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Radio Frequency Identification Engineering
- How to Engineer an RFID Reader
- Alírio Soares Boaventura, Nuno Borges Carvalho
- Coming soon
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- Expected online publication date:
- October 2024
- Print publication:
- 31 October 2024
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Radio frequency identification (RFID) is an undeniable aspect of modern living, being used from logistics, access control and banking to smart cities, smart transportation and as a key enabler of the Internet of Things. Presenting a unique coverage of RFID reader design and engineering, this is a valuable resource for engineers and researchers, aiding in their mission of fulfilling current demand in the RFID space and future development of this technology. Providing a cohesive compilation of resources and step-by-step techniques for full-stack design of RFID readers, the book includes algorithms and source code that can be incorporated in custom designs. Readers are invited to explore the design of RFID readers based on SDR for flexible, upgradeable solutions as well as low complexity techniques for designing low-cost readers. Additionally, the authors provide insight on related topics such as waveform design for improved reading range optimization and novel backscatter modulation techniques.
5 - Unconventional RFID systems
- Edited by Luca Roselli, Università degli Studi di Perugia, Italy
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- Book:
- Green RFID Systems
- Published online:
- 05 October 2014
- Print publication:
- 25 September 2014, pp 116-151
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Summary
Introduction
Non-conventional RFID systems include those that are not exclusively designed for identification purposes, but which also implement other advanced tasks such as location or sensing.
The most widespread, yet simple, RFID system is the one-bit EAS (electronic article surveillance) system whose only purpose is to detect the presence/absence of a tagged object in the vicinity of a reader. On the other hand, current state-of-the-art N-bit RFID systems serve a broader range of purposes, and the technology is experiencing tremendous advances. RFID readers are more robust, effective, and energy-efficient. Tags can now be made thinner, cheaper, often physically flexible, and more energy-efficient. Sensors, only used in wireless sensor nodes before, are currently making their way towards RFID tags. Some examples of these sensor-enabled tags can readily be found in the literature [1]. Multi-sensor tags including processing capabilities can also be found [2].
In order to be more autonomous and effective, beyond the energy harvesting subsystem, advanced tags also incorporate energy storage and power management units (Figure 5.1). Moreover, some tags integrate more than one method to harvest and store energy, as in Figure 5.1.
As the complexity of passive tags increases (due to sensor, analog-to-digital data conversion, and processing needs) the energy demand also increases, and consequently the system coverage range and the overall energy efficiency become a major concern. Some interesting approaches have been proposed, among them the use of specific signal shapes to improve the RF-DC efficiency of the harvester receivers. One of these examples unconventionally uses multi-sine signals with high PAPR (peak to average power ratio) waveforms (Figure 5.2) that benefit the rectification process on the harvester side [3]. Other kinds of power optimized waveforms, such as chaotic signals, are now being used to improve the RF-DC conversion efficiency [4].