Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Parameterization of bent coils on curved flexible surface substrates for RFID applications
 Institute of Electrical and Electronics Engineers IEEE: IEEE 59th Electronic Components and Technology Conference, ECTC 2009. Vol.1 : San Diego, CA, USA, 26  29 May 2009 New York, NY: IEEE, 2009 ISBN: 9781424444755 S.502507 
 Electronic Components and Technology Conference (ECTC) <59, 2009, San Diego/Calif.> 

 Englisch 
 Konferenzbeitrag 
 Fraunhofer IZM () 
Abstract
The readrange of passive inductivelycoupled high frequency RFID tags is strongly dependent on the inductance of the antennacoils. Inductance calculations, whether numerical or analytical, are significantly complicated when the antennacoil is not planar, but used in a bent state. This latter form of application has been made possible by the development of flexible substrates. A parameterization of the inductance in terms of its geometrical parameters including the bend radius would be advantageous. Therefore, in this work, we demonstrate the possibility of using the Response Surface Method (RSM) based on a suitable Design of Experiment (DOE) to derive a closedform expression for calculating the inductance of a bent antennacoil for a given design space. For the regression, we apply a combined approach which could be termed "Physics plus Taylor". In deriving the formula we exploit physical insight to reduce the number of unknown fitting coefficients. For the DOE we implement a socalled spacefilling design based on a threelevel full factorial design to derive the unknown coefficients. We reach an approximation equation for the inductance with a squared correlation coefficient r(2) of about 99.97% and an accuracy which is consistently better than 3%.