Open AccessCompact ultra‐wideband bandstop filter using capacitive loads
Author(s) -
Liu Baoguang,
Lyu YunPeng,
Zhu Lei,
Cheng Chonghu
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.1481
Subject(s) - capacitor , capacitive sensing , capacitive coupling , wideband , fractional bandwidth , bandwidth (computing) , band stop filter , electrical engineering , transmission line , electronic engineering , materials science , engineering , filter (signal processing) , band pass filter , voltage , telecommunications , low pass filter
A compact UWB band‐stop filter (BSF) using capacitive loads is proposed. In contrast to its traditional counterparts, this proposed BSF only consists of two capacitors and a short‐ended coupled line (C‐section). By introducing capacitors inside the C‐section and between two ports, respectively, cross‐coupling and source/load coupling are introduced to create up to four transmission zeros. Meanwhile, shunt capacitive effect of loaded capacitors can further reduce the length of C‐section. After working principle and design method of this proposed BSF are well‐illustrated, a prototype with 20 dB fractional bandwidth of 110% at 4.24 GHz is finally designed and fabricated. It occupies only 0.45 λ g × 0.061 λ g , where λ g is the guided wavelength at the centre frequency.