  We describe the use of a cryogenic near-field scanning microwave microscope
to image microwave electric fields from superconducting and normal-metal
microstrip resonators. The microscope employs an open-ended coaxial probe and
operates from 77 to 300 K in the 0.01-20 GHz frequency range with a spatial
resolution of about 200 mm. We describe the operation of the system and present
microwave images of Cu and Tl2Ba2CaCu2O8 microstrip resonators, showing
standing wave patterns at the fundamental and second harmonic frequencies.
