Subwavelength Array of Planar Monopoles With Complementary Split Rings Based on Far-Field Time Reversal

With the aid of specific microstructures in a subwavelength array, time-reversed electromagnetic wave can display spatial super-resolution focusing in far-field zone. A subwavelength array of planar monopoles is proposed in this paper. Each element of the array, the planar monopole, is etched aperiodically with many microstructured complementary split rings. An important property of this antenna is that if multiple such planar monopoles are placed face to face, the proposed array can perform time-reversal far-field focusing with a spatial super-resolution as small as one twentieth of a wavelength. The validity of the proposed array with super-resolution characteristics is verified by the communication experiments with a data rate of 660 Mbit/s. The proposed subwavelength array is easy-to-design and convenient for integration.