DC PI CIRCUIT

Many different kinds of filtering solutions are proposed such as C, L, Pi or T cells. Linked to the targeted performance, 14 specifications have been designed from diameter 30 to 100. Many variants are available to configure the internal components, the case plating (Gold, Steel), the threading, the sealing and the terminations.

These products are created to be mounted on a PCB. They are clearly based on the same design than the tubular feedthrough filters with a shielded package. 4 specifications are proposed for Space applications (C, L, Pi or T cells with diameter 35 mm).

Exxelia added value is to reach any customer requirements owing to their mechanical division so that multiways feedthrough filters can be implemented to optimize installation and housing.

Exxelia manufactures miniature EMI filters based on ceramic capacitors and sometimes ferrite inductors in order to prevent disturbances generated by an appliance or to protect sensitive devices against those interferences.
Exxelia technologies’s filters are well known for their high reliability, robustness and electrical performances.
Moreover, they reach the ESCC requir ments and have been referenced in ESA EPPL for many years.

The function of an antiparasitic filter is to reduce the disturbance level to an admissible value to comply with the different standards or to reduce the sensitivity of an appliance within a given frequency range. For certain applications (HEMP - Lightning) protection against overvoltage is integrated into or added to the filter.

Antiparasitic filters are of the mismatched “Low-pass” type, except for special applications in telephone networks or in data transmission where they can be matched with impedance values of 50, 75, 100,120 or 600 Ohms in their band pass-range.

These filters operate by impedance mismatch in the frequency in which they are to provide their efficiency called “insertion loss”.

When selecting the structure of a filter, it is necessary to take into account the source and load impedance values, within the frequency range for which the disturbance level is to be reduced.