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|Title: ||Platform-tolerant RFID tag antenna|
|Other Titles: ||Ping tai xiang rong de she pin shi bie biao qian tian xian|
|Authors: ||Or, Yuk Chuen (柯育進)|
|Department: ||Department of Electronic Engineering|
|Degree: ||Master of Philosophy|
|Issue Date: ||2008|
|Publisher: ||City University of Hong Kong|
|Subjects: ||Radio frequency identification systems.|
|Notes: ||CityU Call Number: TK6553 .O55 2008|
81 leaves : ill. 30 cm.
Thesis (M.Phil.)--City University of Hong Kong, 2008.
Includes bibliographical references (leaves 76-79)
|Abstract: ||The radio-frequency identification (RFID) has gained much interest in recent years,
and its applications in many service industries have become widespread. This is because
contactless transfer of data between reader and tag in identifying objects is more flexible
than when a mechanical contact is used in automatic identification systems. The RFID
has many attractive advantages over the traditional barcodes technology, such as its long
read range, portable database, multiple read/write operation, and non-line-of-sight
tracking capability. In this dissertation, several slotted-copper-trace (SCT) antennas and
platform-tolerant RFID tag antennas are analyzed and presented. The work can be
divided into two parts, which include the design and analysis of the stand-alone SCT
antennas and RFID tag antennas.
In the first part, the fundamental characteristics of an O-, R-, and OR-shaped SCT
antenna are investigated. The return loss, current distribution, efficiency, and radiation
patterns of the antennas are analyzed and studied. Parameters that affect the resonance
frequency of the antenna are determined. Next, the proposed OR-shaped SCT antenna is
used to design a new RFID tag antenna. The tag antenna consists of a radiating ORshaped
SCT, a modified inductive feed, and a microchip. A ground plane is used in the
design to make the tag antenna platform-tolerant. The input impedance, current
distribution, percentage power transfer to the tag, and read range of the tag antenna are
investigated. In particular, the differential radar cross section (DRCS), which determines
the power of the modulated backscattered signal of the tag, is also studied. A parametric study of the RFID tag antenna was also carried out to show that the input resistance and
reactance can basically be tuned independently.
In the second part, a dual-function platform-tolerant RFID tag antenna using a
modified I-shaped SCT and two Y-shaped stubs is proposed. The SCT functions
simultaneously as an antenna and a radiating element of the RFID tag. The return loss,
antenna efficiency, DRCS, read range, radiation pattern, and parametric studies of the tag
antenna are investigated.
The characteristics of the proposed antennas were simulated by using Zealand IE3D
software, and the results were found to agree reasonably well with the measurements.|
|Online Catalog Link: ||http://lib.cityu.edu.hk/record=b2340549|
|Appears in Collections:||EE - Master of Philosophy |
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