In this paper a monopole antenna for WLAN and WiMAX frequencies is proposed. The given antenna is composed of a rectangular patch monopole antenna having an E-shaped slot with two backward slits on the substrate and a defected ground plane. The antenna exhibits single band, which creates an impedance bandwidth of 2 GHz for the working band of 4-6 GHz. The various characteristic parameters like S-parameters, gain, current distribution, and radiation pattern are studied. The proposed antenna is suitable for IEEE 802.11 WLAN standards in the bands 5.2/5.8 GHz and WiMAX standards in the bands at 5.5 GHz. Microstrip feeding technique is used. The compact size antenna using DGS technique is simulated using IE3D software
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