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This paper presents the focusing characteristics of near fields radiated from multi-panel phased array antennas, where each panel of the antenna array is designed to focus its radiation in the antenna near-field region, for UHF-RFID applications. The cylindrical arrangement of panels creates a relatively symmetrical focusing region beneficial to the tag detection within a confined region of bio-medical...
This paper presents a design of the universal reader antenna applied for the radio frequency identification (RFID) system with the operating frequency from 840 MHz to 960 MHz. The antenna structure consists of a rectangular loop and a rectangular feeding patch which are the important elements to produce the circular polarization. The total size of the reader antenna is 120 mm ×120 mm fabricated on...
Conventional loop antennas for RFID reader usually perform worse with metallic environment. To improve reading range under this condition, a ferrite sheet is incorporated in the conventional loop antenna. The proposed antenna yields similar reading range with or without metallic environment.
This paper presents the application of metamaterial structure for improving the gain of antenna to extend the reading distance of UHF RFID reader without any modifying of the original reader. The proposed structure of metamaterial is designed on the theory of Spilt Ring Resonator (SRR), which located in front of such the RFID reader, while the back side of reader is blocked with a metallic sheet as...
This study presents the potentials of 3D printing in the utilization of passive RFID components on a cotton substrate. New types of 3D-printable conductive materials, graphene ink and stretchable silver conductor, are used in antenna fabrication. Our measurement results confirm that both types of wireless components reach high performance: the achievable read ranges of the graphene and stretchable...
This paper presents the technique to detect the impure palmyra juice using short-time matrix pencil method (STMPM). The STMPM utilizes a sliding window and a matrix pencil method for extracting complex natural resonances of an object. Since the pure and impure palmyra juice have different complex permittivity, the complex natural resonances should also be different. The variation of complex natural...
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...
Antenna miniaturization techniques using meander line and Near-field Resonant Parasitic (NFRP) are presented in this paper. Also, antenna performance including reflection loss and gain have been optimized during the scale-down process. The proposed antennas are compared with the theoretical limits of small antennas to confirm the optimized performance in a limited space. The smallest possible size...
This paper describes a design of a UHF-RFID tag built by a graphene, designing with NXP G2XL IC chip. The tag can operate covering the UHF-RFID universal standard in accordance with the EPC global Class 1 Gen. 2 standard. The presented antenna is compact, easy to read and responsive. These articles focus on a design and developing of a compact universal passive tag antenna in order to operate entire...
A planar reversed log-periodic near-field antenna is proposed for ultra-high frequency (UHF) radio frequency identification (RFID) application in this letter. The proposed antenna is composed of two planar reversed log-periodic dipole antenna (LPDA) units. The concept of two closely spaced, oppositely directed currents (ODCs) and the design guideline of LPDA are adopted to achieve strong and uniform...
This paper presents the design of an ellipsoidal reflector antenna for the RFID applications at UHF band, which can be potentially integrated with a dome-shape building structure. Due to the dual-focus radiation characteristics in the ellipsoid near-field region, the feed located at one of the two foci can create a focused field distribution around the other focus, which is located in the ground area...
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