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Comptes Rendus Physique
Volume 18, n° 2
pages 125-136 (février 2017)
Doi : 10.1016/j.crhy.2016.11.008
Performance of low-power RFID tags based on modulated backscattering
Performance des tags RFID de faible puissance fondés sur la modulation d'un signal rétrodiffusé
 

Fig. 1




Fig. 1 : 

System of tags and readers.


Fig. 2




Fig. 2 : 

Measurement and detection principle in the case of multipath propagation, seen as a quadrupole.


Fig. 3




Fig. 3 : 

Example of BS signal for open and short circuits for two different tag positions.


Fig. 4




Fig. 4 : 

Comparison between the true measured signal backscattered for open-load impedance (dashed line) and that reconstructed from the transmission measurement (solid line). The direct LoS component: (a) and scattered multipath components in different time windows: (b) and (c).


Fig. 5




Fig. 5 : 

Scenario; top: room; bottom: small (left) and large (right) scenario.


Fig. 6




Fig. 6 : 

Comparison between the measured and the computed backscattering gain for a metallic can.


Fig. 7




Fig. 7 : 

Can backscattering impulse response for two different direction from the reader antenna to the metallic can. The simulated IR was synchronized with the measurement.


Fig. 8




Fig. 8 : 

Gain for the DFMS tag; reader Vivaldi antenna gain included (top) and removed (bottom).


Fig. 9




Fig. 9 : 

Gain for the DFMS tag; reader bicone antenna gain included (top) and removed (bottom).


Fig. 10




Fig. 10 : 

Relative magnitude of DFMS tag BS energy and clutter energy for the Vivaldi reader antenna.


Fig. 11




Fig. 11 : 

SCR versus reader-tag separation (Vivaldi reader antenna).


Fig. 12




Fig. 12 : 

Antenna mode for different reader antenna directionality.


Fig. 13




Fig. 13 : 

Operation modes: Monostatic (left) vs. multistatic. Right: when reader 4 transmits.


Fig. 14




Fig. 14 : 

The statistical distribution of the BS tag power seen by a vertical bicone reader.

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