Open Access Open Access  Restricted Access Subscription or Fee Access

A Broadband Circularly Polarized Patch Antenna for UHF RFID Applications

K. Elayaraja, Roopa Jayasingh


A broadband circularly polarized patch antenna is proposed for UHF (840 – 960 MHz) RF Identification (RFID) reader applications. The antenna consists of two oblique thin slot cut square patches and a suspended microstrip line with open-circuited at the end. The feed for the main patch is given by four probes which are sequentially connected to the suspended microstrip feed line. It presents a systematic, empirical design technique to obtain optimum return loss, axial-ratio (AR) and gain. The stacked patches and feed line is surrounded by an air medium, the air medium act as a substrate. The conductivity is high. Parametric studies are carried out to demonstrate the effects of antenna geometry parameters on the performance. The proposed antenna can be a good reader for UHF RFID applications.


Radio Frequency Identification, Ultra High Frequency, Circular Polarization

Full Text:



Zhi Ning Chen, Xianming Qing and Hang Leong Chung, “A Universal UHF RFID Reader Antenna”, IEEE Trans. Microwave Theory and Tech., vol. 57, no.5, pp. 1275–1282, May 2009.

R. Want, “An introduction to RFID technology”, IEEE Pervasive Comput., vol. 5, no. 1, pp. 25–33, Jan.–Mar. 2006.

Sanjay Ahuja, Pavan Potti “An Introduction to RFID Technology”, Communications and Network, vol 2, pp. 183-186, Aug 2010.

C. A. Balanis, Antenna Theory: Analysis and Design, 3rd ed. New York: Wiley, 2005, pp. 859–864.

H. Barthel, “Regulatory status for u RFID in the UHF spectrum,” EPCGlobal, Brussels, Belgium, Sep. 2007. Available: 20070504.pdf.

P. Wang, G. Wen, J. Li, Y. Huang, L. Yang and Q. Zhang “Wideband Circularly Polarized UHF RFID Reader Antenna With High Gain And Wide Axial Ratio Beamwidths” Progress In Electromagnetics Research, Vol. 129, 365-385, 2012.

Microstrip Patch Antenna Design and Results online source.

“Design of Square Patch Microstrip Antenna for Circular Polarization using IE3D Software” thesis submitted by Amritesh, Kshetrimayum Milan Singh.

“Circularly Polarized Microstrip Antenna” thesis prepared by Marwa Shakeeb.

Kwok L.Chung, Anandha S.Mohan, “A Circularly Polarized Stacked Electromagnatically Coupled Patch Antenna”, IEEE Trans. Antennas and Propagation., vol. 52, no.5, pp. 1365-1370, May 2004.

Jaume Anguera, Enrique Martínez, Carles Puente, Carmen Borja, Jordi Soler, “Broad-Band Dual-Frequency Microstrip Patch Antenna With Modified Sierpinski Fractal Geometry”, IEEE Trans. Antennas and Propagation., vol. 52, no.1, pp. 66-73, JANUARY 2004.

RongLin Li, Dane Thompson, Manos M. Tentzeris, Joy Laskar, John Papapolymerou, “Development of aWide-Band Short Backfire Antenna Excited by an Unbalance-Fed H-Shaped Slot”, IEEE Trans. Antennas and Propagation., vol. 53, no.2, pp. 662-671, FEBRUARY 2005.

M. T. Islam,M. N. Shakib and N. Misran, “Design Analysis of High Gain Wideband L-Probe Fed Microstrip Patch Antenna”, Progress in Electromagnetics Research,PIER 95,397-407, 2009.

S. S. More,M. P. Turuk, “Compact Microstrip Antenna for RFID Application”, Progress in International Journal of Emerging Technology and Advanced Engineering, Volume 2, Issue 7, July 2012).

T.G.Abo-Elnaga,E.A.F.Abdallah,H.El-Hennawy “Universal UHF RFID Rose Reader Antenna”, Progress in PIERS Proceedings,Xi'an, China, 22-26,2010.


  • There are currently no refbacks.

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.