Abstract
AbstractAn internal WWAN (824–960/1710–2170 MHz) handset antenna suitable to be disposed at a small notch of 35 × 6 mm2 in the system ground plane of the handset is presented.Also, the antenna has a low profile of 3 mm above the main circuit board on which the system ground plane is printed. That is, the antenna occupies a small volume of 35 × 6 × 3 mm3 or 0.63 cm3 only (much less than 1 cm3). To fit in the small notch, a quarter‐wavelength gap‐coupled loop antenna is applied, which not only can be configured into a compact configuration but also can be in proximity to the surrounding ground plane. With the aid of a matching network, which is comprised of a series chip inductor and a band‐stop matching circuit, two wide operating bands to, respectively, cover the GSM850/900 and GSM1800/1900/UMTS operation are obtained. Details of the proposed antenna are described. The applied techniques in achieving wideband operation with a small antenna size are discussed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2498–2503, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27125
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