Two-dimensional magnetic field dependence of zero and finite voltage steps in current-voltage characteristics of rectangular shape niobium tunnel junctions

► Josephson current Ic through Nb superconducting junction was measured. ► Ic dependence on Hx, Hy magnetic fields was product of Fraunhofer pattern. ► Numerical simulation of Ic−(Hx, Hy) matched the measured result. ► Modulation period inversely proportional to the vertical edge length of junction. ► Resonant current steps studied by superconducting planar circuit model.