Ultra-Wideband Microstrip Antennas with WLAN Band-Notch Capability

The presented paper exhibits the design configuration of Microstrip Line (MS)-fed and Co-Planar Waveguide (CPW)-fed symmetrical staircase shaped, planar monopole Ultra Wideband (UWB) antennae with WLAN band rejection characteristic having sized 30x30x1.6mm. The staircase pattern in the radiating patch and the feed line’s Ushaped slot are used to achieve the UWB and notch the 5GHz WLAN band, respectively. For the MS-fed antenna with partial ground plane, a slot is introduced in the ground which is used for impedance matching and it enhances the effect of WLAN band-notch as well. The proposed antennae have achieved the 3.1GHz-10.6GHz UWB frequency range. In between this UWB range, the 5GHz WLAN band (5.15GHz-5.35GHz and 5.725GHz-5.825GHz) is notched effectively to avoid interference with UWB. FR4 substrate, having relative permittivity of 4.4 and thickness of 1.6mm, is used to print these antennae. Moreover, the fabricated prototype antennae show good simulation and measurement results.