Tyre sensor device
A sensor device adapted to be associated with a vehicle wheel includes a package enclosing at least one sensor and an electronic data processing apparatus and at least one antenna arranged on the package for at least one among the wireless transmission of data generated by the electronic apparatus and the wireless reception of data to be provided to the electronic apparatus. The at least one antenna is shaped to adhere to surfaces of the package.
1. A sensor device adapted to be associated with a vehicle wheel, comprising:
a package enclosing at least one sensor and an electronic data processing apparatus;
a transmit antenna arranged on the package for wireless transmission of data generated by the electronic apparatus; and
a receiving antenna arranged on the package for wireless reception of data to be provided to the electronic apparatus, said transmit antenna and said receiving antenna being shaped to adhere to surfaces of the package, wherein:
the transmit antenna is configured to transmit ultra wide band signals around a central frequency between 4.2 and 4.8 GHz, and
the receiving antenna is configured to receive narrowband signals around a central frequency between 2.4 and 2.5 GHz.
2. The sensor device of claim 1 , wherein:
the package has a substantially polyhedral shape, and
the transmit antenna and the receiving antenna are essentially arranged on opposite faces of the package.
3. The sensor device of claim 1 , wherein:
the transmit antenna is a folded dipole antenna, and
the receiving antenna is a strip monopole antenna.
4. The sensor device of claim 3 , wherein said transmit antenna comprises an upper radiator element and a lower radiator element longitudinally extending along a frontal face of the package.
5. The sensor device of claim 4 , wherein:
both the upper radiator element and the lower radiator element are folded around edges of the package so as to partially extend along lateral faces of the package; and
the upper radiator element and the lower radiator element are connected to each other by means of corresponding linking elements.
6. The sensor device of claim 4 , wherein the transmit antenna comprises first and second feeding terminals located on a top surface of the package and coupled to the electronic data processing apparatus, the upper radiator element comprising a first upper element connected to the first feeding terminal and a second upper element connected to the second feeding terminal.
7. The sensor device of claim 3 , wherein said receiving antenna is a strip antenna comprising a first section located on a lateral face of the package and a second section located on a back face of the package.
8. The sensor device of claim 7 , wherein the second section of the receiving antenna has rectangular shape, longitudinally extending on the back face of the package.
9. The sensor device of claim 8 , wherein the receiving antenna comprises third and fourth feeding terminals located on a top surface of the package and coupled to the electronic apparatus, the first section of the receiving antenna being connected to said third and fourth feeding terminals.
10. The sensor device of claim 1 , wherein the transmit antenna is configured to transmit ultra wide band signals with a bandwidth of 500 MHz or less.
11. The sensor device of claim 1 , wherein the receiving antenna is configured to receive narrowband signals with a bandwidth of 100 MHz or less.
12. The sensor device of claim 1 , wherein a shielding sheet is located inside the package for shielding transmit and receiving antennas from metallic parts located within the package.
13. The sensor device of claim 12 , wherein the shielding sheet comprises a magnetically loaded dielectric material.
14. The sensor device of claim 7 , wherein the transmit antenna comprises first and second feeding terminals located on a top surface of the package and coupled to the electronic apparatus, the upper radiator element comprising a first upper element connected to the first feeding terminal and a second upper element connected to the second feeding terminal, and wherein the transmit antenna is fed in a balanced way by the electronic apparatus through the first and second feeding terminals.
15. The sensor device of claim 8 , wherein the receiving antenna comprises third and fourth feeding terminals located on a top surface of the package and coupled to the electronic apparatus, the first section of the receiving antenna being connected to said third and fourth feeding terminals, and wherein the receiving antenna is fed in an unbalanced way by the electronic apparatus through the third and fourth feeding terminals.
16. A vehicle wheel comprising:
a rim; and
a tyre fitted on said rim,
said wheel further comprising at least one sensor device according to claim 1 , associated with at least one among said rim and said tyre.
17. A vehicle tyre comprising an inner surface and at least one sensor device according to claim 1 , placed on said inner surface.