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


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 Sx<-15 dB with a thin thickness of 0.12λ0. 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 <3 dB. In addition, the measured 3dB gain bandwidth is better than 43.7% with the peak realized gain of 26.3 dBic and the maximum aperture efficiency of 58.3%.
Original languageEnglish
Article number10054549
Pages (from-to)1-1
Number of pages1
JournalIEEE Transactions on Antennas and Propagation
Issue number99
Publication statusE-pub ahead of print - 28 Feb 2023


  • Reflection
  • Antenna measurements
  • Wideband
  • Scattering parameters
  • Reflector antennas
  • Dipole antennas
  • Broadband antennas


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