The present communication investigates the dielectric response of the Sr9Ce2Ti12O36 ceramics loaded high density polyethylene and epoxy resin. Sr9Ce2Ti12O36 ceramic filled polyethylene and epoxy composites were prepared using hot blending and mechanical mixing, respectively. 40 vol % ceramic loaded polyethylene has relative permittivity of 12.1 and loss tangent of 0.004 at 8 GHz, whereas the corresponding composite using epoxy as matrix has permittivity and loss tangent of 14.1 and 0.022, respectively. The effective medium theory fits relatively well for the observed permittivity of these composites.
Development of a low-temperature sintered dielectric material derived from Li 2 MgSiO 4 (LMS) for low-temperature cofired ceramic (LTCC) application is discussed in this paper. The LMS ceramics were prepared by the solid-state ceramic route. The calcination and sintering temperatures of LMS were optimized at 8501C/4 h and 12501C/2 h, respectively, for the best density and dielectric properties. The crystal structure and microstructure of the ceramic were studied by the X-ray diffraction and scanning electron microscopic methods. The microwave dielectric properties of the ceramic were measured by the cavity perturbation method. The LMS sintered at 12501C/2 h had e r 5 5.1 and tan d 5 5.2 Â 10 À4 at 8 GHz. The sintering temperature of LMS is lowered from 12501C/2 h to 8501C/2 h by the addition of both lithium borosilicate (LBS) and lithium magnesium zinc borosilicate (LMZBS) glasses. LMS mixed with 1 wt% LBS sintered at 9251C/2 h had e r 5 5.5 and tan d 5 7 Â 10 À5 at 8 GHz. Two weight percent LMZBS mixed with LMS sintered at 8751C/2 h had e r 5 5.9 and tan d 5 6.7 Â 10 À5 at 8 GHz.
integrated with other RF frond-end circuits. Computer simulations and measurements have indicated that it can effectively cover WLAN operation bandwidth with circular polarization and the gain of the proposed antenna can meet the requirements of indoor wireless applications.
ACKNOWLEDGMENTS
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