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Design and simulation of meander line antenna for RFID passive tag Vikram P Dr.H.V Kumaraswamy Department of Telecommunication Department of Telecommunication Engineering Engineering R.V. college of Engineering R.V. college of Engineering Bengaluru, India Bengaluru, India Email ID Email ID [email protected] [email protected] n Abstract: A micro-strip meander antenna for a passive Key words: EPC, RFID, EIRP radiofrequency identification (RFID) tag which can be operated in the ultra-high frequency (UHF) range from 1. 865 MHz to 867MHz is presented in this paper. The INTRODUCTION T-match is a frequently used for impedance matching Radio frequency identification (RFID) is a fast technique for UHF RFID tags A typical RFID system growing technology which uses RF signals for the consists of a reader and a tag where the tag is a passive identification purposes. Now-a-days RFID finds many device consisting of an antenna and a microchip which applications in various areas such as electronic toll bears EPC code. Passive UHF RFID tag consists of a collection, microchip attached directly to an antenna. Proper management, access control, animal tracking, and impedance match between the antenna and the chip is vehicle security. RFID is also used in fuelling stations. asset identification, retail item crucial in RFID tag design. It directly influences RFID system performance characteristics such as the range of a tag. The antenna is simulated using ADS and results obtained are satisfied. Attractive for various applications including logistics and inventory tracking. RFID devices can make a significant contribution in the health care sector. An RFID system can provide an efficient approach for patient management in hospitals including conventional linear monopole antenna to decrease the identification, patient monitoring, monitoring blood size of the antenna. The transmission lines of a pressure, and sugar levels delivery units tracking. One meander line antenna do not radiate fields. The of the most popular ways for patient identification in radiation fields will be radiated from the vertical parts hospitals is the use of a bar code printed wrist band. of meander line antenna. The mender antenna bandwidth is higher than the patch antenna. The horizontal 2. Theory A passive back-scattered RFID system operates in the UHF band. A base station (reader) transmits a modulated signal with periods of unmodulated carrier, which is received by the tag antenna. The RF voltage developed on antenna terminals during unmodulated lines mainly control the radiation resistance. The adjacent vertical lines mainly give storage of electrical energy and loss. The overall conductor length affects the inductance. Higher the number of turns the smaller the bandwidth. The number of turns will affect the return loss performance. More turns better performance. period is converted to dc. This voltage powers up the chip, which sends back the information by varying its 4. front end complex RF input impedance. The Results impedance typically toggles between two different states, between conjugate match and some other The return loss of the antenna is impedance, effectively modulating the back-scattered -39.13db.The antenna is resonating at 862 signal. The block diagram of RFID transmission is as MHz shown in fig1. Fig1: Block diagram of RFID transmission 3. Meander line antenna Fig2: Return loss The frequency range of meander line antenna is 860960 MHz The resonance frequency of the antenna is 866 MHz and EIRP is 0.825W.The Substrate used is thin flexible polyester substrate with a dielectric permittivity of 3.5, thickness of 0.051mm, dielectric loss tangent of 0.002, height of the substrate is 0.051mm and width of the line is 0.4mm.The meander line antenna can be realized by bending the - -39.133 db. The radiation pattern of the meander line antenna is similar to the dipole antenna. Meander line antenna radiates at discontinuities. The radiation pattern of the designed antenna is omnidirectional. 6. REFERENCES  Harish Rajagopalan and Yahya RahmatFig3: Smith chart The above smith chart shows that the antenna is Samii, "On body RFID Tag design for human monitoring applications," IEEE Aug. 2010. inductive. As the frequency increases the inductive effect of the antenna also increases. Based on this smith chart impedance matching can be done.  K. V. Seshagiri Rao, , Pavel V. Nikitin, and Sander F. Lam”Antenna Design for UHF RFID Tags: Review and a Practical Application,” Radiation pattern of the meander line antenna is IEEE TRANSACTIONS ON ANTENNAS AND omnidirectional. PROPAGATION, VOL. 53, NO. 12, DECEMBER 2005.  Yeonho Kim, Kyounghwan Lee, Yongju Kim, You Chung Chung “Wearable UHF RFID Tag Antenna Design Using Flexible Electro-Thread and Textile,” IEEE 2007.  M. Virili, H. Rogier, F. Alimenti, P. Mezzanotte, and L. Roselli “Wearable Textile Antenna Magnetically Coupled to Flexible Active Fig4: Radiation pattern Electronic Circuits,” IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 13, 2014 5. CONCLUSION . The results obtained are satisfied with the requirements needed for the RFID tag applications. The antenna is resonating in UHF band 860MHz-960MHz and has achieved considerable good return loss of  Manos M.Tentzeris, Sangkil Kim, Kawahara Y oshihiro, Anya Traille, Herve Aubert, Apostolos Georgiadis, Ana Collado “Inkjetprinted RFID-enabled Sensors on Paper for loT and "Smart Skin" Applications,” IEEE 2012 .  M.A. Ziai1, J.C. Batchelor2”UHF RFID tag antenna design Loughborough for On-BodyApplications,” Antennas & Propagation Conference, 8-9 November 2010  O P N Calla, Alok Singh, Amit Kumar Singh, Sandeep Kumar, Triloki Kumar” Empirical Relation for Designing the Meander Line Antenna,”Proceedings of International Conference on Microwave, IEEE 2008.  J. Choo and J. Ryoo,“UHF RFID tag applicable to various objects,” Antennas and Propagation, IEEE Transactions on, vol. 62, no. 2, pp. 922–925, Feb. 2014.  K. R. Demarest and D. D. Deavours, “Limitations of the Uda model for t-match antennas,” Progress In Electromagnetics Research, vol. 113, pp. 1–15, 2011.