Abstract
In this letter, a planar slot antenna with dual-band-notch characteristics is proposed for ultrawideband application. The basic antenna comprises a rectangular tuning stub and a ground plane with a tapered-shape slot. To create a notched band for WiMAX, one angle-shaped parasitic slit is etched out along with the tuning stub, while for WLAN, two symmetrical parasitic slits are placed inside the slot of the ground plane. By properly adjusting the size and location of the parasitic slits, it is found that the proposed antenna can achieve ultrawide operating band with dual-notched band without altering the overall antenna size. These notched bands will help to mitigate the possible interference between UWB and these narrow bands.