Analysis and design of compact dual-band bandstop filter using E-shaped resonators

This paper presents a compact dual-band bandstop filter (DBBSF) that features two controllable stopbands at 1.8 GHz and 5.2 GHz frequencies. A drastic reduction in size of the filter was achieved by taking advantage of a simplified architecture based on E-shaped resonator. The return losses of the simulated filter are measured to be -54.03 and -42.57 dB while the insertion losses are -0.01 and -0.10 dB at the respective stop bands. Due to its compact size and satisfactory stopband performance, the filter can be useful for modern communication technology.