Notch filters in planar inverted F antennas for placing a plurality of antennas in close proximity

• US 20040204189A1
• Filed: 04/04/2002
• Published: 10/14/2004
• Est. Priority Date: 04/04/2002
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Guetre, Eric, Wonterghem, Jari Van
• Granted Patent: US 6,957,080 B2
• Time in Patent Office: Days
• US Class Current: 455/575.1
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/525 between emitting and receiving antennas
• 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

Mobile terminals having a plurality of planar inverted-F antennas placed in close proximity of each other and methods of fabricating and using such mobile terminals are provided. Generally, planar inverted-F antennas, such as dual band CDMA, GPS, and Bluetooth antennas, cannot be placed in close proximity of each other without having interference. Accordingly, notch filters are provided in a dual band CDMA antenna to mitigate the interference and to facilitate isolation between the antennas.

Claims

1. A mobile terminal, comprising:

a housing;

a plurality of antennas located within the housing, the plurality of antennas being located in close proximity of each other; and

a notch filter located in at least one of the plurality of antennas.

2. The mobile terminal of claim 1, the plurality of antennas being planar inverted-F antennas.

3. The mobile terminal of claim 1, the plurality of antennas being inverted-F antennas.

4. The mobile terminal of claim 1, the plurality of antennas comprising a dual band Code Division Multiple Access (CDMA) antenna and a Global Positioning System (GPS) antenna.

5. The mobile terminal of claim 4, the plurality of antennas further comprising a Bluetooth antenna.

6. The mobile terminal of claim 5, the CDMA antenna having a GPS notch filter and a Bluetooth notch filter.

7. The mobile terminal of claim 5, the GPS antenna having a Bluetooth notch filter.

8. The mobile terminal of claim 4, the CDMA antenna having a GPS notch filter.

9. The mobile terminal of claim 1 being a wireless telephone.

10. The mobile terminal of claim 1 being a portable computing device.

11. A mobile terminal, comprising:

a housing; and

a dual band antenna and a Global Positioning System (GPS) antenna located within the housing in close proximity of each other, the dual band antenna having a GPS notch filter therein.

12. The mobile terminal of claim 11, the dual band antenna being a Code Division Multiple Access (CDMA) antenna.

13. The mobile terminal of claim 11, the dual band antenna being a Global System for Mobile Communications (GSM) antenna.

14. The mobile terminal of claim 11, the mobile terminal transmitting voice and location data to a Public Safety Answering Point (PSAP) upon placing a 911 call.

15. The mobile terminal of claim 11, the mobile terminal being employed in an Assisted-GPS (A-GPS) technique.

16. A method for placing a plurality of antennas in close proximity on a mobile terminal, comprising:

placing a plurality of antennas at an optimal position on a mobile terminal, at least one of the plurality of antennas having a notch filter to mitigate interference between the antennas.

17. The method of claim 16, the plurality of antennas comprising a dual band Code Division Multiple Access (CDMA) antenna and a Global Positioning System (GPS) antenna.

18. The method of claim 17, the plurality of antennas further comprising a Bluetooth antenna.

19. The method of claim 18, the dual band CDMA antenna having a GPS notch filter and a Bluetooth notch filter to facilitate isolation between the dual band CDMA antenna, the GPS antenna, and the Bluetooth antenna.

20. The method of claim 18, the GPS antenna having a Bluetooth notch filter to facilitate isolation between the GPS antenna and the Bluetooth antenna.

21. The method of claim 17, the dual band CDMA antenna having a GPS notch filter to facilitate isolation between the dual band CDMA antenna and the GPS antenna.

22. A method for determining a location of a mobile terminal, comprising:

employing a mobile terminal, the mobile terminal having a plurality of antennas located in close proximity of each other, at least one of the plurality of antennas having a notch filter to mitigate interference between the plurality of antennas;

determining location data for the mobile terminal from Global Positioning System (GPS) signals;

placing a 911 call from the mobile terminal; and

transmitting voice and location data from the mobile terminal to a 911 dispatcher.

23. The method of claim 22, the plurality of antennas being a dual band Code Division Multiple Access (CDMA) antenna and a GPS antenna.

24. The method of claim 22, further comprising, employing a GPS reference receiver to gather navigation messages and differential correction data for GPS satellites and to transmit the messages and data to a location server.

25. The method of claim 23, the location server providing aiding data to the mobile terminal on demand.

26. The method of claim 24, the location server having access to a terrain elevation database, the terrain elevation database providing extra range measurement.

27. A mobile terminal, comprising:

a plurality of antennas placed in close proximity of each other on the mobile terminal; and

means for mitigating interference between the plurality of antennas.