Metamaterials Realized by Novel Compact Structures

This paper presents a novel compact meta-structure which is characterized by simultaneously negative permittivity (epsiv) and permeability (mu) and easier to be integrated with other components by conventional printed circuit board (PCB) technology. Instead of using straight metal rods, the electric resonance is produced by a spiral microstrip line (SML), and split-ring resonators (SRR) with the end-coupling by interdigital capacitors are added to get a magnetic resonance. The main effective medium parameters of permittivity and permeability are extracted by simulated results of S-parameters where double negative is obtained with a Lorentz medium model from 2.9 GHz to 3.2 GHz. In such a novel compact meta-structure, the unit sizes of both SML-cell and novel SRR-cell are 3.3 mm, which is only about 1/30lambda₀ at the frequency of 3 GHz.