![PDF] A Compact and Wideband Quadrifilar Helical Antenna Designed for RFID Readers | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/3d8ad66ac7f63a5176319df35c8edeac0bf9ba0f/2-Figure2-1.png "PDF] A Compact and Wideband Quadrifilar Helical Antenna Designed for RFID Readers | Semantic Scholar")
PDF] A Compact and Wideband Quadrifilar Helical Antenna Designed for RFID Readers | Semantic Scholar
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