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>
In this paper, a dual-band antenna for reader of Radio Frequency Identification (RFID) applications is proposed, which operates at 2.45 GHz and 5.8 GHz. This antenna is excited by a 50Ω microstrip feed line, fabricated on Rogers RT/duroid 5880 substrate with dimensions 33x25 mm 2 , dielectric constant of 0.0009 and thickness of 1.6 mm. The main objective of the slots U-shape inverse included on the front side of antenna is to get a dual-band frequency (2.45-5.8 GHz) and improve radiation characteristics in term of gain, reflection coefficient.The structure design, optimization and simulation results analysis were performed under simulator electromagnetic HFSS (high-frequency structure simulator), and focused on the return loss, bandwidth, gain and directivity.The proposed antenna has a simple design and a miniaturized size compared to the patch antenna. It exhibits broadband impedance matching, consistent omnidirectional radiation patterns and appropriate gain characteristics in the applications of RFID.
In this work, a novel passive tag antenna has been designed, investigated and proposed for UHF RFID applications. It has a small size and can operate in the North and South American band (902-928 MHz). The proposed antenna was etched on a low-cost FR4 substrate with an overall size of 54 × 24 × 0.8 mm 3 in order to be applied as UHF RFID tag antenna at the center frequency of 915 MHz. It consists of embedded Π-match, meandered arms, and an RFID chip placed at the center. The meander line technique is used to assure the miniaturization and the Π-match technique to have a good impedance matching. This antenna has a good reflection coefficient and good read range.
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