Hilton, GS

Jayatissa, Chathura

Paul, DL

Railton, CJ

English

Dominique L. Paul

Chathura Jayatissa

Geoffrey S. Hilton

Chris J. Railton

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Conformability of a textile antenna for reception of digital television

The paper explores the sensitivity of a wide band UHF textile antenna for reception of digital television and discusses the performance of the antenna when submitted to curvature or the presence of the body. Despite dimensions that are somewhat large for a human body, the study shows that the antenna performs well in curved situations, showing little change in return loss when crumpled, rolled, and worn on chest and arm. The antenna is also robust to changes in thickness and permittivity of the substrate, which is an advantage as the same design could potentially be directly applied to a range of textile materials with only minor modifications to the original design.The paper explores the sensitivity of a wide band UHF textile antenna for reception of digital television and discusses the performance of the antenna when submitted to curvature or the presence of the body. Despite dimensions that are somewhat large for a human body, the study shows that the antenna performs well in curved situations, showing little change in return loss when crumpled, rolled, and worn on chest and arm. The antenna is also robust to changes in thickness and permittivity of the substrate, which is an advantage as the same design could potentially be directly applied to a range of textile materials with only minor modifications to the original design

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                          Paul, D. L., Jayatissa, C., Hilton, G. S., & Railton, C. J. (2010).Conformability of a textile antenna for reception of digital television. InLoughborought Antennas and Propagation Conference (LAPC) 2010,Loughborough. (pp. 225 - 228). Institute of Electrical and ElectronicsEngineers (IEEE). 10.1109/LAPC.2010.5666168Link to published version (if available):10.1109/LAPC.2010.5666168Link to publication record in Explore Bristol ResearchPDF-documentUniversity of Bristol - Explore Bristol ResearchGeneral rightsThis document is made available in accordance with publisher policies. Please cite only the publishedversion using the reference above. Full terms of use are available:http://www.bristol.ac.uk/pure/about/ebr-terms.htmlTake down policyExplore Bristol Research is a digital archive and the intention is that deposited content should not beremoved. However, if you believe that this version of the work breaches copyright law please contactopen-access@bristol.ac.uk and include the following information in your message:• Your contact details• Bibliographic details for the item, including a URL• An outline of the nature of the complaintOn receipt of your message the Open Access Team will immediately investigate your claim, make aninitial judgement of the validity of the claim and, where appropriate, withdraw the item in questionfrom public view.Centre for Communications ResearchConformability of a textile antenna for reception of digital televisionDominique L. Paul, Chathura Jayatissa, Geoffrey S. Hilton, Chris J. RailtonCentre for Communication Research, Department of Electrical and Electronic Engineering,University of Bristol, Woodland Road, Bristol, BS8 1UB, UKAbstract – The performance of a wide band UHF textile antenna for reception of digital television is enhanced by means of a parametric study using FDTD and robustness to variations in substrate height and permittivity is observed.  Despite dimensions that are somewhat large for a human body, measurements of the antenna under curvature and in the presence of the body show that the antenna is robust to deformations, showing little change in input response when crumpled, rolled or worn on the chest and arm.MotivationParametric study of initial DTV antennaPerformance of new wideband DTV antennaConclusion• Textile antennas are widely developed for wearable applications as they are light weight, inherently conformal to the human body and comfortable to wear• Mostly proposed for RF frequencies from 2.45 GHz to 10 GHz• Only very few narrow-band textile antennas exist in the UHF band and below• Digital television (DTV) antennas are emerging for laptops and portable media players but only one prototype proposed to receive television on textiles [1]• Textile DTV antenna, using felt and high performance conductive textile, showed a wide bandwidth of 76% (376 MHz-843 MHz) covering DTV band in operation in most countries worldwide with good radiation patterns• Ground plane dimensions were found to have a large influence on the bandwidth • Antenna is robust to variations in substrate height and permittivity, hence the same design could potentially be applied to other textiles• Performance maintained when bent, wrapped, worn on chest or rolled around the arm[1] K. Furuya, Y. Taira, H. Iwasaki, S. Yamamoto, N. Tamaki, T. Harada, A. Kuramoto, “Wide Band Wearable Antenna for DTV Reception”, in Proc. IEEE-Ant. & Propagat. Soc. Int. Symp., AP-S, 2008Acknowledgement: The authors wish to thank Dr. Robert Clarke and Dr. Kevin Lees from the National Physical Laboratory, Teddington, UK for their invaluable contribution in the dielectric measurement of the felt used in this project. 21 3456789Conductive surface (Nora)Felt substrateAntenna response is robust to substrate thickness variationsVariations of substrate permittivity show that the design with felt could readily be translated to other textiles 7.5 cm8.5 cm1 cm3.5 cm6.5 cm7.5 cm5 cm10 cm1.5 cm3.5 cm4.5 cm1.5 cm1 cm25 cm 00.511.522.533.540.3 0.4 0.5 0.6 0.7 0.8 0.9 1VSWRFrequency (GHz)antenna measured [1]antenna simulated [1]proposed antenna simulatedproposed antenna measuredInfluence of the width of block 4: match is affected but not bandwidth(optimum: 15 cm)Parasitic element had most influence on rise in reflection at 750 MHz hence on bandwidth(optimum width for blocks 6 and 8: 3.5 cm as in [1])Influence of the height of block 2(optimum: 10 cm)The width of blocks 1 and 3 had a marked effect on the bandwidth (optimum: 7.5 cm)Front view of Digital Television antenna in [1]FDTD snapshot showed that the field normal to antenna plane is concentrated near the edges  Optimised Digital Television antenna (Felt: thickness: 1.21 mm; dielectric constant: 1.288; loss tangent: 0.0366) All parts of the ground plane were found to have a major influence on the responseInfluence of the width of block 2(optimum: 33 cm)Input response of new DTV antenna showing enhanced bandwidth of 76%:(376-843 MHz  as opposed to 470-770 MHz in [1]) Radiation patterns of new DTV antenna are in good agreement with those from [1]Measured input response of the DTV antenna remained satisfactory when worn on chest and armMeasurements of the DTV antenna when bent or rolled showed that the input response was little affected by strong curvature It was observed by simulation that the match could be improved by several dB when the height of blocks 1 and 3 was reduced from 10 to 5 cm 

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Conformability of a textile antenna for reception of digital television

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