LOW-PROFILE ULTRA-WIDEBAND ANTENNA FOR MOBILE PHONE APPLICATIONS

摘要

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.