A rotary joint includes a first part and a second part configured to rotate around a rotation axis against the first part. The first part has a first magnetic core and a capacitive data link component. The second part has a second magnetic core for coupling power with the a first magnetic core and a second capacitive data link component to transfer data from and/or to the first capacitive data link component. To weaken magnetic stray fields from the magnetic core, a resonant shield is provided outside the airgap between the magnetic cores. The resonant shield comprises an open ring-shaped structure, having two open ends which are connected by a capacitor to form a resonant circuit.