A compact CPW-fed UWB antenna with quadruple rejected bands

A compact coplanar-waveguide (CPW)-fed ultrawideband (UWB) antenna with quadruple rejected bands is proposed. To realize the bandwidth requirement of UWB communication, a gradient folk-shaped radiating patch and a symmetrical ground plane are employed, which help to cover a frequency band from 2.7 to 10.7 GHz. In order to obtain four rejected bands within the UWB frequency band, four different slots including a cap-shaped slot, two meandering slots, and a split-ring are utilized, which contribute to generate rejected bands at C-band (3.60-4.32 GHz), wireless local area networks bands (5.17-5.32 GHz and 5.80-5.93 GHz), and International Telecommunication Union service band (7.8-8.2 GHz), respectively. Excellent band-notched features are obtained by optimizing the positions and lengths of the four slots. Simulated and measured results show that the proposed antenna is especially suitable for UWB communication.