Wideband circularly polarized AMC reflector backed aperture antenna

Kush Agarwal*, Nasimuddin, Arokiaswami Alphones

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

92 Citations (Scopus)


A wideband, circularly polarized (CP), artificial magnetic conductor (AMC) reflector backed octagonal-shaped aperture (OSA) antenna is proposed for unidirectional radiation. The proposed antenna consists of an OSA fed by microstrip along with L-shaped stub and an AMC reflector. Bidirectional radiation of OSA antenna is changed to unidirectional radiation using an AMC reflector. The antenna height measured from the upper surface of the AMC reflector to OSA radiator is chosen to be small to realize a low-profile antenna: 0.0825λo at the lowest analysis frequency of 4.5 GHz. Three different surfaces are studied and compared as back reflectors for OSA: perfect electric conductor (PEC), single layered AMC surface, and double layered AMC surface. The OSA with double-layered AMC surface demonstrates the largest measured 3-dB axial ratio bandwidth of 33.2% (5.20-7.19 GHz) with impedance bandwidth of 36.2% (5.04-7.21 GHz) for VSWR of 2. Almost constant gain of around 7 dBic is achieved over the band for the overall antenna volume of 0.72λo× 0.60λo× 0.19λo at the center frequency of 6.0 GHz.

Original languageEnglish
Article number6353161
Pages (from-to)1456-1461
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Issue number3
Publication statusPublished - 2013
Externally publishedYes


  • Aperture antenna
  • artificial magnetic conductor reflector
  • circular polarization
  • low-profile structure
  • unidirectional
  • wideband operation

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