Electromagnetic termination with a ferrite absorber

• US 20040119552A1
• Filed: 12/20/2002
• Published: 06/24/2004
• Est. Priority Date: 12/20/2002
• Status: Abandoned Application

• Current Assignee: Com Dev Limited (Honeywell International Inc.)
• Original Assignee: Com Dev Limited (Honeywell International Inc.)
• Inventors: Wray, Gordon Thomas
• Application Number:
  US10/323,895
• Publication Number:
  US 20040119552A1
• Time in Patent Office: Days
• US Class Current: 333/22R
• CPC Class Codes: H01P 1/22 Attenuating devices dissipative terminating devices H01P1/26
• CPC Class Codes: H01P 1/26 Dissipative terminations

Abstract

A device for absorbing at least a portion electromagnetic energy that is provided by a transmission line and transferring the resulting heat generated by absorption to a heat sink. The device has a housing in communication with the transmission line for receiving the electromagnetic energy. The housing also provides at least a portion of an internal transmission line for confining and guiding the electromagnetic energy within the device. The housing is also in communication with the heat sink for transferring the resulting heat thereto. The device also has an absorber that is in communication with the housing for receiving the electromagnetic energy, absorbing at least a portion of the electromagnetic energy and providing resulting heat to the housing. The absorber comprises ferrite.

Claims

1. A device for absorbing at least a portion of electromagnetic energy provided by a transmission line and for transferring resulting heat generated by absorption of said at least portion of electromagnetic energy to a heat sink, said device comprising:

a) a housing in communication with said transmission line for receiving said electromagnetic energy and for providing at least a portion of an internal transmission line for confining and guiding said electromagnetic energy within said device, said housing also being in communication with said heat sink for transferring said resulting heat thereto; and

,

b) an absorber in communication with said housing for receiving said electromagnetic energy, absorbing said at least portion of electromagnetic energy and providing said resulting heat to said housing, wherein said absorber comprises ferrite.

2. The device of claim 1, wherein said internal transmission line further comprises a conductor disposed within said housing.

3. The device of claim 1, wherein said device is a termination and said absorber is adapted to absorb substantially all of said electromagnetic energy provided by said transmission line.

4. The device of claim 1, wherein said device is an attenuator, said attenuator further being in communication with a downstream transmission line for providing remaining electromagnetic energy thereto.

5. The device of claim 1, wherein said device comprises an attenuator and a downstream termination, said attenuator in communication with said termination, wherein at least one of the attenuator and the termination have a housing and an absorber in accordance with the housing and absorber of said device.

6. The device of claim 5, wherein the attenuator and the termination are in the same housing.

7. The device of claim 1, wherein said ferrite has a thermal conductivity of at least approximately 3.2 W/m·

K.

8. The device of claim 1, wherein said ferrite has a Curie temperature of at least approximately 300°

C.

9. The device of claim 1, wherein said ferrite has a dielectric constant of at least approximately 12.

10. The device of claim 1, wherein said ferrite is sintered.

11. The device of claim 1, wherein said ferrite is a Ni—

Zn ferrite.

12. The device of claim 11, wherein said Ni—

Zn ferrite has approximately a 20% Ni composition and an 80% Zn composition.

13. The device of claim 1, wherein said ferrite is a Lithium-based ferrite.

14. The device of claim 13, wherein said Lithium-based ferrite has a Curie temperature of approximately at least 300°

C.

15. The device of claim 1, wherein said absorber is a composite absorber comprising an absorber and a dielectric.

16. The device of claim 15, wherein said dielectric has a lower dielectric constant than said absorber.

17. The device of claim 1, wherein said absorber has a thickness that is varied to vary the absorption profile of said absorber.

18. The device of claim 17, wherein the thickness of said absorber varies along the direction of propagation of said electromagnetic energy.

19. The device of claim 17, wherein the thickness of said absorber varies in a direction transverse to the direction of propagation of said electromagnetic energy.

20. A device for absorbing at least a portion of electromagnetic energy propagated within a transmission line, and for transferring resulting heat generated by absorption of said at least portion of electromagnetic energy to a heat sink, said transmission line having an extension that provides a housing for said device, said housing being in communication with said heat sink for transferring said resulting heat thereto and said housing providing an internal transmission line for confining and guiding said electromagnetic energy within said device, wherein said device additionally includes:

a) an absorber disposed within said housing, said absorber being in communication with said internal transmission line and said housing for receiving said electromagnetic energy, absorbing said at least portion of electromagnetic energy and transferring said resulting heat to said housing, wherein said absorber comprises ferrite.

21. The device of claim 20, wherein said device is a termination and said absorber is adapted to absorb substantially all of said electromagnetic energy propagated within said transmission line.

22. The device of claim 20, wherein said device is an attenuator, said attenuator further being in communication with a downstream transmission line for providing remaining electromagnetic energy thereto.

23. The device of claim 20, wherein said device comprises an attenuator and a downstream termination, the attenuator being in communication with the termination, wherein at least one of the aftenuator and the termination have a housing and an absorber in accordance with the housing and absorber of said device.

24. The device of claim 23, wherein said attenuator and said termination are enclosed within the same housing.

25. The device of claim 20, wherein said ferrite has a thermal conductivity of at least approximately 3.2 W/m·

K.

26. The device of claim 20, wherein said ferrite has a Curie temperature of at least approximately 300°

C.

27. The device of claim 20, wherein said ferrite has a dielectric constant of at least approximately 12.

28. The device of claim 20, wherein said ferrite is sintered.

29. The device of claim 20, wherein said ferrite is a Ni—

Zn ferrite.

30. The device of claim 29, wherein said Ni—

Zn ferrite has approximately a 20% Ni composition and an 80% Zn composition.

31. The device of claim 20, wherein said ferrite is a Lithium-based ferrite.

32. The device of claim 31, wherein said Lithium-based ferrite has a Curie temperature of at least approximately 300°

C.

33. The device of claim 20, wherein said absorber is a composite absorber comprising an absorber and a dielectric.

34. The device of claim 33, wherein said dielectric has a lower dielectric constant than said absorber.

35. The device of claim 20, wherein said absorber has a thickness that is varied to vary the absorption profile of said absorber.

36. The device of claim 34, wherein the thickness of said absorber varies along the direction of propagation of said electromagnetic energy.

37. The device of claim 34, wherein the thickness of said absorber varies in a direction transverse to the direction of propagation of said electromagnetic energy.