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Characteristics of SFQ signal propagation in oxide circuits were investigated by numerical simulation. The numerical simulation for the SFQ signal propagating in the Josephson transmission line (JTL) was performed by assuming the inductor to be a passive transmission line and by taking into account the high IcRn value of oxide junctions. The SFQ signal was found to oscillate when the inductor length was more than 20 μm. The origin of the oscillation and the oscillation conditions were investigated with respect to the Josephson plasma frequency. A shunt resistor connected between an inductor and the groundplane was found to be effective for suppressing the oscillation. The JTL in which shunt resistors are connected may also be used as a delay line.