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International 2020 Elektronik 37 Sensors ated by the reader is not only reflected by the tags but by objects in the close vicinity The reflected fields overlap the transmitted field of the reader which can lead to attenuation extinction or amplification of the field That can often result in a chaotic pattern of reflections of differing intensity that can become almost incalculable In metallic surroundings the effect is cumulative As a consequence there is not enough energy for the operation of individual RFID sensor tags and gaps appear in the heatmap To correct this sensor positions have to be altered manually and the configuration parameters adjusted for example the number of sensor nodes and antennas transmitted power data rates coding schemes scheduling mechanisms The ideal solution to the problem is entirely electromagnetic simulation of all sensor nodes and their environment But this is a timeconsuming and computeintensive process that is often in no relation to its usefulness The Fraunhofer IPMS consequently uses a tool for selfoptimizing constant operation of wireless sensor networks This tool is based on fundamental knowledge and experience from the areas of highfrequency simulation and wireless communication enabling simplified configuration and selfoptimization of sensor nodes In continuous operation too reaction is possible to dynamic changes of operating state and ambient conditions and reliable measured values are produced Development support In practice the requirements made of RFID sensor systems may vary entirely Process demands the physical environment different application materials the surrounding IT infrastructure it can all affect the functionality and use of a system Proof of concepts can be useful to verify the suitability of RFID as a basic technology for wireless sensors in different applications Here the matching hardware for the ambient conditions and conditions of use is selected and tested in ambient conditions close to those of operation to determine whether the RFID technology performs well enough for the intended purpose The Fraunhofer IPMS also offers UHF evaluation kits for tests and demonstrations These consist of a reader and different sensor transponders for random selection Matching this there is middleware to read out and display measured values MHA Dr Andreas Weder received a degree in communications engineering from the Technical University Dresden in 2006 and a doctorate for his work on wireless sensor networks in 2013 He joined Fraunhofer IPMS in 2006 where he has headed the module integration development group since 2016 andreas weder@ipms fraunhofer de to cool to protect to connect Fischer Elektronik GmbH & Co KG Nottebohmstraße 28 58511 Lüdenscheid GERMANY Telefon +49 2351 435 - 0 Telefax +49 2351 45754 E-Mail info@fischerelektronik de For more details please check our website www fischerelektronik de We exhibit Light + Buildung in Frankfurt 08 -13 03 20 hall 8 0 stand H24 Thermal conductive materials • with high longterm stability and thermal conductivity • smallest heat transfer resistances • excellent compensation of unevennesses • electrical conductive and insulating • as sheet material or rolled goods • customised cuts by means of 24 h sample delivery service