Reconfigurable tri-band H-shaped antenna with frequency selectivity feature for compact wireless communication systems

AbuTarboush, Hattan F. and Nilavalan, R. and Cheung, S.W. and Nasr, K.M. and Peter, T. and Al-Raweshidy, H.S. and Budimir, Djuradj (2011) Reconfigurable tri-band H-shaped antenna with frequency selectivity feature for compact wireless communication systems. IET Microwaves, Antennas & Propagation, 5 (14). pp. 1675-1682. ISSN 1751-8725

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Official URL: http://dx.doi.org/10.1049/iet-map.2010.0518

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.

Item Type: Article
Subjects: University of Westminster > Science and Technology > Electronics and Computer Science, School of (No longer in use)
Depositing User: Miss Nina Watts
Date Deposited: 24 Aug 2011 17:37
Last Modified: 30 Apr 2012 12:32
URI: http://westminsterresearch.wmin.ac.uk/id/eprint/9628

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