UHF RFID Reader Antenna Research Articles

Design and Fabrication of Long-range UHF RFID Reader Antenna with Protection Cover

Design and Fabrication of Long-range UHF RFID Reader Antenna with Protection Cover

Wireless Train Detection Based on Null-Filled UHF RFID Reader Antenna for Communications-Based Train Control

Wireless Train Detection Based on Null-Filled UHF RFID Reader Antenna for Communications-Based Train Control

Low Profile UHF-RFID Reader Antenna with High Front-to-back Ratio

Low Profile UHF-RFID Reader Antenna with High Front-to-back Ratio

Retracted: Effects of the FR 4 Substrate Realized in a Circularly Polarized UHF-RFID Reader Antenna with Fractal Geometry for Enhancing Parameters

Retracted: Effects of the FR 4 Substrate Realized in a Circularly Polarized UHF-RFID Reader Antenna with Fractal Geometry for Enhancing Parameters

UHF RFID reader antenna with switchable far‐field and near‐field working state

An ultra-low profile and high-performance UHF RFID reader antenna is proposed in this letter, which can be switched between far-field (FF) and near-field (NF) operative modes. This antenna is composed of four dipoles and a reconfigurable feed network. The four dipoles form a square, and the feed network is located in the centre. The feed network is a four-way power divider, and the phase of the output signal can be controlled by switching diodes. As a balanced structure, double-sided parallel-strip lines (DSPSLs) are used to feed four dipoles. Compared to the balun structure, the application of DSPSLs can reduce the area of the feed network, thereby reducing the influence of the feed network on the central magnetic field. Experimental results show that the proposed antenna can provide a NF reading area of 180 × 180 mm2, and the identification rate can reach 100% within 30–60 mm height. The FF gain of the antenna is 4.7 dBic, and the overlapping range of 3 dB AR bandwidth and −10 dB impedance bandwidth is 800–960 MHz. The good FF and NF performance of this antenna is conducive to its application in RFID systems.

An UHF RFID Reader Antenna with Multitag Identification for Extremely Low-Temperature Medical Systems

A radio frequency identification reader antenna having multitag identification for medical systems is presented, which consists of four PIFAs, two hybrid couplers, and four power dividers. The high isolation is achieved by the symmetric design of the antenna geometry and four power dividers, which are fed by two hybrid couplers. The experimental results show an isolation of more than 40 dB in the North American (902–928 MHz), Korean (917–923.5 MHz), and Japanese (916.7–923.5 MHz) RFID frequency bands.

基于分形结构的UHF RFID阅读器天线设计

基于分形结构的UHF RFID阅读器天线设计

Long-Range Monitoring System with PDMS Material

This paper describes the development of a long range monitoring system that integrates Cottonwood: UHF Long Distance RFID reader module with Raspberry Pi 3. When a UHF RFID tag is within the UHF RFID reader antenna’s range, the unique ID of the tag will be transferred to the Raspberry Pi 3 to be processed. Then, the data will be sent over to the database wirelessly to be managed, stored, and displayed. The paper also describes the measurement done to determine the most suitable thickness of PDMS material so that it could be incorporated as a wearable transponder. After the result is calculated and tabulated, it can be concluded that the most suitable thickness of PDMS material for the transponder is 8 mm.

Flexible circuits and materials for large-area UHF RFID reader antenna systems

RF electronics commonly incorporate PCB materials with low loss tangents, which limits its use for large-area applications due to its high cost. This work verifies one alternative solution how non-conventional flexible circuit materials can be used to manufacture large functional surfaces for RF-based applications. Laminated Al foils are used for conducting layers and a flexible foam material is used for substrate. An RFID reader system has been developed to demonstrate the functionality, comprising of eight microstrip antenna elements arranged in a SP4T switching structure covering an area of 1.2 m × 0.6 m. Each antenna element is individually addressable with aid of distributed digital and analogue multiplexer circuitry and it is shown how these components can be soldered directly onto the Al conductors. The constructed system shows good RF performance, both with regards to the materials and to the interconnections with the distributed multiplexer circuitry. It can perform far-field RFID tag reading above its surface without dead zones and the system characterization implies that the concept can be further expanded to cover geometrical areas up to 1000 square meters.

A Meander Line UHF RFID Reader Antenna for Near-field Applications

A novel ultrahigh frequency radio frequency identification reader antenna based on electromagnetic coupling between two open-ended microstrip (MS) meander lines for near-field applications is investigated in this paper. The corresponding currents flowing along the two MS meander lines are reversed in phase with approximately identical amplitudes. Meander-line units are introduced to achieve a uniform distribution of strong magnetic and electric fields. The performance of an antenna prototype comprised of six pairs of meander lines is analyzed. The proposed antenna simultaneously exhibits a uniform magnetic field distribution with a reading region of 480 mm $\times200$ mm $\times20$ mm and a uniform linear electric field distribution with a reading region of 480 mm $\times420$ mm $\times300$ mm. The proposed antenna exhibits a low far-field gain, and has a bandwidth from 914 to 929 MHz. Both simulated and measured results have shown a good performance of the antenna.

Compact Multiservice UHF RFID Reader Antenna for Near-Field and Far-Field Operations

This letter presents a compact ultrahigh frequency multiservice radio frequency identification reader antenna for near-field and far-field operations. The far field is circularly polarized, and the strong near field is generated using inductive coupling. The dimension of the prototype is 83 × 83 × 1.6 mm 3. The prototype is based on a rectangular slot antenna, fed by an L-shaped feed. An integrated near-field and far-field radiator along with asymmetric slot perturbation result in circular polarization. The strong magnetic field in the near-field is generated by a configuration of stubs in the radiator, which bring oppositely directed current over the antenna plane. The antenna exhibits an impedance bandwidth of 110 MHz. The axial-ratio bandwidth (ARBW) of 37 MHz is also reported. A near-field interrogation area of 220 × 180 mm2 is reported for this antenna.

Folded ring slot antenna reader for UHF RFID applications using artificial magnetic conductor structure

ABSTRACTThis article presents a new design of an UHF RFID reader antenna with a circular polarization and radiation pattern in one hemisphere. This antenna consists of two parts which are a radiating element and an artificial magnetic conductor (AMC) structure. The radiating element is based on a slot ring antenna using a folding technique for rings and only one feeding source while keeping a circular polarization. The AMC structure is a simple patch structure using a size reduction technique. The possibility to mix with two different materials for substrates involves the realization of six antennas which are presented in this article. Their overall is 226 mm × 226 mm × 11.06 mm. The antenna with the best performances in the UHF‐RFID‐ETSI band has a gain of 6.9 dBic and an axial ratio of 3dB. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2790–2794, 2016

Metamaterial 발룬으로 급전된 Capacitively Loaded 루프 안테나

This paper presents a balun consisting of a T-junction, a Right/Left Handed Transmission line(RLH-TL), and a conventional Right Handed(RH) line. It is assumed that the RLH-TL consists of N unit-cells. We provide closed-form solutions and design a very compact wideband(80 %) balun using CPW lines based on the obtained solutions. Then, we propose a capacitively loaded loop antenna designed for a uniform current distribution. The antenna resistance of the proposed antenna at resonance is about 204 ohms. The length of the unit cell is about (total length: ). The magnetic field generated from the proposed antenna is stronger than that of the conventional one by as much as 20 dB. We used a coplanar strip line(CPS) to combine the loop antenna and balun. The proposed antenna may be used as a near field UHF RFID reader antenna.

A COMPACT FOLDED PRINTED DIPOLE ANTENNA FOR UHF RFID READER

A compact printed dipole antenna for UHF RFID reader is presented. The peak gain of the printed dipole antenna is 2.07 dBi, which is higher than traditional UHF RFID antenna. The proposed antenna occupies a volume of 65 × 30 × 2m m 3 and the radiator is composed of two rectangular patches etched with folded slit. The radiation element of the dipole antenna is fed by 50 Ω coaxial line. Measured results indicate that the proposed antenna has a good impedance matching characteristic at 905-935.5 MHz (return loss less than 10 dB). In addition,the effect of some parameters on the performance of the proposed antenna is also discussed in this article. This printed dipole antenna will be applicable for future RFID systems.

Aperture‐coupled UHF RFID reader antenna for a handheld application

AbstractThis article presents a new UHF RFID reader antenna for a handheld reader system. An aperture‐coupled structure is employed to cover the North American UHF RFID frequency band: 902–928 MHz. A thick high‐dielectric substrate with a relative permittivity of εr = 8 is used for the size reduction. The rectangular stubs on the proposed annular ring patch contribute to effective impedance matching and good axial ratio performance. The proposed antenna has a total volume of 100 mm × 100 mm × 9.6 mm and exhibits a maximum RHCP gain of 2.68 dBi and an average axial ratio of 1.1 dB for the application frequency band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1261–1263, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23349