Keys and keylines used for antenna purposes
An apparatus has a data input device arrangement and an electrical circuit. The data input device arrangement includes at least one user input key and at least two keylines configured to provide a data input to the apparatus. The electrical circuit has at least a first electrically conductive component configured to decouple the data input device arrangement at a predetermined radio frequency band to provide an antenna. In an embodiment the predetermined frequency is an operational frequency of the provided antenna. In various embodiments when the data input device is decoupled one of the keylines provides an antenna radiator component, and in another it provides an antenna parasitic short to ground. In various embodiments the first electrically conductive component exhibits a high impedance at the predetermined radio frequency band, and in another it is a notch filter which passes the predetermined radio frequency band.
1. An apparatus comprising:
a data input device arrangement, the data input device arrangement comprising at least one user input key and at least two keylines configured to provide a data input to the apparatus, and
an electrical circuit,
wherein the electrical circuit comprises at least a first electrically conductive component configured to decouple the data input device arrangement at a predetermined radio frequency band to cause at least one of the keylines to operate as an antenna radiating element in the predetermined radio frequency band, and
wherein one of the keylines comprise an antenna feed.
2. The apparatus according to claim 1 , in which the apparatus comprises a portable electronic device.
3. The apparatus according to claim 1 , in which the first electrically conductive component comprises a cellular decoupling element and a non-cellular decoupling element serially disposed along at least one of the at least two keylines, wherein the cellular and the non-cellular decoupling elements are configured to be coupled to a ground to provide a direct current ground for the at least one user input key and provide a radio frequency ground for the decoupling elements.
4. The apparatus according to claim 1 , in which the at least one of the keylines operate as a parasitic antenna element further comprising the antenna feed is configured to be coupled to ground when the first electrically conductive component decouples the data input device arrangement.
5. The apparatus according to claim 1 , in which the first electrically conductive component exhibits a high impedance at the predetermined radio frequency band.
6. The apparatus according to claim 1 , in which the first electrically conductive component comprises a notch filter which passes the predetermined radio frequency band.
7. The apparatus according to claim 6 , in which the notch filter is disposed along a first one of the at least two keylines and a second one of the at least two keylines extends from one of the at least one user input key.
8. The apparatus according to claim 6 , in which a first one of the at least two keylines extends from one of the at least one user key, a second one of the at least two keylines extends from the first keyline, and the notch filter is disposed along the first keyline between the at least one user key and the second keyline.
9. The apparatus according to claim 1 , in which the electrical circuit comprises a decoupling coil disposed along one of the at least two keylines in series with the first electrically conductive component.
10. The apparatus according to claim 9 , in which the electrical circuit comprises a cellular decoupling coil and a non-cellular decoupling coil in series with one another along the said one of the at least two keylines.
11. The apparatus according to claim 1 , in which the antenna feed is configured to be coupled to radio frequency circuitry.
12. The apparatus according to claim 1 , in which the antenna feed is configured to be coupled to radio frequency circuitry and ground.
13. A method comprising:
providing a data input device arrangement, the data input device arrangement comprising at least one user input key and at least two keylines configured to provide a data input to an apparatus, and
adapting the data input device arrangement with an electrical circuit comprising at least a first electrically conductive component that is configured to decouple the data input device arrangement at a predetermined radio frequency band to cause at least one of the keylines to operate as an antenna radiating element in the predetermined radio frequency band, wherein at least one of the keylines comprise an antenna feed.
14. The method according to claim 13 , in which the apparatus comprises a portable electronic device.
15. The method according to claim 13 , in which the first electrically conductive component comprises a cellular decoupling element and a non-cellular decoupling element serially disposed along at least one of the at least two keylines, wherein the cellular and the non-cellular decoupling elements are configured to be coupled to a ground to provide a direct current ground for the at least one user input key and provide a radio frequency ground for the decoupling elements.
16. The method according to claim 13 , in which the at least one of the keylines operate as a parasitic antenna element further comprising the antenna feed is configured to be coupled to ground when the first electrically conductive component decouples the data input device.
17. The method according to claim 13 , in which the first electrically conductive component exhibits a high impedance at the predetermined radio frequency band.
18. The method according to claim 13 , in which the first electrically conductive component comprises a notch filter which passes the predetermined radio frequency band.
19. The method according to claim 18 , in which adapting the data input device arrangement comprises disposing the notch filter along a first one of the at least two keylines, wherein a second one of the at least two keylines extends from one of the at least one user input key.
20. The method according to claim 18 , in which a first one of the at least two keylines extends from the key, and a second one of the at least two keylines extends from the first keyline, and in which adapting the data input device arrangement comprises disposing the notch filter along the first keyline between the key and the second keyline.
21. The method according to claim 13 , and in which adapting the data input device arrangement comprises disposing a decoupling coil along one of the keylines in series with the first electrically conductive component.
22. The method according to claim 21 , in which the electrical circuit comprises a cellular decoupling coil and a non-cellular decoupling coil in series with one another along the said one of the keylines.
23. An apparatus comprising:
at least one processor; and
at least one memory including computer program code, where the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to at least:
provide, with a data input device arrangement comprising at least one user input key and at least two keylines, a data input to the apparatus, and
decouple, with at least a first electrically conductive component, the data input device arrangement at a predetermined radio frequency band causing at least one of the keylines to operate as an antenna in the predetermined radio frequency band, wherein at least one of the keylines comprise an antenna feed.