The investigation of two half circular patch (HCP) antenna with defected ground structure to operate dual bands is presented in this study for wireless communications. The crescent slots etched on the HCPs are proposed to operate the dual bands of below -10 dB reflection coefficient, with the impedance bandwidth of the first band being 740 MHz (3.01-3.75 GHz) and of the second band being 7120MHz (6.74-13.86 GHz). The proposed HCP antenna was resonates of 3.36 and 12.17 GHz with -33.9 and -35.47 dB reflection coefficients. This antenna produces a maximum gain of 5.46 and 6.61 dB for these resonating frequencies, respectively. The simulation and measured radiation pattern results are also presented for proposed HCP antenna and it operates for wireless communications and internet of things applications.
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