Abstract
The microwave dielectric Ba(Mg1/3Ta2/3)O3 ceramics with different sintering temperatures were prepared by conventional solid-state reaction synthesis method. The ordering degree and lattice distortion related to high quality factor were investigated systematically with XRD. In accordance with the observed morphology and grain distribution, compact and uniform microstructure with large grain size has a good effect on the high Q × f value. Surprisingly, in the case of the 1:2 ordered structure, the shorter bond length associated to Mg-O at 1670 ℃ also contributes to the high-Q, as compared with that of samples sintered at low temperature. Finally, Ba(Mg1/3Ta2/3)O3 ceramic based filter (center frequency: 10.29 GHz, bandwidth: 216 MHz, insertion loss: 0.86 dB) was designed for X-band high frequency application.
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