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RFID Basics: Antenna Polarisation

Posted: 23 Oct 2007     Print Version  Bookmark and Share

Keywords:antenna polarisation  UHF RFID  circular polarisation 

This article, which is part of the book providing the basics on RF and RFID, covers antenna polarisation. The polarisation of a simple wire antenna is easy to establish by inspection. The polarisation of a commercial antenna, particularly when encased in a plastic radome, is not so obvious, and the user must usually refer to the labelling on the antenna or the manufacturer's data sheets, or use a linearly polarised tag to test the polarisation of the radiated field. Antennas more complex than simple dipoles may not have the same polarisation in all directions; circular polarisation often becomes elliptical as the direction of observation moves away from the axis of the main beam.

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