Axial strapping of a multi-core (cascaded) magnetron

Patent metadata

Field	Value
Publication number	US-9711315-B2
Application number	US-201514965219-A
Country	US
Kind code	B2
Filing date	Dec 10, 2015
Priority date	Dec 10, 2015
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

The present disclosure is directed to axial strapping of a multi-core (cascaded) magnetron. The multi-core (cascaded) magnetron includes a cathode and a plurality of cores (anodes) arranged in an axial direction along the cathode. Each of the cores may have a plurality of vanes arranged periodically in an azimuthal direction along a circumference of the cathode and forming by such a way a plurality of resonant cavities. The multi-core (cascaded) magnetron further includes groups of axial straps coupling each of the cores together in the axial direction along the cathode. For example, a first group of axial straps couple the first plurality of vanes of a first core to the second plurality of vanes of a second core. In an embodiment, the axial straps are configured to provide phase synchronization of electromagnetic oscillations induced inside each of the plurality of cores.

First claim

What is claimed:

1. A multi-core magnetron comprising:
a cathode;
a plurality of cores arranged in an axial direction along a length of the cathode, wherein each of the cores has a plurality of vanes arranged periodically in an azimuthal direction along a circumference of the cathode and forming by such a way a plurality of resonant cavities; and
at least one axial strap coupling adjacent cores together in the axial direction along the length of the cathode, wherein a first axial strap couples a first vane of a first core to a first vane of a second core.

2. The multi-core magnetron of claim 1 , wherein the at least one axial strap is configured to provide phase synchronization of electromagnetic oscillations induced inside each of the plurality of cores.

3. The multi-core magnetron of claim 1 , wherein the at least one axial strap has a predetermined length, and wherein the predetermined length provides a predetermined phase difference between electromagnetic oscillations induced inside a pair of the adjacent cores coupled by the at least one axial strap.

4. The multi-core magnetron of claim 3 , wherein each of the cores formed by a plurality of its respective vanes are spaced the predetermined length from each other, wherein the predetermined length is a length of the at least one axial strap.

5. The multi-core magnetron of claim 3 , wherein the predetermined length provides an electrical length between centers of adjacent cores of the multi-core magnetron such that the electrical length is equal or proportional to one half of a wavelength of electromagnetic oscillations induced inside each of the cores.

6. The multi-core magnetron of claim 1 , wherein the at least one axial strap provides phase synchronization of electromagnetic oscillations induced inside each of the cores.

7. The multi-core magnetron of claim 1 , wherein the individual cores are positioned face to face in a linear cascade arrangement along the length of the cathode.

8. The multi-core magnetron of claim 1 , further comprising a plurality of axial straps coupling adjacent cores together in the axial direction along the length of the cathode, wherein each of the plurality of axial straps are positioned parallel with respect to the cathode.

9. The multi-core magnetron of claim 1 , further comprising a plurality of axial straps coupling adjacent cores together in the axial direction along the length of the cathode, wherein each of the plurality of axial straps are positioned along a spiral path with respect to the cathode or at a predetermined angle with respect to the cathode.

10. The multi-core magnetron of claim 8 , wherein the plurality of axial straps electrically couple vanes of each of the cores to vanes of an adjacent core.

11. The multi-core magnetron of claim 1 , wherein the at least one axial strap comprises metal rods or wires.

12. The multi-core magnetron of claim 1 , wherein each of the plurality of cores have a plurality of vanes and a hollow center portion, and wherein each of the plurality of cores have a plurality of resonant cavities arranged around the hollow center portion, and wherein the cathode extends through the hollow center portion of each of the plurality of cores.

13. A multi-core magnetron comprising:
a cathode;
a plurality of cores arranged in an axial direction along a length of the cathode, wherein each of the cores have a plurality of vanes arranged periodically in an azimuthal direction along a circumference of the cathode and forming a plurality of resonant cavities; and
a group of axial straps coupling each of the adjacent cores together in the axial direction along the length of the cathode, wherein each axial strap has a predetermined length to provide phase synchronization of electromagnetic oscillations induced inside the plurality of cores coupled by at least one axial strap.

14. The multi-core magnetron of claim 13 , wherein the group of axial straps is configured to provide phase synchronization of electromagnetic oscillations induced inside each of the plurality of cores.

15. The multi-core magnetron of claim 13 , wherein a first group of axial straps couple a first plurality of vanes of a first core to a second plurality of vanes of a second core, and a second group of axial straps couple a third plurality of vanes of the second core to a fourth plurality of vanes of a third core.

16. The multi-core magnetron of claim 13 , wherein each of the cores formed by a plurality of its respective vanes are spaced the predetermined length from each other, wherein the predetermined length is a length of the axial strap.

17. The multi-core magnetron of claim 13 , wherein the predetermined length provides an electrical length between centers of adjacent cores of the multi-core magnetron such that the electrical length is equal or proportional to one half of wavelength of electromagnetic oscillations induced inside each of the cores.

18. The multi-core magnetron of claim 13 , wherein the group of axial straps provides phase synchronization of electromagnetic oscillations induced inside each of the cores.

19. The multi-core magnetron of claim 13 , wherein the cores are positioned face to face in a linear cascade arrangement along the cathode.

20. The multi-core magnetron of claim 13 , wherein each of the axial straps are positioned parallel with the cathode.

21. The multi-core magnetron of claim 13 , wherein each of the axial straps are positioned along either a spiral path with respect to the cathode or at a predetermined angle with respect to the cathode.

22. The multi-core magnetron of claim 13 , wherein the axial straps comprise metal rods or wires.

23. The multi-core magnetron of claim 13 , wherein the group of axial straps electrically couple vanes of each of the cores to vanes of an adjacent core.

24. The multi-core magnetron of claim 13 , wherein each of the plurality of cores have a plurality of vanes and a hollow center portion, and wherein each of the plurality of cores have a plurality of resonant cavities arranged around the hollow center portion, and wherein the cathode extends through the hollow center portion of each of the plurality of cores.

Assignees

• Raytheon Co

Inventors

• Andreev Andrey D

Classifications

• H01J25/587 Primary

  Multi-cavity magnetrons · CPC title

• H01J23/20

  Cavity resonators; Adjustment or tuning thereof · CPC title

• H01J23/22

  Connections between resonators, e.g. strapping for connecting resonators of a magnetron · CPC title

• H01J23/05

  having a cylindrical emissive surface, e.g. cathodes for magnetrons · CPC title