APPARATUS COMPRISING AN ANTENNA ELEMENT AND A METAL PART

• US 20100007563A1
• Filed: 12/22/2006
• Published: 01/14/2010
• Est. Priority Date: 12/22/2006
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Technologies Oy (Nokia Corporation)
• Inventors: Varjonen, Eero
• Granted Patent: US 9,246,212 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 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 1/52 Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure absorbing means H01Q17/00
• CPC Class Codes: Y10T 29/49018 with other electrical component

Abstract

An apparatus including an antenna element; a metal part; a ground; and a filter connected between the metal part and the ground that has a frequency dependent impedance.

Claims

1. An apparatus comprising:

an antenna element;

a metal part that is not an antenna element;

a ground; and

a filter connected between the metal part and the ground that has a frequency dependent impedance.

2. An apparatus as claimed in claim 1, wherein the filter provides for a frequency dependent current path between the ground and the metal part.

3. An apparatus as claimed in claim 1, wherein the filter comprises a parallel LC circuit.

4. An apparatus as claimed in claim 3, wherein the parallel LC circuit comprises discrete components.

5. An apparatus as claimed in claim 1, wherein the filter is a band-stop filter having a very high impedance at a particular frequency band.

6. An apparatus as claimed in claim 1, comprising multiple conductive connections between the metal part and the ground, wherein one of the multiple conductive connections incorporates the filter.

7. An apparatus as claimed in claim 1, comprising multiple conductive connections between the metal part and the ground, wherein a plurality of the multiple conductive connections incorporate a filter.

8. An apparatus as claimed in claim 6, wherein the connection nearest the antenna element comprises the filter.

9. An apparatus as claimed in claim 6, wherein the connections are provided by connectors that connect the metal part to a grounded printed wiring board.

10. An apparatus as claimed in claim 9, wherein the connectors are screws.

11. An apparatus as claimed in claim 1, wherein the antenna element is a monopole antenna element.

12. An apparatus as claimed in claim 1, wherein the antenna element is positioned adjacent a ground plane that provides the ground.

14. An apparatus as claimed in claim 1, wherein the antenna element is a multi band antenna element having a first frequency band of operation and a second, different, frequency band of operation.

15. An apparatus as claimed in claim 14, wherein the filter is tuned to the second frequency band.

16. An apparatus as claimed in claim 14, wherein the filter is a band-stop filter having a very high impedance at the second frequency band.

17. An apparatus as claimed in claim 1, wherein the metal part is not an antenna element.

18. An apparatus as claimed in claim 1, wherein the metal part is a supporting chassis.

19. An apparatus as claimed in claim 1 embodied as a module for a radio communication device or embodied as a radio communication device.

20. A personal electronic device incorporating the apparatus as claimed in claim 1.

13. (canceled)

21. A method of assembling an apparatus comprising a radiating antenna element, the method comprising:

electrically interconnecting a metal part that is not an antenna element and is separate to the antenna element, and a ground via a filter that has a frequency dependent impedance.