Presently, the wireless communication system technologies are rapidly growth, which is a reason to develop the multiple operating frequencies in the systems.
Especially, the front end RF part is that antenna has to support the multiple operating
frequencies in the system too.
Therefore, the multiband antennas were proposed in [1-3] to support the presently applications of wireless communication systems, including WLAN IEEE 802.1 I alblg (2.4 - 2.484 GHz and 5.15 - 5.35 GHz), WiMAX IEEE 802.16a (3.3 - 3.8 GHz), and IMT advance system or 4th generation (4G) mobile communication system (3.4 - 4.2 GHz).