A small wideband patch antenna with a modified half U-slot is presented. The antenna has an impedance bandwidth of 40%( S₁₁<-10\ dB), which is from 1.72 to 2.58 GHz. The antenna size is electrically and physically small, which is0.012λ₀²and 240 mm², respectively. The proposed small antenna has good radiation characteristics, with a peak gain of 2 dBi. The proposed antenna is suitable for small wireless devices with the applications of Wi-Fi, Bluetooth, UMTS, GSM 1800, PCS 1900, and LTE.
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Wang et al. (2012) studied this question.
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