Broadband Circularly Polarized Antennas with Improved Gain

Authors

  • Meizhen Xiao The School of Electronic and Information Engineering South China University of Technology, Guangzhou, 510641, China
  • Hui Liu The School of Electronic and Information Engineering South China University of Technology, Guangzhou, 510641, China
  • Yuehui Cui The School of Electronic and Information Engineering South China University of Technology, Guangzhou, 510641, China

Keywords:

Broadband antenna, circularly polarized antenna, differentially-fed antenna

Abstract

A broadband circularly polarized (CP) antenna with improved gain is proposed. The broadband CP antenna consists of two folded off-center-fed dipoles. Due to the two-dipole configuration, the antenna gain is improved by almost 2 dB. It is shown by simulation and experiment that the broadband CP antenna achieves an impedance bandwidth of 52% (1.71-2.89 GHz) for reflection coefficient<-15 dB and an axial ratio (AR) bandwidth of 45% (1.75-2.73 GHz) for AR<3 dB. The average antenna gain is about 10 dBi. A differentiallyfed broadband CP antenna is also developed. Simulated and measured results show that the differentially-fed CP antenna fulfills an impedance bandwidth of 60% (1.53-2.83 GHz) for differential reflection coefficient <-15 dB and a 3-dB AR bandwidth of 44% (1.76-2.75 GHz). The average antenna gain is about 10 dBi. The gain-improved broadband CP antennas feature a simple planar configuration, which are suitable for applications in satellite/wireless communications.

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Published

2019-10-01

How to Cite

[1]
Meizhen Xiao, Hui Liu, and Yuehui Cui, “Broadband Circularly Polarized Antennas with Improved Gain”, ACES Journal, vol. 34, no. 10, pp. 1514–1519, Oct. 2019.

Issue

2019: Vol 34 Iss 10

Section

Articles