Abstract. In this paper, an effective medium ratio obeying, negative refractive index, compact meta-atom was designed, manufactured and tested for operation in a multiband microwave regime. The proposed meta-atom structure obeyed better effective medium ratio. The results of the measurement were verified by the commercially available Computer Simulation Technology (CST) Studio Suite 2014 simulator. The effective medium ratio obeying meta-atom displayed multiband response, in conjunction with negative refractive index property over a certain frequency band in the microwave frequency span. Furthermore, a few parametric analyses were completed with the meta-atom, and the effective medium parameters were investigated. The sizes and complex scattering constitutive parameters of the proposed negative refractive index, compact meta-atom are applicable for multiband applications in microwave regime.Key words: compact, effective medium ratio, meta-atom, multiband. band, only with a single negative property. A diamond-shaped, single-sided, left-handed metamaterial was proposed to show increased reception of power and a high transmission peak [8]. In addition, the operating band of the diamond-shaped unit-cell was X-band only, and the EMR of the unit-cell was too small. A novel hexagon meta-atom cluster was proposed as a compact metamaterial [9], whereas the metamaterial covered the S-band only, and the resonance number was 1, with EMR 2.65. In [10], a novel, two-rectangular, U-shaped, double-negative metamaterial was suggested for single-band operation. Moreover, the design of the unit-cell of the metamaterial was intended for C-band, and the EMR was of less than standard value. Theodosius et al. [11], depicted a double-negative (DNG) metamaterial of compact size with 6.9 EMR, but they utilized two different resonators at two opposing sides of the substrate. New double-negative and single-negative metamaterial analyses were performed for tri-band operation by Islam et al. [12], yet the metamaterial design was very large in size and the EMR was too small. A Greek-key pattern was then proposed as a miniaturized metamaterial [13], whereas the metamaterial covered the S-band only, with the number of resonances being 2. A new dual-band metamaterial unit-cell construction with EMR 7.14 was proposed in [14], but it suggested single-negative property for its dual-band operation. A compact, negative-index metamaterial was analyzed for multiband operation in [15], whereas the metamaterial covered the S-band and C-band with two resonances only. Cumali et al. in [16] depicted a resonator-based metamaterial using microstrip technology with 4.76 EMR, but the metamaterial covered L-band only and the number of resonances was one.
An effective medium ratio obeying meta-atom for multiband applicationsIn this study, a new, compact, double-C-shaped metamaterial unit-cell for microwave multiband applications with better EMR properties is being introduced. The proposed metamaterial demonstrates negative permittivity and negative perme-