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A novel planar monopole antenna capable of multi‐frequency operation at about 900, 1800, and 2450 MHz is presented. The monopole antenna occupies a small area of 6.5 × 50 mm 2 , and is easy to construct with low cost by printing on an FR4 substrate. The monopole antenna can be mounted perpendicularly to the system circuit board of a communication device so that a low profile to the system ground plane will result. In addition, the obtained impedance bandwidths of the proposed antenna at about 900, 1800, and 2450 MHz can cover the GSM (890–960 MHz), DCS (1710–1880 MHz), PCS (1850–1990 MHz), and WLAN (2400–2484 MHz) bands.
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Teng et al. (2003) studied this question.
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