Curved strip dipole antenna on EBG reflector plane for RFID applications

  • Authors:

  • N. Fhafhiem;P. Krachodnok;R. Wongsan

  • Affiliations:

  • School of Telecommunication Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand;School of Telecommunication Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand;School of Telecommunication Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand

  • Venue:
  • WSEAS TRANSACTIONS on COMMUNICATIONS
  • Year:
  • 2010

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Abstract

This paper presented the study and design the curved strip dipole on Electromagnetic Band Gap (EBG) reflector plane that can be affected the performance of the proposed antenna for RFID application. The proposed antenna consists of a strip dipole that constructed of a metallic sheet and it was bended to be a half of annular with feed point at the center for yielding wider beamwidth. Normally, a curved strip dipole antenna without the reflector provides low gain of 1.5 dB, due to its features of radiation patterns, both in azimuth and elevation planes. In our case, the resonant EBG technology has been used to be a reflector for directive gain increment by utilizing the good performances of EBG structure, which is capable of providing a constructive image current within a certain frequency band. Therefore, when this curved dipole is appropriated located horizontally on a resonant EBG reflector, the low profile antenna that provides good performance such as large beamwidth, wide bandwidth, and high directive gain can be obtained, consequently. The first curved strip dipole antenna with 3×3 elements and the second one with 5×5 elements of EBG reflectors, respectively, have been fabricated and their RF performances have been measured. For 3×3 elements of EBG reflector, the measured beamwidth in E- and H-planes are 100° and 110°, respectively, frequency bandwidth is 2.06-2.59 GHz and directive gain is 7.45 dBi at 2.45 GHz. In case of 5×5 elements of EBG reflector, the measured beamwidth in E- and H-planes are 65° and 120°, respectively, frequency bandwidth is 2.06- 2.62 GHz and directive gain is 7.65 dBi at 2.45 GHz. From simulation and experimental results, it's obvious that many applications can be conceived for a curved strip dipole on EBG reflector plane due to its geometrical and electromagnetic features.