Analysis and measurement for passive tag modulationperformance of backscatter link

Li, Bing; He, Yigang; Zhou-guo, Hou; She, Kai; Zuo, Lei

doi:10.7498/aps.60.084202

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…Radio frequency identification (RFID), as a wireless automatic identification technology, is widely applied in traffic management, logistics transportation, medicine management, food production, etc [4]. Passive RFID tags offer several advantages such as batteryless operation, wireless communication, high flexibility, low cost and fast deployment, which all result in their extensive application in commercial use [5].…”

Section: Introductionmentioning

confidence: 99%

A CMOS pressure sensor with integrated interface for passive RFID applications

Deng

et al. 2014

Meas. Sci. Technol.

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This paper presents a CMOS pressure sensor with integrated interface for passive RFID sensing applications. The pressure sensor consists of three parts: top electrode, dielectric layer and bottom electrode. The dielectric layer consists of silicon oxide and an air gap. The bottom electrode is made of polysilicon. The gap is formed by sacrificial layer release and the Al vapor process is used to seal the gap and form the top electrode. The sensor interface is based on phase-locked architecture, which allows the use of fully digital blocks. The proposed pressure sensor and interface is fabricated in a 0.18 μm CMOS process. The measurement results show the pressure sensor achieves excellent linearity with a sensitivity of 1.2 fF kPa−1. The sensor interface consumes only 1.1 µW of power at 0.5 V voltage supply, which is at least an order of magnitude better than state-of-the-art designs.

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Section: Introductionmentioning

confidence: 99%

A CMOS pressure sensor with integrated interface for passive RFID applications

Deng

et al. 2014

Meas. Sci. Technol.

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Analysis and improvement for UHF RFID reading region in real environments

Zuo¹,

He²,

Li³

et al. 2012

Acta Phys. Sin.

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The reading region of ultra high frequency radio-frequency identification (UHF RFID) system is affected by polarization mismatch, reader antenna height, coherent interference and so on. Based on the principles of RFID technology and ray-tracing method, a complete propagation model in real environments is derived. Utilizing recognition rate of target region (RRTR), a method of evalualing the performances of a system is presented. In order to obtain the maximization of RRTR, two solutions including tag diversity and phase switch are proposed, which combines the theories of electromagnetic propagation and coherent interference suppression. The values of RRTR under different parameters are measured in outdoor and indoor environments with a commodity hardware. The measurement results show that the values of RRTR can be enhanced by 10% and 7.6% with the two solutions respectively.

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Theory and measurement for mutual coupling effect of ultra high frequency radio-frequency identification in dense environments

Zuo¹,

He²,

Li³

et al. 2013

Acta Phys. Sin.

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The close displacement of ultra high frequency radio-frequency identification (UHF RFID) tags can be considered as an electromagnetically interconnected system which causes the mutual coupling effect among antennas of tags, thereby resulting in change in impedance matching condition. Based on the principles of RFID technology and Friis propagation equation, a link budget model of UHF RFID is provided which consists of one reader and one tag. Expressions of mutual impedance in dense environments are derived by using a two-port network. Utilizing the parameters of power transmission coefficient and modulation factor, the variation of system performance is discussed in theory and tested by three experiments which are conducted in open indoor environment. The measurement results show that the change rate of minimum power transmitted by the reader antenna is in a range from -7% to 11.6% for two-tag scene and from -10% to 12.5% for two-plane arrangement.

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Analysis and measurement for passive tag modulationperformance of backscatter link

Cited by 4 publications

References 8 publications

A CMOS pressure sensor with integrated interface for passive RFID applications

A CMOS pressure sensor with integrated interface for passive RFID applications

Analysis and improvement for UHF RFID reading region in real environments

Theory and measurement for mutual coupling effect of ultra high frequency radio-frequency identification in dense environments

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