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The microwave dielectric properties of (Mg(1-x)Cox)2SnO4 ceramics were examined with a view to their exploitation for mobile communication. The (Mg(1-x)Cox)2SnO4 ceramics were prepared by the conventional solid-state method with various sintering temperatures. The X-ray diffraction patterns of the (Mg(1-x)Cox)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 (ετ) of 8.8, a quality factor (Q × f) of 110800 GHz (at 16.4 GHz), and a temperature coefficient of resonant frequency (τf) of -66 ppm/°C were obtained for (Mg(1-x)Cox)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.