title: Microwave dielectric properties of (Mg(1-x)Cox)2SnO4 ceramics for application in dual-band inverted-E-shaped monopole antenna.
abstract: 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.
authors: Department of Electrical Engineering, Lunghwa University of Science and Technology, Gueishan Shiang, Taoyuan County, Taiwan. EE049@mail.lhu.edu.tw
authors: Yih-Chien
authors: YC
authors: Chen
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008872:Microwaves; D013685:Telecommunications / Q000295:instrumentation*; D014159:Transducers