Microwave dielectric properties of (Mg(_1-x) Co_x)₂Sn0₄ ceramics for application in dual- band inverted-E-shaped monopole antenna

The microwave dielectric properties of (Mg(_1-x)Co_x)₂SnO₄ ceramics were examined with a view to their exploitation for mobile communication. The (Mg(_1-x)Co_x)₂SnO₄ 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)₂SnO₄ ceramics revealed no significant variation of phase with sintering temperatures. Specimens were not single-phase materials; small amounts of MgO and SnO₂ 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(_1-x)Co_x)₂SnO₄ 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.