This article presents a new class of filters, conceived for the fabrication with additive manufacturing technologies, with a wide stopband. The resonators are made of a coaxial line where supports are the coupling elements between them. The wide stopband is obtained using two different solutions. The first is the use of stepped-impedance resonators, whereas the second is the use of quarter wavelength resonators. Several prototypes have been built, and the experimental results show the validity of the solution.
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Venanzoni et al. (2020) studied this question.
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