Effective permittivity of a fiber-reinforced composite with transversely isotropic constituents

► A dielectric composite of transversely isotropic periodic phases is considered. ► Four different orientations of the transverse symmetry axis are analyzed. ► Simple closed-form expressions for effective permittivity are found in all cases. ► Obtained formulas are compared with results from finite element calculations. ► It is concluded that formulas are valid beyond the assumed small anisotropy.