Circular slotted reconfigurable multiband patch antenna for wireless applications

Abstract

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 × 16 × 0.8 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . The reconfigurable resonant frequency bands over a wide spectrum suggests that the proposed antenna design is appropriate candidate for different wireless communication applications.