Rotational apparatus for communication

1. An apparatus comprising:

a first housing comprising:

a first grounded portion; and

a first coupling element; and

a second housing comprising:

a second grounded portion; and

a second coupling element,

wherein the first housing and the second housing are joined at a joint that is configured to enable relative rotational movement of the first housing and the second housing; and

wherein the apparatus has a first configuration in which the first housing and the second housing have been rotated to a first relative orientation at which the first coupling element and the second coupling element are aligned and a radio frequency current path is formed between the first grounded portion and the second grounded portion via the first coupling element and the second coupling element and

the apparatus has a second configuration in which the first housing and the second housing have been rotated to a second relative orientation at which the first coupling element and the second coupling element are not aligned and the radio frequency current path is not formed between the first grounded portion and the second grounded portion via the first coupling element and the second coupling element.

2. An apparatus as claimed in claim 1 , wherein in the first configuration the first coupling element and the second coupling element are aligned and galvanically connect to form the radio frequency current path.

3. An apparatus as claimed in claim 1 , wherein in the first configuration the first coupling element and the second coupling element are aligned and form a capacitor that completes the radio frequency current path.

4. An apparatus as claimed in claim 1 , further comprising means for extending the first coupling element when the first coupling element and the second coupling element are aligned, wherein the extension of the first coupling element brings at least a portion of the first coupling element towards the second coupling element.

5. An apparatus as claimed in claim 1 , further comprising an electromagnetic device configured to extend the first coupling element when the first coupling element and the second coupling element are aligned, wherein the extension of the first coupling element brings at least a portion of the first coupling element towards the second coupling element.

6. An apparatus as claimed in claim 5 , wherein the electromagnetic device is configured to use a magnetic field to extend the first coupling element when the first coupling element and the second coupling element are in alignment.

7. An apparatus as claimed in claim 5 , wherein the electromagnetic device is a permanent magnet.

8. An apparatus as claimed in claim 1 further comprising: means for retracting the first coupling element when the first coupling element and the second coupling element move out of alignment, wherein the retraction of the first coupling element brings at least a portion of the first coupling element away from the second coupling element.

9. An apparatus as claimed in claim 1 further comprising: a mechanical device configured to retract the first coupling element when the first coupling element and the second coupling element move out of alignment, wherein the retraction of the first coupling element brings at least a portion of the first coupling element away from the second coupling element.

10. An apparatus as claimed in claim 9 , wherein the mechanical device has a resiliently deformable device that has a natural equilibrium in a retracted state and is held in a deformed state while the first coupling element and the second coupling element are in alignment.

11. An apparatus as claimed in claim 9 , wherein the mechanical device is a spring.

12. An apparatus as claimed in claim 1 , wherein the first housing further comprises a first additional coupling element, wherein the apparatus has a third configuration, different to the first configuration, in which the first housing and the second housing have been rotated to a third relative orientation, different to the first orientation, at which the first additional coupling element and the second coupling element are aligned and a radio frequency current path is formed between the first grounded portion and the second grounded portion via the first additional coupling element and the second coupling element and the apparatus has a fourth configuration in which the first housing and the second housing have been rotated to a fourth relative orientation at which the first additional coupling element and the second coupling element are not aligned and the radio frequency current path is not formed between the first grounded portion and the second grounded portion via the first additional coupling element and the second coupling element.

13. An apparatus as claimed in claim 12 , wherein the fourth configuration is the same as the second configuration.

14. An apparatus as claimed in claim 1 , wherein the first housing further comprises: a first additional coupling element and

the second housing further comprises: a second additional coupling element and wherein the apparatus has a fifth configuration, different to the first configuration, in which the first housing and the second housing have been rotated to a fifth relative orientation, different to the first orientation, at which the first additional coupling element and the second additional coupling element are aligned and a radio frequency current path is formed between the first grounded portion and the second grounded portion via the first additional coupling element and the second additional coupling element and

the apparatus has a sixth configuration in which the first housing and the second housing have been rotated to a sixth relative orientation at which the first additional coupling element and the second additional coupling element are not aligned and the radio frequency current path is not formed between the first grounded portion and the second grounded portion via the first additional coupling element and the second additional coupling element.

15. An apparatus as claimed in claim 1 , wherein the second housing further comprising: a second additional coupling element

wherein the apparatus has a seventh configuration, different to the first configuration, in which the first housing and the second housing have been rotated to a seventh relative orientation, different to the first orientation, at which the first additional coupling element and the second coupling element are aligned and a radio frequency current path is formed between the first grounded portion and the second grounded portion via the first additional coupling element and the second coupling element and

the apparatus has an eighth configuration in which the first housing and the second housing have been rotated to an eighth relative orientation at which the first additional coupling element and the second coupling element are not aligned and the radio frequency current path is not formed between the first grounded portion and the second grounded portion via the first additional coupling element and the second coupling element.

16. An apparatus as claimed in claim 1 wherein the joint forms a permanent radio frequency current path between the first grounded portion and the second grounded portion and the first coupling element and the second coupling element, when aligned in the first configuration, form a temporary radio frequency current path between the first grounded portion and the second grounded portion.

17. An apparatus as claimed in claim 1 wherein the first housing comprises a planar display face and the joint constrains rotation to rotation about an axis of rotation perpendicular to the plane of the planar display face.

18. An apparatus as claimed in claim 1 wherein the first housing comprises a planar display face and the joint constrains rotation to rotation about an axis of rotation parallel to the plane of the planar display face.

19. A method comprising:

providing an apparatus comprising: a first housing including a first grounded portion and a first coupling element; and a second housing including a second grounded portion and a second coupling element, wherein the first housing and the second housing are joined at a joint that is configured to enable relative rotational movement of the first housing and the second housing;

instructing the creation of a first configuration of the apparatus in which the first housing and the second housing have been rotated to a first relative orientation; and

instructing the creation of a second configuration of the apparatus in which the first housing and the second housing have been rotated to a second relative orientation,

wherein at the first configuration the first coupling element and the second coupling element are aligned and a radio frequency current path is formed between the first grounded portion and the second grounded portion via the first coupling element and the second coupling element and

wherein at the second configuration the first coupling element and the second coupling element are not aligned and the radio frequency current path is not formed between the first grounded portion and the second grounded portion via the first coupling element and the second coupling element.