A UHF Mobile RFID Reader IC with Self-Leakage Canceller

Lee, Jeiyoung; Choi, Jinhee; Lee, Kang Ho; Kim, Bonkee; Jeong, Minsu; Cho, Young-Ho; Yoo, Heeyong; Yang, Kyoungon; Kim, S.; Moon, Seong-Mo; Lee, Jae-Young; Kong, W.; Kim, Jin; Lee, Tae‐Ju; Kim, Bo-Eun; Ko, Beom-Kyu

doi:10.1109/rfic.2007.380881

Cited by 35 publications

(21 citation statements)

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“…본 논문에서는 기존의 연구 [4], [5] [7] . 최근 연구에 따르면 UHF 대역 전지 지원형 RFID 태그 수신 감도는 20 m 거리에서 사용될 수 있는 -23 dBm에 이르고 있 다 [8], [9] .…”

Section: 리더는 태그가 역산란 변조를 하도록unclassified

“…Direct coupling compensation architecture [3] . [4], [5] . 그러나 누설 전력의 구성은 그림 1에 보인 바와 같이, 두 개의 누설 신호로 생각할 수 있는데, 안테 나로부터 되돌아오는 누설 신호의 경우 환경과 경로 변화에 민감하며, 이로 인한 위상의 작은 오차는 리 더 수신기의 감도를 급격히 감소시킨다 [3] .…”

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A Novel Carrier Leakage Suppression Scheme for UHF RFID Reader

Jae-Pil¹,

Park²,

Yeom³

2011

The Journal of Korean Institute of Electromagnetic Engineering

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RFID technologies, which allow collecting, storing, processing, and tracking information by wirelessly recognizing the inherent ID of object through an attached electronic tag, have a variety of application areas. This paper presents a novel carrier leakage suppression RF(CLS-RF) front-end for ultra-high-frequency RF identification reader. The proposed reader CLS-RF front-end structure generates the carrier leakage replica through the nonlinear path that contains limiter. The limiting function only preserves the frequency and phase information of the leakage signal and rejects the amplitude modulated tag signal in the envelope. The carrier leakage replica is then injected into the linear path that contains phase shifter. Therefore, the carrier leakage signal is effectively cancelled out, while not affecting the gain of the desired tag backscattering signal. We experimentally confirm that the prototype shows a significant improvement in the leakage to signal ratio by up to 36 dB in 910 MHz, which is consistent with our simulation results.

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Section: 리더는 태그가 역산란 변조를 하도록unclassified

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A Novel Carrier Leakage Suppression Scheme for UHF RFID Reader

Jae-Pil¹,

Park²,

Yeom³

2011

The Journal of Korean Institute of Electromagnetic Engineering

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“…This demands for receivers with very large dynamic ranges, which enhance costs, both on the analog front end as well as on the analog to digital converters. To reduce these demands, many authors [6,[8][9][10][11][12][13][14][15][16][17] as well as commercial monolithic RFID reader chip manufacturers [18,19] propose or use active leakage cancellation techniques. These techniques, which originate in radar [20,21], extract a part of the transmit signal, adjust it in amplitude and phase and inject it at the receiver.…”

Section: Introductionmentioning

confidence: 99%

Automatic leaking carrier canceller adjustment techniques

Lasser¹,

Langwieser

Mecklenbräuker

2013

J Embedded Systems

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In this contribution, four automatic adjustment algorithms for leakage carrier cancellation in radio frequency identification (RFID) readers are compared: full search, gradient search, fast and direct I/Q algorithms. Further, we propose two enhanced adjustment procedures. First, we analytically calculate the performance of the fast adjustment algorithm in the presence of noise and derive its theoretical bias. We compare the theoretical results with the numerical results from accompanying simulations. Further, we evaluate the performance of these algorithms based on real-world measurements acquired with our RFID testbed. Finally, we propose and discuss the merits of two enhanced adjustment procedures based on the fast adjustment algorithm. The fast adjustment procedure with bipolar probing signals achieves the isolation gain of the (much slower) gradient search algorithm at the expense of a mean penalty of 0.48 dB. We observe that the fast adjustment aided gradient algorithm requires 72% less steps than the gradient search algorithm in our measurements.

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“…The receiver sensitivity and the performance of readers would degrade, therefore, to improve the isolation and upgrade the receive circuit are necessary. According to the protocols [2] and the related materials [3], [4], when the X T launches command information, the receiver circuit is in non-working state; after the command information is sent, a continuous carrier wave is transmitted and the receiver circuit starts to work simultaneously. Because the output signal through Up-Mixer is very small in X T , there are usually a pre-amplifier and a power amplifier in order to achieve the transmission power requirements.…”

Section: Introductionmentioning

confidence: 99%

An improved RF front-end of UHF RFID

Liu

You

Wen³

2010

2010 International Conference on Microwave and Millimeter Wave Technology

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The circulator is usually used in UHF RFID front end circuit to isolate the leakage from X T to X R , however, due to the insufficient of the circulator in isolation, there is still a lot of CW signal leaking into the X R circuit inevitably. LNA is abnegated in order to prevent the demodulator from saturation, which will degrade the receive sensitivity and the dynamic range of the receive circuit. A case that can increase the isolation was proposed, which can also upgrade the architecture of the X R . A design of LNA was simulated and accomplished in the basement of UHF RFID practice.

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A UHF Mobile RFID Reader IC with Self-Leakage Canceller

Cited by 35 publications

References 0 publications

A Novel Carrier Leakage Suppression Scheme for UHF RFID Reader

A Novel Carrier Leakage Suppression Scheme for UHF RFID Reader

Automatic leaking carrier canceller adjustment techniques

An improved RF front-end of UHF RFID

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