A mono, dual and triple band switchable metamaterial-based antenna

This paper presents a multiband frequency reconfigurable antenna based on metamaterials. It is composed of a CPW fed straight-line monopole with three Double Split-Ring Resonators (DSRRs) of different size, disposed at its proximity in the upper and bottom sides. Each cell exhibits a negative permeability over a narrow frequency band over which a magnetic coupling with the monopole is produced. Consequently, three new frequency bands proportional to the electrical length of the three DSRR´s are created. By inserting a single switch at each metamaterial cell, it is possible to activate/deactivate them. The activation/deactivation of the different DSSR´s can then be used not only to enable/disable the new bands, but also to control the operating band of the monopole. In total, the proposed antenna can be operated in eight (8) different modes corresponding to mono, dual and triple band operations. It is believed that proposed approach to achieve frequency reconfiguration can be suitable for applications using multiple bands such as cognitive radios.