In this article, compact quad-band band-pass filters are realized by using stepped-impedance coupled-line quad-mode resonators (SICLQMRs). The compactness of the quad-mode resonator relies in its folded structure without extra space between the parallel lines. Unlike stepped-impedance resonators, SICLQMRs provide more design freedoms for controlling the four resonating frequencies since the even- and odd-mode equivalents can be separately assigned with characteristic impedances. Internal and external couplings are also parallel couplings, resulting in very compact dimensions of the filters. Simulated and measured S parameters are compared with good agreement, demonstrating the feasibility of the design.
Compact quad-band band-pass filters using stepped-impedance coupled-line resonators
Tomassoni C.;
2020
Abstract
In this article, compact quad-band band-pass filters are realized by using stepped-impedance coupled-line quad-mode resonators (SICLQMRs). The compactness of the quad-mode resonator relies in its folded structure without extra space between the parallel lines. Unlike stepped-impedance resonators, SICLQMRs provide more design freedoms for controlling the four resonating frequencies since the even- and odd-mode equivalents can be separately assigned with characteristic impedances. Internal and external couplings are also parallel couplings, resulting in very compact dimensions of the filters. Simulated and measured S parameters are compared with good agreement, demonstrating the feasibility of the design.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
