High dielectric constant and low loss microwave dielectric ceramics of (1 − y)(Mg_0.95Co_0.05)₂(Ti_0.95Sn_0.05)O₄–y(Ca_0.61Nd_0.8/3)TiO₃ for microwave applications

Abstract

High-quality (1 − y)(Mg_0.95Co_0.05)₂(Ti_0.95Sn_0.05)O₄–y(Ca_0.61Nd_0.8/3)TiO₃ ceramics were prepared by solid-state reaction. The products were characterized by scanning electron microscopy, X-ray diffraction, and network analyzer. (Mg_0.95Co_0.05)₂(Ti_0.95Sn_0.05)O₄ (MCTS) has a dielectric constant (ε_r) of ∼14.7, a high quality factor (Q×f) of ∼330, 134 GHz, and a temperature coefficient of resonant frequency (τ_f) of ∼ −46 ppm/°C. 0.48 MCTS −0.52CNT has an excellent combination of microwave dielectric properties: ε_r ∼ 28.58, Q×f ∼ 208027 GHz (at 9 GHz), and τ_f ∼ −4.38 ppm/°C sinter at 1325°C, and can be utilized in the fabrication of microwave devices. Therefore, a band-pass filter is designed and simulated using the proposed dielectric to study its performance.