Patent ID: 8063731

Claim:
An RF resistor having a planar layer structure on a substrate comprising a resistive layer for converting RF energy into heat, an input conductor track for the infeed of RF energy, and an earthing conductor track for making an electrical connection to an earth contact, the input conductor track being electrically connected to a first end of the resistive layer, the earthing conductor track being electrically connected to a second end of the resistive layer which is opposite from the first end, and the resistive layer being bounded, between the first end and the second end, by lateral faces in a direction perpendicular to a direction of propagation of the RF energy in the resistive layer and perpendicular to a normal to the planar layer structure, the resistive layer having at least one incision, which at least partly constricts the cross-section of the resistive layer, to match the characteristic impedance to a predetermined value, the incision being formed to be spaced away from the lateral faces of the resistive layer, characterised in that the incision is formed to be U-shaped in the plane of the resistive layer, with the U having two sides and a bottom which connects the sides.