Hybrid cavity mode antenna

Patent metadata

Field	Value
Publication number	US-11876279-B2
Application number	US-202016887209-A
Country	US
Kind code	B2
Filing date	May 29, 2020
Priority date	Feb 25, 2020
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

A communication device includes a metal chassis, a printed circuit board positioned within the metal chassis, and a hybrid cavity mode antenna. The hybrid cavity mode antenna includes a conductive wall defining at least a portion of a cavity, wherein the cavity is further defined by one or more surfaces of the metal chassis and the printed circuit board, and an electrically-fed antenna configured to radiate a first radiofrequency signal in a first frequency range. The electrically-fed antenna is electrically driven from the printed circuit board of the communication device. The electrically-fed antenna is positioned within the cavity to drive the cavity to radiate a second radiofrequency signal in a second frequency range.

First claim

What is claimed is:

1. A communication device comprising:
a metal chassis;
a printed circuit board positioned within the metal chassis; and
a hybrid cavity mode antenna, the hybrid cavity mode antenna including:
a conductive wall defining at least a portion of a cavity, wherein the cavity is further defined by one or more surfaces of the metal chassis and the printed circuit board, wherein the metal chassis includes a metal surface that is substantially parallel to a surface of the printed circuit board, and the conductive wall and the cavity are positioned between the surface of the printed circuit board and the metal surface, and
an electrically-fed antenna configured to radiate a first radiofrequency signal in a first frequency range, wherein the electrically-fed antenna is electrically driven from the printed circuit board of the communication device, the electrically-fed antenna being positioned within the cavity to drive the cavity to radiate a second radiofrequency signal in a second frequency range.

2. The communication device of claim 1 , wherein the metal surface is a metal back surface of the metal chassis, and the metal chassis further includes at least a first metal edge surface and a second metal edge surface, the cavity being at least partially defined by the metal surface, the first metal edge surface, the second metal edge surface, the printed circuit board, and the conductive wall.

3. The communication device of claim 2 , wherein a tuning circuit connects the conductive wall to the first metal edge surface or the second metal edge surface.

4. The communication device of claim 2 , wherein the communication device includes a display and a bezel region between the display and the first metal edge surface, and the cavity includes a radiating slot positioned in the bezel region.

5. The communication device of claim 2 , wherein the conductive wall includes at least one grounding wall connector electrically connected to the first metal edge surface.

6. The communication device of claim 1 , wherein the metal surface is a metal back surface of the metal chassis, and the conductive wall is positioned between the printed circuit board and the metal back surface.

7. The communication device of claim 1 , wherein the metal surface is a metal back surface of the metal chassis, and the metal chassis further includes at least a first metal edge surface and a second metal edge surface, the conductive wall extending across the metal back surface from the first metal edge surface to the second metal edge surface.

8. The communication device of claim 7 , wherein the conductive wall electrically connects the metal back surface, the first metal edge surface, and the second metal edge surface.

9. The communication device of claim 1 , wherein the electrically-fed antenna is a first electrically-fed antenna, and further comprising:
a second electrically-fed antenna configured to radiate a third radiofrequency signal in the first frequency range, wherein the second electrically-fed antenna is electrically driven from the printed circuit board of the communication device, the second electrically-fed antenna being positioned within the cavity to drive the cavity to radiate the second radiofrequency signal in the second frequency range.

10. The communication device of claim 9 , wherein the second electrically-fed antenna is a loop antenna.

11. The communication device of claim 9 , wherein the second electrically-fed antenna is a monopole antenna.

12. The communication device of claim 9 , wherein the first electrically-fed antenna is positioned at one side of the cavity and the second electrically-fed antenna is positioned at an opposing side of the cavity.

13. The communication device of claim 9 , wherein the first electrically-fed antenna is a loop antenna.

14. The communication device of claim 1 , wherein the conductive wall includes a metal foam.

15. The communication device of claim 1 , wherein the metal surface is a metal back surface of the metal chassis and the metal chassis further includes at least a first metal edge surface, a second metal edge surface, and a third metal edge surface, the hybrid cavity mode antenna is a first hybrid cavity mode antenna with the conductive wall extending across the metal back surface from the first metal edge surface to the second metal edge surface, and the communication device further comprises:
a second hybrid cavity mode antenna including a second conductive wall extending across the metal back surface from the first metal edge surface to the third metal edge surface.

16. A hybrid cavity mode antenna comprising:
an electrically-conductive chassis for a communication device, the electrically-conductive chassis having an electrically-conductive surface, a first electrically-conductive edge surface, and a second electrically-conductive edge surface;
a printed circuit board positioned within the electrically-conductive chassis;
a conductive wall defining at least a portion of a cavity, wherein the cavity is further defined by the printed circuit board, the electrically-conductive surface, the first electrically-conductive edge surface, and the second electrically-conductive edge surface of the electrically-conductive chassis, wherein the electrically-conductive surface is substantially parallel to a surface of the printed circuit board, and the conductive wall and the cavity are positioned bet wen the surface of the printed circuit board and the electrically-conductive surface; and
an electrically-fed antenna configured to radiate a first radiofrequency signal in a first frequency range, wherein the electrically-fed antenna is positioned within the cavity to drive the cavity to radiate a second radiofrequency signal in a second frequency range.

17. The hybrid cavity mode antenna of claim 16 , wherein the electrically-fed antenna is a loop antenna.

18. The hybrid cavity mode antenna of claim 16 , wherein the conductive wall electrically contacts the electrically-conductive surface, the first electrically-conductive edge surface, and the second electrically-conductive edge surface.

19. The hybrid cavity mode antenna of claim 16 , wherein the conductive wall includes at least one grounding wall connector electrically connected to the first electrically-conductive edge surface.

20. The hybrid cavity mode antenna of claim 16 , wherein the conductive wall includes an electrically-conductive foam.

21. The communication device of claim 1 , wherein the electrically-fed antenna is positioned relative to the cavity to drive the cavity with the first radiofrequency signal to radiate the second radiofrequency signal.

22. The communication device of claim 1 , wherein the electrically-fed antenna is positioned relative to the cavity to electromagnetically couple with the cavity to radiate the second radiofrequency signal.

23. The communication device of claim 1 , wherein the cavity includes an opening between the printed circuit board and the metal chassis from which the second radiofrequency signal radiates.

24. The communication device of claim 1 , wherein a tuning circuit connects the conductive wall to the metal chassis.

Assignees

• Microsoft Technology Licensing Llc

Inventors

• Harper Marc

Classifications

• H01Q13/18 Primary

  the slot being backed by, or formed in boundary wall of, a resonant cavity (longitudinally slotted cylinder H01Q13/12 ){; Open cavity antennas} · CPC title

• H01Q7/00

  Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop · CPC title

• H01Q9/40

  Element having extended radiating surface · CPC title

• H05K1/0243

  Printed circuits associated with mounted high frequency components · CPC title

• H01Q1/2266 Primary

  disposed inside the computer · CPC title