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This letter proposes a radiation efficiency enhancement technique using a lumped inductor for a dual‐mode mobile phone.Two planar inverted‐F antennas (PIFAs) with a collinear arrangement are used for dual‐mode operation at the CDMA band of 824–894 MHz and GSM band of 880–960 MHz. Each antenna is separately connected to a lumped inductor of 4.7 nH. The electric field is more confined on each inverted‐F...
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