Brazil 2014ugm Optically Reconfigurable Rfid Resonator

8/10/2019 Brazil 2014ugm Optically Reconfigurable Rfid Resonator

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Optically Reconfigurable RFID Resonator

Andreia AlvesProf Dr. Leonardo BravoProf Dr. Francisco Arnold


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FT : Faculdade de Tecnologia da Unicamp

Undergraduate Courses

Analysis and Systems DevelopmentBachelor on Information SystemsBuildings ConstructionEnvironmental ControlEnvironmental EngineeringTelecommunication EngineeringRoadsEnvironmental SanitationTelecommunication Systems

Research Lines

Concentration Area: Materials ScienceConcentration Area: Information and Communication SystemsConcentration Area: Environment


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CCS : Centro de Componentes Semicondutores ( Center forSemiconductor Components )

The Center for Semiconductor Components, CCS, is a multidisciplinary center, with emphasis onnanoelectronics, nanophotonics and microelectronics. In addition to the research in nano andmicrofabrication techniques, it also promotes a teaching enviroment for undergraduate, graduatestudents and external insitituitions. Its facilities are open for industry and research both at graduate andundergraduate level. CCS also provide services contract to other groups at UNICAMP as well as externalinstitutions

Micro and Nano Electrical Mechanical Systems


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RFID System : Radio -f requency Ident i f ica t ion

Font: http://www.computerdos.es/soluciones/mobility/mobilityRFID.html

RFID Advantages

No line-of-sight contact necessarySpeed of an RFID systemRobust systemBidirectional communication

Reliability in tough environments

The Different Types of RFID Systems

Passive RFID

Active RFIDSemi-Passive RFID


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Active RFID - Ch ip less RFID Tag Desig n -

Disadvantages of Active RFID tags vs Passive RFID tags

Size : Active RFID tags are generally larger than their passive counterparts

Font: http://brasil.rfidjournal.com/noticias/vision?11387 Photograph of the UWB 35-bit chipless RFID tag

Soluc t ion : reconfigurable RFID tags


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Layout of a spiral resonator (2.5GHz)

Line with characteristicimpedance of 50;

Substrate Taconic TLX-0 , withdieletric constant of 2.55 andloss tangent of 0.0019.

Resonator's geometricdimensions :

W1=5.2mm, W2=2.26mm,W3=0.8mm, W4=0.2mm,W5= 0.3mm, s1=8.15mm.

Variation of the spiral resonantfrequency with spiral length: S1


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Frequency response of the ressonantresonator


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Spiral resonator in non-resonant state

To represent the bit 1 using the same resonator, is necessary remove theresonant state or move the frequency response out of the operationfrequency band


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Frequency response of the non-resonantresonator


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Silicon Switch- Software Designer

Theoric Model for the Silicon Switch Photoconductive switches are activated by a laser on the wavelength

and light power proper to configure

Circuital Model for the switch using Designer


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Silicon switch illuminated by the laser


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Silicon switch without illumination


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Goals

The silicon switch was placed at a strategic place on theresonator and its frequency response was tested for the twooperation modes: ON (with the laser turned on) and OFF(with the laser turned off) mode

Silicon Switch - Lumped RLC


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Resonator on ON mode


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Resonator on OFF mode


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Tolerance tests

Random variation of the RLC parameters with 10% tolerance


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Conclusion and next steps

A new optically reconfigurable resonator design waspresented

Accurate and rigorous electromagnetic simulations usingHFSS 15.0 software made it possible to predict the behaviorof the reconfigurable resonator and validate the proposedtechnique

Next steps : optically reconfigurable tag construction,assembly and test


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Acknolodegements

Thanks for your attention!

Andreia Ap. de Castro [email protected]

To Prof. Dr. Leonardo L. B. RogerTo Igor Feliciano da Costa

Brazil 2014ugm Optically Reconfigurable Rfid Resonator

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