Patent ID: 8261714
Filing Date: 2012-09-11
Classification: H01P

Abstract:
1. A filter comprising: a core of dielectric material including a top surface with a surface-layer pattern of conductive areas; a plurality of through-holes extending through the core and defining a plurality of respective openings in the top surface, the surface-layer pattern of conductive areas on the top surface surrounding at least a portion of one or more of the openings in the top surface; a wall extending outwardly from and surrounding the top surface, the wall including an inner surface, an outer surface, and a top rim, the wall defining a single cavity in the filter and further defining a shield which prevents external electromagnetic fields outside of the single cavity from causing noise and interference; and at least a first conductive input/output electrode defined by a surface-layer conductive area formed on at least the inner surface and the top rim of the wall and in contact with the surface-layer pattern of conductive areas on the top surface of the core.