Internal hybrid antenna for multiband operation in the mobile phone

A new internal hybrid antenna formed by a printed open-ended slot (monopole slot) and a T-shaped metal-strip monopole (monopole T-strip) for multiband operation in the mobile phone is presented. The monopole slot is printed near the top edge of the system circuit board of the mobile phone and can generate a quarter- wavelength resonant mode at about 900 MHz,for GSM850/900 operation. The monopole T-strip is bent and mounted above the monopole slot and is used to excite a quarter-wavelength resonant mode at about 7900 MHz to cover DCS/PCS operation. The monopole slot and monopole T-strip are integrated to occupy a compact volume and can be fed using a simple 50 Omega microstrip line printed on the system circuit board. Obtained results indicate that it is promising to integrate two different types of antennas into an internal hybrid antenna for multiband operation in the mobile phone, and good performances of the hybrid antenna over the operating band can be achieved. 2007 Wiley Periodicals, Inc.