Cavity Filter, An Isolation Device, And A Node In A Mobile Communications Network

• US 20090167464A1
• Filed: 02/24/2006
• Published: 07/02/2009
• Est. Priority Date: 02/24/2006
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Schon, Lennart
• Granted Patent: US 8,330,561 B2
• Time in Patent Office: Days
• US Class Current: 333/209
• CPC Class Codes: H01P 7/04 Coaxial resonators
• CPC Class Codes: H01P 7/06 Cavity resonators

Abstract

The invention relates to a cavity filter comprising at least one tuning conductor (3) presenting a hollow portion (4), an isolation device (6) for a tuning conductor (3) of a cavity filter, and a node in a mobile communications network, comprising a cavity filter. According to the invention, the tuning conductor (3) comprises an isolation device (6) in a non-conductive material, which isolation device (6) is at least partly inserted into the hollow portion (4), and an insertion element (7) in a conductive material presenting a male thread (7a) that is engaged with an inner surface of the isolation device (6).

Claims

1. A cavity filter comprising at least one tuning conductor presenting a hollow portion, wherein the tuning conductor comprises an isolation device in a non-conductive material, which isolation device is at least partly inserted into the hollow portion, and an insertion element in a conductive material presenting a male thread that is engaged with an inner surface of the isolation device characterised in that an outer surface of the isolation device is at least partly non-cylindrical and at least partly complementary to an inner surface of the hollow portion.

2. The cavity filter according to claim 1, wherein at least a major portion of the outer surface of the isolation device is straight in a direction parallel to a longitudinal direction of the isolation device.

3. The cavity filter according to claim 1, wherein the insertion element is movable in the isolation device by being turned around an axis of its thread.

4. The cavity filter according to claim 1, wherein the isolation device is made in a ductile material.

5. The cavity filter according to claim 1, wherein the isolation device is made in a plastic material.

6. The cavity filter according to claim 1, wherein the isolation device is provided with at least one internal elevation.

7. The cavity filter according to claim 6, wherein the internal elevation is elongated and extends in a longitudinal direction of the isolation device.

8. An isolation device for a tuning conductor of a cavity filter, wherein the tuning conductor presents a hollow portion, the isolation device being in a non-conductive material, and at least partly insertable into the hollow portion, an inner surface of the isolation device being engagable with a male thread of an insertion element in a conductive material and wherein an outer surface of the isolation device is at least partly non-cylindrical, and at least partly complementary to an inner surface of the hollow portion.

9. The isolation device according to claim 8, at which at least a major portion of the outer surface of the isolation device is straight in a direction parallel to a longitudinal direction of the isolation device.

10. The isolation device according to claim 8, in which the insertion element is movable by being turned around an axis of its thread.

11. The isolation device according to claim 8, made in a ductile material.

12. The isolation device according to claim 8, made in a plastic material.

13. The isolation device according to claim 8, provided with at least one internal elevation.

14. The isolation device according to claim 13, wherein the internal elevation is elongated and extends in a longitudinal direction of the isolation device.

15. A node in a mobile communications network, comprising a cavity filter comprising at least one tuning conductor presenting a hollow portion, wherein the tuning conductor comprises an isolation device in a nonconductive material, which isolation device is at least partly inserted into the hollow portion, and an insertion element in a conductive material presenting a male thread that is engaged with the inner surface of the isolation device characterised in that an outer surface of the isolation device is at least partly non-cylindrical, and at least partly complementary to an inner surface of the hollow portion.

16. The node according to claim 15, wherein at least a major portion of the outer surface of the isolation device is straight in a direction parallel to a longitudinal direction of the isolation device.

17. The node according to claim 15, wherein the insertion element is movable in the isolation device by being turned around an axis of its thread.

18. The node according to claim 15, wherein the isolation device is made in a ductile material.

19. The node according to claim 15, wherein the isolation device is made in a plastic material.