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

Tags

Reader

Reader

NetworkNetwork

Application

Server

DS

NS

（（（（

（（））

））））

CMD & Memory Access

ID &User Mem.Data

（（（（

（（））

））））

Middlew

are

ID & Inform Access

Pointed Inform& Status

TransponderChip주파수 (F)Transceiver

Chip

송수신거리 (R)Reader Transponder

ReaderManager

AutoCalibrator

Antenna

Uplink

Downlink

Reader

Tag / Transponder

HF, LF 대역 동작 원리

부하변조

RFID Physical Processing

HybridCircuit

S/WModule

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

LPFDC Canceller

.

.

.

.

ADC

Strong CW with weak data into reader RX front-end

Chip Couplers Circulator

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 : 외부 신호에 자동적으로 신호를 되보내는 라디오 ( 한컴사전 )Interrogator : 심문자

Magnetic alternating field

Receiver (Optional)

LC resonant CKT, fRSympathetic oscillation

to reader

~2m

~5cm

EAS 무선주파수 처리 과정의 동작 원리

Microwave Tag in interrogation zone of a detector

or FSK

~6cm

ASK or FSK modulation

~ 10- 135.5 kHz

f1 = 3.5kHz

f2 = 5.3kHz

fS = 20Hz

Nonlinear curve

Mixing Phenomenon

Amorphous metal strip with a

steep flanked hysteresis curve

~1.5 mmin. 32mm

Typical System Parameters

• 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

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