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Dual-band WLAN dipole antenna using an internal matching circuit

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4 Author(s)

A dual-band dipole antenna for wireless local area network (WLAN) is designed and experimentally tested at both the 2.4 and 5 GHz (IEEE 802.11b/g and 802.11a) WLAN bands. The design procedure involves obtaining a full resonance frequency in the 2.4 GHz band and then using a matching network to achieve a secondary resonance at the 5 GHz band. It is shown that by correctly designing the dipole, the matching network can be simplified to only one series inductor. The design was experimentally verified by constructing a dipole on a FR4 board (12 mm*45 mm*0.45 mm) and measuring its input impedance and the radiation characteristics at both bands. The measured VSWR 2:1 bandwidth in the 2.4 GHz band is 710 MHz, and the bandwidth in 5 GHz band is wider than 1 GHz. The VSWR 3:1 bandwidth is more than 3.6 GHz and it covers from 2.32 GHz to above 6 GHz. It is significant that the designed dual-band dipole maintained good radiation efficiency values at both bands. Specifically, and based on the measured radiation patterns, an efficiency value of 85% ∼ 87% is obtained at 2.4 GHz and a value in the range of 55 ∼ 64% is obtained in 5 GHz band.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:53 ,  Issue: 5 )

Date of Publication:

May 2005

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