A dual-band coupled-line bandpass filter and the prediction of its transmission poles and zeros

Abstract

This paper presents a dual-band coupled-line band-pass filter, which is simply composed by a three-section coupled line and two short-circuited stubs. By rigorous derivation, its transmission zeros and poles are extracted, and thus can be predicted. Finally, the simulations and experiments are carried out, and the results match well with the predicted ones.