Tài liệu Sổ tay RFID (P6) doc

... 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

... 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 mass produced product, are correspondingly cheap. RFID systems generally use 50  components. The block diagram of an inductively coupled RFID system using 50  technology shows the most important ... chapter. 11.4 Connection of Antennas for Inductive Systems Reader antennas in inductively coupled RFID systems generate magnetic flux ,which is used for the power supply of the transpond...

Ngày tải lên: 26/01/2014, 18:20

... (g) Đạm (g) 1 - 3 năm 30 250 120 200 4 - 6 năm 50 500 200 400 Trên 7 năm 80 1.500 500 500 2 Cuốn sổ tay này đợc xuất bản với sự hỗ trợ của Viện Kinh tế Sinh Thái - Hà Nội - Việt nam **************** Tham ... Gieo tha để mạ có ngạnh trê. Trung bình 1 kg giống gieo trên 20 - 25 m 2 mặt luống mạ. Gieo mạ úp tay để mộng chìm dới bùn giúp mạ chống rét, chống nóng. Giai đoạn lúa cấy: + Bón p...

Ngày tải lên: 24/12/2013, 06:15

... 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

... 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

... 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

... 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