Antenna for mobile communication terminals

• US 7,339,528 B2
• Filed: 12/21/2004
• Issued: 03/04/2008
• Est. Priority Date: 12/24/2003
• Status: Active Grant

• Current Assignee: RPX Corporation
• Original Assignee: Nokia Corporation
• Inventors: Williams, Stuart, Wang, Hanyang
• Primary Examiner(s): CHEN, SHIH CHAO
• Application Number:
  US11/019,412
• Publication Number:
  US 20050140554A1
• Time in Patent Office: 1,169 Days
• Field of Search: 343/700.MS, 343/702, 343/833, 343/844, 343/846, 343/848
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 19/005 Patch antenna using one or more coplanar parasitic elements
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/0414 in a stacked or folded configuration
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/0442 with particular tuning means

Abstract

An antenna including: a first substantially planar ground plate; a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate; a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate; two or more connectors for electrically connecting the second ground plate to ground; and one or more connectors for electrically connecting the first resonator to the second ground plate; wherein the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means.

Claims

1. An antenna comprising:

a first substantially planar ground plate;

a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate;

a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate;

two or more connectors for electrically connecting the second ground plate to the first ground plate; and

one or more connectors for electrically connecting the first resonator to the second ground plate;

wherein;

the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means;

the first resonator and the second ground plate each have similar dimensions;

wherein the first resonator is substantially aligned with the second ground plate; and

the second ground plate is positioned between the first ground plate and the first resonator.

2. An antenna according to claim 1 wherein one of the two or more connectors for electrically connecting the second ground plate to ground is a ground connection of the antenna feeding means.

3. An antenna according to claim 1 wherein at least one of the two or more connectors for electrically connecting the second ground plate to ground connects the second ground plate to the first ground plate.

4. An antenna according to claim 1 wherein the feeding means comprises an outer connector providing a ground connection and an inner connector providing a positive or negative voltage connection.

5. An antenna according to claim 4 wherein the first resonator is connected to the inner connector of the feeding means.

6. An antenna according to claim 1 further comprising a substantially planar parasitic resonator positioned adjacent the first resonator and in substantially the same plane as the first resonator.

7. An antenna according to claim 6 further comprising one or more connectors for connecting the parasitic resonator to the second ground plate.

8. An antenna according to claim 1 wherein the first resonator is shaped so as to comprise a dual-band or multi-band resonator.

9. An antenna according to claim 1 wherein the second ground plate is shaped so as to provide a further resonance in addition to resonances provided by other components of the antenna.

10. An antenna according to claim 9 wherein the second ground plate has one or more slots therein.

11. An antenna according to claim 9 wherein the antenna is configured to resonate in four frequency bands.

12. An antenna according to claim 10 wherein the antenna is configured to resonate in the USGSM850, EGSM900, DCS1800 and PCS1900 frequency bands.

13. A mobile communication terminal comprising an antenna, the antenna comprising:

a first substantially planar ground plate;

a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate;

a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate;

two or more connectors for electrically connecting the second ground plate to the first ground plate; and

one or more connectors for electrically connecting the first resonator to the second ground plate;

wherein;

the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means;

the first resonator and the second ground plate each have similar dimensions;

wherein the first resonator is substantially aligned with the second ground plate; and

the second around plate is positioned between the first ground plate and the first resonator.

14. A mobile communication terminal according to claim 13 wherein one of the two or more connectors for electrically connecting the second ground plate to ground is a ground connection of the antenna feeding means.

15. A mobile communication terminal according to claim 13 wherein at least one of the two or more connectors for electrically connecting the second ground plate to ground connects the second ground plate to the first ground plate.

16. A mobile communication terminal according to claim 13 wherein the feeding means comprises an outer connector providing a ground connection and an inner connector providing a positive or negative voltage connection.

17. A mobile communication terminal according to claim 16 wherein the first resonator is connected to the inner connector of the feeding means.

18. A mobile communication terminal according to claim 13 wherein the antenna further comprises a substantially planar parasitic resonator positioned adjacent the first resonator and in substantially the same plane as the first resonator.

19. A mobile communication terminal according to claim 18 wherein the antenna further comprises one or more connectors for connecting the parasitic resonator to the second ground plate.

20. A mobile communication terminal according to claim 13 wherein the first resonator is shaped so as to comprise a dual-band or multi-band resonator.

21. A mobile communication terminal according to claim 13 wherein the second ground plate is shaped so as to provide a further resonance in addition to resonances provided by other components of the antenna.

22. A mobile communication terminal according to claim 21 wherein the second ground plate has one or more slots therein.

23. A mobile communication terminal according to claim 21 wherein the antenna is configured to resonate in four frequency bands.

24. A mobile communication terminal according to claim 23 wherein the antenna is configured to resonate in the USGSM850, EGSM900, DCS1800 and PCS1900 frequency bands.

25. A mobile communication terminal according to claim 13 wherein a circuit board within the terminal comprises the first ground plate.

26. A mobile communication terminal according to claim 13 wherein a shielding can comprises the first ground plate.

27. A mobile communication terminal according to claim 13 wherein a metal frame of the terminal comprises the first ground plate.

28. A mobile communication terminal according to claim 13 wherein a cover of the terminal substantially comprises metal.

29. An antenna for use in a mobile communications terminal having a first substantially planar ground plate, the antenna comprising:

a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate;

a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate;

two or more connectors for electrically connecting the second ground plate to the first ground plate; and

one or more connectors for electrically connecting the first resonator to the second ground plate;

wherein;

the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means;

the first resonator and the second ground plate each have similar dimensions;

wherein the first resonator is substantially aligned with the second ground plate; and

the second ground plate is positioned between the first around plate and the first resonator.

30. An antenna comprising:

a first substantially planar ground plate;

a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate;

a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate;

two or more connectors for electrically connecting the second ground plate to ground; and

one or more connectors for electrically connecting the first resonator to the second ground plate;

wherein;

the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means;

wherein the second ground plate is positioned between the first ground plate and the first resonator; and

the first resonator is substantially aligned with the second ground plate.

31. A mobile communication terminal comprising an antenna, the antenna comprising:

a first substantially planar ground plate;

a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate;

a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate;

two or more connectors for electrically connecting the second ground plate to ground; and

one or more connectors for electrically connecting the first resonator to the second ground plate;

wherein;

the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means;

wherein the second ground plate is positioned between the first ground plate and the first resonator; and

the first resonator is substantially aligned with the second ground plate.