Voltage‐current characteristics of a superconducting closed loop which consists of a parallel combination of two linear series arrays ofN‐Josephson junctions are theoretically and experimentally investigated forN=3. The results show that the rf‐induced constant voltage steps inv‐icharacteristics in the presence of the rf radiation of frequencyFappear at voltages corresponding tonNF&Fgr;0with an integern. We find that the junctions show a coherent behavior even though the closed loop does not consist of identical junctions. The voltage standard application of this circuit seems feasible.