Chapter 5 – Design of Passive Tag RFID Readers

Figure 5.1 A RFID reader interacting with a tag

Figure 5.2 Transmit spectrum mask example PR-ASK modulated reader with an ETSI 302-208 mask (Tari = 12.5μs, with data ‘1’ 0.5 Tari longer than data ‘0’)

Figure 5.3 An example of a RFID reader to tag communication packet

Figure 5.4 (a) ISO 18000-6C tag modulation spectrum plot in reference to the carrier frequency: FM0 modulated

Figure 5.4 (b) ISO 18000-6C tag modulation spectrum plot in reference to the carrier frequency: Miller subcarrier modulated

Figure 5.5 Protocol followed between a reader and a tag

Figure 5.6 A few example implementations of UHF ISO 18000-6C compliant RFID readers Reproduced by permission of Impinj®, Inc.

Figure 5.7 Sensitivity and available tag power versus reader range

Figure 5.8 Block diagram of a generic RFID reader implementation

Figure 5.9 Illustration of antenna radiation pattern (Reproduced from PolarPlot by permission of Bob Freeth)

Figure 5.10 Mono-static and bi-static configuration

Figure 5.11 A RFID transceiver implementation

Figure 5.12 DC offset correction

Figure 5.13 Self-jammer cancellation problem fomulation

Figure 5.14 Transmitter carrier leakage cancellation implementation

Figure 5.15 Tag reply collisions