An internal multiband inverted-F antenna for mobile devices

This letter presents a design of multiband inverted-F antenna which integrated GSM, 3.5G, WLAN and WiMAX into a single one. The proposed antenna comprised a dual-band main inverted-F resonator and two parasitic elements. This compact antenna operates in GSM900, DCS, PCS, UMTS, Bluetooth/WLAN, WiMAX, HiperLAN/2 and IEEE 802.11a, with return loss better than −6 dB. The wide bandwidth was achieved by just using the capacitive-coupled parasitic element. Simulation was performed here by HFSS to optimally design the antenna and the practical structure was also fabricated to verify the simulation results. The measured antenna parameters as well as radiation efficiency are presented to validate the proposed antenna.