An electrical connector includes an insulative housing defining a plurality of passageways with an inserted opening, a plurality of forniciform terminals inserted into the passageways from the inserted openings and disposed therein, each defining a soldering portion extending towards outside of the insulative housing and a connecting portion folding and extending from one end of soldering portion. The abrasive article is made of a foraminous substrate, at least one binder and abrasive particles. A protrusion is formed on an inner surface of the stator for supporting an outer surface of the rotor thus obtaining stable rotation of the rotor. Accordingly, a configurable frequency IF filter with the capability to operate with multiple standards is provided.