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A novel internal antenna of planar monopole type is presented for broadband applications. The proposed antenna fed by a 50-/spl Omega/ microstrip line covers the digital cordless system (DCS, 1710-1880 MHz), personal communication system (PCS, 1750-1870 MHz), and international mobile telecommunication (IMT-2000, 1885-2200 MHz) bands within S/sub 11/<-10 dB. The antenna occupies a compact volume of 20/spl times/17/spl times/4.7 mm/sup 3/ and it is suitable to be built-in within the housing of a mobile phone. The bandwidth of the proposed antenna (VSWR<2) has 740 MHz starting from 1620 to 2360 MHz. The IE3D software and microwave studio (MWS) simulation are employed for optimizing the design parameters, and the simulation results are in agreement with those of the measured one, considering each associated case of the antenna itself, phone case, and battery.
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Shin et al. (2005) studied this question.
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