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In this article M-shape multiband antenna is proposed for wireless communication systems such as GPS, WLAN and ISM. The proposed antenna resonates at four bands, I (1.436 GHz -1.586 GHz), II (2.313 GHz-2.50 GHz), III (4.844 GHz -5.150 GHz) and IV (5.714 GHz-5.951 GHz) with improved return losses and impedance matching. These bands covering GPS band 1.57GHz, WLAN bands 2.4GHz, 5.0GHz, and 5.8GHz and ISM bands 2.45GHz and 5.75GH with radiation efficiency 65.15%, 76.69%, 59.95%, 54.31%, 73.17% and 53.68% respectively and VSWR<2 for all bands.Â The antenna has size of 43.8mmx18.6mm with defected ground structure (DGS) and fed by 50ohm micro strip feed line. The antenna is designed on FR-4 substrate material with thickness of 1.6mm, relative permittivity is 4.3 and tangent losses are 0.025. The proposed design is simulated in CST (computer simulation technology) microwave studio. The proposed antenna is fabricated and results are measured with help of network analyzer. The measured and simulated results are compared.Â Â Â
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