Coplanar printed-circuit antenna with band-rejection elements for ultra-wideband filtenna applications

In this paper, a coplanar printed-circuit UWB antenna with three different band-rejection elements for filtenna applications is proposed. The notched frequency bands of the proposed filtennas cover the WLAN frequency range for interference reduction between UWB and WLAN systems. The notched frequency bands of u-shaped and n-shaped slots can be easily adjusted by changing the total length of the slot. However, better stopband performance is achieved by using a bandstop filter in the coplanar feed line of the UWB antenna.