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Microstrip-Based Segmented Coupling Reader Antenna for Near-Field UHF RFID Applications

Author: CaoLiang
Tutor: LiXiuPing
School: Beijing University of Posts and Telecommunications
Course: Electromagnetic Field and Microwave Technology
Keywords: UHF band RFID Near-field antenna Segment resonant antenna The segments coupled near- field antenna
CLC: TN820
Type: Master's thesis
Year: 2011
Downloads: 100
Quote: 0
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Abstract


With the design and signal processing technology has become more sophisticated , growing abatement of the price of the radio frequency identification (RFID) technology and the increasing distance of the read and write RFID are becoming more widely used in industrial , commercial and academia . Generally speaking, the radiation coupled to the ultra-high frequency (UHF) RFID antenna has the following disadvantages : large physical size , the liquid near the read and write performance is not good. In recent years , the use of the inductive coupling of the antenna as radiative coupling of alternative technologies or complementary technologies , are increasingly being used UHF RFID . Inductively coupled systems have outstanding performance in most applications , since most of the capabilities are stored in the magnetic field , subject only to the influence of the object having a high magnetic flux density . The mutual inductance between the two loop antenna size and the size of the antenna close. The ring may provide a strong magnetic field in a small , but decay rapidly . Macrocyclic provide a magnetic field range is large, but as the diameter of the antenna is close to the series resonance size (approximately λ / π), the phase of the surface current of the antenna will be inverted . In previous segmented resonant antenna design , the use of lumped elements matching network design to connect the balance port and SMA connector . However , the loss caused by the low-frequency lumped element will lead to the reduction of the read and write distance and frequency offset , lumped elements for RF expensive antenna will increase the cost of production . In order to solve the problems described above , a microstrip structure segment coupler (MSC) the near field UHFRFID reader antennas are designed for the identification of a single product . By using the distribution of two-sided design , this antenna can provide 13.5cm read range and read and write from the antenna above 4cm empty . Microstrip line - based structure , the antenna can be very convenient to use match adjustable side issues to achieve . The measured values ??of the antenna bandwidth in the case of the voltage standing wave ratio (VSWR) less than 2 to 55MHz (895-950MHz), completely covered by the U.S. Federal Communications Commission (FCC) standards ( 902- 928MHz ) . Good agreement in accordance with article structure made ??antenna testing values ??and simulation values ??.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > General issues
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