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![PDF] FREQUENCY-TUNABLE INTERNAL ANTENNA FOR MOBILE PHONES | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/c6311d793629e611dd1c065ad6aea571989a933b/4-Figure1-1.png "PDF] FREQUENCY-TUNABLE INTERNAL ANTENNA FOR MOBILE PHONES | Semantic Scholar")
PDF] FREQUENCY-TUNABLE INTERNAL ANTENNA FOR MOBILE PHONES | Semantic Scholar
How can a very small antenna exist in mobile phones? - Quora
