Radiation properties of a split ring resonator and monopole composite. Phys Status Solidi B

We studied the far field radiation properties of a new resonator antenna composed of split ring resonators (SRRs) and a monopole. It is shown that the antenna size at the operation frequency (3.52 GHz) is ap-proximately one tenth of the free space wavelength (λ/10). Moreover, increasing the number of SRRs yields steerability properties. These achievements provide a way to create rather small steerable resonant antennas. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim One of the most common elements of metamaterials, which was introduced by Pendry et al. in 1999, is the split ring resonator (SRR) [1]. SRR is an nonmagnetic conducting unit, in which and its periodic array yields negative effective magnetic permeability with an enhanced magnitude when the frequency of the incident electromagnetic field is close to the SRR resonance frequency. The resonance frequency of the SRR depends on its geometrical parameters [2, 3]. The structure can show resonant behavior at frequencies that are much larger than its size. Experimental demonstration of this structure at microwave frequencies has been achieved by many groups [2–7]. The application of metamaterials to increase antenna performance is of great interest. It was shown that introducing metamaterials could enhance the radiated power of the antenna [8]. Moreover, negativ