Power supply for wireless sensors systems

04.02.2019 von 17:15 bis 18:00

Wireless sensor or actuator systems, like portable phones, remote control, ID cards, or embedded wireless sensor nodes play an ever growing role in our industrialized environment. Those systems were enabled due to the steadily decreasing power consumption of high integrated ICs. Most such systems are powered by batteries or inductive coupling. In this presentation several concepts for an alternative power supply of wireless sensor or actuator systems are discussed in detail.

Batteries, although today mostly used, suffer from a limited storage capacity, which induce a labor and sometimes cost-intensive periodic maintenance, and also a problematic ecological impact. The usable range for inductive coupling systems is restricted to a distance of about the aperture of the coupling coil. UHF systems operate in the far field and reach higher distances. Their operating range is limited by the distance where the voltage at the feeding point of the antenna becomes too low to drive the rectifier circuit. Larger read out ranges become feasible by omitting the rectifier stage. In this case we need either a passive frequency modulating device to shift the read out signal to a side band, or a resonator with a high quality factor, like a SAW, BAW, or a dielectric resonator, to store the energy until all environmental echoes are fade away. For many applications, both indoor and outdoor, energy harvesting system become feasible which convert ambient power densities like light, RF fields, local or temporal thermal gradients, or mechanical vibrations into electrical supply power for the wireless system.

All those systems strongly suffer from a lack of energy. Thus new concepts for lowering the power consumption of a wireless sensor or actuator system - by keeping their performance - remain extreme important. Hereby, a wireless wake up receiver technique is presented which operates on a current requirement as low as 3 micro A.

Several application examples of the presented systems will be given, e.g., sensors for industry 4.0, indoor position sensors, inductively transmitted power to implants, and high temperature wireless sensors.


Leonhard Reindl received the Dipl. Phys. degree from the Technical University of Munich, Prof. Dr. Leonhard ReindlGermany in 1985 and the Dr. sc. techn. degree from the University of Technology Vienna, Austria in 1997. In April 1985 he joined the surface acoustics wave group of the Siemens Corporate Technology Division, Munich, Germany. At Siemens he contributed to the development of SAW convolvers, dispersive, tapped and reflective delay lines. His primary interest was in the development and application of SAW ID-tag and wireless passive SAW sensor systems. In winter 1998/99 and in summer 2000 he was invited as guest professor for spread spectrum technologies and sensor techniques at the University of Linz, Austria. In April 1999 Leo Reindl joined the Institute of Electrical Information Technology at the Clausthal University of Technology where he became lecturer for communication and microwave techniques. In May 2003 he accepted a full professor position at the Laboratory for Electrical Instrumentation at the Department of Microsystems Engineering (IMTEK), University of Freiburg, Germany. From 2014 to 2016 he served as head of the Department.

His research interests include wireless sensor systems and electronics for safe and rescue applications.
Leonhard Reindl is senior member of the IEEE and the German VDE. He contributes in the Technical Program Committees of IEEE Frequency Control, Ultrasonic, and Microwave Symposia, Eurosensors and of the German VDI/VDE Biannual Symposium "Sensoren und Messsysteme", where he served 3 times as general chairman. He also served for the European Security Research and Innovation Forum ESRIF, in the editorial board for IEEE Transactions UFFC and in the Administrative Committee AdCom for the IEEE UFFC society from 2005 to 2007 and from 2009 to 2011. Since 2014, he is serving as Editor-in-Chief for the Section 'Sensor Networks' of the open access journal Sensors. In 2019 he was appointed as evaluator for instrumentation and information systems of the AiF German Federation of Industrial Research Associations.
Leonard Reindl holds more than 40 patents on wireless passive sensors and has authored or co-authored more than 450 papers in this field.

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