SIGNAL TRANSMISSION DEVICES AND PORTABLE RADIO COMMUNICATION DEVICES COMPRISING SUCH SIGNAL TRANSMISSION DEVICES

1 . A signal transmission device comprising a foldable conductive trace carrier having a first side, a second side, and a first part having a first lateral section, a second lateral section, and a midsection between the first and second lateral sections, wherein:

the midsection includes a first central primary conductive trace on the first side of the carrier and first and second secondary conductive traces respectively on each side of the primary conductive trace on the first side of the carrier;

the first part of the carrier is foldable for folding the first lateral section over the first side of the midsection and the second lateral section under the second, opposite side of the midsection to thereby cover the midsection; and

the first lateral section includes a first solid area of conductive material and the second lateral section includes a second solid area of conductive material for forming a shielded conductor when the first part of the carrier is folded.

2 . The signal transmission device of claim 1 , wherein:

the first part has a first end and a second end; and

the first central primary conductive trace stretches in a first direction on the first side of the carrier from the first end of the first part to the second end of the first part.

3 . The signal transmission device of claim 2 , wherein the first solid area of conductive material of the first lateral section stretches along the first direction for the whole length of the first part of the carrier.

4 . The signal transmission device of claim 1 , further comprising a connecting part joined to the first end of the first part of the carrier, where the central primary conductive trace and the secondary conductive traces stretch out onto the connecting part for allowing a connector to be mounted onto the connecting part in electrical contact with at least the primary conductive trace.

5 . The signal transmission device of claim 1 , wherein the first and second secondary conductive traces are placed in parallel with and at the same distance from the primary conductive trace.

6 . The signal transmission device of claim 1 , wherein the second solid area of conductive material of the second lateral section is on the first side of the carrier and joined with the second secondary conductive trace of the midsection.

7 . The signal transmission device of claim 6 , wherein the second solid area of conductive material of the second lateral section that is joined with the second secondary conductive trace of the midsection stretches, when the first part of the carrier is folded, in parallel with the midsection from a first position where it is joined to the second secondary conductive trace to a second position where this second solid area at least partly covers the first secondary conductive trace.

8 . The signal transmission device of claim 1 , wherein the first solid area of conductive material of the first lateral section stretches, when the first part of the carrier is folded, in parallel with the midsection from a first position covering the first secondary conductive trace to a second position at least partly covering the second secondary conductive trace.

9 . The signal transmission device of claim 1 , wherein the first solid area of conductive material of the first lateral section is on the second side of the carrier.

10 . The signal transmission device of claim 9 , wherein the midsection includes a third solid area of conductive material on the second side of the carrier and aligned with the first secondary conductive trace.

11 . The signal transmission device of claim 1 , wherein the first secondary conductive trace is electrically connected to conductive material of the first lateral section.

12 . The signal transmission device of claim 11 , wherein the electrical connection is provided through at least one via going through the midsection of the carrier.

13 . The signal transmission device of claim 1 , wherein the first solid area of conductive material of the first lateral section is on the first side of the carrier and joined with the first secondary conductive trace of the midsection.

14 . The signal transmission device of claim 1 , wherein:

at least one lateral section is wider than the midsection; and

the side of the second lateral section which includes a solid area of conductive material also includes a tertiary conductive trace separated from the solid area.

15 . The signal transmission device of claim 1 , wherein the carrier comprises a second part with an element connected at least to the central conductive trace.

16 . The signal transmission device of claim 1 , wherein:

at least the first part of the carrier is folded; and

the signal transmission device further comprises:

a first layer of adhesive material between the first lateral section and the midsection of the first part of the carrier; and

a second layer of adhesive material between the second lateral section and the midsection of the first part of the carrier.

17 . The signal transmission device of claim 16 , wherein the second layer of adhesive material is thicker than the first layer of adhesive material for providing the same distance between conductive material on the second side of the first lateral section and conductive material on the midsection as between conductive material on the first side of the second lateral section and the midsection.

18 . A portable radio communication device comprising the signal transmission device of claim 1 .