NEAR FIELD MICROWAVE RESISTIVITY MICROSCOPE INCLUDING A DIELECTRIC RESONATOR

摘要

A microwave microscope having a resonant slit (60) formed in a highly conductive end (58) of a microwave waveguide forming a probe tip (50). A short dielectric rod (54) is fit into the waveguide near its conductive end (58). A longer dielectric rod (66) is placed in back of the short dielectric rod (54) with a small gap (68) between the two rods. The length of the shorter rod (54) and the size of the gap (68) are chosen to form a dielectric resonator at the microwave frequency adjacent to the probe tip (50). Thereby, the impedance of the waveguide can be matched to the generally high impedance of the slit probe tip. Preferably, the dielectric constant of the materials is high, thereby reducing the size of the waveguide and probe tip relative to the microwave wavelength.