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An antenna system for WiMAX (Worldwide Interoperability for Microwave Access Forum) mobile phones with the E911 function for locating wireless users is presented. The antenna system comprises a wideband stubby metal-plate monopole antenna for WiMAX or IEEE 802.16e operation in the frequency bands between 2 and 6 GHz and an internal planar inverted-F antenna (PIFA) for global positioning system (GPS) operation at 1575 MHz for the E911 function. In addition, the two antennas for WiMAX and GPS operations show good isolation with S21 < −20 dB over the operating bands.
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Liu et al. (2005) studied this question.
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