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早在1939年,R、D、Richtmeyer就发表了介质谐振器的论文,为用高介电常数、低损耗的介质材料,制成介质谐振器,代替体积庞大的金属波导谐振器,提供了理论的依据。但几十年来,由于没有找到合适的材料,国外直至1971年,国内直至1973年,还只能用温度系数不好的金红石(TiO_2)陶瓷制成集成介质谐振器。TiO_2的频率温度系数很大,达到500ppm/℃。因此,这种滤波器在X波段工作,温度系数达4MHz/℃。这在许多条件下是不能允许的。它只能在恒温或复杂的补偿条件下才能改善温度稳定性,这就失去了小型化方面的优点,在空间技术中,没有实用价值。因此,寻找一种高介电常数、低损耗、小温度系数的介质材料,几十年来一直是材料科学的目标之一。
As early as 1939, R, D, Richtmeyer published a paper on dielectric resonators, providing a theory for using dielectric resonators with high dielectric constant and low loss dielectric materials instead of bulky metal waveguide resonators The basis. However, since no suitable material was found for decades, it was only in 1971 in China and until 1973 that integrated dielectric resonators could only be made of rutile (TiO 2) ceramics with poor temperature coefficient. The frequency temperature coefficient of TiO 2 is very large, reaching 500ppm / ℃. Therefore, this filter works in the X-band with a temperature coefficient of 4MHz / ° C. This is impermissible under many conditions. It can only improve temperature stability under constant temperature or complicated compensation conditions, which loses the advantages of miniaturization and has no practical value in space technology. Therefore, finding a dielectric material with high dielectric constant, low loss and small temperature coefficient has been one of the goals of material science for decades.