Radio-frequency seal at interface of waveguide blocks

Patent metadata

Field	Value
Publication number	US-10985448-B2
Application number	US-201816489829-A
Country	US
Kind code	B2
Filing date	Mar 20, 2018
Priority date	Mar 20, 2017
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

The described features include a scalable waveguide architecture for a waveguide device. The waveguide device may be split into one or more waveguide blocks instead of manufacturing increasingly larger single-piece waveguide devices. Described techniques provide for a radio-frequency (RF) seal between such waveguide blocks that may facilitate greater manufacturing tolerances while maintaining an effective RF seal at the junction of the waveguide blocks. The described techniques include channels within one or more waveguide blocks opening to the dielectric gap between the waveguide blocks. The channels may, for each of multiple waveguides joined at the interface between waveguide blocks, be included in one or both waveguide blocks and may be in a single waveguide dimension relative to the multiple waveguides, or extend for more than one waveguide dimensions.

First claim

What is claimed is:

1. A waveguide device, comprising:
a first waveguide block comprising first sections of a plurality of waveguides, the first waveguide block comprising:
a first face comprising first openings for the first sections of the plurality of waveguides; and
a plurality of first channels, each of the plurality of first channels located at a first length along the first face from one of the first openings, the plurality of first channels extending into the first waveguide block a second length; and

a second waveguide block comprising second sections of the plurality of waveguides, the second waveguide block comprising:
a second face comprising second openings for the second sections of the plurality of waveguides,

wherein, upon coupling the first face of the first waveguide block with the second face of the second waveguide block, first portions of a plurality of first waveguide stubs are formed by first portions of dielectric gaps between the first face and the second face extending for the first length, and second portions of the plurality of first waveguide stubs are formed by the plurality of first channels, and wherein lengths of the plurality of first waveguide stubs are based at least in part on an operational frequency of the plurality of waveguides.

2. The waveguide device of claim 1 , wherein a first impedance of the plurality of first waveguide stubs to the plurality of waveguides at each of the first openings is less than a wave impedance of the plurality of waveguides.

3. The waveguide device of claim 1 , wherein:
the second waveguide block comprises a plurality of second channels, each of the plurality of second channels located at the first length along the second face from one of the second openings, the plurality of second channels extending into the second waveguide block the second length; and
upon the coupling of the first face of the first waveguide block with the second face of the second waveguide block, first portions of a plurality of second waveguide stubs are formed by second portions of the dielectric gaps between the first face and the second face, the second portions of the dielectric gaps being the first length along the second face, and second portions of the plurality of second waveguide stubs are formed by the plurality of second channels, wherein lengths of the plurality of second waveguide stubs are based at least in part on the operational frequency of the plurality of waveguides.

4. The waveguide device of claim 3 , wherein, upon the coupling of the first face of the first waveguide block with the second face of the second waveguide block, the plurality of first channels are located in a first direction along the first face and the plurality of second channels are located in a second direction along the second face, the first direction being opposite of the first openings from the second direction.

5. The waveguide device of claim 1 , wherein the first openings for the first sections of the plurality of waveguides define planes perpendicular to respective center axes of the plurality of waveguides.

6. The waveguide device of claim 1 , wherein each of the plurality of first channels has a first set of opposing walls that are parallel with each other, and wherein a first dimension of a cross section of each of the plurality of first channels in a transverse plane corresponds to a first dimension of the first openings.

7. The waveguide device of claim 6 , wherein a second dimension of the cross section of each of the plurality of first channels in the transverse plane is less than a second dimension of the first openings.

8. The waveguide device of claim 1 , wherein each of the plurality of first channels has a first set of opposing walls that are parallel with each other, and wherein the first set of opposing walls comprises a turn extending each of the plurality of first channels along more than one dimension of the first openings.

9. The waveguide device of claim 1 , wherein each of the plurality of first channels encircles one of the first openings.

10. The waveguide device of claim 1 , wherein second portions of the dielectric gaps extend away from the first openings along the first face from junctions of the first portions of the dielectric gaps with openings of the plurality of first channels.

11. The waveguide device of claim 1 , wherein the first face comprises a first planar section and a second planar section, the second planar section being offset from the first planar section along a dimension perpendicular to the first planar section.

12. The waveguide device of claim 11 , wherein:
the first face comprises a third planar section between the first and second planar sections; and
the first openings are located on the third planar section of the first face.

13. The waveguide device of claim 11 , wherein the first waveguide block comprises a protrusion on the first planar section having a first edge parallel to the first planar section and a second edge that is non-parallel with the first planar section, the second edge of the protrusion housing the plurality of first channels.

14. The waveguide device of claim 13 , wherein the second waveguide block comprises a step corresponding to the second edge of the protrusion of the first waveguide block, and wherein a width of the dielectric gaps between the first edge of the first waveguide block and the second waveguide block is different from a width of the dielectric gaps between the second edge of the protrusion of the first waveguide block and the step of the second waveguide block.

15. The waveguide device of claim 1 , wherein the first portions of the dielectric gaps comprise E-plane bends.

16. The waveguide device of claim 1 , wherein an angle of at least one set of opposing walls of each of the plurality of first channels relative to the first face is other than ninety degrees.

17. The waveguide device of claim 1 , wherein the lengths of the plurality of first waveguide stubs are one half-wavelength of the operational frequency of the plurality of waveguides.

18. The waveguide device of claim 17 , wherein the plurality of first channels comprise blind waveguide stubs.

19. The waveguide device of claim 1 , wherein the first length is one quarter-wavelength of the operational frequency of the plurality of waveguides.

20. The waveguide device of claim 1 , wherein the second length is one quarter-wavelength of the operational frequency of the plurality of waveguides.

21. The waveguide device of claim 1 , wherein at least one of the first or second waveguide blocks comprises a plurality of polarizers, the plurality of polarizers including an individual waveguide and first and second divided waveguides associated with first and second polarizations.

22. The waveguide device of claim 21 , wherein each of the plurality of waveguides correspond to one of the first and second divided waveguides.

Assignees

• Viasat Inc

Inventors

• Bongard Frederic
• Aubry Xavier
• Gimersky Martin

Classifications

• H01Q5/55 Primary

  for horn or waveguide antennas · CPC title

• H01Q25/001

  Crossed polarisation dual antennas (orthomode horns H01Q13/0258; cross-polarised rear feeds H01Q19/136; orthomode transducers H01P1/161) · CPC title

• H01Q21/064

  using horn or slot aerials (slotted waveguides arrays H01Q21/005) · CPC title

• H01Q21/24

  Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction {(circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001)} · CPC title

• H01P1/173

  using a conductive element · CPC title