Open AccessMicrostrip filter with multiple transmission zeros using shorted stub loaded resonators
Author(s) -
Wu L.,
Shen W.,
Sun X.W.
Publication year - 2013
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.2013.3068
Subject(s) - stub (electronics) , microstrip , resonator , electronic engineering , acoustics , filtering theory , distributed element filter , materials science , filter (signal processing) , computer science , low pass filter , electrical engineering , engineering , prototype filter , physics , optoelectronics , algorithm
A novel microstrip bandpass filter with multiple transmission zeros is proposed, where two half‐wavelength resonators loaded by short‐circuited stubs are implemented into its design. A section of coupled lines and a grounded via‐hole are introduced to serve as a capacitor and an inductor, respectively. Then, four controllable transmission zeros can be successfully obtained, and the locations of two outer transmission zeros are controlled by the diameter of the via‐hole. A second‐order filter sample with better frequency selectivity and wide stopband was fabricated using standard printed circuit board (PCB) technology, and its measured S ‐parameters agree well with the simulated ones.