Periodic Reporting for period 3 - SCATTERERID (Analysis and synthesis of wideband scattered signals from finite-size targets – aspect-independent RF analog footprint)
Periodo di rendicontazione: 2021-09-01 al 2023-02-28
- A novel methodology for achieving a variable resistance for CBRAM cells for microwave applications has been introduced.
- Electronically rewritable chipless RFID tags have been designed, fabricated through thermal transfer printing on flexible PET substrates and characterized.
- A smart and robust chipless RFID label with identification and touch sensing capabilities has been developed.
- We have shown that contactless characterization of thermal expansion coefficient (CTE) of metals can be realized based on free-space RF measurements. This concept has also been used to convert chipless tags to temperature and humidity sensors.
- We have introduced a new RF approach to Wirelessly Detect Surface Modification of Silicon Nanowires. We have seen the possibility to detect the presence of grafted molecules on the surface of silicon nanowires with a wireless RF radar approach based on the measurement of the backscattered signal of a resonant structure on which the nanowires are deposited.
- We have work on the idea of “Optimal Angle in Bistatic Measurement for Chipless Tag Detection Improvement”. We have shown that the use of a bistatic reading configuration by optimizing the angle between the two antennas can enhance the reading performance of the chipless tag for short-range applications.
- A significant work has been done on a new topic about “Motion-Modulated Chipless RFID”. Motion-modulated chipless RFID is presented as an effective backscatter communication method for identification and sensing of moving objects at large distances.
We have introduced the concept of “Directional amplitude backscatter modulation with suppressed Doppler based on rotating resonant Loop”. The presented backscattering modulation technique provides an amplitude modulating waveform which is uniquely linked to the directional reradiation pattern of the rotating loop scatterer in a definite resonant mode.
A test bench has been built and automated to perform chipless tag characterization. It is now possible to measure the RCS of objects in 3D.
As regards the topic of modulation by motion, the expected results are also very important for achieving the objectives of task 5. We will be able to show in very concrete applications the increase in reading distance (factor 30) as well as the use of this principle to monitor sensor information (application to measure breathing, vibration frequency, etc.). Ongoing work has shown that it is possible to significantly increase the DeltaRCS and therefore the reading distance by modifying the topology of the chipless tag. This reading topic was introduced during the project, so we are the first team to work on it and will publish several articles which we hope will become reference articles on the subject.
Expected results until the end of the project are still the ones described in the Annex 1 to the Grant Agreement (Description of the Action).