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A novel and compact tri-band planar antenna for 2.4/5.2/5.8-GHz wirelesslocal area network (WLAN), 2.3/3.5/5.5GHz Worldwide Interoperability forMicrowave Access (WiMAX) and Bluetooth applications is proposed and studied inthis paper. The antenna comprises of a L-shaped element which is coupled with aground shorted parasitic resonator to generate three resonant modes fortri-band operation. The L-shaped element which is placed on top of thesubstrate is fed by a 50$\Omega$ microstrip feed line and is responsible forthe generation of a wide band at 5.5 GHz. The parasitic resonator is placed onthe other side of the substrate and is directly connected to the ground plane.The presence of the parasitic resonator gives rise to two additional resonantbands at 2.3 GHz and 3.5 GHz. Thus, together the two elements generate threeresonant bands to cover WLAN, WiMAX and Bluetooth bands of operation. Athorough parametric study has been performed on the antenna and it has beenfound that the three bands can be tuned by varying certain dimensions of theantenna. Hence, the same design can be used for frequencies in adjacent bandsas well with minor changes in its dimensions. Important antenna parameters suchas return loss, radiation pattern and peak gains in the operating bands havebeen studied in detail to prove that the proposed design is a promisingcandidate for the aforementioned wireless technologies.

A Novel Compact Tri-Band Antenna Design for WiMAX, WLAN and Bluetooth Applications