A novel compact and wideband coplanar waveguide(CPW)-fed monopole antenna is proposed. To increase the impedance bandwidth, one equilateral trapeziform notch and one triangular slots are added, which are optimized by parametric optimization analysis. The antenna has a wide bandwidth ranging from 2.84 to 7.28 GHz for S11<-10dB, in addition it works well and steadily between 3.46 and 6.66GHz for the S11< -20 dB.
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