Premium
Microstrip stepped‐impedance resonator bandpass filter with over‐coupling structure for suppression of harmonic response
Author(s) -
Weng MinHung,
Pan ChiHsiang,
Shao ChihWei,
Wu HungWei,
Huang TsungHui
Publication year - 2004
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.20069
Subject(s) - stopband , band pass filter , microstrip , resonator , electronic engineering , electronic filter topology , m derived filter , elliptic filter , prototype filter , band stop filter , distributed element filter , filter (signal processing) , waveguide filter , voltage controlled filter , acoustics , engineering , low pass filter , physics , electrical engineering
This paper describes the microstrip stepped‐impedance resonator (SIR) bandpass filter with an over‐coupling structure for the suppression of spurious response at twice the center frequency (2f 0 ). In addition, the tapped I/O is used in the filter to create the extra transmission zeros to further improve stopband rejection. First, conventional approximate design formulas of microstrip SIR are also presented to predict the filter performance, and then the EM simulation is used to optimize the filter performance. The designed bandpass filters have a wide upper stopband with satisfactory attenuation levels. The experimental results of the two designed filters are in good agreement with the theoretical predictions and simulated results. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 130–133, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20069