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Abstract
In this paper, a broadband compact folded monopole antenna is proposed for mobile applications. The antenna is a simple structure of a folded rectangular patch with a slit, which occupies only a small space of 7 × 12 × 4 mm3 (0.054λ L × 0.092λ L × 0.031λ L at lower frequency edge of 2.3 GHz) on the top of no-ground portion of the substrate. The proposed antenna achieves a 10- dB impedance bandwidth of 49.2% ranging from 2.3 GHz to 3.8 GHz, which can cover the 2.4 GHz WLAN (2.4–2.4835 GHz) and WiMAX (2.3–2.4/2.495–2.69/3.4–3.6 GHz) operational bands. The low profile structure and broadband operation make the antenna a promising candidate for applications in mobile phones.