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Alibakhshikenari, Mohammad, Naser-Moghadasi, Mohammad, Ali Sadeghzadeh, Ramazan and Virdee, Bal Singh (2015) Metamaterial-based antennas for integration in UWB transceivers and portable microwave handsets. International Journal of RF and Microwave Computer-Aided Engineering. ISSN 1096-4290
Two planar antennas based on metamaterial unit-cells are designed, fabricated, and tested. The unit-cell configuration consists of H-shaped or T-shaped slits and a grounded spiral. The slits essentially behave as series left-handed capacitance and the spiral as a shunt left-handed inductance. The unit-cell was modeled and optimized using commercial 3D full-wave electromagnetic simulation tools. Both antennas employ two unit-cells, which are constructed on the Rogers RO4003 substrate with thickness of 0.8 mm and er 5 3.38. The size of H-shaped and T-shaped unit cell antennas are 0.06k0 3 0.02k0 3 0.003k0 and 0.05k0 3 0.02k0 3 0.002k0, respectively, where k0 is the free–space wavelength. The measurements confirm the H–shaped and T–shaped unit-cell antennas operate across 1.2–6.7 GHz and 1.1–6.85 GHz, respectively, for voltage standing wave ratio (VSWR) < 2, which correspond to fractional bandwidth of ~140% and ~ 145%, respectively. The H-shaped unit-cell antenna has gain and efficiency of 2–6.8 dBi and 50–86%, respectively, over its operational range. The T-shaped unit-cell antenna exhibits gain and efficiency of 2–7.1 dBi and 48–91%, respectively. The proposed antennas have specifications applicable for integration in UWB wireless communication systems and microwave portable devices.
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