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In this paper, an ultra compact dual-band metamaterial antenna based on a new asymmetric generalized negative refractive index transmission line is introduced. The antenna was designed to support the 900 MHz GSM and 2400 RFID/WiFi bands. Moreover, the antenna size is only (15 × 20 mm2) which is less than (0.08λg × 0.1λg) at the center frequency of the first resonance and (0.22λg × 0.29λg) at the center frequency of the second resonance. The theoretical design steps of the antenna are explained. The dual-band antenna design has been validated using equivalent circuit modelling, electromagnetic full wave simulations and practical measurement. The results illustrate that the antenna has the first resonance centred at 0.9 GHz and the second at 2.4 GHz with 15 dB return loss in the two bands. Good agreements among the circuit modelling, electromagnetic full wave simulation and practical measurements have been achieved.

CPW DUAL-BAND ANTENNA BASED ON ASYMMETRIC GENERALIZED METAMATERIAL Π NRI TRANSMISSION LINE FOR ULTRA COMPACT APPLICATIONS