Title :
Comments on “A Quasi Elliptic Function 1.75–2.25 GHz 3-Pole Bandpass Filter With Bandwidth Control”
Author_Institution :
Inst. of Commun. Eng., PLAUST, Nanjing, China
Abstract :
In the above paper, a three-pole filter with tunable frequency and bandwidth is proposed based on a simple topology. The nonadjacent resonator coupling is introduced to generate a zero at the lower band for adjusting the bandwidth. Although the results are interesting, it appears that the design equations are mislabeled and the equivalent circuit model is inaccurate.
Keywords :
band-pass filters; elliptic filters; equivalent circuits; resonator filters; 3-pole bandpass filter; bandwidth control; equivalent circuit model; frequency 1.75 GHz to 2.25 GHz; nonadjacent resonator coupling; quasi elliptic function; three-pole filter; Bandwidth; Couplings; Equivalent circuits; Integrated circuit modeling; Mathematical model; Resonant frequency; Topology; Bandpass filter; nonadjacent resonator coupling; tunable bandwidth filter; tunable filter;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2014.2352603
