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Transcript
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
[1] 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.
[2] 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.
[3] Yeonho Kim, Kyounghwan Lee, Yongju Kim,
You Chung Chung “Wearable UHF RFID Tag
Antenna Design Using Flexible Electro-Thread
and Textile,” IEEE 2007.
[4] 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
[5] 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 .
[6] M.A. Ziai1, J.C. Batchelor2”UHF RFID tag
antenna
design
Loughborough
for
On-BodyApplications,”
Antennas
&
Propagation
Conference, 8-9 November 2010
[7] 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.
[8] 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.
[9] 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.