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This paper describes the improvement of skirt characteristics of a bandpass filter (BPF) by using mixed tapped resonators. In this paper, we try to examine the transmission characteristics of the BPFs with a function to control the number of attenuation poles based on the use of a λ/2 resonator and a λ/4 resonator as the basics of the distributed constant line resonators. As a result, we have confirmed that realization of the attenuation poles than the number of the resonators, choice of the numbers of the realized poles and their location control. The miniaturization of the presented BPF is also accomplished as well as the location of the attenuation poles mentioned above. It has been confirmed that our proposal enables the control of the number of attenuation poles of the BPF.

Realization and Location Control of Attenuation Poles by Bandpass Filters Using Mixed Resonators