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Excitation of a broadband circularly polarized and arrow-shaped dipole antenna with high gain by an improved hybrid coupler

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  • B. Wang
  • J.-J. He
  • J.-D. Kang

Abstract

This paper proposed a novel wideband, circularly polarized crossed dipole antenna with high gain that utilizes an improved feeding work. The hybrid coupler exhibits both compact circuit configuration and a wide bandwidth (S11 ≤ −15 dB) of over 60% given a power distribution of −3.1 dB using a broadband coupled-line power divider and a 90° phase shifter with an impedance-open-stub. A phase deviation of 90° ± 5° was also observed over wideband. When excited by the wideband feed network, the circularly polarized crossed dipole antenna achieves an impedance bandwidth of 66.7% given S11 ≤ −15 dB and a 3 dB axial ratio bandwidth of 67%. Furthermore, the stable peak gain increased from 9 to 10.9 dBi between 1.07 and 1.7 GHz when a cylindrical cavity was connected to the ground. Moreover, the cross-polarization ratio in the wideband exceeds 25 dB. The simulated results of this study agree with the measured ones.

Suggested Citation

  • B. Wang & J.-J. He & J.-D. Kang, 2015. "Excitation of a broadband circularly polarized and arrow-shaped dipole antenna with high gain by an improved hybrid coupler," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 29(11), pages 1486-1496, July.
    • Handle: RePEc:taf:tewaxx:v:29:y:2015:i:11:p:1486-1496
    DOI: 10.1080/09205071.2015.1049714
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