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Title: Reconfigurable tri-band H-shaped antenna with frequency selectivity feature for compact wireless communication systems
Authors: AbuTarboush, HF
Nilavalan, R
Nasr, KM
Cheung, SW
Peter, T
Al-Raweshidy, H
Budimir, D
Keywords: Bluetooth;Global positioning system;Cellular radio;Microwave antennas;Multifrequency antennas;Varactors;Wireless LAN
Issue Date: 2011
Publisher: Institution of Engineering and Technology
Citation: IET Microwaves, Antennas and Propagation, 5(14): 1675 - 1682, Nov 2011
Abstract: This study presents an H-shaped reconfigurable antenna for wireless applications. The antenna consists of an H-shape radiator and a CPW printed on a circuit board and a varactor diode connecting the upper and lower arms of the H-shape radiator for reconfigurability. The uniqueness of the antenna lies on the ability to select the operating mode and frequencies electronically using a varactor diode. By selecting the DC-bias voltages of 11.5, 10 and 8 V across the varactor diode, which in turn selects the corresponding varactor capacitances of 2, 4 and 6 pF, the antenna can be controlled to operate in three different modes, namely a single-band mode to cover the GSM1900, a dual-band mode at 1.88 and 2.4 GHz to cover the GSM1900 and Bluetooth/WLAN, respectively and a tri-band mode at 1.57, 1.88 and 2.4 GHz to cover the GSM1900, WLAN and GPS, respectively. Furthermore, by varying the varactor capacitance from 7 to 13 pF, the GPS and WLAN bands can be tuned by 11.44% (1.57-1.4 GHz) and 6.46% (2.4-2.25 GHz), respectively, yet keeping the 1.88-GHz band unchanged. Detailed studies on the antenna's performance are carried out to investigate the behaviour of the antenna at each resonant frequency in each operating mode.
Description: This is the post-print version of the Article. The published version can be accessed from the link below - Copyright @ 2011 IET
ISSN: 1751-8725
Appears in Collections:Electronic and Computer Engineering
Dept of Electronic and Computer Engineering Research Papers

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