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Tags Reader Network Application Server DS NS CMD & Memory Access ID & User Mem.Data Middleware ID & Inform Access Pointed Inform & Status.

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Presentation on theme: "Tags Reader Network Application Server DS NS CMD & Memory Access ID & User Mem.Data Middleware ID & Inform Access Pointed Inform & Status."— Presentation transcript:

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4 Tags Reader Network Application Server DS NS CMD & Memory Access ID & User Mem.Data Middleware ID & Inform Access Pointed Inform & Status

5 Transponder Chip (F) Transceiver Chip (R) ReaderTransponder Reader Manager Auto Calibrator Antenna Uplink Downlink Tag / Transponder HF, LF

6 RFID Physical Processing Hybrid Circuit S/W Module Transmitter Receiver LO RX Analog TX Analog Modem RX_GAIN RX_DATA_I RX_DATA_Q RX_CTRL PLL_CLK(IIC) PLL_DATA PLL_EN SX_EN PLL_LOCK TX_DATA TX_GAIN RF_ON/OFF for OOK ASK_MOD_CTRL RX_DATA_I RX_DATA_Q PA_ON/OFF LNA Control Processor Interface DAC PLL LPF DC Canceller ADC Strong CW with weak data into reader RX front-end Chip CouplersCirculator

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8 1-bit transponder 1 or 0 Transponder in interrogation zone or No transponder in interrogation zone Application : anti-theft devices in shops EAS, electronic article surveillance Transponder : ( ) Interrogator :

9 Magnetic alternating field Receiver (Optional) LC resonant CKT, f R Sympathetic oscillation to reader ~2m ~5cm EAS

10 Microwave Tag in interrogation zone of a detector or FSK ~6cm

11 ASK or FSK modulation ~ kHz

12 f 1 = 3.5kHz f 2 = 5.3kHz f S = 20Hz Nonlinear curve Mixing Phenomenon Amorphous metal strip with a steep flanked hysteresis curve ~1.5 m min. 32mm Typical System Parameters

13 Operate using strong magnetic fields in the NF range from 10Hz to around 20kHz The function of Tag is dependent upon position Tags are small and cheap Detection rates of 70% Applications : Lending libraries, grocery industry The security device must run vertically through the amorphous metal strip Theft Prevention

14 If a security element is within the field of the generator coil, this oscillates like a tuning fork in time with the pulses of the generator coil. Transient response Tag size : 40mm x (8to14mm) x 1mm Ferromagnetic metals (nickel, iron etc.) change slightly in length in a magnetic field under the influence of the field strength H Magnetostriction Effect


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