Radio frequency filter device

Claim 1

An adapter for fitting between a pair of connectors, which is used for eliminating RF interference in at least one conductor, the connectors having electrically conductive housings surrounding said at least one conductor with the housings having male and female threads to aid in making a connection comprising: an electrically conductive adapter housing with male threads on one of its ends and with female threads on its other end for mating with the threads on said connectors; filter means having outer conductors for making electrical contact with said adapter housing for providing an RF interference shield; a rigid conductive plate with a hole therethrough for each of said filter means supporting said filter means, the size of each hole being such that the outer conductor of the filter means makes electrical contact with said plate; a shoulder around the inside of said adapter housing against which said plate abuts and makes electrical contact with said adapter housing; and insulative support material substantially surrounding said filter means on opposite sides of said plate whereby the ends of said filter means can be connected to the conductor ends to connect the adapter in the conductor circuits and with the plate forming an RF shield.