  We fabricated superconducting coplanar waveguide resonator with leads for dc
bias, which enables the ac conductivity measurement under dc bias. The current
and the magnetic field dependences of resonance properties were measured, and
hysteretic behavior was observed as a function of the dc driving current. The
observed shift in the inverse of the quality factor and the center frequency
were understood by considering both the motion of vortices and the suppression
of the order parameter with dc current. Our investigation revealed that the
strongly pinned vortices have little infuluence on the change in the center
frequency, while it still affects that of the quality factor. Our results
indicate that an accurate understanding of the dynamics of driven vortices is
indispensable when we attempt to control the resonance properties with high
precision.
