Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Wide-Beam Circularly Polarized Crossed Scythe-Shaped Dipoles for Global Navigation Satellite Systems

  • Ta, Son Xuat (Department of Electrical and Computer Engineering, Ajou University) ;
  • Han, Jea Jin (Department of Electrical and Computer Engineering, Ajou University) ;
  • Park, Ikmo (Department of Electrical and Computer Engineering, Ajou University) ;
  • Ziolkowski, Richard W. (Department of Electrical and Computer Engineering, University of Arizona)
  • Received : 2013.10.04
  • Accepted : 2013.11.20
  • Published : 2013.12.31
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Abstract

This paper describes composite cavity-backed crossed scythe-shaped dipoles with wide-beam circularly polarized (CP) radiation for use in Global Navigation Satellite Systems. Each branch of the dipole arm contains a meander line, with the end shaped like a scythe to achieve a significant reduction in the size of the radiator. For dual-band operation, each dipole arm is divided into two branches of different lengths. The dipoles are crossed through a $90^{\circ}$ phase delay line of a vacant-quarter printed ring to achieve CP radiation. The crossed dipoles are incorporated with a cavity-backed reflector to make the CP radiation unidirectional and to improve the CP radiation beamwidth. The proposed antennas have broad impedance matching and 3-dB axial ratio bandwidths, as well as right-hand CP radiation with a wide-beamwidth and high front-to-back ratio.

Keywords

References

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