Radio frequency identi cation (RFID) is a rapidly emerging technology that enables au-
tomatic remote identi cation of objects. Passive and semi-passive RFID systems can be
distinguished from other forms of wireless systems, because the RFID tags (transponders)
communicate by way of backscatter. In addition, passive tags derive their energy from
the RF energy emitted by the reader. RFID technology can provide a fully automated
data capture and analysis system.
Compared to a passive RFID system, an open platform semi-passive UHF RFID
tag can provide identi cation, security, low-power (compared to a wireless sensor net-
work(WSN)), medium range and medium processing speed. However, the eld of semi-
passive RFID is still under development, and has yet there are no open development
platforms available.
This thesis develops a prototype of a semi-passive UHF RFID tag that is compatible
with the leading UHF RFID standard EPCglobal Gen 2 Class 1. I alsot has the
exible
I2C and analog digital converter(ADC) interface, which allows the additional of external
analog and digital sensors. The sensor data can be read by microcontroller and stored at
memory. Standard reader can get sensor data by sending QUERY and READ command
to tag.
Test results of our open platform semi-passive UHF RFID tag demonstrated that it
can achieve a read rate above 50% when an open platform semi-passive UHF RFID tag
is placed four meters from the reader antenna and the reader output power is set to 21
dBm. In addition, the proposed semi-passive open platform RFID tag consumes very
little power (4.9 mA in 2V with system frequency set to 8MHz).
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OOU-OLD./20060 |
| Date | 20 June 2011 |
| Creators | Li, Tzu Hao |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Thèse / Thesis |
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