Because the actual capacitive filtering model can be simply understood as a capacitance corresponding to a particular frequency band, the purpose of this application is generally to filter out interference in different frequency bands. For example, two 0.1u and one 0.01u capacitors are connected in parallel for filtering, 0.1u is responsible for the 10m frequency point, 0.01u is responsible for the 100m frequency point, and the purpose of placing two 0.1u is to place one of the 10m band interference attenuation is not enough, while placing the two to achieve the desired filtering effect.
This time the capacitor capacity value is not very meaningful, if you really want to calculate, directly add together is.