Wideband bandstop filters based on wideband 180° phase shifters

Design of Multi-Band Bandstop Filters Based on Mixed Electric and Magnetic Coupling Resonators

“…Therefore, the stopbands of the current multi-band bandstop filters are mainly concentrated in the dual bands. In [4][5][6][7][8][9][10][11][12][13][14], different techniques are presented to achieve the multi-band bandstop frequency response. For example, in [4][5][6][7][8][9], various researchers used different methods to implement dual-band BSFs.…”

“…In [4][5][6][7][8][9][10][11][12][13][14], different techniques are presented to achieve the multi-band bandstop frequency response. For example, in [4][5][6][7][8][9], various researchers used different methods to implement dual-band BSFs. In [4], Liu L achieved a dual-band BSF based on a parallel stub-loaded resonator, and high rejection in the stopband was achieved.…”

“…In [6], Dhakal R produced a dual-band BSF based on a meandered-line. In [7], BSFs were proposed based on phase shifters by Qiu L L. In [8], Zuo X realized a BSF with open-circuit stubs. In [9], Zhu Y employed a novel dual-band bandpass-to-bandstop filter using shunt PIN switches loaded on the transmission line.…”

A wideband dual‐band bandstop filter with flexible control of stopband rejection, bandwidth and centre frequency ratio

“…Bandstop filters (BSFs) [1–19] are important microwave components with frequency selection, and they are normally used to suppress signals within specific frequency bands. They are widely used in RF and microwave front‐ends, satellite communication systems, radar systems, and so on.…”

“…They are widely used in RF and microwave front‐ends, satellite communication systems, radar systems, and so on. Based on the frequency domain, BSFs can be classified into single‐band BSFs [1–6], dual‐band bandstop filters (DBBSFs) [7–17], or even multi‐band BSFs [18, 19]. In modern communication systems, the usage of non‐linear components such as amplifiers and mixers is extensive.…”