The thickness resonance of the bandpass frequency selective surface using high-permittivity dielectric materials

摘要

Summary form only given. In this letter, the research on the thickness resonance of the dielectric materials using high-permittivity dielectrics is proposed based on effective medium theory. Unlike conventional bandpass FSSs, such FSS is composed of high-permittivity dielectrics plates rather than metallic or dielectric materials with structures. Strong electric and magnetic resonances are introduced to produce drastic changes of effective parameters, leading to impedance match and bandpass response. The bandpass response can be tailored by adjusting the thickness of the dielectrics plates or the permittivity of the dielectric materials. As an example, a bandpass FSS using Ba0.4Sr0.6TiO3 doped by 0.53 Mg2TiO4, with a relative permittivity εr = 63, and a loss tangent tan δ = 0.003 at microwave frequencies. Theoretical analysis shows that the bandpass response arises from impedance matching by occurrence of electric and magnetic resonances. In addition, effective electromagnetic parameters and the dynamic induced field distributions are analyzed to explain the mechanism of the impedance matching.