Open AccessDual‐Transmission‐Line Microstrip Equiripple Lowpass Filter with Sharp Roll‐Off
Author(s) -
Velidi Vamsi Krishna,
Sanyal Subrata
Publication year - 2011
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.11.0210.0497
Subject(s) - stopband , low pass filter , microstrip , transmission line , bandwidth (computing) , electronic engineering , elliptic filter , control theory (sociology) , acoustics , band stop filter , engineering , band pass filter , physics , computer science , electrical engineering , telecommunications , control (management) , artificial intelligence
A novel application of a dual‐transmission line is proposed to design a lowpass filter (LPF). The proposed structure uses only transmission line elements to produce an equiripple LPF response with sharp roll‐off. Design equations are derived using a lossless transmission line model. Controlling the electrical lengths, three transmission‐zeros are realized in the stopband to obtain a sharp roll‐off rate and wide stopband bandwidth. A single unit microstrip LPF with a 3‐dB cut‐off frequency at 1.0 GHz having a roll‐off of 135 dB/GHz along with a stopband bandwidth of 69.5% is designed for validation.