Adjustable multi-band antenna and methods
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United States of America Patent
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Jan 14, 2014
Grant Date -
May 5, 2011
app pub date -
Aug 20, 2008
filing date -
Aug 30, 2007
priority date (Note) -
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Abstract
An adjustable multi-band planar antenna especially applicable in mobile terminals. In one embodiment, the feed of the antenna is connected by a multiple-way switch to at least two alternative points of the radiator element. When the feed point is changed, the resonance frequencies and thus the operating bands of the antenna change. In addition to varying the basic dimensions of the antenna, the distance between one feed point to another and a possible short-circuit point in the radiator, the value of the series capacitance produced by a reactive circuit that is formed between the feed point and switch, and the distance between the ground plane and the radiator, are parameters that may affect the antenna design.
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