Polarization and Space Diversity Antenna Using Inverted-F Antennas for RFID Reader Applications

Kim, Jongsung; Shin, Kijung; Park, Seung-Mo; Choi, Wooseon; Seong, Nak-Seon

doi:10.1109/lawp.2006.875892

Cited by 34 publications

(15 citation statements)

References 6 publications

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“…The simulation results are shown in Figure 3. The coupling, S (3,2), of Ϫ10.195 dB and the isolation, S(3,1), of Ϫ27.558 dB are found at 920 MHz. Figure 4 shows the geometry of the proposed dual-stub microstrip directional coupler, which is based on the aforementioned conventional microstrip directional coupler with Ϫ10-dB coupling.…”

Section: Design Approachmentioning

confidence: 94%

“…Consequently, the performance of the RFID system is greatly degraded, including the sensitivity and the detection range. To improve the isolation between TX and RX, the conventional solution is to employ two separated antennas, but the size and cost of the reader are increased [1,2]. Another method is to apply a circulator [3].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, various shapes have been studied and proposed to build UWB antennas suitable for different purposes and applications. Simple geometries have been assumed as reference shapes to design UWB antennas (e.g., triangular [2], circular disk [3], annular ring [4], rectangular [5], diamond [6] and bow-tie [7]). However, canonical geometries are characterized by small numbers of degrees of freedom and the optimization, aimed at fitting suitable electrical parameters, is limited to few parameters.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new directional coupler for UHF RFID reader

Wei

Shi

Huang

et al. 2008

Micro & Optical Tech Letters

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Section: Design Approachmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A new directional coupler for UHF RFID reader

Wei

Shi

Huang

et al. 2008

Micro & Optical Tech Letters

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“…All of them are made up of copper material. The IFAs are mounted on the ground plane with a 908 sequential rotation between them [3]. IFA ports are fed through four coaxial cables.…”

Section: Antenna Designmentioning

confidence: 99%

Compact diversity antenna for UHF RFID readers

Ouattara¹,

Hamouda²,

Poussot³

et al. 2012

Electronics Letters

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A diversity antenna combining four inverted-F antennas (IFAs) is evaluated for UHF RF identification (RFID) readers. Polarisation and pattern diversities are obtained for a sequentially rotated configuration of the IFAs. Mutual coupling between ports is minimised by etching quarter-wavelength slots into the ground plane. The resulting envelope correlation coefficient is less than 0.003 in the working band. A switching diversity scheme is then applied to evaluate the tags readability in a lab environment. It is shown that the antenna diversity enhances the reading range compared to a circularly or a linearly polarised antenna of the same size.

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“…Thus, the channel can be hardened for high data rate connectivity. Antenna diversity is a practical approach that can be implemented in the data path, i.e., tag or receiver antenna diversity [12,13].…”

Section: Introductionmentioning

confidence: 99%

Coherent query scheme for wireless backscatter communication systems with single tag

Hasanvand

Khaleghi

Balasingham

2018

J Wireless Com Network

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An un-coded multi-transmitter query scheme is introduced for wireless backscatter communication systems in which M transmitters and N receivers are used for single-tag connectivity (M × 1 × N). The main idea is to harden the wireless communication channel with a tag device for high data rate readings. The proposed method is designed for multipath fading channels in which the backscatter channel is a multiplicative Rayleigh. A coherent transmit query scheme is used to increase the tag-reflected signals and simultaneously alter the fading statistics in the forward path by implementing a receiver feedback. Full-diversity performance and array gain is achieved using the receiver diversity without requiring any tag antenna diversity. Therefore, the tag device remains simple. Mathematical expressions for the probability density function (PDF) of the backscatter channel are presented using closed-form equations. Bit error rate (BER) simulations for the binary phase shift keying (BPSK) modulation are computed numerically. Diversity gain of 10 dB is obtained by using a 2 × 1 × 1 scheme. The results show that the transmit diversity for single-tag usage performs the same as the tag antenna diversity, at the expense of a moderate transmitter complexity. The tag device remains intact as a requirement for the simplicity and size constraints. Also, the system realization becomes more feasible due to the available space on the transmitter side to accomplish the uncorrelated forward channel conditions. The feasibility study is demonstrated using softwaredefined radio (SDR) implementations.

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Polarization and Space Diversity Antenna Using Inverted-F Antennas for RFID Reader Applications

Cited by 34 publications

References 6 publications

A new directional coupler for UHF RFID reader

A new directional coupler for UHF RFID reader

Compact diversity antenna for UHF RFID readers

Coherent query scheme for wireless backscatter communication systems with single tag

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