Design of Bandwidth Enhancement CPW-Fed Slot Antennas

A multi-band coplanar waveguide (CPW)-fed slot antenna design for wireless/mobile communication applications is proposed. This antenna is designed on single-layer PCB FR4 substrate with permittivity er = 4.4, loss tangent tanδ = 0.0245, and thickness h = 1.6mm. The antenna consists of T-shaped signal strip and U-shaped conducting strip in the upper side of T-shaped signal strip. With the simple tuning slot parameters of the ground plane, the proposed antenna is suitable for WLAN 2.4/5.2/5.8, WiMAX 2.5/3.5/5.5, and WCDMA 1.92-2.17 GHz operations. The -10 dB bandwidth of the proposed antennas from measurement is about 109.2% (1.85-6.3GHz). The bandwidth enhancement is obtained by choosing suitable combinations of the upper and the lower ground slots. The elaborate analysis of geometrical parameters has been studied to optimize the performance of the designed antennas. The results for return loss, far-field H- and E-plane radiation patterns, gain, and radiation efficiency of the proposed antennas are presented and discussed. The antenna size of radiation area and ground plane is 50×50mm^2. The detailed simulation and experiment are investigated to optimize for broadband operation. The measured results show a good agreement with the simulated results.