Rectangular slot antenna with bobbin shaped stub tuning for wireless communication application

This article presents rectangular slot antenna for wireless communication application by adding bobbin-shaped stub tuning in the rectangular slot to enlarge used bandwidth of antenna for supporting wide frequency in GSM850/900, DCS, PCS, UMTS, IMT, Bluetooth, WLAN and WiMAX systems. The prototype antenna has bandwidth of 116.41% (2.24 - 8.48 GHz) under the condition of return loss less than -10 dB and input impedance close to 50Ω. The antenna structure are fabricated on FR4 substrate with overall size 32 × 36 mm
²
. The proposed antenna is compact and suitable for bi-directional at 2.45 GHz, 3.5 GHz, and 5.2 GHz (wireless communication application). The average gain along radiation direction are 4.03 dBi for 2.5 - 6 GHz. Finally, the comparison of the measurement and simulation results were performed in the same direction.