In this paper a novel compact multi-band printed coplanar waveguide (CPW)-feed antenna for wireless local area network (WLAN)/WiMAX/RFID applications is proposed. The proposed antenna is composed of a multi-triangular structure as metal ground plane and the radiation element with four different branches, both of the structures are printed on the same side of a substrate and the antenna is fed by a CPW. By carefully tuning the locations and the sizes of these four branches, the antenna can yield three different resonating frequencies to cover the desired bands for WLAN/WiMAX/RFID applications. The simulated and measured results demonstrate that the proposed antenna has the impedance bandwidth (for return loss less than -10dB) of 700MHz (2.2-2.9GHz), 540MHz (3.16-3.7GHz), and 850MHz (5.05-5.9GHz), respectively, which can cover the WLAN 2.4/5.8GHz bands, the WiMAX 2.5/3.5GHz bands, and the RFID 2.45/5.8GHz bands.
