Design of dual-band left-handed materials with double-left-handed characteristics

In order to enhance information capacity and accommodate the rapid development of modern science and technology, design of left hand materials with the broadband and multiple frequency resonant characteristics has gained great attention. In this paper, we have theoretically devised and then experimentally validated a novel left-handed material (LHM) structure for multi-band operation. The proposed structure consists of a split-ring resonator (SRR) and defected ground structure (DGS) structure, which can provide arbitrarily positioned passbands by varying some geometrical parameters of the unit cell. The proposed dual LHM structure has been fabricated to demonstrate the applicability of the proposed unit cell. The experimental measured result is in good agreement with the simulation results. The designed device exhibits dual-pass band centered at 2.4GHz and 5.8GHz. The proposed LHM structure exhibits negative permittivity, and permeability in the targeted frequency ranges, which can be used in modern wireless communication systems for dual-band antenna application.