A novel compact dual-band bandstop filter with enhanced rejection bands

Ayyoub El Berbri (Moulay Ismail University)
Hassna Agoumi (Moulay Ismail University)
Seddik Bri (Moulay Ismail University)
Youssef El Amraoui (Moulay Ismail University)
Adil Saadi (Moulay Ismail University)

TELKOMNIKA (Telecommunication Computing Electronics and Control)
Vol 21, No 5: October 2023

In this paper, we present the design of a new wide dual-band bandstop filter (DBBSF) using nonuniform transmission lines. The method used to design this filter is to replace conventional uniform transmission lines with nonuniform lines governed by a truncated Fourier series. Based on how impedances are profiled in the proposed DBBSF structure, the fractional bandwidths of the two 10 dB-down rejection bands are widened to 39.72% and 52.63%, respectively, and the physical size has been reduced compared to that of the filter with the uniform transmission lines. The results of the electromagnetic (EM) simulation support the obtained analytical response and show an improved frequency behavior.