Extending the Interrogation Range of a Passive UHF RFID System With an External Continuous Wave Transmitter

Park, Jun‐Seok; Jung, Jin‐Woo; Ahn, Si-Young; Roh, Hyoung-Hwan; Oh, Ha-Ryoung; Seong, Yeung-Rak; Lee, Yoon-Deock; Choi, Kyoung Hwa

doi:10.1109/tim.2009.2032868

Cited by 24 publications

(1 citation statement)

References 13 publications

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“…The read range can be extended by adding the external exciters that provide CW signal [12] or by amplifying the signal from the reader [13]. Having external exciters will allow not only for providing additional energy, but also for using that signal as an external oscillator and having all elements in the system synchronized to the same clock.…”

Section: Synchronous Detection -The Solutionmentioning

confidence: 99%

Intercepting UHF RFID signals through synchronous detection

Borisenko

Bolić

Rostamian

2013

J Wireless Com Network

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Recently, augmented ultrahigh frequency radio-frequency identification (UHF RFID) systems have been developed, and they contain additional components that can detect a tag's backscattered response and use this information for the localization of the tag and other applications. The methods currently employed either have poor performance because the detection of the tag's response is based on envelope detection or are costly because they are based on software-defined radio. The solution proposed in the paper is to use a method called synchronous detection to intercept tag signals. Using synchronous detection, we were able to use a conventional UHF RFID reader integrated circuit for the method, leading to a cost-effective, high-performance solution. We performed an analysis of its read rate and read range performance. The analysis showed that our receiver is capable of receiving tag signals with a read rate of 50% for passive and 66% for semi-passive tags at a 1-m distance between the tag and the receiver and is capable of receiving tag signals at a maximum distance between the tag and the receiver of 3.25 m for passive and 5.5 m for semi-passive tags, with the reader being within 8 m of the receiver. This augmented RFID system has a potential to facilitate localization and prevent the cross-read problem in RFID-based portals. In addition, it can be used as a protocol analyzer as well as a component of future Internet of Things.

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Section: Synchronous Detection -The Solutionmentioning

confidence: 99%

Intercepting UHF RFID signals through synchronous detection

Borisenko

Bolić

Rostamian

2013

J Wireless Com Network

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An Experimental Study on the Feasibility of a Frequency Diverse UHF RFID System

et al. 2019

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Ultra high frequency radio frequency identification (UHF RFID) is seen as a key technology for future sensor and actuator devices in the Internet of Things. Therefore, improvements of read range and reliability of this technology is highly demanded. In this paper a novel reader is proposed to work on two frequencies simultaneously, intended to improve multipath fading behavior and gain immunity to narrowband disturbance. The current legal situation is reviewed for the proposed device in the European Union and it is compared to existing multifrequency systems. The developed system is based on a software defined radio platform from National Instruments. In the measurement setup a commercially available transponder chip has been connected to the custom built reader which transmits a ''Query'' command on two frequencies −868 MHz and 915 MHz. The results show, that the transponder replies on both channels. Further measurements in a real world multipath environment show the different fading behaviour of the chosen frequencies. Furthermore, it is demonstrated how dead zones can be avoided by using two different frequencies. Additionally, within the reader software a bitwise error correction for FM0 encoded data is implemented, which employs the redundant information on the two carriers. We are able show that a multicarrier system can be implemented with commercially available tags without restrictions in the European Union. Such a system could be used to improve successful read rates in harsh environments or increase reliability in critical applications. When upgrading from an existing UHF RFID system, only the interrogator needs to be exchanged by a new device working on multiple frequencies.

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The phase difference method for transmit diversity in monostatic RFID systems

Hasan

Zhou

Griffin

2012

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation

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For passive backscatter radio frequency identification (RFID) systems, the power incident on the radio frequency (RF) tag can be improved by applying transmit diversity. In this paper, we have demonstrated a new scheme, the phase difference method, in which the phase of the forward links of a multi-antenna monostatic backscatter system are aligned at the RF tag by compensating for the phase difference between different channels. It is shown that dynamic application of transmit diversity can increase the power delivered to the RF tag at multiple points, sequentially.

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Extending the Interrogation Range of a Passive UHF RFID System With an External Continuous Wave Transmitter

Cited by 24 publications

References 13 publications

Intercepting UHF RFID signals through synchronous detection

Intercepting UHF RFID signals through synchronous detection

An Experimental Study on the Feasibility of a Frequency Diverse UHF RFID System

The phase difference method for transmit diversity in monostatic RFID systems

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