ANTENNA WITH NEAR FIELD DEFLECTOR

• US 20090046022A1
• Filed: 08/17/2007
• Published: 02/19/2009
• Est. Priority Date: 08/17/2007
• Status: Active Grant

• Current Assignee: Kyocera AVX Components Corporation (Kyocera Corporation)
• Original Assignee: Ethertronics, Inc. (Kyocera Corporation)
• Inventors: Desclos, Laurent, Rowson, Sebastian
• Granted Patent: US 7,994,986 B2
• Time in Patent Office: Days
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/362 for broadside radiating helical antennas

Abstract

A mobile communication device having primary resonator coupled to a near field deflector. The near field deflector forms a false edge for near field deflection wherein the primary resonator couples with the false edge instead of to metallic portions of the device or the user.

Claims

1. A multi-frequency communications device having a speaker, comprising;

a primary resonator, the primary resonator for enabling at least one frequency at which the device operates;

a near field deflector which generates a null associated with the position of the speaker;

wherein the near field deflector forms a false edge substantially preventing coupling of the primary resonator to the speaker.

2. The multi-frequency communications device of claim 1, wherein the primary resonator is a low frequency antenna.

3. The multi-frequency communications device of claim 2, wherein the primary resonator is a coil antenna.

4. The multi-frequency communications device of claim 2, wherein the primary resonator is a dipole antenna.

5. The multi-frequency communications device of claim 1, wherein the near field deflector is a secondary resonator.

6. The multi-frequency communications device of claim 5, wherein the secondary resonator is capacitively coupled to the primary resonator.

7. The multi-frequency communications device of claim 1, further comprising a printed circuit board on which the speaker and primary resonator are disposed, wherein the near field deflector comprise at least one slot in the printed circuit board, the at least one slot being positioned between the primary resonator and speaker.

8. The multi-frequency communications device of claim 1, further comprising a housing having the primary resonator, near field deflector, and the speaker disposed therein.

9. The multi-frequency communications device of claim 1, further comprising a housing having the primary resonator, and the speaker disposed therein, wherein the near field deflector is disposed outside of the housing.

10. A mobile communications device, comprising:

a housing having a speaker disposed in a first area;

a primary resonator disposed at least partially in a second area of the housing;

a secondary resonator parasitically coupled to the first resonator and positioned substantially in the first area;

wherein a null is created in the first area forming a false edge for preventing coupling of the primary resonator with the speaker.

11. The mobile communications device of claim 10, wherein the secondary resonator is positioned outside of the housing.

12. The mobile communications device of claim 11, wherein the secondary resonator is not grounded.

13. The mobile communications device of claim 12, wherein the secondary resonator is adhered to an outer surface of the housing.

14. The mobile communications device of claim 10, wherein the secondary resonator is disposed in the housing.

15. The mobile communications device of claim 10, wherein the secondary resonator is grounded.

16. A mobile communications device, comprising:

a housing

a printed circuit board disposed inside the housing;

a speaker disposed on the printed circuit board;

a primary resonator disposed on the printed circuit board;

slots in the printed circuit board in an area between the speaker and primary resonator;

wherein the slots create a false edge for preventing coupling of the primary resonator with the speaker.

17. A method for creating a false edge in the near field of a primary resonator to prevent coupling between the primary resonator and another item, comprising:

providing the primary resonator which exhibits a radiation pattern;

providing a near field deflector which creates a false edge;

coupling the primary resonator to the false edge created by the near field deflector;

positioning the near field deflector to create the false edge in an area between the item and the primary resonator to prevents the coupling of the primary resonator to the item.

18. The method of claim 17, wherein the item is an internal component of a mobile communications device.

19. The method of claim 17, wherein the item is located on a user of a mobile communications device.

20. The method of claim 17, wherein the near field deflector is capacitively coupled to the primary resonator.

21. An antenna arrangement for a wireless device, comprising;

a primary antenna component disposed on a substrate; and

a field altering element adapted to alter a field generated by the primary antenna component, thereby producing an altered field,

wherein a null region is created by the field altering element.

22. The antenna arrangement of claim 21, wherein the field altering element is a loop element.

23. The antenna arrangement of claim 22, wherein the loop element is positioned substantially parallel to the primary antenna component.

24. The antenna arrangement of claim 22, wherein the loop element is positioned substantially perpendicular to the primary antenna component.

25. The antenna arrangement of claim 22, wherein the loop element is positioned on a side of the substrate upon which the primary antenna component is disposed.

26. The antenna arrangement of claim 22, wherein the loop element is positioned on a side of the substrate opposite that upon which the primary antenna component is disposed.

27. The antenna arrangement of claim 21, wherein the field altering element is a planar element positioned substantially parallel to the substrate and substantially above the primary antenna component.

28. The antenna arrangement of claim 27, wherein the planar element has a dual loop configuration.

29. A wireless device, comprising:

a housing having a speaker disposed in a first area;

a primary antenna component disposed on a substrate; and

a field altering element adapted to alter a field generated by the primary antenna component, thereby producing an altered field,

wherein a null region is created by the field altering element in the first area.

30. The antenna arrangement of claim 29, wherein the field altering element is a loop element.

31. The antenna arrangement of claim 30, wherein the loop element is positioned substantially parallel to the primary antenna component.

32. The antenna arrangement of claim 30, wherein the loop element is positioned substantially perpendicular to the primary antenna component.

33. The antenna arrangement of claim 30, wherein the loop element is positioned on a side of the substrate upon which the primary antenna component is disposed.

34. The antenna arrangement of claim 30, wherein the loop element is positioned on a side of the substrate opposite that upon which the primary antenna component is disposed.

35. The antenna arrangement of claim 29, wherein the field altering element is a planar element positioned substantially parallel to the substrate and substantially above the primary antenna component.

36. The antenna arrangement of claim 35, wherein the planar element has a dual loop configuration.