Planar balun transformer device

1. An electric transformer device configured to adapt an electrical line for a differential signal to an electrical line for a single-ended signal, comprising:

a support plate having a first base face and an opposite second base face;

a first port connectable to the electrical line for the differential signal;

a second port connectable to the electrical line for the single-ended signal;

a first conductive track associated to said first base face of the support plate and electrically connecting said first port to said second port; and

a conductive path associated to said second base face of the support plate, wherein said conductive path comprises:

a second conductive track electrically connecting said first port to said second port; and

a third conductive track electrically connecting said first port to said second port.

2. The electric transformer device according to claim 1 , wherein said first, second and third conductive tracks are metal tracks made of copper.

3. The electric transformer device according to claim 2 , wherein said first, second and third conductive tracks are obtained by means of a selective chemical removal operation of the copper from a copper sheet that is secured on each of said first and second base faces of the support plate.

4. The electric transformer device according to claim 2 wherein said copper has a thickness ranging between 17 μm and 70 μm.

5. The electric transformer device according to claim 1 , wherein said first, second and third conductive tracks are each shaped so as to form a serpentine path.

6. The electric transformer device according to claim 1 , wherein each of said first, second and third conductive tracks has a length of about λ/4, where λ represents a wavelength of the signal at a center of a pass-band of the electric transformer device.

7. The electric transformer device according to claim 6 , having an operative frequency band ranging between 760-960 MHz.

8. The electric transformer device according to claim 1 , wherein said second conductive track is substantially symmetrical relative to the third conductive track.

9. The electric transformer device according to claim 1 , configured to process radio-frequency signals with powers ranging between about 10 Watts and about 500 Watts.

10. The electric transformer device according to claim 1 , having an insertion loss of about 0.1 dB.

11. A power amplification electronic equipment of signals for radio-frequency, comprising:

a heat sink support in metal material;

a board of a printed electronic circuit that is secured to said heat sink support, said board comprising a support plate having a first base face and an opposite second base face, said board including at least one electric transformer device comprising:

a first port connectable to an electrical line for a differential signal;

a second port connectable to an electrical line for a single-ended signal;

a first conductive track associated to said first base face of the support plate and electrically connecting said first port to said second port; and

a conductive path associated to said second base face of the support plate, wherein said conductive path comprises:

a second conductive path electrically connecting said first port to said second port; and

a third conductive track electrically connecting said first port to said second port.

12. The power amplification electronic equipment according to claim 11 , wherein said heat sink support comprises at least one recess configured to separate the second base face of said at least one electric transformer device away from a body of the heat sink support.

13. The power amplification electronic equipment according to claim 11 , wherein said first, second and third conductive tracks are metal tracks made of copper.

14. The power amplification electronic equipment according to claim 13 , wherein said copper has a thickness ranging between 17 μm and 70 μm.

15. The power amplification electronic equipment according to claim 11 , wherein said first, second and third conductive tracks are each shaped so as to form a serpentine path.

16. The power amplification electronic equipment according to claim 11 , wherein each of said first, second and third conductive tracks has a length of about λ/4, where λ represents a wavelength of the signal at a center of a pass-band of the electric transformer device.

17. The power amplification electronic equipment according to claim 16 , having an operative frequency band ranging between 760-960 MHz.

18. The power amplification electronic equipment according to claim 11 , wherein said second conductive track is substantially symmetrical relative to the third conductive track.

19. The power amplification electronic equipment according to claim 11 , wherein the electric transformer device has an insertion loss of about 0.1 dB.

20. An electric transformer device, comprising:

a support plate having a first base face and an opposite second base face;

a first port connectable to a differential signal line at a first signal terminal and a second signal terminal;

a second port connectable to a single-ended signal line at a third signal terminal and a ground node;

a first conductive track mounted on said first base face, the first conductive track having a first serpentine path electrically connecting the first signal terminal said first port to the third signal terminal of said second port;

a second conductive track mounted on said second base face, the second conductive track having a second serpentine path electrically connecting the first signal terminal of said first port to the ground node of said second port; and

a third conductive track mounted on said second base face, the third conductive track having a third serpentine path electrically connecting the second signal terminal of said first port to the ground node of said second port;

wherein the first serpentine path matches and is aligned with the second serpentine path; and

wherein the second and third serpentine paths are symmetric mirror images of each other.