一种基于调谐频率设计双调谐滤波器的新方法

针对双调谐滤波器的参数设计问题,提出一种基于调谐频率设计双调谐滤波器的方法.利用双调谐滤波器与2个并联的单调谐滤波器阻抗等效的原理,研究双调谐滤波器中串联谐振支路电感、电容和单调谐滤波器谐振频率、电容的关系,从而确定双调谐滤波器串联支路和并联支路的谐振频率.利用单调谐滤波器的谐振频率是双调谐滤波器的零点,确定并联支路的电感,结合并联支路的谐振频率确定并联支路的电容.该方法可以简化双调谐滤波器的设计运算,实例展示了该方法双调谐滤波器阻抗特性曲线,仿真分析表明:依据该方法设计的双调谐滤波器的滤波效果良好.

A new method for designing double-tuned filter based on resonance frequency

To solve the problem of parameter setups of double-tuned filter, a method for designing double-tuned filter was proposed based on resonance frequency. The relationship between the inductance and capacitance of the serial resonance branch in the double-tuned filter and the resonance frequency of single tuned filter and its capacitance was studied using the principle that the impedance of double-tund filter is equivalent to the impedance of two parallel single tuned filters. The inductance of the parallel branch was calculated because resonance frequency of the single tuned filter is the zero of the double-tuned filter, then its capacitance was calculated with the parallel resonance frequency. This method simplified the operation process of the double-tuned filter, the impedance-frequency curve of double-tuned filter designed in this study was displayed in a specific case, and simulation results show that the filtering of the double-tuned filter is good.