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This paper presents a novel Thin-Film wideband right angle slot antenna for WLAN, WiMAX and 3G applications. This antenna is printed on Mylar® Polyester Film substrate with size of 12.75×15 mm 2 , and thickness of 0.4 mm, and dielectric constant of 3.2. The proposed antenna is designed by using IE3D simulation software. This antenna is simple to design using four right angle slot size at appropriate position to achieve wideband which can control the desirable resonant frequency. The length of slot is approximately a half-wavelength at the desirable center frequency. The antenna operated in the frequency range 2.02 -3.04 GHz with impedance bandwidth are 1.02 GHz (Return loss < -10 dB) working in the 3G (2.1 GHz), WLAN (2.4-2.5 GHz), WiMAX (2.3-2.7 GHz).