In this research work, a novel compact antenna with rectangular slots is presented for radio frequency identification (RFID) handled applications in the ultrahigh frequency (UHF) band that can be manufactured and integrated into RFID readers without difficult. A prototype demonstrating the aforementioned features was constructed and measured. The proposed antenna is fed by 50-Ω coaxial cable and printed on a 1.6mm thick FR4 substrate which has a small size and occupies a volume of 68×66 ×1.6mm3. The patch, the feed-line and ground plane are made of PEC (Perfect Electric Conductor) with a thickness of 0.035 mm. Measured results indicate that the proposed antenna has a good impedance matching characteristic ranging from 889 to 939MHz, which covers the USA RFID-band (902–928MHz), the Chinese RFID-operating-band (920–924.5MHz), and the Korea and Japan RFID-band (917–923.5MHz). These results were achieved by the insertion of slots in the compact structure of the antenna. The electromagnetic simulators HFSS (High Frequency structure simulator) and CST (Computer Simulation Technology) microwave studio were used for the design, modeling and simulation of the antenna. The focus of the study of our antenna was on the parameters of return loss, bandwidth, Voltage Standing Wave Ratio (VSWR), input impedance and gain.
<p><span>This paper displays a new design of a small antenna proposed for radio-frequency identification (RFID) applications in the UHF band (ultra-high frequency). Our antenna is constituted of two rectangular patches linked together with a meander line. Using this technique reduction in antenna size of equal to 62% with respect to the conventional antenna was achieved. The antenna has a simple structure and small antenna size of 60 x 74mm<sup>2</sup> or 0.184 <sub>λ0</sub> x 0.226 <sub>λ0</sub>. It has been fabricated on a low-cost FR4 substrate and measured to validate the simulation performances.</span><span>The measured bandwidth is around 54.4 MHz (889.3 - 943.7 MHz) with reflection coefficient less than 10 dB, which covers all of the American RFID band (902 - 928 MHz), Chinese RFID band (920.5 - 924.5 MHz), Korea Republic and Japan RFID band ( 917 - 923.5 MHz).</span><span>The design and simulations have been effected by electromagnetic simulators HFSS and CST microwave studio. A good accord is getting between the simulated and measured results. This antenna is intended for the reader of RFID applications.</span></p>
This article proposes a new and simple miniaturized tag for radio frequency identification (RFID) in the European and Moroccan UHF band (866-868 MHz). This tag can be mounted on the surfaces of the human body and may be used for identification cards. For human body modelling, we used a four-layer laminated elliptical cylinder with physical parameters for electromagnetic simulations. The radiation characteristics of the antenna placed in proximity to the human model and the effects of absorption caused by the human body were analysed and controlled. Our antenna is composed of a meander dipole and a T-shaped adaptation network structure. We used the CST-MS for the design of the antenna and the human body model and verified the results with the HFSS simulator. The designed tag was manufactured to test the reading range. The measured range is about 6 m when the tag is placed near to the chest and between hands. The new features of the proposed new tag are characterized by its simple structure, reliable stability on the surface of the human body, a long reading range and a miniaturized size of 46 x 20 mm 2. Our antenna was designed on a low-cost, single-sided FR-4 substrate with a thickness of 0.8 mm. Compared to the conventional ultra-high frequency patch; our antenna achieves a miniaturization rate of 91%.
This article suggests a simple and new miniaturized antenna for radio-frequency identification (RFID) tags in the European and Moroccan UHF band (866-869 MHz). Our structure consists of a meandering dipole, L-shaped radiators and a changed T-Match network. The meander technique was applied to decrease the antenna size; using this method, the size of our structure has been reduced to 68% compared to the classical UHF dipole. L-shaped radiators and a modified T-matching approach are also used to easily match the antenna input impedance to that of the chip to maximize power transfer. The size of our antenna is 50 x 22 mm 2 , it has been designed on a single-sided FR-4 substrate with a thickness of 0.8 mm for a relative permittivity, Ɛr of 4.4. For our design, we chose the Higgs 4 IC chip (manufactured by Alien Technology, USA) which has an impedance of 20.5-j191 Ω obtained at the centre frequency 867 MHz. The antenna performance was studied with respect to the impedance matching, realized gain, reflection coefficients and read range of the label. Therefore, the proposed design achieved a gain of 1.2 dB and a maximum reading range of 13.94 meters at 867 MHz.
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