Multiple-element antenna with parasitic coupler

• US 20040075613A1
• Filed: 06/16/2003
• Published: 04/22/2004
• Est. Priority Date: 06/21/2002
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Research In Motion Limited (Blackberry Limited)
• Inventors: Qi, Yihong, Jarmuszewski, Perry, Man, Ying Tong
• Granted Patent: US 6,891,506 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 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 1/40 Radiating elements coated with or embedded in protective material
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating 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
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A multiple-element antenna for a multi-band wireless mobile communication device is provided. The multiple-element antenna includes a first antenna element, a second antenna element positioned adjacent the first antenna element, and a parasitic coupler positioned adjacent the first antenna element and the second antenna element. In one embodiment, the first and second antenna elements have respective first and second operating frequency bands, and electromagnetically couple with each other and with the parasitic coupler when the multiple-element antenna is operating in the first or second operating frequency band. The first and second antenna elements are configured to be connected to first and second transceivers in a wireless mobile communication device in an alternate embodiment.

Claims

1. A multiple-element antenna for a multi-band wireless mobile communication device, comprising:

a first antenna element having a first operating frequency band;

a second antenna element having a second operating frequency band and positioned adjacent the first antenna element; and

a parasitic coupler positioned adjacent the first antenna element and the second antenna element.

2. The multiple-element antenna of claim 1, wherein the first antenna element, the second antenna element, and the parasitic coupler are positioned on a single substrate.

3. The multiple-element antenna of claim 2, wherein the substrate is a flexible dielectric substrate.

4. The multiple-element antenna of claim 1, wherein:

the first antenna element comprises a feeding port and a top conductor section; and

a portion of the top conductor section is positioned adjacent the second antenna element and the parasitic coupler.

5. The multiple-element antenna of claim 1, wherein:

the first antenna element comprises a first port connected to a first conductor section, a second port connected to a second conductor section, and a third conductor section connected to the first conductor section and the second conductor section;

the first port and the second port are configured to connect the first antenna element to communications circuitry; and

a portion of the third conductor section is positioned adjacent the second antenna element and the parasitic coupler.

6. The multiple-element antenna of claim 5, wherein:

the first conductor section has an electrical length;

the electrical length of the first conductor section is selected to match impedance of the first antenna element to impedance of the communications circuitry;

the second conductor section has a second electrical length;

the third conductor section has a third electrical length; and

the second electrical length and the third electrical length are selected to tune the first antenna element to the first operating frequency band.

7. The multiple-element antenna of claim 1, wherein the second antenna element is an open folded dipole antenna.

8. The multiple-element antenna of claim 1, wherein:

the second antenna element includes a top load; and

dimensions of the top load are selected to tune the second antenna element to the second operating frequency.

9. The multiple-element antenna of claim 1, wherein the second antenna element includes a first conductor section and a second conductor section.

10. The multiple-element antenna of claim 9, wherein the first conductor section and the second conductor section define a gap.

11. The multiple-element antenna of claim 10, wherein a size of the gap is selected to set a gain of the second antenna element.

12. The multiple-element antenna of claim 9, wherein the parasitic coupler is positioned adjacent the first conductor section and the second conductor section.

13. The multiple-element antenna of claim 9, wherein the first antenna element is positioned adjacent one of the first conductor section and the second conductor section.

14. The multiple-element antenna of claim 13, wherein, when the first antenna element is operating in the first operating frequency band:

the first antenna element electromagnetically couples to the one of the first conductor section and the second conductor section; and

the first antenna element electromagnetically couples to the other of the first conductor section and the second conductor section through the parasitic coupler.

15. The multiple-element antenna of claim 1, wherein, when the second antenna element is operating in the second operating frequency band, the second antenna element electromagnetically couples to both the parasitic coupler and the first antenna element.

16. The multiple-element antenna of claim 1, further comprising a third antenna element having a third operating frequency band and positioned adjacent the parasitic coupler.

17. The multiple-element antenna of claim 16, wherein the third antenna element is positioned adjacent the second antenna element.

18. The multiple-element antenna of claim 16, wherein the third antenna element is positioned adjacent the first antenna element.

19. The multiple-element antenna of claim 1, wherein the parasitic coupler comprises a substantially straight conductor.

20. The multiple-element antenna of claim 1, wherein:

the parasitic coupler comprises a folded conductor having a first conductor section and a second conductor section;

the first conductor section is positioned adjacent the first antenna element; and

the second conductor section is positioned adjacent the second antenna element.

21. The multiple-element antenna of claim 1, wherein the parasitic coupler comprises a plurality of stacked parasitic elements.

22. The multiple-element antenna of claim 21, wherein the plurality of stacked parasitic elements comprises a plurality of juxtaposed conductors.

23. The multiple-element antenna of claim 21, wherein the plurality of stacked parasitic elements comprises a plurality of end-to-end stacked conductors.

24. The multiple-element antenna of claim 21, wherein the plurality of stacked parasitic elements comprises a plurality of offset stacked, partially overlapping conductors.

25. A multiple-element antenna for use with a wireless mobile communication device having a first transceiver and a second transceiver, comprising:

a single dielectric substrate;

a first antenna element on the single dielectric substrate and configured to be connected to the first transceiver;

a second antenna element on the single dielectric substrate and configured to be connected to the second transceiver; and

a parasitic coupler positioned on the single dielectric substrate adjacent the first antenna element and the second antenna element.

26. The multiple-element antenna of claim 25, wherein the multiple-element antenna is mounted on at least one inside surface of the wireless mobile communication device.

27. The multiple-element antenna of claim 25, wherein the wireless mobile communication device is a dual-band wireless mobile communication device, and wherein the first antenna element is tuned to a first operating frequency band and the second antenna element is tuned to a second operating frequency band.

28. The multiple-element antenna of claim 25, wherein the wireless mobile communication device is selected from the group consisting of:

a data communication device, a voice communication device, a dual-mode communication device, a mobile telephone having data communications functionality, a personal digital assistant (PDA) enabled for wireless communications, a wireless email communication device, and a wireless modem.

29. The multiple-element antenna of claim 25, wherein the first operating frequency band comprises a 900 MHz communication frequency band, and wherein the second operating frequency band includes both an 1800 MHz communication frequency band and a 1900 MHz communication frequency band.