Dual Band Inverted H-Shaped Slot Monopole Antenna for WLAN Applications

A novel dual-band inverted H-shaped slot circular patch antenna is presented in this paper. A rectangular slots are initially introduced onto a circular patch antenna resulted to dual band antenna but with poor s-parameter at 5.2 GHz band. Subsequently, the antenna reflection coefficient at 5.2 GHz is improved by introducing an inverted H-shaped slot at the center of the circular patch. The antenna reflection coefficient at 2.4 GHz is improved by optimizing the circular patch diameter with value of 36 mm. Wide bandwidth and omnidirectional radiation pattern characteristics is realized by implementing partial ground plane. The proposed design exhibited return loss of -23 dB in simulation, -34 dB in measurement while -15 dB in simulation, -24 dB in measurement at 2.4 and 5.2 GHz, respectively. Hence, the proposed dual band antenna design operating at 2.4 and 5.2 GHz band frequencies can be used for wireless LAN (WLAN) applications.