A ceramic filter mountable on a multi-layer circuit board. The filter contains a two-level mounting surface for matingly engaging with a circuit board. One surface portion of the two-level mounting surface extends through a recessed area formed upon a surface of the circuit board. By mounting the filter...http://www.google.fr/patents/US5045824?utm_source=gb-gplus-shareBrevet US5045824 - Dielectric filter construction
