Apparatus and methods for electrical energy harvesting and/or wireless communication

1. Apparatus comprising:

a supercapacitor, comprising an electrolyte and a first surface and a second surface, the first surface being opposite the second surface;

a first printed circuit including a first conductor configured to operate as a first antenna, configured at least for wireless communication by transferring data bits wirelessly, positioned adjacent the first surface and configured to function as a current collector for the supercapacitor, and having a first electrical length to resonate in a first operational frequency band;

a second printed circuit including a second conductor configured to operate as a second antenna, positioned adjacent the second surface and configured to function as a current collector for the supercapacitor, the second conductor having a second electrical length to resonate in a second operational frequency band, wherein the supercapacitor is sandwiched between the first printed circuit and the second printed circuit, wherein the first antenna and the second antenna are configured to function simultaneously as antennas and as current collectors for the supercapacitor, wherein the first electrical length and the second electrical length are different and wherein the second conductor is galvanically isolated from the first conductor;

and charging circuitry configured to charge the supercapacitor via the first conductor and the second conductor;

wherein the first operational frequency band and the second operational frequency band are configured to one of partially overlap in frequency and not overlap in frequency.

2. Apparatus as claimed in claim 1 , wherein the first operational frequency band includes a near field communication (NFC) frequency band, a Qi frequency band, or a far field frequency band.

3. Apparatus as claimed in claim 1 , wherein the first conductor and the second conductor are coils having at least one turn.

4. Apparatus as claimed in claim 1 , further comprising a first flexible printed circuit including the first conductor, and a second flexible printed circuit including the second conductor, the supercapacitor being sandwiched between the first flexible printed circuit and the second flexible printed circuit.

5. Apparatus as claimed in claim 1 , further comprising radio frequency circuitry configured to provide signals to, and/or receive signals from, the first conductor.

6. Apparatus as claimed in claim 1 , further comprising radio frequency circuitry configured to provide signals to, and/or receive signals from, the second conductor.

7. A portable electronic device comprising apparatus as claimed in claim 1 .

8. A portable electronic device as claimed in claim 7 , wherein the portable electronic device is flexible.

9. A module comprising apparatus as claimed in claim 1 .

10. An electronic device comprising the apparatus of claim 1 , wherein the apparatus is configured to charge the electronic device in addition to being configured at least for wireless communication by transferring data bits wirelessly.

11. An electronic device comprising the apparatus of claim 1 , wherein the apparatus of claim 1 is configured to charge further electronic devices external to the electronic device, in addition to being configured for wireless communication by transferring data bits wirelessly.

12. A method comprising:

providing a supercapacitor, comprising an electrolyte and a first surface and a second surface, the first surface being opposite the second surface;

providing a first printed circuit including a first conductor configured to operate as a first antenna, configured at least for wireless communication by transferring data bits wirelessly, positioned adjacent the first surface and configured to function as a current collector for the supercapacitor, and having a first electrical length to resonate in a first operational frequency band;

providing a second printed circuit including a second conductor configured to operate as a second antenna, positioned adjacent the second surface and configured to function as a current collector for the supercapacitor, the second conductor having a second electrical length to resonate in a second operational frequency band, wherein the supercapacitor is sandwiched between the first printed circuit and the second printed circuit, wherein the first antenna and the second antenna are configured to function simultaneously as antennas and as current collectors for the supercapacitor, wherein the first electrical length and the second electrical length are different and wherein the second conductor is galvanically isolated from the first conductor;

and further providing charging circuitry configured to charge the supercapacitor via the first conductor and the second conductor;

wherein the first operational frequency band and the second operational frequency band are configured to one of partially overlap in frequency and not overlap in frequency.

13. A method as claimed in claim 12 , further comprising providing a first flexible printed circuit including the first conductor, and providing a second flexible printed circuit including the second conductor, the supercapacitor being sandwiched between the first flexible printed circuit and the second flexible printed circuit.

14. A method as claimed in claim 12 , further comprising providing radio frequency circuitry configured to provide signals to, and/or receive signals from, the first conductor.