Triple-band metamaterial-loaded small monopole antenna for mobile applications

A simple tri-band metamaterial-loaded small planar monopole antenna is proposed in this letter. In addition to the regular monopole resonance, two inverted L-shaped slots on the monopole patch are introduced to realize two other resonances. The metamaterial loading is then used to expand the lower resonant frequency. The proposed monopole antenna operates at two narrow bands, 5.2 and 6.0 GHz, and one wide band, 2.3-4.1 GHz, covering 2.4-GHz WLAN/Bluetooth (2400-2484 MHz), mobile WiMAX (2500-2690/3400-3690 MHz), 5-GHz WLAN (5150-5350/5725-5825 MHz), and ITS (5795-6400 MHz) with the advantages of simple fabrication, miniaturization, and compactness.