, a first insulation coating material, a second insulation coating material, and a shield material that shields evanescent waves emitted from the pair of core wires. The pair of core wires have a twisting pitch, a diameter, and a spacing so that the wire has a characteristic impedance of 100 to 200Ω and the phases of the TEM (Transverse Electro-Magnetic) wave and the evanescent wave that are emitted from the pair of core wires are matched.

Claims

1. A wire that transmits a gigahertz band signal comprising:

a pair of core wires that are twisted with each other;

a pair of first insulation coating materials that coat each of the core wires;

a second insulation coating material that coats the pair of first insulation coating materials; and

a shield material that coats the second insulation coating material and that shields evanescent waves emitted from the pair of core wires, wherein

the pair of core wires have a twisting pitch, a diameter, and a spacing so that the wire has a characteristic impedance of 100 to 200Ω and

the phases of the TEM (Transverse Electro-Magnetic) wave and the evanescent wave that are emitted from the pair of core wires are matched.

2. The wire according to claim 1, wherein

the twisting pitch of the core wires is set so that the effective length of the TEM wave becomes the square root of twice a line length of the pair of core wires.

3. The wire according to claim 1, wherein

the twisting pitch of the core wires is 10.3 mm.

4. The wire according to claim 1, wherein

the diameter of the core wires is 0.3 mm.

5. The wire according to claim 1, wherein

the spacing of the core wires is 1.36 mm.

6. The wire according to claim 1, wherein

a shock absorbing material is provided on the outside of the shield material to relieve shock from an external force.

7. A composite wire wherein a plurality of the wires according claim 1 is provided.