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Axial ratio improvement of an Archimedean spiral antenna over a radial AMC reflector
Michael GRELIER, Christopher DJOMA, Michel JOUSSET, Stéphane MALLEGOL, Anne-Claire LEPAGE, Xavier BEGAUD

Last modified: 2012-01-07


This paper presents a method to improve the circular polarization of an Archimedean spiral antenna over a particular Artificial Magnetic Conductor (AMC). Results have been compared with the same antenna over a more classical AMC reflector. With this method the axial ratio is less than 2dB from 1.75GHz to 3.8GHz, whereas it is greater than 3dB with a classical shape AMC reflector.


axial ratio;artificial magnetic conductor;spiral antenna;reflector