Patent ID: 7714680
Filing Date: 2010-05-11
Classification: H01P

Abstract:
1. A ceramic monoblock filter, comprising: a block of dielectric material defined by top, bottom, and side surfaces wherein said side and bottom surfaces are substantially covered with a conductive material; at least first, second, third and fourth spaced-apart resonators defined by at least four adjacent resonator through-holes extending between the top and bottom surfaces of said block and surrounded on the top surface by conductive material defining conductive resonator plates; at least first and second pads of conductive material defined on the top surface, the first pad being located adjacent said conductive resonator plate of said first resonator and the second pad being located adjacent said conductive resonator plate of said fourth resonator; an external bypass transmission electrode seated on and extending on the top surface of the block between said first pad adjacent said conductive resonator plate of said first resonator and said second pad adjacent said conductive resonator plate of said fourth resonator to provide a capacitive cross-coupling directly between said first and fourth resonators; and inductive coupling means located between each of said first through fourth resonators for providing a conductive coupling between said first through fourth resonators and comprising first, second, and third elongate notches extending only into the dielectric material on said top surface of said block between said first and second, second and third, and third and fourth resonators respectively, the respective notches being covered with conductive material.