Multi-band monopole antenna with inverted U-shaped parasitic plane

A microstrip-fed printed monopole antenna having a parasitic plane is proposed for multi-band applications. By inserting an inverted U-shaped parasitic plane on the bottom of the dielectric substrate, the proposed antenna can easily cover DCS/UMTS/WiBro/2.4 GHz WLAN and 5.2/5.8 GHz WLAN bands at the same time. In addition, a Gamma-shaped slit is inserted on the main patch to cover the GSM frequency band. Experimental and numerical results of the designed monopole antenna are presented and analysed.