A HP-Series filter has a cutoff frequency of 300 MHz.
A stopband attenuation of 60 dB is required at 200 MHz. Calculate the number of sections by:
Number of 3 dB bandwidths from cutoff frequency =
The curve indicates that a minimum of 5 sections are 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
1. Number of sections = 5
2. IL = 5 x 0.2 = 1.0 dB
Note: For Highpass filters, insertion loss is calculated at 1.1 times the cutoff frequency.