An NCNU-shape planar antenna for multiband applications

NCNU is the abbreviation of our university, National Chi Nan University. This paper proposes a planar antenna with an NCNU shape. The proposed antenna is fed by a 50 ohms microstrip with width 3 mm, a unique and meaningful shape patch, and an asymmetrical ground plane. The antenna is investigated by both simulation and measurement. The bandwidth and resonant frequency of the proposed antenna are mainly affected by an NCNU-shaped radiating patch and a rectangular ground plane. Simulation results show that the antenna exhibits three main resonances around 2.45 GHz, 3.5 GHz, and 5.6 GHz covering several present wireless communication systems, i. e. 3.55 GHz (3.3 GHz-3.7 GHz) of world interoperability for microwave access (WiMAX), and 2.45 GHz (2.4 GHz-2.484 GHz) and 5.2 GHz/5.8 GHz (5.185 GHz-5.35 GHz/5.725 GHz-5.875 GHz) of wireless local area network (WLAN). Details of the antenna design are described, and results of some prototypes are presented and discussed.