A 3.4Mbps NFC card emulator supporting 40mm<sup>2</sup> loop antenna

Choke, Tieng Ying; Tan, Ying Chow; Leow, Chin Heng; Cao, Junmin; Jin, Liming; Zhang, Huajiang; Hor, Hon Cheong; Low, Eng Chuan; Shu, Weimin; Shanaa, Osama

doi:10.1109/rfic.2017.7969063

Cited by 1 publication

(2 citation statements)

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“…This transmission mode was called AND mode and is shown in Figure 8 in red. This technique is closest to passive tag transmission and is used in systems presented in [ 7 , 14 , 15 , 18 ]. The second analysis was performed with the continuous carrier transmission, where the carrier phase was shifted for 180° according to the standard modulation scheme.…”

Section: Simulation and Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Phase Detection and Modulation Improvement for Active Load Modulation during Continuous Transmission

Suhadolnik¹,

Rozman²,

Svete³

et al. 2021

Sensors

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The paper covers one of the communication technologies used in wireless sensor networks. We have presented improvements in existing radio frequency identification (RFID) systems to address the problem of the phase selection in active load modulation (ALM). The phase selection affects the interoperability of communication devices and has to be addressed in the design phase of a new tag. A novel transmission method is presented to make the phase selection irrelevant for device interoperability. A second solution is shown to improve the existing system synchronization, which allows operation with arbitrary selected phase. A mathematical analysis of signals present on the antenna was used together with the reference reader model to perform an analysis of proposed improvements. We proved that the proposed transmission method is less affected by phase selection. Furthermore, we demonstrated that existing system improvement allows synchronization and operation at an arbitrarily selected phase despite the continuous transmission and large signal-to-interference ratio.

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Section: Simulation and Resultsmentioning

confidence: 99%

“…A circuit presented in [ 18 ] uses an external clock for the reference and needs transmission gaps within the data frame for synchronization. This is a combination of two earlier presented systems and combines their drawbacks with no advantages.…”

Section: Introductionmentioning

confidence: 99%