Will an impedance matching network also act as a filter?
Will a matching impedance network also act as a filter?


A pi network, as described, is a filter and it can sometimes be used to match impedances. However, a straight impedance matcher is normally only resistive (such as for the termination of cables to prevent reflections at RF).


  I'm using a pi network and am wondering if I should also add a filter


The pi network will act like a filter and if you are not happy about its performance as a filter then add a filter but, the filter will need to match the impedances you may be seeking to maintain.