Publication list Dario Grgic

• Journal Articles
• Book chapters
• Conference papers

Journal Articles

 back to the top of all publications

2012

• A. Nimo, D. Grgic, L.M. Reindl
  Optimization of Passive Low Power Wireless Electromagnetic Energy Harvesters
  2012 Sensors 2012, volume: 12, issue: 1, pages: 13636 - 13663.
  » show abstract« hide abstract
  Abstract

  This work presents the optimization of antenna captured low power radio frequency (RF) to direct current (DC) power converters using Schottky diodes for powering remote wireless sensors. Linearized models using scattering parameters show that an antenna and a matched diode rectifier can be described as a form of coupled resonator with different individual resonator properties. The analytical models show that the maximum voltage gain of the coupled resonators is mainly related to the antenna, diode and load (remote sensor) resistances at matched conditions or resonance. The analytical models were verified with experimental results. Different passive wireless RF power harvesters offering high selectivity, broadband response and high voltage sensitivity are presented. Measured results show that with an optimal resistance of antenna and diode, it is possible to achieve high RF to DC voltage sensitivity of 0.5 V and efficiency of 20% at −30 dBm antenna input power. Additionally, a wireless harvester (rectenna) is built and tested for receiving range performance.

Book chapters

 back to the top of all publications

2016

• D. Grgic, S. Böttcher, M. Pfeifer, J. Scherle, B. Völker, J. Burchard, S. Sester, L.M. Reindl
  Advanced Projects and Applications for Embedded Systems Engineering on E2LP Platform
  In: Embedded Engineering Education
  2016, Springer Verlag, pages: 119 - 132,
  » show abstract« hide abstract
  Abstract

  The E2LP-Platform is capable to impart many different fields of learning content. Starting from simple, short exercises also complex projects can be realized covering up to several weeks of workload. This work presents a documentation of four students projects developed and performed at University of Freiburg in the Advanced Embedded System Laboratory. This laboratory contains a dynamic classroom approach in which the required laboratory hardware is mobile. Exploring real-wold challenges and problems motivates the participants to acquire a deeper knowledge.

Conference papers

 back to the top of all publications

2013

• A. Nimo, D. Grgic, T. Ungan, L. M. Reindl
  A new family of passive wireless RF harvesters based on R-C-Quartz oscillators
  2013 43nd European Microwave Conference (EuMC), Nürnberg , pages: 511 - 514

2012

• A. Nimo, D. Grgic, L.M. Reindl
  Ambient Electromagnetic wireless energy harvesting using multiband planar antenna, Systems, Signals and Devices (SSD)
  2012 9th International Multi-Conference , pages: 1 - 6
• A. Nimo, D. Grgic, L.M. Reindl
  Impedance optimization of wireless electromagnetic energy harvesters for maximum output efficiency at µW input power
  2012 Active and Passive Smart Structures and Integrated Systems 2012, volume: 8341
  » show abstract« hide abstract
  Abstract

  This work presents the optimization of radio frequency (RF) to direct current (DC) circuits using Schottky diodes forremote wireless energy harvesting applications. Since different applications require different wireless RF to DC circuits, RF harvesters are presented for different applications. Analytical parameters influencing the sensitivity and efficiency of the circuits are presented. Results showed in this report are analytical, simulated and measured. The presented circuits operate around the frequency 434 MHz. The result of an L-matched RF to DC circuit operates at a maximum efficiency of 27 % at-35 dBm input. The result of a voltage multiplier achieves an open circuit voltage of 6 V at 0 dBm input. Theresult of a broadband circuit with a frequency band of 300 MHz, achieves an average efficiency of 5 % at -30 dBm and open circuit voltage of 47 mV. A high quality factor (Q) circuit is also realized with a PI network matching for narrow band applications.

2011

• A. Nimo, D. Grgic, L.M. Reindl
  Electrically small Planner Antenna for Compact Electromagnetic (EM) Wireless energy harvester
  2011 Proc. Power MEMS 2011, pages: 310 - 313
  » show abstract« hide abstract
  Abstract

  This work presents the optimization of antenna captured low power radio frequency (RF) to direct current (DC) power converters using Schottky diodes for powering remote wireless sensors. Linearized models using scattering parameters show that an antenna and a matched diode rectifier can be described as a form of coupled resonator with different individual resonator properties. The analytical models show that the maximum voltage gain of the coupled resonators is mainly related to the antenna, diode and load (remote sensor) resistances at matched conditions or resonance. The analytical models were verified with experimental results. Different passive wireless RF power harvesters offering high selectivity, broadband response and high voltage sensitivity are presented. Measured results show that with an optimal resistance of antenna and diode, it is possible to achieve high RF to DC voltage sensitivity of 0.5 V and efficiency of 20% at −30 dBm antenna input power. Additionally, a wireless harvester (rectenna) is built and tested for receiving range performance.

2009

• D. Grgić, T. Ungan, M. Kostić, L.M. Reindl
  Ultra-low input voltage DC–DC converter for micro energy harvesting
  2009 Proceedings of PowerMEMS , pages: 265 - 268
  
   
  Download file as PDF