A SMALL PRINTED DUAL-BAND ANTENNA FOR MOBILE PHONES

Abstract

A small printed antenna is proposed for dual-band applications. The antenna is patterned on the front of an 0.8-mm FR4 substrate to obtain a low-frequency resonance and a stub is patterned on the back of the substrate to obtain a high-frequency resonance. The antenna without ground plane is small (8 X 35 mm), and it is suitable to operate as an internal antenna. For S-H less than -6 dB, the antenna operates at 900 MHz with a bandwidth of 66 MHz, and at 1.8 GHz with a bandwidth of 130 MHz. Maximum radiation efficiencies were 52% at both 900 MHz and 1805 MHz. (C) 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1699-1702, 2009; Published online in Wiley Interscience (www.interscience.wiley.com). DOI 10.1002/mop.24415