Inter digital filter calculator.

When high quality, low insertion loss in the passband and narrowband filtering is required an interdigital filter is a good solution. The filter is built up from a series of tunable resonators and these type of filters are primarily suitable for frequencies in the VHF/UHF and SHF ranges.

The tuning is accomplished by tuning screws. Care must be taken when this type of filter carries more than one signal as the tuning screws can be the source of unwanted Passive Intermodulation (PIM) products.

The program supplies a complete dataset of the mechanics of the filter.