Example:
A LPSeries filter has a cutoff frequency of 1000 MHz. A stopband attenuation
of 30 dB is required at 1250 MHz.
Calculate the number
of sections as follows:
Number of 3 dB bandwidths
from cutoff frequency = The curve indicates that a minimum of 5 sections
is required.
Insertion Loss
Calculation
Knowing the number of sections, and cutoff frequency of the filter, insertion
loss may be calculated from the following formula:
Loss = N x 0.2
Example: 7LP7  1275  S
1. Number of sections = 7
2. IL = 7 x 0.2 = 1.4 dB
Note: For Lowpass
filters, insertion loss is calculated at 0.9 times the cutoff frequency
