Microwave Dielectric Properties of (Mg(1-x)Cox)2SnO4 Ceramics for Application in Dual-Band Inverted-E-Shaped Monopole Antenna

The microwave dielectric properties of (Mg(1-x)Cox)(2)SnO4 ceramics were examined with a view to their exploitation for mobile communication. The (Mg(1-x)Cox)(2)SnO4 ceramics were prepared by the conventional solid-state method with various sintering temperatures. The X-ray diffraction patterns of the (Mg(1-x)Cox)(2)SnO4 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 (epsilon(r)) of 8.8, a quality factor (Q x f) of 110 800 GHz (at 16.4 GHz), and a temperature coefficient of resonant frequency (tau(f)) of -66 ppm/degrees C were obtained for (Mg0.93Co0.07)(2)SnO4 ceramics that were sintered at 1550 degrees 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.