By Jari-Pascal Curty, Michel Declercq, Catherine Dehollain, Norbert Joehl
Radio Frequency id (RFID) is an automated id process, hoping on storing and remotely retrieving info utilizing units referred to as RFID tags or transponders. An RFID tag is an item that may be connected to or included right into a product, animal, or individual for the aim of identity utilizing radio waves. Chip-based RFID tags comprise silicon chips and antennas. energetic tags require an inner energy resource, whereas passive tags don't.
Design and Optimization of UHF RFID Systems considers the research, layout and optimization of UHF passive RFID platforms for long-range purposes. there are various key features completely defined within the textual content:
- Wireless energy transmission
- Tag-to-reader backscattering communication
- Reader and tag architectures and IC design.
Wireless energy transmission is studied utilizing a rectifier (a primary tag building-block) for which there was a confirmed prediction version built. Proposed is a theoretical research of attainable backscattering modulations, in addition to an experimental technique to degree how the impedance modulation on the tag aspect, impacts the sign on the reader. eventually, an entire tag layout attaining a learn diversity of 12 m at 2.45 GHz (4 W EIRP) is equipped. on the time of writing, the result of this layout outperform the other on hand IC tag.
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RFID, complemented by means of different Auto-ID applied sciences reminiscent of Barcode, NFC and sensor know-how, can release large advantages for agencies and clients, growing profitable companies with the combo of know-how and procedures. you will need to recognize all elements and homes of the expertise, so that it will see its power.
This new source offers readers with all suitable info and complete layout technique of wideband amplifiers. This ebook particularly makes a speciality of allotted amplifiers and their major elements, and provides various RF and microwave functions together with famous old and up to date architectures, theoretical methods, circuit simulation, and useful implementation thoughts.
Extra info for Design and Optimization of Passive UHF RFID Systems
12, the power devoted to supply energy and the reflected power that enables the communication are complementary. As a result, they cannot both be maximized to PAY- If more power is necessary to power the tag, less power is backscattered and the communication quality is (intuitively) deteriorated. This issue is analyzed in the next subsection. 100 D? |CC 20 0 25 50 75 100 DC % 0 25 50 75 100 DC % 0 25 50 75 100 DC % Fig. 11. Average reflected power Pr normalized to PAY versus the modulation signal DutyCycle DC.
Bit stream and the corresponding (reflected) ASK modulated signals illustrating the duty-cycle power management approach. distribution at the remote side (the tag in the present case). To compare the modulation types, we compute the average reflected and absorbed power of bits "0" and " 1 . 10) (1 - | r | ' ) . 11) Eq. 11) are plotted in Fig. 12. As shown in Fig. 11 and Fig. 12, the power devoted to supply energy and the reflected power that enables the communication are complementary. As a result, they cannot both be maximized to PAY- If more power is necessary to power the tag, less power is backscattered and the communication quality is (intuitively) deteriorated.
6 Results and comparisons A 3-stage rectifier was designed and fabricated in the aforementioned process (Fig. 18). Diode-mounted transistors were also integrated to extract both currentvoltage and capacitance-voltage characteristics. 5 ^ m , 7,)m = 5 ^A 10 20 30 40 50 Output DC power consumption ^W Fig. 15. Conversion efficiency for a 3-stage rectifier. R, = 50 n, /oui = 1 /uA R, = 50 n, 7„u, = 3 /JA R, = 50 n. , 7oui = 1 M - fls = 300 Q, /oui = 3 ^A R, = 300 17, /„„, = 5 /iA Si o 0 100 200 300 400 500 600 700 800 900 1000 Incident RF power /iW Fig.