RF radiation redirection away from portable communication device user

• US 8,214,003 B2
• Filed: 03/15/2010
• Issued: 07/03/2012
• Est. Priority Date: 03/13/2009
• Status: Active Grant

• Current Assignee: Penumbra Brands, Inc.
• Original Assignee: Pong Research Corporation
• Inventors: Wong, Alfred Y., Moreno, Robert, Shields, Karl Richard, Wang, Rong
• Primary Examiner(s): TRINH, TAN H
• Application Number:
  US12/724,290
• Publication Number:
  US 20100234081A1
• Time in Patent Office: 841 Days
• Field of Search: 455/575, 455/575.5, 455/575.1, 455/90.1, 455/41.2, 455/75, 455/558, 455/66.1, 455/550.1, 455/422, 455/450, 455/73, 455/77, 455/101, 455/289, 455/280, 455/90, 455/128, 455/90.3, 455/575.7, 455/575.8, 455/562.1, 455/63.1, 455/575.6, 343/702, 343/749, 343/841, 343/700, 343/846
• US Class Current: 455/575.5
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/245 with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
• CPC Class Codes: H01Q 19/005 Patch antenna using one or more coplanar parasitic elements
• CPC Class Codes: H01Q 19/28 using a secondary device in the form of two or more substantially straight conductive elements log- periodic antennas H01Q11/10; constituting a reflecting surface H01Q19/10
• CPC Class Codes: H01Q 7/00 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 Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H04B 1/3888 Arrangements for carrying or protecting transceivers

Abstract

A case for a wireless device includes a number of RF coupling elements mounted in the case and configured such that RF radiation is coupled from an internal antenna of the wireless device out of the device to a first RF coupling element, and from the first RF coupling element to a RF redirector coupling element that redirects the RF radiation in a direction outward from said wireless device that is opposite to a user side of the wireless device. A corrugated metallic shield is optionally provided on an opposite side of the case, facing a user of the device.

Claims

1. A case for a wireless device, comprising a plurality of RF coupling elements mounted in said case and configured such that RF radiation is coupled from an internal antenna of said wireless device out of said device to a first of said RF coupling elements, and from said first RF coupling element to a RF redirector coupling element that redirects said RF radiation in a direction outward from said wireless device that is opposite to a user side of said wireless device, said plurality of RF coupling elements is configured as a ladder and plate RF redirecting coupler.

2. A case for a wireless device as set forth in claim 1, wherein at least one of said RF coupling elements is configured as a loop.

3. A case for a wireless device as set forth in claim 1, wherein at least one of said RF coupling elements is configured as a horizontal strip.

4. A case for a wireless device as set forth in claim 3, wherein at least one of said RF coupling elements is configured as a vertical strip that functions in combination with a horizontal strip.

5. A case for a wireless device as set forth in claim 4, wherein said vertical strip is mounted in a layer above a horizontal strip.

6. A case for a wireless device as set forth in claim 1, wherein at least one of said RF coupling elements is configured as a U-shaped element.

7. A case for a wireless device as set forth in claim 1, wherein at least one of said RF coupling elements is configured as a plate.

8. A case for a wireless device as set forth in claim 7, wherein said plate is rectangular in shape.

9. A case for a wireless device as set forth in claim 1, wherein said first RF coupling element is configured as a loop and said RF redirector coupling element is configured as a loop.

10. A case for a wireless device as set forth in claim 9, wherein said first RF coupling element loop is positioned over a side and bottom of said wireless device so as to wrap around said internal antenna.

11. A case for a wireless device as set forth in claim 1, further comprising a metallic shield mounted in said case on a side facing a user of said device.

12. A case for a wireless device as set forth in claim 11, further comprising a radiation absorbing material mounted adjacent to said metallic shield between said shield and said user.

13. A case for a wireless device as set forth in claim 11, further comprising a strip of dielectric material mounted between said internal antenna and said metallic shield.

14. A case for a wireless device as set forth in claim 1, wherein said metallic shield is corrugated.

15. A case for a wireless device as set forth in claim 1, wherein a size of corrugations of said metallic shield is smaller than wavelengths of microwave frequencies transmitted from the wireless device.

16. A case for a wireless device as set forth in claim 1, wherein said first RF coupling element comprises a metallic sheet having a slot formed therein of a length and width tuned to 1/4 of the wavelength of RF transmission from said internal antenna.

17. A wireless device, comprising:

a plurality of RF coupling elements mounted in said wireless device and configured such that RF radiation is coupled from an internal antenna of said wireless device out of said device to a first of said RF coupling elements, and from said first RF coupling element to a RF redirector coupling element that redirects said RF radiation in a direction outward from said wireless device that is opposite to a user side of said wireless device, said plurality of RF coupling elements is configured as a ladder and plate RF redirecting coupler.

18. A wireless device as set forth in claim 17, further comprising a metallic shield mounted in said case on a side facing a user of said device.

19. A wireless device as set forth in claim 18, wherein said metallic shield is corrugated.

20. A wireless device as set forth in claim 19, wherein a size of corrugations of said metallic shield is smaller than wavelengths of microwave frequencies transmitted from the wireless device.

21. A wireless device as set forth in claim 18, further comprising a radiation absorbing material mounted adjacent to said metallic shield between said shield and said user.

22. A wireless device as set forth in claim 18, further comprising a strip of dielectric material mounted between said internal antenna and said metallic shield.