梳状腔滤波器温漂问题研究

Study on Temperature Drift of Combline Filters

文章从腔体尺寸角度出发,认为某一方向的尺寸随温度是线形变化的。推导出了腔体各个部件的温漂影响因子,该因子反映了腔体的某个部件对整个腔体的温漂影响的大小。通过进一步的推导,引出了腔体温漂影响因子。依据腔体的温漂影响因子,对腔体的各个部件选择合适的材料,使腔体温漂得到补偿,并提出了腔体等效温度系数的概念。利用补偿后的腔体设计出了温度稳定的滤波器,并对影响滤波器温漂特性的关键因素进行了分析。

This paper researches on the cavity size, viewing that the change of the size at some direction is linear with temperature varies. Propose the concept of temperature drift factor of the cavity＇s component, which refleets the size of each component that contributes to the whole cavity＇s temperature drift when the components of the cavity are composed by the same material. By combining the temperature drift factor of the cavity＇s components with the actual cavity structure, the concept of temperature drift factor of the cavity is introduced. Through farther deducing, the concept of temperature drift factor of the cavity and the equivalent coefficient of the thermal expansion of a cavity are proposed. According to the temperature drift factor of the cavity, the high - temperature stability cavity filters is designed and the key factor of the filter＇s temperature drift characteristic was analyzed