We present results on a near‐field scanning probe microwave microscope which is based on the nonlinear behavior of a YBa2Cu3O7direct‐current superconducting quantum interference device (SQUID). Our system has a spatial resolution of about 30 &mgr;m and derives its probing field from circulating currents in the SQUID loop. The frequency is set by the Josephson relation and is continuously tunable up to about 200 GHz. By imaging small patterned normal metal thin‐film samples of Cu and Nb at 77 K, we have confirmed the operating bandwidth of the system and investigated the nature of the imaging process. ©1995 American Institute of Physics.