Journal ArticleDOI
Short-range radio-telemetry for electronic identification, using modulated RF backscatter
A.R. Koelle,S.W. Depp,R.W. Freyman +2 more
- Vol. 63, Iss: 8, pp 1260-1261
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TLDR
In this article, an electronic identification system using modulated backscatter from an RF beam-powered tag is described, where a subcarrier is used in the return signal format to allow separation from the background clutter and to allow use of a novel method to avoid RF phase problems.Abstract:
An electronic identification system which uses modulated backscatter from an RF beam-powered tag is described. A subcarrier is used in the return signal format to allow separation from the background clutter and to allow use of a novel method to avoid RF phase problems.read more
Citations
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Journal ArticleDOI
The history of RFID
TL;DR: This RFID system uses the principle of modulated backscatter where it can transfer the data from the tag to the reader and changes the loading on the tag antenna in a coded manner corresponding to the stored data.
Journal ArticleDOI
The art of UHF RFID antenna design: impedance-matching and size-reduction techniques
TL;DR: In this article, a homogeneous survey of relevant methodologies for the design of UHF passive tag antennas is presented, within a common framework, the basic concepts of the most-used design layouts.
Journal ArticleDOI
Theory and measurement of backscattering from RFID tags
Pavel Nikitin,K.V.S. Rao +1 more
TL;DR: In this article, the authors presented a method for measuring signal backscattering from RFID tags, and for calculating a tag's radar cross section (RCS) by using an anechoic chamber with and without the tag.
Proceedings ArticleDOI
An Overview of Near Field UHF RFID
TL;DR: In this paper, an overview of near field UHF RFID is presented, and the basic theory of near and far field antenna coupling in application to RFID, and some experimental measurements are presented.
Journal ArticleDOI
— Invited Paper — Backscatter Communication and RFID: Coding, Energy, and MIMO Analysis
Colby Boyer,Sumit Roy +1 more
TL;DR: This work investigates RFID MIMO systems where the channel fading encountered has different statistics than the classical Rayleigh fading model, and finds the trade off between diversity order and spatial multiplexing gains are distinct from wide-area MIMo.
References
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Patent
Electronic license plate for motor vehicles
TL;DR: An electronic license tag or plate formed into a unitary structure and including a single antenna system cooperating in a system comprising a harmonic radiator which transmits a pulse coded identification signal in response to an interrogation signal, and in a signal communication path for detecting and decoding code modulations in the interrogation signal and deriving therefrom an information signal which is communicated to the operator of a vehicle to which the tag or license plate is affixed.
Journal ArticleDOI
Small Resonant Scatterers and Their Use for Field Measurements
TL;DR: In this paper, a general formulation for the backscattered field from loaded objects is given, and it is shown that small resonant objects produce a much greater back scattered field than small non-resonant ones.