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A multiband U-slot patch antenna, with linear polarization, is designed for WiMAX and WLANsystems. The impedance bandwidths (dB) of 2.3%, 3.4%, 7.2% and 5.2% were achieved at central frequencies 3.3GHz, 3.7 GHz, 5.3 GHz and 5.8 GHz, with gains of 5 dBi, 7.3 dBi, 7.5 dBi and 8.2 dBi, respectively. The antenna isdesigned with coaxial feeding technique and the overall dimension is around 50X50 on FR4 substrate. The simulationresults of reflection coefficient, gain, radiation patterns and field distributions are carried and presented in this workwith FEM based electromagnetic tool HFSS.
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