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This paper presents a self-reconfigurable switched beam RFID reader antenna concept and its experimental implementation. The specific antenna presented in this paper is a planar 2-element Yagi array with a parasitic element loaded with a self-oscillating switching circuit powered wirelessly, by the antenna signal itself. Once this reader antenna is fed with RF signal of sufficient power, the circuit...
The concept of passive RFID tag-to-tag communications has been recently introduced and opens new promising perspectives, especially in the field of Internet-of-Things. In this paper, a simulation framework is proposed as a new tool allowing the performance evaluation of tag-to-tag radio links. The modeling takes into consideration the external source supplying the communication between tags, radiating...
In this paper, a dual band electrically small passive Ultra High Frequency (UHF) Radio Frequency Identification (RFID) tag antenna is designed. This antenna covers 865–868 MHz and 920–926 MHz UHF bands. The proposed antenna has a dimension of 55 mm (0.152λ) and 35 mm (0.072λ), this makes antenna electrically small (ka<0.47). Elliptical loop on one side (left) and T-shaped loop on other side (right)...
Wireless networks are widely used in urban or office environments and are increasingly considered as an attractive solution for various aeronautic applications. Current investigations focus in particular on RFID technologies because of their widespread use, low cost and ease of installation. The objective of this publication is to propose a concept of RFID equivalent model to predict functional and...
The development of antennas for RFID tags requires measurement of the parameters; as well as, the response of these to be questioned by a reader, the variation of the parameters with simulation tools and building prototypes of antennas can be evaluated, compared, and verified to determine whether the label complies with the basic requirements. To do this, it requires a methodology to help determine...
To address the problem of metallic interferences in vehicular RFID (Radio-frequency identification) applications, this paper proposes a novel alumina ceramic slot tag antenna (ACSTA). The proposed antenna consists of a grounded thin alumina ceramic substrate and a slotted top layer rectangular patch with all four shorting edges. This structure can be equivalent to a horizontal magnetic current flow...
RFIDs in the UHF band are getting popular gradually in a lot of situations. Many kinds of small antennas have been contrived for UHF RFIDs. However, the antenna characteristics deteriorates in the case of using the antenna around water. In this report, a small cylindrical antenna was designed, which has little effect of water. The antenna is fed from an excitation loop outside of the radiation loop...
Wireless networks are widely used in urban or office environments and are increasingly considered as an attractive solution for various aeronautic applications. Current investigations focus in particular on RFID technologies because of their widespread use, low cost and ease of installation. The question of the optimal positioning of transmitters and receivers checking all industrial constraints arises...
A novel three-dimensional (3-D) folded slot antenna is presented in this paper. By bending the planar slot antenna into a U-shaped slot antenna, quasi-isotropic radiation pattern is achieved in the full space. The volume of the proposed antenna is 11×22×22 mm3. Comparison between the planar and the folded antennas is discussed in detail. Simulated results show that the −10 dB impedance bandwidth of...
In this paper, an improved metal-backed RFID tag antenna is presented. The proposed antenna is designed to operate at 915 MHz with MONZA3 RFID chip. Ground material effect is studied for different material cases. The designed antenna achieves very good radiation characteristics with directive main lobe, and good impedance matching, which makes it suitable for metal-objects RFID applications.
This paper introduces a novel impedance matching technique for extremely low-profile on-body UHF RFID tag antennas based on coupled shorted-patch antennas. The approach employs a novel arrangement of comb-notches perpendicular to the central radiation slot that excites the close higher order mode that affects the field distribution of the fundamental mode and sets the input impedance to the required...
Wearable electronics integrate smart sensors and compact computing systems into garments. In this paper, we discuss the design and simulation of a knitted textile RFID sensor for wearable applications. The sensor comprises a textile folded dipole antenna, specifically designed for use with an inductively-coupled RFID microchip at 870 MHz. As opposed to conventional microchips, in this case the device...
In this paper, a miniaturized tag antenna with BAP (Battery-Assisted Passive Tag) technique is proposed for RFID (Radio Frequency Identification) applications. Compared with conventional passive tag antennas used for RFID, the BAP technique can help increase read rang significantly. Moreover, a modified dipole with tip-loading and a loop is utilized to make the input impedance of the designed tag...
In this paper, a low-profile dipole RFID tag antenna with a lateral omni-directional pattern is presented. The proposed low-profile antenna can be easily integrated into a size-limited RFID module. To achieve the lateral omni-directional pattern, two shorting pins are added in this antenna structure, which performs better in stacking environments. Therefore, the proposed antenna is suitable for cold-chain...
This paper represents design, analysis & investigation of an radiator for UHF RFID applications. This antenna covered the frequency spectrum 2392.86-2457.14MHz with bandwidth 14.28MHz which is sufficient for RFID tag applications. We have designed as well as simulated this antenna using Numerical Electromagnetic Code (NEC) antenna modeling software package which is based on the method of moments...
In this paper, a novel miniaturized UHF Radio-Frequency Identification (RFID) tag dipole antenna is proposed. Its original structure consists on a series of parallel arms connected to a perpendicular line at their ends. This configuration allows decreasing the physical length of the dipole antenna. A short stub is used at the input to provide a flexible impedance tuning. Two antennas were designed...
A novel planar and electrically small (0.1×0.1×0.002λ3) RFID tag antenna is proposed whose radiation pattern is near-3D omnidirectional. The proposed antenna is comprised of a small loop and an open-loop element with an inverted Z-shaped slot on it. The inverted Z-shaped slot is used to make the antenna smaller and improve the radiation performance. The proposed antenna is easy to change its shape...
The electromagnetic (EM) wave radiation of the C-slot radio frequency identification (RFID) tag located on the impedance surface in this paper is analyzed using the uniform geometrical theory of diffraction (UTD) solution. The UTD radiation solution for the impedance curved surface is employed to predict the EM wave radiation of the RFID tag mounted on the impedance curved product surface. The UTD...
The purpose of this paper is to propose a new high gain RF identification (RFID) tag antenna on 915 MHz band for the underground localization applications. The proprieties of the new RFID antenna are investigated in terms of implementation and performance; the study focuses on the substrate of the printed microstrip RFID antenna to increase the gain and then ensures large reading range. Several operations...
A new UHF RFID tag antenna used on the surface of a metallic object is proposed in this paper. In practical RFID applications, metals appear in many occasions. However, the UHF band is very sensitive to metal. When the tag antenna is near a metal, its impedance matching, radiation efficiency and directivity change and the reading distance is reduced so quickly that it cannot work. Therefore, it's...
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