In order to minimize the potential interferences between the ultra-wideband systems and the narrowband communication systems effectively

a compact slot ultra-wideband antenna with assembled band notched structure is presented.A polygon slot on a printed circuit board is taken as the radiating element and is fed by a T-shaped stub.The overall size of the antenna is as small as 16mm×25mm×0.8mm.The assembled band-notch structure formed by a C-shaped slit in the T-shaped stub and a rectangular slit embedded in the ground plane is implemented to shape a much sharper

wider

and deeper notch-band.Simulated and measured results indicate that the proposed antenna yields an voltage standing wave ratio (VSWR) of less than 2 in the impedance bandwidth range of 3.1 to 10.6 GHz

except the bandwidth of 5.0~6.0 GHz for band notch.Thus

the negative effect of WLAN on ultra-wideband system is eliminated effetively.Omnidirectional radiation pattern and stable gain are obtained in the whole bandwidth range.