A compact hybrid antenna consisting of two PIFAs and a slot antenna is proposed for ultra-thin mobile phone applications. The antenna has a very compact volume of 46×10×4.2 mm3, and it operates at GSM 850/900, DCS, PCS, and UMTS bands, simultaneously. Results show that its bandwidth and efficiency are sufficient for these penta-band mobile phone applications.
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Rhyu et al. (2009) studied this question.
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