title: Analysis of multigroup and multichannel filtering properties in a ferroelectric-dielectric periodic multilayer.
abstract: In this work, we propose a filter structure using a one-dimensional ferroelectric-dielectric periodic multilayer, air/[(ABA)NsC]Np(ABA)Ns/air, where Nsand Npare the two numbers of periods. Here, B is a dielectric material of SiO2, C is the same as B with a different thickness, and A is taken to be a ferroelectric material Ba55Sr45TiO3+30%Mg2SiO4, whose dielectric constant is very high (ϵ=439 at 10 GHz). The results show that the transmittance spectra have Ns-channel groups at microwave frequencies and these groups can be classified into two types. The first type has only one channel group with Npnarrower channels. The other has Ns-1 groups, each of which has Np+1 broader channels. In this filter structure the group number and channel number of each group can be determined simply by changing Nsand Np.
authors.forename: Tzu-Chyang
authors.initials: TC
authors.lastname: King
authors.forename: Ya-Wen
authors.initials: YW
authors.lastname: Li
authors.forename: Yu-Huai
authors.initials: YH
authors.lastname: Li
authors.forename: Chien-Jang
authors.initials: CJ
authors.lastname: Wu