Ca-B-Si掺杂对Ba(Mg_(l/3)Nb_(2/3))O_3陶瓷介电性能的影响

采用传统电子陶瓷工艺合成了Ca-B-Si(CBS)玻璃掺杂的Ba(Mgl/3Nb2/3)O3微波介质陶瓷,研究了CBS掺杂量对陶瓷微波介电性能的影响。结果表明:CBS掺杂可促进陶瓷烧结并提高B位1:2有序度,进而降低微波介质损耗。当w(CBS)=3%时,陶瓷烧结温度由纯相时的1 500℃以上降至1 250℃,表观密度提高到6.32 g/cm3以上,陶瓷的微波介电性能达到最佳值:εr=26,Q.f=67 800 GHz(8 GHz),τf=25×10–6/℃。该陶瓷有望成为用于高频段微波器件的材料。

RESEARCH ON CYLINDRICAL BOX TYPE WINDOWS USED TO TRANSMIT HIGH POWER CW

The formula for calculating the threshold of average transmitting power of cylindrical TE11 mode window is revised by accurate deduction and a practical method for calculating the temperature increment of the dielectric disk in cylindrical box type window is given. Meanwhile,a typical cylindrical box type window is calculated and used as an example to discuss the power capacity, the special harmfulness and elimination of ghost mode resonance when the window is used to transmit high power Continuous Wave(CW).