Rapid developments of various Wireless Local Area Network (WLAN)
protocols have sparked the requirements for miniaturized multi-band
antennas. Today, the most wide spread WLAN protocols are IEEE
802.11b/g, which utilizes the 2.4 GHz ISM band (2.4–2.485 GHz), and
IEEE 802.11a which employs the 5 GHz U-NII band and ISM band
(5.15–5.825 GHz). For system flexibility and feasibility,