An ion trap (200; 400) comprising: a conductive ring-shaped central electrode (202; 402) having a first aperture extending (211; 411) from a first open end to a second open end; a signal source (206; 406) generating a trap signal having at least an alternating current component between a first and second terminal, wherein the first terminal is coupled to the central electrode and the second terminal is coupled to a first reference voltage potential; a conductive first electrode end cap (201; 401) disposed adjacent to the first open end of the central electrode (202; 402) and coupled to a second reference voltage potential, wherein a first intrinsic capacitance (209; 409) is formed between a surface of the first electrode end cap (201; 401) and a surface of the first open end of the central electrode (202; 402); and a conductive second electrode end cap (203; 403) disposed adjacent to the second open end of the central electrode (202; 402) and coupled to a third reference voltage potential with a first electrical circuit (204, 205; 425), wherein a second intrinsic capacitance (208; 408) is formed between a surface of the second electrode end cap (203; 403) and a surface of the second open end of the central electrode (202; 402), wherein a fractional part of the trap signal is impressed on the second electrode end cap (203; 403) in response to a voltage division of the trap signal by the second intrinsic capacitance (208; 408) and an impedance of the first electrical circuit (204, 205; 425), characterized in that the first electrical circuit (204, 205; 425) comprises a capacitor in parallel with a resistor, and that the impedance of the resistor shunting the capacitor is significantly larger than the impedance of the capacitor in a frequency range of operation of the ion trap (200; 400) to make the voltage division substantially frequency independent. a conductive ring-shaped central electrode (202; 402) having a first aperture extending (211; 411) from a first open end to a second open end; a signal source (206; 406) generating a trap signal having at least an alternating current component between a first and second terminal, wherein the first terminal is coupled to the central electrode and the second terminal is coupled to a first reference voltage potential; a conductive first electrode end cap (201; 401) disposed adjacent to the first open end of the central electrode (202; 402) and coupled to a second reference voltage potential, wherein a first intrinsic capacitance (209; 409) is formed between a surface of the first electrode end cap (201; 401) and a surface of the first open end of the central electrode (202; 402); and a conductive second electrode end cap (203; 403) disposed adjacent to the second open end of the central electrode (202; 402) and coupled to a third reference voltage potential with a first electrical circuit (204, 205; 425), wherein a second intrinsic capacitance (208; 408) is formed between a surface of the second electrode end cap (203; 403) and a surface of the second open end of the central electrode (202; 402), wherein a fractional part of the trap signal is impressed on the second electrode end cap (203; 403) in response to a voltage division of the trap signal by the second intrinsic capacitance (208; 408) and an impedance of the first electrical circuit (204, 205; 425), characterized in that the first electrical circuit (204, 205; 425) comprises a capacitor in parallel with a resistor, and that the impedance of the resistor shunting the capacitor is significantly larger than the impedance of the capacitor in a frequency range of operation of the ion trap (200; 400) to make the voltage division substantially frequency independent.