INTERNAL MEANDERED LOOP ANTENNA FOR GSM/DCS/PCS MULTIBAND OPERATION IN A MOBILE PHONE WITH THE USER'S HAND

摘要

A novel internal meandered loop antenna for application in a mobile phone for Global System for Mobile Communication/Digital Communication System/Personal Communication System (GSM/DCS/ PCS) multiband operation is presented. Along the symmetric metal-strip loop structure of the antenna, there are meandered sections for adjusting the antenna's resonant frequencies and widened sections for improving the impedance matching. The antenna's first and second resonant modes (half- and one-wavelength modes) excited at about 900 and 1800 MHz for GSM/DCS operation. With the meandered sections in the loop structure, the antenna's third resonant mode (1.5-wavelength mode) can be adjusted to be close to the second resonant mode at 1800 MHz to achieve a wider upper band for DCS/PCS operation. In addition, the central region of the proposed loop antenna is unoccupied, which can be used to accommodate possible nearby electronic components, such as the lens of a digital camera. Furthermore, effects of the user's hand holding the mobile phone with the proposed loop antenna are analyzed in this study.