Design of Multiband Planar Antenna

In this paper, a low profile planar antenna for most of the used bands between 800MHz to 9GHz (10 bands) is designed. The antenna structure comprises L-type, C-type and inverted F-type. All of the bands showed the gain of over 2dBi and significant S11 parameters of below -10dBm. Additionally, all of them have significant 3-dB bandwidth. The technique used in this study ensured that by using a coupled-fed mechanism and a slotted ground structure, a multiband operation with wideband characteristic can be achieved. The influences of the modifications introduced into the ground plane as well as structure of all types of antenna, improved significantly the bandwidths of the designed antenna. We have presented the simulated results of radiation pattern, the gains, S11 parameters and discussed the results. The results observed can meet the requirements of practical mobile phones.