A novel thin internal planar antenna for GSM/DCS/PCS/UMTS quad-band operation in a PDA (personal digital assistant) phone is presented. The proposed internal antenna has a small thickness of only 3 mm, yet it is capable of providing two wide operating bands at about 0.9 and 2 GHz so as to meet the bandwidth requirements of the GSM/DCS/PCS/UMTS systems. Details of the design considerations of the proposed antenna are described, and the experimental results of the constructed prototype are presented.
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Wong et al. (2005) studied this question.
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