A coplanar waveguide may include a first transmission line extending between a first ground plane and a second ground plane at a first interconnect level. The coplanar waveguide may further include a shielding layer at a second interconnect level. The shielding layer may include a first set of conductive fingers coupled to the first ground plane. The first set of conductive fingers may be interdigitated with a second set of conductive fingers that are coupled to the second ground plane. Only a dielectric layer may be between the first set of conductive interdigitated fingers and the second set of conductive interdigitated fingers. The first ground plane, the second ground plane, the dielectric layer, and the shielding layer may form a capacitor.