Open AccessRigorous design method for distributed‐element bandpass filter with reflectionless response at two ports
Author(s) -
Lee Gyuwon,
Lee Jongheun,
Lee Boyoung,
Lee Juseop
Publication year - 2021
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/ell2.12182
Subject(s) - stub (electronics) , band pass filter , filter design , filter (signal processing) , computer science , transmission line , electronic engineering , prototype filter , topology (electrical circuits) , engineering , electrical engineering , telecommunications , computer vision
This letter reports an accurate and rigorous design method for a distributed‐element reflectionless bandpass filter capable of producing a reflectionless response at two ports simultaneously. The design method relies on novel transmission‐line reflectionless filter prototypes. This work presents a stub‐based reflectionless filter prototype and its design formulas in terms of a target transmission response. It also provides a stub‐less coupled‐line reflectionless filter prototype equivalent to the stub‐based prototype in case where stubs are not feasible. A second‐order bandpass filter has been designed and fabricated to verify the design method. Reasonable agreement between the measured performance and the simulated one has been obtained, confirming that the proposed design is valid.