Mobile Communication Device with Improved Antenna Performance

• US 20130120219A1
• Filed: 04/26/2010
• Published: 05/16/2013
• Est. Priority Date: 04/26/2010
• Status: Active Grant

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Epcos AG (TDK Corporation)
• Inventors: Tikka, Pasi, Lehtonen, Pasi, Ella, Juha
• Granted Patent: US 9,035,832 B2
• Time in Patent Office: Days
• US Class Current: 343/893
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 21/00 Antenna arrays or systems arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system H01Q3/00
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/0825 with main and with auxiliary or diversity antennas

Abstract

Mobile communication devices with improved antenna performance are provided. A mobile communication device includes a first antenna, a ground plane, and a diversity antenna. In a mode of operation which is not a multi-antenna transmission mode, the diversity antenna is electrically coupled to the ground plane. The diversity antenna increases the electrical length of the ground plane and enhances the antenna performance of the radiating assembly of the first antenna in combination with the ground antenna and the diversity antenna.

Claims

1-9. -9. (canceled)

10. A mobile communication device comprising:

a ground plane;

a first antenna that can couple electromagnetically to the ground plane during operation; and

a diversity antenna that can couple electromagnetically to the ground plane during operation wherein during operation of the first antenna, the coupling of the diversity antenna to the ground plane enhances performance of the first antenna.

11. The device of claim 10, wherein coupling the diversity antenna to the ground plane enhances the bandwidth of the first antenna by a factor of at least 1.1.

12. The device of claim 10, wherein coupling the diversity antenna to the ground plane enhances the transmission coefficient of the first antenna by at least 3 dB.

13. The device of claim 12, wherein the first antenna and the diversity antenna are specified for a LTE communication device.

14. The device of claim 10, wherein the first antenna and the diversity antenna are arranged on opposite ends of the ground plane.

15. The device of claim 10, further comprising a printed wiring board wherein the ground plane is arranged on the printed wiring board.

16. The device of claim 10, wherein coupling the diversity antenna to the ground plane enhances the performance of the first antenna in a GSM operation mode.

17. The device of claim 10, wherein coupling the diversity antenna to the ground plane enhances the performance of the WCDMA operation mode.

18. The device of claim 10, wherein coupling the diversity antenna to the ground plane enhances the performance of the LTE TDD operation mode.

19. The device of claim 10, wherein the diversity antenna is terminated with a band pass filter.

20. The device of claim 10, wherein the diversity antenna is terminated with a predefined load impedance.

21. The device of claim 10, further comprising a switch that provides an electrical connection between the diversity antenna on one side and a band pass filter or a predefined load impedance on the other side.