In this paper, a tri-band metamaterial-inspired monopole antenna is proposed for multi-band wireless applications. A metamaterial consisting of three dual-band modified S-shaped resonators (MSRs) is directly connected to a regular monopole element, which can not only support the two WiFi bands but also bring the resonant frequency of monopole element down to the WiMAX band while the length of the antenna is maintained unchanged. The simulated and measured results verify our design for the wireless applications.
2. Chen, S.-B., Y.-C. Jiao, W. Wang, and F.-S. Zhang, "Modified T-shaped planar monopole antennas for multiband operation," IEEE Trans. Microw. Theory Tech., Vol. 54, 3267-3270, 2006.
3. Liao, W.-J., S.-H. Chang, and L.-K. Li, "A compact planar multiband antenna for integrated mobile devices," Progress In Electromagnetics Research, Vol. 109, 1-16, 2010.