Low-profile ultra-wideband antenna for mobile phone applications

A novel low-profile ultra-wideband (UWB) antenna suitable for mobile-phone applications as an internal antenna is presented. The proposed antenna mainly comprises a planar metal-plate monopole folded into a low-profile structure and a matching tuning portion for achieving a very wide operating bandwidth (about 1.89–10.14 GHz in this study). With the very wide bandwidth obtained, the proposed antenna can easily cover the UMTS (1920–2170 MHz) band for mobile communications and the 2.4-GHz (2400–2484 MHz) and 5.2/5.8-GHz (5150–5350/5725–5875 MHz) bands for WLAN communications. Characteristics of the proposed UWB antenna applied to a UMTS/WLAN mobile phone are presented. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 43: 7–9, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20358