Antenna with near-field radiation control

• US 8,125,397 B2
• Filed: 06/09/2011
• Issued: 02/28/2012
• Est. Priority Date: 12/12/2002
• Status: Expired due to Fees

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Research In Motion Limited (Blackberry Limited)
• Inventors: Qi, Yihong, Jarmuszewski, Perry, Stevenson, Adam D.
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US13/156,728
• Publication Number:
  US 20110248896A1
• Time in Patent Office: 264 Days
• Field of Search: 343/702, 343/793, 343/795, 343/803, 343/806, 343/815, 343/817, 343/818, 343/819, 343/833, 343/834
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 19/005 Patch antenna using one or more coplanar parasitic elements
• CPC Class Codes: H01Q 9/26 with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength resonant loop antennas H01Q7/00

Abstract

An antenna and a wireless mobile communication device incorporating the antenna are provided. The antenna includes a first conductor section electrically coupled to a first feeding point, a second conductor section electrically coupled to a second feeding point, and a near-field radiation control structure adapted to control characteristics of near-field radiation generated by the antenna. Near-field radiation control structures include a parasitic element positioned adjacent the first conductor section and configured to control characteristics of near-field radiation generated by the first conductor section, and a diffuser in the second conductor section configured to diffuse near-field radiation generated by the second conductor section into a plurality of directions.

Claims

1. An antenna for use in a wireless mobile communication device having a transmitter and receiver, the antenna having a first feeding point and a second feeding point for connection to the transmitter and the receiver, the antenna comprising:

a first conductor section connected to the first feeding point;

a second conductor section connected to the second feeding point;

a parasitic element positioned adjacent to a linear section of the first conductor section; and

a diffuser coupled between linear sections of the second conductor section.

2. The antenna of claim 1 wherein the parasitic element includes a sawtooth-shaped conductor section.

3. The antenna of claim 1 wherein the parasitic element is positioned substantially parallel to the linear section of the first conductor section.

4. The antenna of claim 1 wherein the first conductor section has a first arm and a second arm, and wherein the parasitic element is positioned substantially parallel to linear sections of both of the first arm and the second arm.

5. The antenna of claim 1 wherein the parasitic element includes a parasitic element connection section that electrically couples the parasitic element to the first conductor section.

6. The antenna of claim 5 wherein the parasitic element connection section is substantially perpendicular to a portion of the first conductor section at which the parasitic element connection section attaches.

7. The antenna of claim 6 wherein the parasitic element includes a parasitic element conductor section that is substantially parallel to the portion of the first conductor section at which the parasitic element connection section attaches.

8. The antenna of claim 7 wherein the parasitic element connection section attaches at one end of the parasitic element connection section.

9. The antenna of claim 7 wherein the parasitic element connection section attaches substantially intermediate between the two ends of the parasitic element connection section.

10. The antenna of claim 1 wherein the first conductor section includes a first arm electrically coupled to the first feeding point and a second arm electrically coupled to the first arm.

11. The antenna of claim 10 wherein at least a portion of the first arm is substantially parallel to at least a portion of the second arm.

12. The antenna of claim 11 wherein the parasitic element includes a parasitic element conductor section that is substantially parallel to the portion of the first arm that is substantially parallel to a portion of the second arm.

13. The antenna of claim 10 wherein the parasitic element includes a parasitic element conductor section that is positioned between the first arm and the second arm.

14. The antenna of claim 10 wherein the parasitic element includes a parasitic element conductor section that is positioned adjacent to the first arm.

15. The antenna of claim 10 wherein the parasitic element includes a parasitic element conductor section that is positioned adjacent to the second arm.

16. The antenna of claim 1 wherein the diffuser comprises a first diffuser section and a second diffuser section.

17. The antenna of claim 16 wherein the first and second diffuser sections have a triangular shape.

18. The antenna of claim 16 wherein the first and second diffuser sections have a curved shape.

19. The antenna of claim 1 wherein the second conductor section includes a first arm electrically coupled to the second feeding point and a second arm electrically coupled to the first arm.

20. The antenna of claim 19 wherein the first arm is electrically coupled to a first diffuser section and the second arm is electrically coupled to a second diffuser section.

21. The antenna of claim 20 wherein the first and second diffuser sections have a triangular shape.

22. The antenna of claim 20 wherein the first and second diffuser sections have a curved shape.

23. The antenna of claim 1 wherein the first conductor section and the second conductor section are positioned to define a gap there between and form an open folded dipole antenna.

24. An antenna for use in a wireless mobile communication device having a transmitter and receiver, the antenna having a first feeding point and a second feeding point for connection to the transmitter and the receiver, the antenna comprising:

a first conductor section connected to the first feeding point;

a second conductor section connected to the second feeding point; and

a diffuser coupled between linear sections of the second conductor section.

25. The antenna of claim 24 wherein the diffuser comprises a first diffuser section and a second diffuser section.

26. The antenna of claim 25 wherein the first and second diffuser sections have a triangular shape.

27. The antenna of claim 25 wherein the first and second diffuser sections have a curved shape.

28. The antenna of claim 24 wherein the second conductor section includes a first arm electrically coupled to the second feeding point and a second arm electrically coupled to the first arm.

29. The antenna of claim 28 wherein the first arm is electrically coupled to a first diffuser section and the second arm is electrically coupled to a second diffuser section.

30. The antenna of claim 29 wherein the first and second diffuser sections have a triangular shape.

31. The antenna of claim 29 wherein the first and second diffuser sections have a curved shape.

32. The antenna of claim 24 wherein the first conductor section and the second conductor section are positioned to define a gap there between and form an open folded dipole antenna.