An ion guide includes electrodes and an RF generator. The electrodes extend in a Z-axis that is straight or curved with a radius that is larger than a distance between the electrodes. The electrodes are made of carbon filled ceramic resistors, silicon carbide, or boron carbide to form bulk resistance with specific resistance between 1 and 1000 Ohm*cm. Conductive Z-edges are disposed on each electrode. An insulating coating is disposed on one side of each electrode and oriented away from an inner region of the ion guide surrounded by said electrodes. At least one conductive track per electrode is attached on a top side of the insulating coating. The conductive track is connected to one conductive electrode edge. The RF generator has at least two sets of secondary coils with DC supplies connected to central taps of the sets of secondary coils to provide at least four distinct signals.