Circular Slotted Reconfigurable Multiband patch Antenna for Wireless Applications

A novel circular slotted multiband antenna for wireless communication application is presented in this paper. The antenna design is quite simple, a defected ground structure (DGS) is created by a circular slots of different radii, 50 ohm feeding line as a radiator, and rectangular shape slit connected to a circular slots at ground plane. Moreover, reconfigurable multiband resonances are achieved by an appropriate placement of PIN diodes at the circular slots of defected ground plane and switching (ON/OFF) them according to requirement. The suggested antenna exhibits three tunable resonant frequency bands which includes 2.5/3.5/5.7 GHz used in WLAN/WiMax/UWB applications. The antenna is designed on FR4 substrate. It is compact with dimensions of 28 x 16 x 0.8 mm(3). The reconfigurable resonant frequency bands over a wide spectrum suggests that the proposed antenna design is appropriate candidate for different wireless communication applications.