Department of Electrical Engineering, Lunghwa University of Science and Technology, Gueishan Shiang, Taoyuan County, Taiwan.
IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Dec;58(12):2531-8. doi: 10.1109/TUFFC.2011.2116.
The microwave dielectric properties of (Mg((1-x))Co(x))(2)SnO(4) ceramics were examined with a view to their exploitation for mobile communication. The (Mg((1-x))Co(x))(2)SnO(4) ceramics were prepared by the conventional solid-state method with various sintering temperatures. The X-ray diffraction patterns of the (Mg((1-x))Co(x))(2)SnO(4) ceramics revealed no significant variation of phase with sintering temperatures. Specimens were not single-phase materials; small amounts of MgO and SnO(2) as the second phases were observed in all specimens. A dielectric constant (ε(τ)) of 8.8, a quality factor (Q × f) of 110800 GHz (at 16.4 GHz), and a temperature coefficient of resonant frequency (τ(f)) of -66 ppm/°C were obtained for(Mg(0.93)Co(0.07))(2)SnO(4) ceramics that were sintered at 1550°C for 4 h. The proposed dual-band co-planar waveguide (CPW)-fed inverted-E-shaped monopole covered the industrial, scientific, medical (ISM), high-performance radio local area network (HIPERLAN), and unlicensed national information infrastructure (UNII) bands. A 13.62% bandwidth (return loss <;10 dB) of 2.43 GHz, and a 20.69% bandwidth (return loss <;10 dB) of 5.38 GHz was successfully achieved.
（Mg((1-x))Co(x))(2)SnO(4)陶瓷的微波介电性能进行了研究，以期将其应用于移动通信。（Mg((1-x))Co(x))(2)SnO(4)陶瓷采用传统的固态法制备，烧结温度不同。（Mg((1-x))Co(x))(2)SnO(4)陶瓷的 X 射线衍射图谱表明，随着烧结温度的变化，其物相没有明显的变化。样品不是单相材料；在所有样品中都观察到少量的 MgO 和 SnO(2)作为第二相。在 1550°C 烧结 4 h 的(Mg(0.93)Co(0.07))(2)SnO(4)陶瓷，介电常数(ε(τ))为 8.8，品质因数(Q×f)为 110800 GHz（在 16.4 GHz 时），谐振频率温度系数(τ(f))为-66 ppm/°C。所提出的双频共面波导（CPW）馈电倒置 E 形单极天线覆盖了工业、科学、医学（ISM）、高性能无线局域网（HIPERLAN）和无许可证国家信息基础设施（UNII）频段。成功实现了 2.43 GHz 时 13.62%的带宽（回波损耗<10 dB）和 5.38 GHz 时 20.69%的带宽（回波损耗<10 dB）。
