In this work, we propose a filter structure using a one-dimensional ferroelectric-dielectric periodic multilayer, air/[(ABA)Ns,C]Np(ABA)Ns/air,where Ns and Np are 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 Np narrower 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 Ns and Np.
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