A traditional multi-band planar inverted-F (PIFA) antenna by a preferred embodiment makes use of an open slot loop or multi slot. The slots are formed to cause multiple frequency dependent nulls in the EM current field modal distribution. A built-in, low-profile antenna having a PIFA antenna and a parasitic element by top loading having a wide bandwidth to facilitate wireless mobile within a plurality of frequency bands is designed, disclosed and measured.
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