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In this letter, a compact design of electric meta‐atom has been proposed as a dual band negative permittivity metamaterial. Compared with the earlier work, the proposed dual band meta‐atom has a better coupling strength at both the resonances and it is also more compact. This dual band design utilizes the mechanism of the resonance coupling between a meander line loaded delta loop meta‐atom and a rectangular close ring meta‐atom. The proposed meta‐atom is designed and investigated by both simulation and experiment with good agreement. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1152–1156, 2015

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In this letter, a simple and compact directivity enhancement of slot antenna using a grounded metamaterial slab is proposed. This approach two different configurations. In the first configuration dielectric layers are used for designing antenna and metamaterial slab. Despite the directivity enhancement bandwidth of about 10.74% is obtained for It is also shown that, over the whole working band broadside directivity improvement is maintained the unloaded slot. In the second configuration of dielectric is used for designing both antenna and metamaterial slab. Thus, in this case, the total thickness of the loaded is noticeably reduced to 0.5 mm, or 0 0.014 λ a simple and compact approach for directivity enhancement of slot antenna using a grounded This approach has been applied in In the first configuration, two for designing antenna and metamaterial directivity enhancement, an improved for this configuration. , over the whole working band, a significant maintained compared to configuration, only a single layer of dielectric is used for designing both antenna and metamaterial of the loaded antenna 0 λ at resonance.Waveguide (CPW), Slot, MNZ and EVL Metamaterial, Leaky wave, Directivity enhancement.

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