Antenna with near-field radiation control

• US 7,961,154 B2
• Filed: 05/28/2009
• Issued: 06/14/2011
• Est. Priority Date: 12/12/2002
• Status: Expired due to Term

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Qi, Yihong, Jarmuszewski, Perry, Stevenson, Adam D.
• Primary Examiner(s): Phan; Tho G
• Application Number:
  US12/474,075
• Publication Number:
  US 20090231228A1
• Time in Patent Office: 747 Days
• Field of Search: 343/702, 343/803, 343/804, 343/815, 343/817, 343/818, 343/819, 343/833, 343/834, 343/795
• US Class Current: 343/803
• 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. A flexible substrate configured for use as an antenna in a wireless mobile communication device having a transmitter and receiver, the substrate having a first feeding point and a second feeding point for connection to the transmitter and the receiver, the substrate comprising:

a first conductor section connected to the first feeding point;

a parasitic element positioned adjacent the first conductor section and configured to affect characteristics of near-field radiation generated by the first conductor section; and

a second conductor section connected to the second feeding point and comprising a diffuser configured to diffuse near-field radiation into a plurality of directions.

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

3. The flexible substrate of claim 1 wherein the parasitic element includes a parasitic element conductor section that is substantially parallel to at least a portion of the first conductor section.

4. The flexible substrate of claim 1 wherein the parasitic element includes a parasitic element connection section that electrically couples the parasitic element to the first conductor section.

5. The flexible substrate of claim 4 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.

6. The flexible substrate of claim 5 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.

7. The flexible substrate of claim 6 wherein the parasitic element connection section attaches at one end of the parasitic element connection section.

8. The flexible substrate of claim 6 wherein the parasitic element connection section attaches substantially intermediate between the two ends of the parasitic element connection section.

9. The flexible substrate 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.

10. The flexible substrate of claim 9 wherein at least a portion of the first arm is substantially parallel to at least a portion of the second arm.

11. The flexible substrate of claim 10 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.

12. The flexible substrate of claim 9 wherein the parasitic element includes a parasitic element conductor section that is positioned between the first arm and the second arm.

13. The flexible substrate of claim 9 wherein the parasitic element includes a parasitic element conductor section that is positioned adjacent to the first arm.

14. The flexible substrate of claim 9 wherein the parasitic element includes a parasitic element conductor section that is positioned adjacent to the second arm.

15. The flexible substrate of claim 1 wherein the diffuser includes multiple conductor sections extending in different directions.

16. The flexible substrate of claim 15 wherein each of the multiple conductor sections comprises a substantially straight conductor.

17. The flexible substrate of claim 15 wherein the multiple conductor sections comprise curved conductors.

18. The flexible substrate 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.

19. The flexible substrate of claim 18 wherein the first arm comprises a diffuser and the second arm comprises a diffuser.

20. The flexible substrate of claim 19 wherein each of the diffusers includes multiple conductor sections extending in different directions.

21. The flexible substrate of claim 20 wherein each of the multiple conductor sections comprises a substantially straight conductor.

22. The flexible substrate of claim 19 wherein each of the diffusers comprises a curved conductor section.

23. The flexible substrate 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.