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In this paper, a new design of multiband metamaterial (MTM) to be employed in novel electromagnetic components and devices is presented both numerically and experimentally. The structure is designed based on the concentric multiple open-ring architecture in which each ring provides a magnetic resonance at different frequencies. The number of resonances depends on the number of the ring resonators composed by the unit cell. The proposed design enables an application as creating multiband left-handed MTMs by combining the proposed structure with a conducting strip. In addition, an HF application is also designed and presented. The investigated structure, supporting multiband operation, is a potential candidate to achieve efficient electrically small microwave/terahertz (THz) structures and can suitably be used for the miniaturization of microwave and THz components.