A miniaturized ultra wideband antenna with single tunable band-notched characterisrics

A miniaturized planar ultra wideband (UWB) monopole antenna is presented in this paper. By etching a C-shaped slot in the radiating patch, a band-rejected filtering properties in the WLAN band is achieved. By changing the thickness of the C-shaped slot, the notched frequency changes. An equation is introduced to calculate the thickness of the slot corresponding to a required notched frequency. The proposed antenna is compact in size with an overall dimensions of 20 mm × 18 mm and it is fed by a 50Ω microstrip transmission line. The antenna is fabricated on FR4 dielectric substrate with ε_r=4.4 and height h=1.5 mm. There is a good agreement between the measured return loss and the simulated one. The antenna operates in the frequency band 2.8-12.2 GHz with omnidirectional radiation pattern.