Low-noise cable

• US 8,791,364 B2
• Filed: 02/04/2011
• Issued: 07/29/2014
• Est. Priority Date: 04/05/2010
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Paoletti, Umberto
• Primary Examiner(s): Mayo, III, William H
• Application Number:
  US13/021,036
• Publication Number:
  US 20110243255A1
• Time in Patent Office: 1,271 Days
• Field of Search: 174/36, 174/74.R, 174/77.R, 174/78, 174/84.R, 174/88.R, 174/88, 174/110.R, 174/102.R, 333/243
• US Class Current: 174/74.R
• CPC Class Codes: H01P 1/202 Coaxial filters cascaded coaxial cavities H01P1/205
• CPC Class Codes: H01P 3/06 Coaxial lines

Abstract

A low noise communication cable is provided having a plurality of internal conductors covered by one or a plurality of cable shields, which are covered by a cable insulator. The cable includes a quarter wavelength sleeve choke outside the cable insulator connected to the cable shield by means of a conducting support. The sleeve choke reduces the noise current flowing on the external surface of the cable shield.

Claims

1. A low-noise cable comprising:

a shielded cable having an internal conductor covered by an insulator which is wrapped by a conductive cable shield and outside the cable shield is covered by a cable insulator; and

a conducting support without a filter,

wherein the conducting support is connected to the cable shield and extends outside the cable insulator.

2. An electrical equipment comprising:

a first electrical equipment; and

a second electrical equipment,

wherein said first electrical equipment and said second electrical equipment are connected by the low-noise cable as defined by claim 1.

3. An electrical equipment according to claim 2, wherein said first electrical equipment is a controlling and/or processing, unit and said second electrical equipment is an input/output interface controller.

4. An electrical equipment according to claim 2, wherein said first electrical equipment is a storage memory and said second electrical equipment is an input/output interface and/or interface controller.

5. A low-noise cable comprising:

a shielded cable having plural internal conductors which are covered by insulators and said insulators are wrapped with conductive cable shields and outside the conductive cable shields are covered by a cable insulator; and

a conducting support without a filter,

wherein the conducting support is connected to at least one of the cable shields and extends outside the cable insulator.

6. A low-noise cable according to claim 5, further comprising a filter which reduces electromagnetic interference, wherein said filter is a quarter-wavelength sleeve choke which covers said shielded cable, said quarter-wavelength sleeve choke including:

a sleeve choke insulator which wraps the cable insulator; and

a conductive sleeve choke shield which covers the sleeve choke insulator.

7. A low-noise cable according to claim 6, wherein said conductive sleeve choke having a length about a quarter-wavelength of a wavelength applied to the internal conductors.

8. A low-noise cable according to claim 6, wherein said sleeve choke insulator has a larger dielectric constant than the cable insulator.

9. A low-noise cable according to claim 6, wherein said sleeve choke insulator is longer than said conductive sleeve choke shield.

10. An electrical equipment comprising:

a first electrical equipment; and

a second electrical equipment,

wherein said first electrical equipment and said second electrical equipment are connected by the low-noise cable as defined by claim 5.

11. An electrical equipment according to claim 10, wherein said first electrical equipment is a controlling and/or processing unit and said second electrical equipment is an input/output interface controller.

12. An electrical equipment according to claim 10, wherein said first electrical equipment is a storage memory and said second electrical equipment is an input/output interface and/or interface controller.

13. A low-noise cable comprising:

a shielded cable having plural internal conductors each covered by a insulator; and

a conducting support without a filter,

wherein said insulators covering said plural internal conductors are wrapped with conductive cable shield and said conductive cable shield is covered by a cable insulator; and

wherein the conducting support is connected to said conductive cable shield and extends outside the cable insulator.

14. A low-noise cable according to claim 13, wherein some of said plural internal conductors each covered by said insulator are wrapped with an internal conductive shield.

15. A low-noise cable according to claim 13, further comprising a filter which reduces electromagnetic interference, wherein said filter is a quarter-wavelength sleeve choke which covers said shielded cable, said quarter-wavelength sleeve choke including:

a sleeve choke insulator which wraps the cable insulator; and

a conductive sleeve choke shield which covers the sleeve choke insulator.

16. A low-noise cable according to claim 15, wherein said conductive sleeve choke having a length about a quarter-wavelength of a wavelength applied to the internal conductors.

17. A low-noise cable according to claim 15, wherein said sleeve choke insulator has a larger dielectric constant than the cable insulator.

18. A low-noise cable according to claim 15, wherein said sleeve choke insulator is longer than said conductive sleeve choke shield.

19. An electrical equipment comprising:

a first electrical equipment; and

a second electrical equipment,

wherein said first electrical equipment and said second electrical equipment are connected by the low-noise cable as defined by claim 13.

20. An electrical equipment according to claim 19, wherein said first electrical equipment is a controlling and/or processing unit and said second electrical equipment is an input/output interface controller.

21. An electrical equipment according to claim 19, wherein said first electrical equipment is a storage memory and said second electrical equipment is an input/output interface and/or interface controller.