Waveguide structures

Patent metadata

Field	Value
Publication number	US-10356964-B2
Application number	US-201615215982-A
Country	US
Kind code	B2
Filing date	Jul 21, 2016
Priority date	Jul 21, 2016
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

Examples described herein include an electromagnetic interference shield. In some examples, the electromagnetic interference shield includes a wall comprised of a conductive material. The wall may have a first surface, a second surface, and a thickness between the first surface and the second surface. The shield may include a rounded opening in the wall that creates an air passageway through the thickness of the wall. The shield may also include a first obstruction in the opening and a second obstruction in the opening. The first obstruction may span across the opening. The second obstruction may span across the opening and intersect the first obstruction. The first obstruction and the second obstruction may be waveguide structures.

First claim

What is claimed is:

1. An electromagnetic interference shield comprising:
a wall comprised of a conductive material, the wall having a first surface, a second surface, and a thickness between the first surface and the second surface;
a rounded opening in the wall, the opening creating an air passageway through the thickness of the wall;
a first obstruction in the opening, the first obstruction spanning across the opening; and
a second obstruction in the opening, the second obstruction spanning across the opening and intersecting the first obstruction, wherein the first obstruction and the second obstruction form waveguide structures in the rounded opening, and wherein the first obstruction and the second obstruction do not extend beyond the first surface.

2. The electromagnetic interference shield of claim 1 ,
wherein the first obstruction bisects the opening; and
wherein the second obstruction bisects the opening.

3. The electromagnetic interference shield of claim 2 , wherein the second obstruction bisects the first obstruction.

4. The electromagnetic interference shield of claim 3 , wherein the opening has a circular cross section.

5. The electromagnetic interference shield of claim 4 , wherein the first obstruction and the second obstruction divide the opening into four quadrants.

6. The electromagnetic interference shield of claim 1 , wherein the first obstruction has a thickness extending along the passageway of the opening.

7. The electromagnetic interference shield of claim 1 , wherein the second obstruction has a thickness extending along the passageway of the opening.

8. The electromagnetic interference shield of claim 1 ,
wherein the passageway has a vertical cross-sectional area;
wherein the first obstruction and the second obstruction together have a total vertical obstruction cross-sectional area; and
wherein the total vertical obstruction cross-sectional area is equal to or less than 20% of the vertical cross-sectional area of the passageway.

9. The electromagnetic interference shield of claim 1 , wherein a cutoff frequency of the waveguide structures is 5-40 GHz.

10. An electromagnetic interference shield comprising:
a wall comprised of a conductive material, the wall having a thickness and an internal surface;
a waveguide structure extending through the thickness of the wall, the waveguide structure comprising:
a first perimeter;
a second perimeter, wherein the first perimeter is connected to the second perimeter by the internal surface;
a first bar extending on the internal surface; and
a second bar extending on the internal surface, the second bar intersecting the bar; wherein the second bar does not extend pass the internal surface.

11. The electromagnetic interference shield of claim 10 ,
wherein the first perimeter has a circular cross section; and
wherein the second perimeter has a circular cross section.

12. The electromagnetic interference shield of claim 11 , wherein the internal surface is curved.

13. The electromagnetic interference shield of claim 10 , wherein the waveguide structure comprises an airflow passageway between the internal surface, the first bar, and the second bar.

14. The electromagnetic interference shield of claim 10 , wherein the first bar bisects the second bar.

15. The electromagnetic interference shield of claim 10 , wherein the cutoff frequency of the waveguide structure is from 5 GHz to 40 GHz.

16. An electronic device comprising:
an electromagnetic radiator; and
a housing comprised of conductive material enclosing the electromagnetic radiator, the housing comprising a first surface and a second surface; and
a first waveguide structure in the housing, the first waveguide structure comprising:
a first circular perimeter formed in the first surface;
a second circular perimeter formed in the second surface;
a first internal surface extending between the first circular perimeter and the second circular perimeter; and
a first cross extending along the first internal surface, wherein the first cross does not extend beyond the first surface.

17. The electronic device of claim 16 , wherein the first waveguide structure comprises at least one air passageway between the cross and the first internal surface.

18. The electronic device of claim 17 , wherein the electronic device comprises a second waveguide structure in the housing, the second waveguide structure comprising
a third circular perimeter;
a fourth circular perimeter;
a second internal surface extending between the third circular perimeter and the fourth circular perimeter; and
a second cross extending along the second internal surface, wherein the second cross has a width that is smaller than a distance from the first circular perimeter to the third circular perimeter.

19. The electronic device of claim 18 , wherein a cutoff frequency of the first and second waveguide structures is 5-40 GHz.

Assignees

• Hewlett Packard Entpr Dev Lp

Inventors

• Chobanyan Elene
• Bois Karl J
• Mayer Dave
• Roesner Arlen L

Classifications

• H05K9/0007 Primary

  Casings (standardised racks H05K9/0062) · CPC title

• H01P1/30 Primary

  for compensation of, or protection against, temperature or moisture effects {; for improving power handling capability (H01P1/04, H01P1/08 take precedence)} · CPC title

• H01P5/024

  between hollow waveguides · CPC title

• H05K9/0041

  Ventilation panels having provisions for screening · CPC title