Paper Info
Title
RF-Mirror: Mitigating Mutual Coupling Interference in Two-Tag Array Labeled RFID Systems
Abstract
Recent RFID systems start attaching a tag array consisting of two or more tags on an object to deal with polarization mismatch and RF phase periodicity for battery-free sensing and localization. The multi-tag solution can also provide target orientation estimation. However, when these tags are closely spaced apart, mutual coupling will be induced, producing the unexpected changes in reported RSSI and RF phase. In this paper, we present RF-Mirror that enables compensating the distortion in a two-tag array labeled RFID system. The system would output the accurate difference in tag-to-antenna distances between two tags, which is a fundamental parameter in previous works for use. Firstly, we model the backscatter signal of a responding tag in a two-tag scenario, and then formulate novel RSSI- and RF phase-distance models with coupling terms. Secondly, we design an algorithm to characterize the coupling effect on tag gain by fusing RSSI and RF phase. Thirdly, we design a decoupling algorithm based on an observation that tag mutual coupling is independent of the position of a tag array relative to a reader antenna. Our experiments show the effectiveness of our models and RF-Mirror achieves the decoupling error of 0.197 cm in calculating the tag-to-antenna distance difference.
Year
DOI
Venue
2020
10.1109/SECON48991.2020.9158443
2020 17th Annual IEEE International Conference on Sensing, Communication, and Networking (SECON)
Keywords
DocType
ISSN
RFID,Mutual Coupling,Tag Array,Radiation Pattern
Conference
2155-5486
ISBN
Citations 
PageRank 
978-1-7281-6631-5
0
0.34
References 
Authors
14
6
Name
Order
Citations
PageRank
Zhong-qin Wang1555.78
Min Xu226828.42
Ning Ye3647.52
Haiping Huang414330.90
Ruchuan Wang541464.49
Fu Xiao611535.24