Devices and methods for a dielectric rotary joint

A method comprising:

• transmitting radio-frequency (RF) electromagnetic waves into a first dielectric waveguide configured to guide propagation of the RF waves inside the first dielectric waveguide, wherein a first side of the first dielectric waveguide is configured to emit an evanescent field associated with the propagation of the RF waves inside the first dielectric waveguide;
• detecting induced RF waves propagating inside a second dielectric waveguide having a second side positioned at a predetermined distance to the first side of the first dielectric waveguide, wherein the induced RF waves are associated with the evanescent field from the first dielectric waveguide;
• and
• rotating the first dielectric waveguide relative to the second dielectric waveguide such that the first side of the first dielectric waveguide remains at the predetermined distance to the second side of the second dielectric waveguide during the rotating.

A device comprising:

• a first dielectric waveguide that guides propagation of first radio-frequency (RF) electromagnetic waves inside the first dielectric waveguide, wherein a first side of the first dielectric waveguide emits a first evanescent field associated with the propagation of the first RF waves inside the first dielectric waveguide;
• a second dielectric waveguide having a second side positioned at a predetermined distance to the first side of the first dielectric waveguide, wherein the second dielectric waveguide guides propagation of second RF waves inside the second dielectric waveguide, wherein the second side of the second dielectric waveguide emits a second evanescent field associated with the propagation of the second RF waves inside the second dielectric waveguide, wherein the first RF waves propagating inside the first dielectric waveguide include first induced RF waves associated with the second evanescent field from the second dielectric waveguide, and wherein the second RF waves propagating inside the second dielectric waveguide include second induced RF waves associated with the first evanescent field from the first dielectric waveguide;
• a first probe coupled to the first dielectric waveguide;
• a second probe coupled to the second dielectric waveguide;
• and
• an actuator that causes a rotation of the first dielectric waveguide or the second dielectric waveguide, wherein the first side of the first dielectric waveguide remains at the predetermined distance to the second side of the second dielectric waveguide during the rotation caused by the actuator.