Bandwidth enhancement, radiation properties and ground-dependent response of slotted antennas integrated into wireless sensors

Kakoyiannis, CG; Kyrligkitsi, A; Constantinou, P

dc.contributor.author	Kakoyiannis, CG	en
dc.contributor.author	Kyrligkitsi, A	en
dc.contributor.author	Constantinou, P	en
dc.date.accessioned	2014-03-01T01:32:56Z
dc.date.available	2014-03-01T01:32:56Z
dc.date.issued	2010	en
dc.identifier.issn	1751-8725	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20240
dc.subject	Slot Antenna	en
dc.subject	Wireless Sensor	en
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.classification	Telecommunications	en
dc.subject.other	Antenna configurations	en
dc.subject.other	Antenna performance	en
dc.subject.other	Bandwidth enhancement	en
dc.subject.other	Baseline configurations	en
dc.subject.other	Characterisation	en
dc.subject.other	Design specification	en
dc.subject.other	Figure of merit	en
dc.subject.other	Fractional bandwidths	en
dc.subject.other	GHz band	en
dc.subject.other	Ground plane size	en
dc.subject.other	Ground planes	en
dc.subject.other	High data rate wireless	en
dc.subject.other	Integral part	en
dc.subject.other	Performance comparison	en
dc.subject.other	Portable device	en
dc.subject.other	Printed inverted-F antenna	en
dc.subject.other	Radiation properties	en
dc.subject.other	Resonant mode	en
dc.subject.other	RF ground	en
dc.subject.other	Total efficiency	en
dc.subject.other	Wide-band	en
dc.subject.other	Wireless sensor	en
dc.subject.other	Antenna grounds	en
dc.subject.other	Bandwidth	en
dc.subject.other	Sensors	en
dc.subject.other	Antennas	en
dc.title	Bandwidth enhancement, radiation properties and ground-dependent response of slotted antennas integrated into wireless sensors	en
heal.type	journalArticle	en
heal.identifier.primary	10.1049/iet-map.2009.0321	en
heal.identifier.secondary	http://dx.doi.org/10.1049/iet-map.2009.0321	en
heal.identifier.secondary	IMAPCH000004000005000609000001	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	The design of low-cost, wideband, printed inverted-F antennas (PIFAs) that are suitable for portable devices operating at the 2-3-GHz band is described. The design specifications were extracted according to the constraints of high data rate wireless sensor devices. Reactive tuning through slot loading was applied to enforce degeneration of a higher resonance, and thus double the bandwidth in the band of interest. Three slotted antenna configurations are reported plus a baseline configuration; a thorough numerical characterisation of performance is provided. Fractional bandwidth (FBW) in the range 22-34% was achieved, which is almost quadruple that of existing implementations. The antennas exhibit total efficiencies around 80% and are elliptically polarised. A suitable figure-of-merit is suggested for performance comparisons; it attempts to capture overall antenna performance in a single quantity. Antenna performance depends heavily on electrical size, which depends on the size of the ground plane, since the RF ground is an integral part of the total radiator. The ground-effect study showed that wrong choice of size can force resonant modes to vanish. Best performance for a slotted PIFA was obtained with a ground plane measuring 0.20λ×0.28λ, significantly smaller than predicted in prior studies. Bandwidth augmentation through slot loading is supported by measurements. Fabricated antennas with sub-optimal ground plane sizes exhibit FBWs in the range 20-23%. © 2010 © The Institution of Engineering and Technology.	en
heal.publisher	INST ENGINEERING TECHNOLOGY-IET	en
heal.journalName	IET Microwaves, Antennas and Propagation	en
dc.identifier.doi	10.1049/iet-map.2009.0321	en
dc.identifier.isi	ISI:000279253600007	en
dc.identifier.volume	4	en
dc.identifier.issue	5	en
dc.identifier.spage	609	en
dc.identifier.epage	628	en