Wideband Circularly Polarized Reflectarray Antenna Using Rotational Symmetrical Crossed Dipoles

Lehu Wen, Steven Gao, Qi Luo, Wei Hu, Benito Sanz-Izquierdo, Xue-xia Yang

Research output: Contribution to journalArticlepeer-review

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Abstract

A wideband circularly polarized (CP) reflectarray (RA) antenna using rotational symmetrical crossed dipoles is presented. This is the first time investigating coupled crossed dipoles as the unit cell for wideband reflection bandwidth in the CP RA design. Equivalent circuit analysis shows that when a CP wave impinges on the designed unit cell, two series resonances, and two parallel resonances are simultaneously excited on the crossed dipoles. Owing to these four different resonances, the CP reflection bandwidth is greatly improved and elaborately adjusted by controlling the coupling between the crossed dipoles. The CP reflection bandwidth ratio of the unit cell is enhanced up to 2:1 for $S_{x} < -15$ dB with a thin thickness of $0.12 \lambda {0}$. Based on this unit cell, a wideband -20° collimated CP RA antenna with a circular aperture of 316 unit cells was designed, fabricated, and measured for final performance verification. The measured results show that a wide CP bandwidth of 7.6-15.9 GHz is achieved with the axial ratio (AR) < 3 dB. In addition, the measured 3 dB gain bandwidth is better than 43.7% with a peak realized gain of 26.3 dBic and maximum aperture efficiency (AE) of 58.3%.
Original languageEnglish
Article number10054549
Pages (from-to)4576-4581
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Volume71
Issue number5
Early online date28 Feb 2023
DOIs
Publication statusPublished - 30 May 2023

Keywords

  • Reflection
  • Antenna measurements
  • Wideband
  • Scattering parameters
  • Reflector antennas
  • Dipole antennas
  • Broadband antennas
  • wideband array antenna
  • Circular polarization
  • reflectarray (RA) antenna
  • crossed dipoles

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