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![PDF] A simple and practical impedance matching network for quadrifilar helix antenna | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/547af68c6d19bbda2ae28d3046230fb4ad6f40f3/1-Figure1-1.png "PDF] A simple and practical impedance matching network for quadrifilar helix antenna | Semantic Scholar")
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