The document describes the design of a planar inverted multiband slotted patch antenna for RFID applications. Some key points: - The antenna was designed to operate in the UWB frequency range to avoid metal-water problems and enable low-profile and high data rate operation. - Design calculations were shown for parameters like width, length, effective dielectric constant. Specifications included a reinforced fiber-glass substrate with epsilon-r of 4.6. - The prototype antenna had dimensions of 15x12x1.6 mm and experimental results showed improved data rate of 86%, size reduced by 50%, and power consumption reduced by 38% compared to existing designs.

1. PLANAR INVERTED MULTIBAND
SLOTTED PATCH ANTENNA FOR
RFID APPLICATION
Presented by
SRITHAR.A,PG Student
Dr.E.D.KANMANI RUBY, Professor
G.DEEPA, Assistant Professor
Kongu Engineering College, Perundurai, Erode

2. OBJECTIVE
• Design of an antenna for RFID Application
• Features of the new design
- Avoid metal-water problem
- Enhance the reading range with suitable
operating frequency
- Flexibility

3. PRACTICAL IMPORTANCE OF RFID
• Barcode
• Optical Character Recognition
• Biometric
• Smart Card
• RFID
Man power needed
No need of Man power

4. FEATURES OF RFID
• Non-Line-of-Sight
• Multiple RW
• Reliability in reading
• Environmental Susceptibility/Durability
• Difficult to Replicate
• Access Security
• Read Range
• Memory Size/Data Storage

5. APPLICATIONS
• Asset Tracking
• Book access in Library
• Healthcare
• Toll Road
• Boarding Baggage
• Manufacturing automation
• Logistics and distribution
• Retail shops
• Product security

6. EXISTING LIMITATIONS OF RFID
• Lack of accuracy
• The costs of developing RFID is costlier than
barcodes
• A lack of global standards and regulations

7. SPECTRUM FOR RFID
APPLICATION
• Low Frequencies (LF)—125–134 kHz
• High Frequency (HF)—13.56 MHz
• Ultra High Frequency (UHF)—860–960 MHZ
– Inductive coupling and back scattering problems occurs in
above frequency ranges
• Microwave—ISM band (range from 6.765 MHz to
246 GHz)
• 2.45 GHz free band is fully utilized for many wireless
applications

8. PROBLEMS IN LOWER
FREQUENCY RANGE

9. Designation Frequency Passive Read Distance
Low Frequency (LF) 120-140 KHz
10-20 cm
High Frequency (HF) 13.56 MHz
10-20 cm
Ultra-High Frequency
(UHF)
868-928 MHz
3 meters
Microwave 2.45 & 5.8 GHz 3 meters
Ultra-Wide Band (UWB) 3.1-15.78 GHz 10 meters

10. EXISTING SYSTEM
• Design an RFID antenna in UHF range
• Multiple tag reading is not possible
• RFID suffered from metal-water problem
• Reading rate slower
• Passive tag costlier and complex
• Size of the antenna is big

11. PROPOSED SYSTEM
• Design an RFID antenna in UWB range
– Resistance to metal-water problem
– Low-profile and high data rate
– Immune to EMI
– Prosperous suit to active tag as well
• Reduction in the antenna size

12. DESIGN PROCEDURE
• Calculation of the Width (W)
𝑊 =
𝑣 𝑜
2𝑓𝑟
2
𝜀 𝑟+1
• Calculation of Effective dielectric constant (εreff)
𝜀 𝑟𝑒𝑓𝑓 =
𝜀 𝑟 + 1
2
+
𝜀 𝑟 − 1
2
1 + 12
ℎ
𝑊
−1 2
• Calculation of the length extension (∆L)
∆𝐿
ℎ
= 0.412
𝜀 𝑟𝑒𝑓𝑓 + 0.3 (
𝑊
ℎ
+ 0.264)
(𝜀 𝑟𝑒𝑓𝑓−0.258)(
𝑊
ℎ
+ 0.8)
• Calculation of actual length of patch (L)
𝐿 =
λ
2
− 2∆𝐿 =
c
2𝑓 𝜀 𝑟𝑒𝑓𝑓
− 2∆𝐿

13. SPECIFICATION OF ANTENNA
Substrate Material used Reinforced Fiber-Glass Polymer Resin Material
With dielectric constant of 4.6
Radiation Pattern Omni-Directional
Feeding method 50-Ωmicrostrip feed line

14. ANTENNA PROTOTYPE

15. DESIGN VALUES OF ANTENNA
Parameters L L1 L2 L3 L4 L5
Value
(mm)
15 5 2 2 6.5 6.5
Parameters W W1 W2 W3 W4 W5
Value(mm) 12 4.5 4.5 3 4 4

16. RETURN LOSS
Frequency vs Return Loss (S11)

17. Cont’d…
Radiation pattern

18. Cont’d…
Frequency vs VSWR

19. CONCLUSION
• Designed UWB antenna has
– Improved data rate of 86% approximately
– Size reduced to 50% approximately
– Power consumption 38%
• Hence flexible implementation for RF application is
possible.

20. REFERENCES
1. V. D. Hunt, A. Puglia, and M. Puglia, RFID: A Guide to Radio Frequency
Identification, John Wiley & Sons, New York, NY, USA, 2007.
2. J. S. Colburn, “Patch antennas on externally perforated high dielectric constant
substrates,” IEEE Transactions on Antennas and Propagation, vol. 47, no. 12, pp.
1785–1794, 1999.
3. Y. L. Chow and K. L. Wan, “Miniaturizing patch antenna by adding a shorting pin
near the feed probe—a folded monopole equivalent,” in Proceedings of the IEEE
Antennas and Propagation Society International Symposium, vol. 4, pp. 6–9, June
2002.
4. M.H. Song and J. M.Woo, “Miniaturization of microstrip patch antenna using
perturbation of radiating slot,” Electronics Letters, vol. 39, no. 5, pp. 417–419,
2003.
5. RFID (Radio Frequency Identification): Principles and Applications Stephen A.
Weis MIT CSAIL
6. M.I. Sabran, S.K.A. Rahim, A.Y.A. Rahman, T.A. Rahman, M.Z.M. Nor, and
Evizal, “A Dual-Band Diamond-Shaped Antenna for RFID Application,” IEEE
Antennas and Wireless Propagation Letters, Vol. 10, 2011, pp. 979 –982,2011.

21. Cont’d…
7. Guo Liu, Liang Xu, and Zhensen Wu “Miniaturized Circularly Polarized
Microstrip RFID Antenna Using Fractal Metamaterial”Hindawi Publishing
Corporation International Journal of Antennas and Propagation Volume 2013,
Article ID 781357, 4 pages,2013.
8. Yuan Yao, Youbo Zhang, Junsheng Yu, and Xiaodong Chen “Compact and
Circular Polarized RFID Antenna forPortable Terminal Applications”Hindawi
Publishing Corporation International Journal of Antennas and Propagation
Volume 2013, Article ID 982813, 6 pages,2013.
9. Constantine A. Balanis, 2005 A Hand book on “Antenna Theory: Analysis and
Design (3rd Edition)” John Wiley & Sons.
10. Daniel D. Deavours, Mutharasu Sivakumar “Microstrip antenna for RFID device
having both far-field and near-field functionality” US Patents no 20140008447
A1,2010.