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Christian Doppler Laboratory for Design Methodology of Signal Processing Algorithms www.nt.tuwien.ac.at/cdlab Vienna University of Technology www.tuwien.ac.at Institute of Communications and Radio-Frequency Engineering Gußhausstrasse 25/389 Vienna, 1040 Austria www.nt.tuwien.ac.at Robert Langwieser, Michael Fischer and Prof. Dr. Arpad L. Scholtz EEEfCOM 2008, Ulm RFID Reader Frontends for a Dual-Frequency (13 MHz and 868 MHz) Rapid Prototyping Environment

RFID Reader Frontends for a Dual-Frequency (13 MHz and ...R&S SMU200A IQ tag Tx IN (13.56MHz) R&S SMY01 HP8642B LO1, -5 dBm LO1, -5 dBm LO2, 0 dBm LO2, 0 dBm CC OUT CC IN Tx OUT 866.5

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Text of RFID Reader Frontends for a Dual-Frequency (13 MHz and ...R&S SMU200A IQ tag Tx IN (13.56MHz) R&S...

  • Christian Doppler Laboratory for Design Methodology of Signal Processing Algorithmswww.nt.tuwien.ac.at/cdlab

    Vienna University of Technologywww.tuwien.ac.at

    Institute of Communications andRadio-Frequency EngineeringGußhausstrasse 25/389Vienna, 1040Austriawww.nt.tuwien.ac.at

    Robert Langwieser,Michael Fischer andProf. Dr. Arpad L. Scholtz

    EEEfCOM 2008, Ulm

    RFID Reader Frontends for a Dual-Frequency (13 MHz and 868 MHz)

    Rapid Prototyping Environment

  • 2Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Outline

    • Reader – Tag Communication• Analog Frontends for Rapid

    Prototyping Environments• HF-Frontend• UHF-Frontend

  • 3Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Reader – Tag Communication

    • Tag is powered by the reader • Energy transfer from reader to tag during the

    entire communication• Energy transfer happens at the carrier

    frequency of the data signal• Cross talk from transmitter to receiver at the

    reader

    RFID Reader

    Passive Tag

    Energy

    DataData

  • 4Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Analog Frontends for a Rapid Prototyping Environment

    • As much functionality as possible should be realized by the digital baseband

    • Frequency conversion, filtering and amplification are the tasks of the RF-frontend

  • 5Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    HF-Frontend: Requirements

    • Frequency: 13.56MHz• Communication range: a few centimeters • Inductive coupling between reader and tag • Load modulation• HF-power of 1 W• Interface with the DSP-hardware

    • frequency: 13.56MHz• power levels: determined by ADCs and DACs

    • Carrier to sideband ratio improvement

  • 6Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    HF-Frontend:Carrier Suppression Principle

  • 7Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    HF-Frontend with Tag-Emulator

  • 8Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    HF-Frontend: Verification

    • Laboratory setup with tag-emulator• Optimal tuning• Modulation signal enhanced by 34 dB

    Coil Voltage

    Output Voltage

  • 9Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Measurement with Commercial Tag

    Transmit coil voltage

    Carrier-suppressed output voltage of the HF-Frontend

    Distance between tag and transmit coil d = 24 mmMagnetic field at tag position (without Tag) H = 2.4 A/m

  • 10Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    UHF-Frontend

    • Requirements• Rx/Tx crosstalk

    • Antenna configurations• Active Rx/Tx decoupling

    • Frontend concept• Verification measurement

  • 11Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Requirements

    • Frequency: 865MHz - 868MHz• Communication range: up to 10m• 2 Watt linear output power• Interface with the DSP-hardware

    • frequency: 867MHz not directly possiblefrequency conversion necessary

    • power level: determined by ADCs and DACs

    • Carrier to sideband ratio improvement (carrier suppression)

  • 12Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Separate Rx/Tx Antenna

    Rx/Tx isolation: 30 to 40 dB

    two antennas

    Rx/Tx isolation depends on: -antenna spacing -antenna radiation pattern

    cou

    pli

    ng

  • 13Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Single Rx/Tx Antenna

    Rx/Tx isolation: 20 to 30 dB

    single antenna

    Rx/Tx isolation depends on:-circulator -return loss of antenna

    circulator insertion loss: 0.4 – 1 dB

  • 14Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Active Rx/Tx Decoupling

    coupling 2

    0dB

    +13dBm-27dBm

    S21S21

    S21

    S21

    Tx

    Rx

    (+33dBm)

    I-CTRL

    Q-CTRL

    Coupler

    Coupler

    Vector Modulator

    Amp.

  • 15Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    UHF Reader Frontend

  • 16Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    UHF Transmitter

    Tx In13.56 MHz

    LO1 In153 MHz

    LO2 In1006 MHz

    Ext. PA Out868 MHz

    To CCU868 MHz

    Power Supply,Control Lines

    Tx Ant.868 MHz

    Ext. PA In868 MHz

    To CCU868 MHz

  • 17Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Measurement Setup

    4-W

    ay

    Splitt

    er

    Transmitter

    4-

    Way

    Splitt

    er

    Receiver

    LeCroy 204Xi

    TunerCarrierComp.

    Demod. OUT

    Rx OUT (13.56MHz)

    R&S SMU200A

    IQ

    tag

    Tx IN (13.56MHz)

    R&S SMY01

    HP8642B

    LO1, -5 dBm

    LO1, -5 dBm

    LO2, 0 dBm

    LO2, 0 dBm

    CC OUT

    CC IN

    Tx OUT866.5 MHz

    Rx IN866.5 MHz

    LO1

    LO2 ZMSC-4-3 ZB4PD1-2000

    Mini-Cir. Mini-Cir.

    Mini-Cir.

    Raditek

    RC-860-900M

    ZHL-2-12

    power meter

    Agilent E4416A

    Trigger

    SMA4242-10

    -10 dB

    153.56 MHz

    1005 MHz – 1008MHz

    3 m Cable

    d

    -20 dB

  • 18Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Scenario: Corridor 5th Floor

    Power amplifier: Pout = 33.4 dBm

    Losses (cable, coupler..): 2.75 dB

    Antenna gain: ~5 dBi (~ 2.85 dBd)

    Transmit power: ~ 33 dBm ERP

  • 19Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Received Tag Answer

    Screenshot at maximum communication range of ~11m

  • 20Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Summary

    • Frontends for Rapid Prototyping

    • Current implementations for RFID

    • HF-Frontend• Rx/Tx decoupling (34 dB carrier suppression achieved)

    • Measurements

    • UHF-Frontend• Rx/Tx decoupling (antenna configuration, vector modulator)

    • Concept and verification(~11m comunication distance achieved)

  • 21Christian Doppler Laboratory for

    Design Methodology of Signal Processing Algorithms

    Thank you!

    OutlineReader – Tag CommunicationAnalog Frontends for a Rapid Prototyping EnvironmentHF-Frontend: RequirementsHF-Frontend:�Carrier Suppression PrincipleHF-Frontend with �Tag-EmulatorHF-Frontend: VerificationMeasurement with Commercial TagUHF-FrontendRequirementsSeparate Rx/Tx AntennaSingle Rx/Tx Antenna Active Rx/Tx DecouplingUHF Reader FrontendMeasurement SetupScenario: Corridor 5th FloorReceived Tag AnswerSummary

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