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In this paper, a meander line dipole antenna for Ultra High Frequency Radio Frequency Identification (UHF RFID) tag applications is presented. The proposed antenna consists meandered dipole with end spiral conductor, an inductively coupled parasitic element for size miniaturization and T-loop for feed structure. The antenna is designed for North America UHF RFID frequency band (902–928 MHz) with Alien...
This work presents the design of a broadband modulated scattering technique (MST) probe. The MST probe works in the whole X band 8–12 GHz and achieves an operative range of about 15 meters with a limited amount of power. The communication between the reader and the tag is obtained using the standard EM4102 RFID protocol to keep the compatibility with existing RFID systems. The information is carried...
This paper proposes a reader antenna, improving the inductive coupling with a small coil whatever its position or orientation against the reader antenna. Sub-coils are inserted and the turn number is optimized in order to improve efficiency of the inductive coupling in the case of HF RFID volume detection in keeping constant the magnetic energy generated by the reader.
We present the design of a UHF RFID tag-sensor to automate the process of counting sharps used in the operating theater with the end goal of minimizing the chance of accidentally leaving a sharp inside the patient post surgery. We demonstrate how our sensor is capable of differentiating between three popular sharp sizes by correlating sharp size to a change in the signal response of the RFID tag....
This paper proposes a reader antenna, improving the inductive coupling with a small coil whatever its position or orientation against the reader antenna. Sub-coils are inserted and the turn number is optimized in order to improve efficiency of the inductive coupling in the case of HF RFID volume detection in keeping constant the magnetic energy generated by the reader.
Analysis and practical implementations of small all-platform UHF RFID transponders are presented. Four prototypes that are combinations of two topologies of integrated impedance matching circuits and two fabrication methods are introduced. With printed circuit board (PCB) technology that is the first of the fabrication methods, prototypes with two and three metal layers are presented. Measurements...
Determining an accurate circuit model for the chip of an RFID card is a complex task. We identify the prior work carried out to characterize such a chip and introduce a novel de-embedding method that provides higher accuracy through using a simple two port network. Additionally, a practical implementation of such a method is investigated and verified through measurements. Finally, the equivalent RC...
In this paper, a novel adaptive leakage suppression method (LSM) for ultra-high frequency radio frequency identification reader is proposed. The leaking power is reflected instead of absorbed to avoid saturating baseband circuits. The principle and application of this LSM based on selected power reflection actively controlled by digital baseband are discussed. The RF front-end is fabricated in a 0...
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...
This paper present a design and miniaturization of rectangular patch antenna with balanced feed. The miniaturized patch antenna for a passive radio frequency identification (RFID) tag witch can operate in the ultra-high frequency (UHF), the resonant frequency is 915MHz. The simulation was performed in High Frequency Structure Simulator Software (HFSS). The miniaturized antenna has an acceptable results...
The impedance matching between an RFID IC (Radio Frequency IDentification-Integrated Circuit) and an RFID tag antenna is of a critical importance in RFID tag design. A poor match impedance results in less power delivered to the RFID IC and poor antenna performance that lead to poor communication between the reader and the tag. In this work, we search to match the input impedance of the planar dipole...
In this paper, a novel design of metamaterial passive tag antenna for radio frequency identification operating in the UHF band is proposed. The design of the proposed tag antenna included a meandering technique to match the antenna with the tag chip and a complementary split ring resonator to reduce the antenna size. An advanced Photopaper substrate having a permittivity of 3.3, loss tangent of 0...
High Frequency Radio Frequency Identification (HF RFID) system based on Magnetically Coupled Reader Resonator Coils (MCRRC) is reported. The proposed system consists of reader antenna including small resonant coil operating by magnetic coupling with the tag coil. In the proposed system, the reader and tag impedances are modified. The equivalent electrical model is used to express the equivalent impedance...
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...
A proximity sensor is designed as an antenna-based sensor, operating at 2.4 GHz. The operating principle relies on the fact that when an object approaches an antenna, it affects its radiation properties and its input impedance. A diode power detector is used to sense the antenna input impedance variation as a reflected wave at the input terminals of the antenna. The detector output analog dc voltage...
The design of folded dipole similar to quarter-wavelength rectangular microstrip patch antenna is shown. A coplanar feeding structure is integrated in the flat radiator and accommodated to accept an RFID microchip to yield efficient operation in body-centric and highly conductive environments. Based on such antenna, an efficient transponder is designed, manufactured and experimentally verified. The...
Miniaturization of radio frequency identification (RFID) reader front-end circuit based on low temperature co-fired ceramic (LTCC) is studied in this paper. LTCC makes the dimension of the circuit a reduction of about 30% which is compared with the traditional circuit substrate in ultra high frequency (UHF) band. It makes the size of RFID front-end circuit more compact than the traditional one.
We present the development and performance evaluation of a wearable passive UHF RFID tag based on a split ring antenna that is electromagnetically optimized for operation in the close proximity of the human body. The antenna is composed of a single conductor layer and created on a light-weight textile substrate. Our results show that the split ring antenna provides stable performance for the tag placed...
To obtain the antenna impedance of antennas designed for UHF RFID applications by means of measurements, vector network analyzers are commonly applied. Such measurement devices are unbalanced by nature. In the present paper the influence of the needed test fixture and interconnection structures on the antenna impedance is investigated in terms of numerical field simulations.
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)...
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