CST – Computer Simulation Technology

Wideband Circularly Polarized AMC Reflector Backed Aperture Antenna
Kush Agarwal, Nasimuddin, Arokiaswami Alphones
IEEE Transactions on Antennas and Propagation
Volume: 61, Issue: 3, March 2013
Aperture antenna, artificial magnetic conductor reflector, circular polarization, low-profile structure, unidirectional, wideband operation
Awideband, 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: 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 layeredAMC surface. TheOSAwith 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 at the center frequency of 6.0 GHz.

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