Filtering wideband slot antenna using split-ring resonator

This paper presents a wideband slot antenna with filtering response based on split-ring resonator (SRR). A T-shaped coplanar waveguide (CPW)-fed is utilized to excite the SRR and the slots near the SRR. Hence, multiple current paths of different lengths are induced, making the proposed antenna have wideband performance. Additionally, thanks to the symmetry of the proposed antenna, high cut-off frequency is achieved in realized gain response. To obtain the low cut-off frequency, two modified U-shaped stubs are introduced near the feeding line. Therefore, the proposed antenna could realize filtering function without any extra circuits and matching stubs.