Dual Band-Notched Square Monopole Antenna for Ultrawideband Applications

This letter proposes a novel printed monopole antenna for ultrawideband applications with dual band-notch function. The antenna consists of a square radiating patch with a pair of L-shaped slits, and an E-shaped slot and a ground plane with a V-shaped protruded strip, which provides a wide usable fractional bandwidth of more than 140% (2.89-17.83 GHz). In order to generate single band-notch characteristics, we use two L-shaped slits in the radiating patch. By adding an E-shaped slot in the center of the radiating patch, a dual band-notch function is achieved. Also, by inserting a V-shaped protruded in the ground plane, additional resonances are excited, and hence much wider impedance bandwidth can be produced, especially at the higher band. The measured results reveal that the presented dual band-notch monopole antenna offers a very wide bandwidth with two notched bands, covering all the 5.2/5.8-GHz WLAN, 3.5/5.5-GHz WiMAX and 4-GHz C-bands. The designed antenna has a small size area of 10 x 16 mm(2) mm, which has a size reduction of 35% with respect to the previous similar antenna.