Discussion
Why is a planar inverted F antenna common in mobile handsets?
Answer: B
Its quarter wave resonance makes it small, it lies flat against the board, and slots and parasitic branches let one structure cover several cellular bands. Efficiency is modest rather than the best available, the pattern is broad so the user's hand and head do absorb appreciably, and the phone's ground plane is an essential part of the radiating structure. Fitting the available volume, rather than maximising any single figure of merit, is what drives handset antenna design.
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