Adaptive Programming of RFID Inlays in the Reactive Near Field
Doktorsavhandling, 2018

Radio frequency identification (RFID) offers a vast variety of options to improve the functionality and efficiency in the automated data collection (ADC) industry and Internet of Things (IoT). In the inventory process of RFID with passive data carriers, a population of battery less tags is located in the working range of an interrogator system. These tags contain transponders receiving operating energy from radio waves which can demodulate and modulate a digital signal from an RF carrier. The fundamental prerequisite in RFID is unique user identities (IDs) stored in the tag memories. Commonly, programming of these IDs occurs in the reactive near field, where the cavity of an RFID enabled bar code printer represents a typical example of such an environment. The two major challenges of user ID programming are the change of the electrical environment presented towards the transponder, as compared to the nominal far field or propagating near field conditions, and electromagnetic spatial selection, to prevent non-target tag programming. This thesis presents the results from an industrial Ph.D. project, in collaboration between industry and university. In a first part, novel measurement and characterization techniques of RFID transponders are presented, with the main goal of understanding the impact of non-linearity on communication quality under altered reactive near field conditions. The remaining part of the thesis addresses fundamental components needed in the concept of self adaptive reactive near field coupler technology, for geometry independent and spatially selective programming of RFID tags. The core of the technology is the differential transmission line loop (DTLL), exhibiting highly efficient and spatially selective coupling for varying inlay geometry; as such an array based spatial distribution of the reactive near field coupling is enabled. As exemplary simulations show, the versatility of the DTLL offers flexibility in array design, of creating a phase controlled reactive near field over the entire structure, which hence acts as a sensitive array. The elements act independently, where the amount of phase alteration in each element is a compensation for the geometrical size of the element itself. A fundamental property of the sensitive array is the independency of a software system, controlling the coupling elements. In other words, the reactive near field coupling of the array is self contained.

DTLL

RFID

UHF

RNF

Phase compensation

Phase shifting

Source Impedance Shift

Balun

FOM

Kollektorn MC2
Opponent: Alessandra Costanzo, University of Bologna, Italy

Författare

Markus Frank

Chalmers, Mikroteknologi och nanovetenskap, Elektronikmaterial

Differential Impedance Measurement Method of RFID Transponder Chips at UHF

Proceedings of the 43rd European Microwave Conference,; Vol. 2013(2013)p. 68-71

Paper i proceeding

Phase Compensated Transmission Line for Leakage Field Coupling in UHF RFID Applications

7th European Conference on Antennas and Propagation (EuCAP), 2013,; Vol. 13(2013)p. 1702-1706

Paper i proceeding

Shifted Source Impedance and Nonlinearity Impact on RFID Transponder Communication for Drive-Level Offsets

IEEE Transactions on Microwave Theory and Techniques,; Vol. 64(2016)p. 299 - 309

Artikel i vetenskaplig tidskrift

Lumped element balun with inherent complex impedance transformation

IEEE MTT-S International Microwave Symposium Digest,; (2017)p. 1285-1288

Paper i proceeding

Design Equations for Lumped Element Balun With Inherent Complex Impedance Transformation

IEEE Transactions on Microwave Theory and Techniques,; Vol. 65(2017)p. 5162-5170

Artikel i vetenskaplig tidskrift

A Simplified Model for the Electromagnetical Interaction between Two Differentially Fed Sub-Wavelength Transmission Line Loops

Differential Transmission Line Loop for RFID Reactive Near Field Coupling

Styrkeområden

Informations- och kommunikationsteknik

Ämneskategorier

Telekommunikation

Övrig annan teknik

Elektroteknik och elektronik

Annan elektroteknik och elektronik

ISBN

978-91-7597-683-9

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4364

Utgivare

Chalmers

Kollektorn MC2

Opponent: Alessandra Costanzo, University of Bologna, Italy

Mer information

Skapat

2018-01-07