Analysis and Measurement for RFID Detection
Date Issued
2006
Date
2006
Author(s)
Chen, Jian-Yu
DOI
en-US
Abstract
In this thesis, we propose two detection methods for RFID system: the incoherent detection and the coherent detection. In the RFID system, the amount of the backscattered field is very small compared to the field introduced by the environment and we can increase the detection capability by considering both the magnitude and the phase information of the backscattered field, which is the basic principle of the coherent detection method.
We construct a system for the measurement of the backscattered field of the RFID system. When discussing the detection capability, the effects of utilizing different types of antennas and adopting different transmitting power are investigated. We generate and measure the backscattered signal and the two detection methods proposed are used for the demodulation. The performance of the coherent detection is better than the incoherent detection. Besides, the effects on detection capability with different loading impedances are also discussed.
In addition, the matching state between the tag antenna and the IC is another important issue in the design of the tag antenna. Therefore, the relation between the matching state and the level difference of the backscattered signal is also investigated.
Subjects
射頻辨識
負載阻抗調變
雷達截面積
波型匹配濾波器
反射場
同調偵測
非同調偵測
Radio Frequency Identification
RFID
Impedance loading
Radar Cross Section
match filter
backscattered field
coherent detection
incoherent detection
Type
thesis
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