Detecting buried objects with subwavelength resolution using a near-field antenna-array probe

A near-field antenna-array probe is used to perform subwavelength imaging on objects buried a quarter-wavelength beneath the surface of a dielectric slab. Short passive dipole objects are detected by monitoring the input reflection coefficient of the probe as it is scanned over the dielectric. Experimental measurements are presented that verify the subwavelength imaging behavior. A minimum resolvable separation between two objects in terms of dielectric wavelengths was measured to be 0:295λ at a distance of λ/4, compared to 0:639λ for a single monopole probe.