Duplex filter with recessed top pattern and cavity

摘要

A duplex filter includes a block of dielectric material with top, bottom, and side surfaces and first and second spaced-apart sets of through-holes. A pair of outside walls and a center wall extend outwardly from the top surface. A pattern of metallized areas is defined on the top surface of the block including first and second electrodes that extend on the pair of outside walls respectively and third and fourth electrode antennae that extend on the center wall. The block may be two separate blocks coupled together to form an interior layer of metallization separating the first and second sets of through-holes and the center wall separates respective transmit and receive portions of the pattern of metallized areas.

主权项

1. A filter comprising:
a core with a top surface, a bottom surface, and side surfaces, said core defining a longitudinal axis, a first plurality of through-holes extending longitudinally along the top surface of the core, a second plurality of through-holes extending longitudinally along the top surface of the core in a spaced-apart and generally parallel relationship to the first plurality of through-holes, the first and second plurality of through-holes being spaced-apart from and located on opposite sides of the longitudinal axis of the core, each of the through-holes of the first and second plurality of through-holes extending through the core from an opening defined in said top surface of said core to an opening defined in said bottom surface of said core; a center wall extending upwardly from the core in a relationship co-linear with the longitudinal axis of the core, the first and second plurality of through-holes being spaced-apart from and located on opposite sides of the center wall, the center wall defines a top rim adapted to be seated against a surface of a board; and a surface-layer pattern of metallized and unmetallized areas on said core, said pattern including first and second connection areas of metallization located on said top surface, and a third connection area of metallization located on said top surface and extending on said center wall.