The frequency characteristic of the so-called axial film capacitor
refers to the relationship between the capacitance and other parameters of the capacitor changing with frequency. Generally speaking, the dielectric materials used in axial film capacitors are polyester and polypropylene. Here we have to talk about what is called a polar medium and a non-polar medium. The so-called polar medium means that the electronegativity (ie electron withdrawing ability) of the atoms in the molecules of the medium is different, which will make the electric properties of the atoms in the medium molecules different. If the charge centers in the medium molecules overlap, the molecules are non-polar. , That is, the medium is a non-polar medium. If the charge centers in the medium molecules do not overlap, the medium molecules are polar and the medium is a polar medium. For more details, please call the national toll-free hotline: 4006299138. The two dielectric polyester films used in axial film capacitors are polar dielectrics, while polypropylene films are non-polar dielectrics. When the frequency changes from small to large, the capacitance of an axial film capacitor using a polar medium, namely a polyester film, will gradually decrease. However, the capacitance of axial film capacitors using a non-polar medium, namely polypropylene film, has hardly changed. Therefore, relatively speaking, axial film capacitors using polypropylene film are more suitable for high-frequency circuits.
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