Compact, Slotted, Printed Antennas for Dual-Band Communication in Future Wireless Sensor Networks

Inverted-F antennas (IFAs) are a primary choice to implement the radiating system of portable devices. A tried and tested idea can remain topical if proven useful in modern applications. This paper shows that printed IFAs (PIFAs) are capable of forming robust, compact, dual-band radiating systems fo...

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Main Authors: Constantine G. Kakoyiannis, Philip Constantinou
Format: Article
Language:English
Published: Hindawi Limited 2013-01-01
Series:International Journal of Antennas and Propagation
Online Access:http://dx.doi.org/10.1155/2013/873234
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spelling doaj-69323347f4d94b5f81d3c471352395e72020-11-24T22:48:59ZengHindawi LimitedInternational Journal of Antennas and Propagation1687-58691687-58772013-01-01201310.1155/2013/873234873234Compact, Slotted, Printed Antennas for Dual-Band Communication in Future Wireless Sensor NetworksConstantine G. Kakoyiannis0Philip Constantinou1Mobile Radio Communications Laboratory, National Technical University of Athens, Zographos Polytechnic Campus, 9 Iroon Polytechniou Street, 15773 Athens, GreeceMobile Radio Communications Laboratory, National Technical University of Athens, Zographos Polytechnic Campus, 9 Iroon Polytechniou Street, 15773 Athens, GreeceInverted-F antennas (IFAs) are a primary choice to implement the radiating system of portable devices. A tried and tested idea can remain topical if proven useful in modern applications. This paper shows that printed IFAs (PIFAs) are capable of forming robust, compact, dual-band radiating systems for wireless microsensors with an adjustable spacing between bands. Reactive tuning was applied by inductively loading the structures with prefractal slots; inductive slot loading degenerates higher-order resonances and increases the fractional bandwidth (FBW). The current distributions revealed that most of the element area is used for radiation at both resonances. In radiation terms, the antennas provide satisfactory gains and high efficiencies (≥82%). A simple figure of merit is used to compare the performance of the three PIFAs head to head. Operation at 2.5 GHz and 5.5 GHz indicated that changes in slot geometry almost double the FBW. The proposed antennas serve both the 5.15–5.35 GHz U-NII and the 5.8 GHz ISM bands; at the lower band, their size is less or equal to the half-wavelength dipole. This study of dual-band antennas also showed that the aggregate FBW of a PIFA is bounded; by degenerating higher-order modes, the designer redistributes whatever bandwidth is available by the antenna itself to the desired bands.http://dx.doi.org/10.1155/2013/873234
collection DOAJ
language English
format Article
sources DOAJ
author Constantine G. Kakoyiannis
Philip Constantinou
spellingShingle Constantine G. Kakoyiannis
Philip Constantinou
Compact, Slotted, Printed Antennas for Dual-Band Communication in Future Wireless Sensor Networks
International Journal of Antennas and Propagation
author_facet Constantine G. Kakoyiannis
Philip Constantinou
author_sort Constantine G. Kakoyiannis
title Compact, Slotted, Printed Antennas for Dual-Band Communication in Future Wireless Sensor Networks
title_short Compact, Slotted, Printed Antennas for Dual-Band Communication in Future Wireless Sensor Networks
title_full Compact, Slotted, Printed Antennas for Dual-Band Communication in Future Wireless Sensor Networks
title_fullStr Compact, Slotted, Printed Antennas for Dual-Band Communication in Future Wireless Sensor Networks
title_full_unstemmed Compact, Slotted, Printed Antennas for Dual-Band Communication in Future Wireless Sensor Networks
title_sort compact, slotted, printed antennas for dual-band communication in future wireless sensor networks
publisher Hindawi Limited
series International Journal of Antennas and Propagation
issn 1687-5869
1687-5877
publishDate 2013-01-01
description Inverted-F antennas (IFAs) are a primary choice to implement the radiating system of portable devices. A tried and tested idea can remain topical if proven useful in modern applications. This paper shows that printed IFAs (PIFAs) are capable of forming robust, compact, dual-band radiating systems for wireless microsensors with an adjustable spacing between bands. Reactive tuning was applied by inductively loading the structures with prefractal slots; inductive slot loading degenerates higher-order resonances and increases the fractional bandwidth (FBW). The current distributions revealed that most of the element area is used for radiation at both resonances. In radiation terms, the antennas provide satisfactory gains and high efficiencies (≥82%). A simple figure of merit is used to compare the performance of the three PIFAs head to head. Operation at 2.5 GHz and 5.5 GHz indicated that changes in slot geometry almost double the FBW. The proposed antennas serve both the 5.15–5.35 GHz U-NII and the 5.8 GHz ISM bands; at the lower band, their size is less or equal to the half-wavelength dipole. This study of dual-band antennas also showed that the aggregate FBW of a PIFA is bounded; by degenerating higher-order modes, the designer redistributes whatever bandwidth is available by the antenna itself to the desired bands.
url http://dx.doi.org/10.1155/2013/873234
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