Tài liệu Sổ tay RFID (P8) pdf

... 8 Data Security RFID systems are increasingly being used in high security applications, such as access systems and systems for making payments or issuing tickets. However, the use of RFID systems ... use of security measures to protect against attempted attacks, in which people try to trick the RFID system in order to gain unauthorised access to buildings or avail themselves of services...

Ngày tải lên: 26/01/2014, 18:20

... shown in Tables 9.7 and 9.8 exist for the physical interface between reader and smart card of an RFID system in accordance with ISO 14443-2. 9.2 CONTACTLESS SMART CARDS 245 9.2.2.3 Part 3 – Initialisation ... description of standards in this chapter merely serves to aid our technical understanding of the RFID applications dealt with in this book and no attempt has been made to describe th...

Ngày tải lên: 26/01/2014, 18:20

... every RFID system 8 1 INTRODUCTION Table 1.1 Comparison of different RFID systems showing their advantages and disadvantages System parameters Barcode OCR Voice recog. Biometry Smart card RFID systems Typical ... Whereas global sales of RFID systems were approximately 900 million $US in the year 2000 it is estimated that this figure will reach 2650 million $US in 2005 (Krebs, n.d.). Th...

Ngày tải lên: 21/01/2014, 23:20

... there are some points for consideration when selecting RFID systems. 26 2 DIFFERENTIATION FEATURES OF RFID SYSTEMS 2.5.1 Operating frequency RFID systems that use frequencies between approximately ... If we are to maintain an overview of RFID systems we must seek out features that can be used to differentiate one RFID system from another (Figure 2.1). RFID systems operate accordin...

Ngày tải lên: 21/01/2014, 23:20

... divider 3.1.3 Electromagnetic 3.1.4 RFID systems 1 bit (EAS) 3.1 Acoustomagnetic 3.1.5 Electrical coupling 3.2.4 Figure 3.1 The allocation of the different operating principles of RFID systems into the sections ... reason, in this book pulsed systems — for differentiation from other procedures, and unlike most RFID literature(!) — are termed sequential systems (SEQ). 3.2.1 Inductive cou...

Ngày tải lên: 21/01/2014, 23:20

... a resonant frequency that corresponds with the 74 4 PHYSICAL PRINCIPLES OF RFID SYSTEMS operating frequency of the RFID system in question. 1 The resonant frequency of the parallel resonant circuit ... transponder is constant (f = 13.56 MHz, R 2 = 1 ) 78 4 PHYSICAL PRINCIPLES OF RFID SYSTEMS an inductively coupled RFID system. However, we must also bear in mind that the influence of c...

Ngày tải lên: 21/01/2014, 23:20

... include RFID transponders and Electronic Article Surveillance (EAS) in shops. 5.2.1.5 Annex 11: RFID applications Annex 11 describes the frequency ranges and permitted transmission power for RFID systems. ... inductive radio systems, such as lorry barriers ( RFID) , EAS, traffic control systems, metal detectors, recognition systems for people, animals and goods (RFID) , but also data an...

Ngày tải lên: 26/01/2014, 18:20

... describes a digital communication system. Similarly, data transfer between reader and transponder in an RFID system requires three main functional blocks. From the reader to the transponder — the direction ... medium transmits the message over a predetermined distance. The only transmission media used in RFID systems are magnetic fields (inductive coupling) and electromagnetic waves (micro...

Ngày tải lên: 26/01/2014, 18:20

... various carrier frequencies are simultaneously available to the communication participants. In RFID systems, this can be achieved using transponders with a freely adjustable, anharmonic transmission ... transponder → reader (uplink): several channels in the r ange 433–435 MHz). One option for load modulated RFID systems or backscatter systems is to use various independent subcarrier frequ...

Ngày tải lên: 26/01/2014, 18:20