抄録
The dielectric properties of titanite-based ceramics at millimeter wave frequency range were investigated. The specimens were fabricated by usual solid sintering process. Part of Ti elements in titanite was replaced by Mn, Sn, and Zr. The specimens derived from nominal composition of CaTi0.95Zr0.05SiO5 had dielectric loss tangent, 0.22, and relative permittivity, 36. The plot of complex permittivity is exactly on the anti-reflection curve in ε'-ε" plane for a sheet of typical electromagnetic absorber. A sheet with thickness, 0.19 mm, had reflection loss of 32 dB at 58 GHz.
