Patent ID: 7541893

Claim:
A signal filter suitable for use in a mobile communication device, the filter comprising: a core of dielectric material having a top, a bottom and four side surfaces having vertical edges; a plurality of through-holes extending from the top to the bottom surface, each through-hole defining a resonator; a first contiguous unmetallized area located on the top surface and extending to one of the side surfaces; a second contiguous unmetallized area located on the bottom surface and extending to one of the side surfaces; a first metallized area located on the bottom surface, the side surfaces and on the inner surfaces of the through-holes; a transmitter electrode and a receiver electrode, located on the top surface and extending to one of the side surfaces; an antenna electrode located on the bottom surface and extending to one of the side surfaces; a first set of metallized resonator pads adjacent a portion of the through-holes on the top surface, the first set of resonator pads being connected to the first metallized area; a second resonator pad surrounding one of the through-holes on the bottom surface, the second resonator pad extending into the antenna electrode; and a metallized serpentine region on the bottom surface, the metallized serpentine region extending into the second resonator pad.