Monoblock RF resonator/filter having a conductive transmission line connecting regions of conductive material
A resonator/filter adapted for direct surface mounting to the surface of a printed circuit board. The resonator/filter comprises a block of dielectric material including at least one resonator through-hole extending therethrough and respective top, bottom and side surfaces defining respective regions of dielectric material covered with conductive material. The top block surface defines at least a first conductive region. A second conductive region on the bottom surface of the block defines an input/output contact which allows the filter to be mounted on the board with the bottom filter surface seated thereon, thus providing a direct ground contact between the board and the resonator through-hole for improved attenuation performance particularly at higher frequencies. A plurality of transmission line embodiments electrically interconnect the first and second conductive regions.
1. A dielectric monoblock filter comprising:
a block of dielectric material having at least top and bottom surfaces and side surfaces extending therebetween in a relationship generally normal to said top and bottom surfaces;
at least a first region of conductive material on the top surface of said block;
at least a second region of conductive material on the bottom surface of said block defining at least a first input/output contact;
at least one through-hole extending between the top and bottom surfaces of said block in a relationship generally normal to said top and bottom surfaces of said block; and
a transmission line between and electrically interconnecting said at least first and second regions of conductive material, said transmission line comprising a strip of conductive material extending along one of the side surfaces of said block between said at least first and second regions.
2. The filter of claim 1 wherein said block defines a front side surface and said strip of conductive material extends along said front side surface between said at least first and second regions.
3. The filter of claim 1 wherein said block defines an end side surface and said strip of conductive material extends along said end side surface between said at least first and second regions.
4. A resonator device adapted to be attached to the surface of a circuit board or substrate comprising:
a block of dielectric material defined by top, bottom, and side surfaces including a first region of conductive material on said top surface of said block of dielectric material;
a second region of conductive material on said bottom surface of said block of dielectric material defining an input/output contact for capacitively electrically coupling said resonator device to the board or substrate;
at least one resonator defined by at least one through-hole extending between the top and bottom surfaces of said block, said at least one through-hole defining and being oriented in a relationship generally normal to the surface of the circuit board when said resonator device is attached thereto; and
a conductive transmission line extending between and interconnecting said first and second regions of conductive material, said transmission line comprising a strip of conductive material extending along one of said side surfaces of said block between said first region of conductive material on said top surface and said input/output contact on said bottom surface.
5. The resonator device of claim 4 wherein said block defines an end side surface and said transmission line extends along said end side surface.
6. The resonator device of claim 4 wherein said block defines a front side surface and said transmission line extends along said front side surface of said block.
7. A dielectric monoblock filter comprising:
a block of dielectric material having at least top and bottom surfaces and side surfaces extending therebetween in a relationship generally normal to said top and bottom surfaces;
a plurality of through-holes extending through said block between said top and bottom surfaces in a relationship generally normal to said top and bottom surfaces of said block and terminating in respective apertures in said top and bottom surfaces respectively;
at least one first region of conductive material surrounding selected ones of said apertures defined in said top surface;
at least a second pair of second regions of conductive material defined on said bottom surface defining respective input/output contacts; and
at least a pair of transmission lines between and electrically interconnecting said at least one first region of conductive material and said at least a second pair of second regions of conductive material said at least a pair of transmission lines being defined by a pair of strips of conductive material extending along the exterior of said side surfaces between said top surface and said respective input/output contacts on said bottom surface.
8. The dielectric monoblock filter of claim 7 wherein said block defines a front side surface and said pair of strips of conductive material extend along the exterior of said front side surface in spaced-apart and parallel relationship.
9. The dielectric monoblock filter of claim 7 wherein said block defines a pair of opposed end side surfaces and said pair of strips of conductive material extend respectively along the exterior of said opposed end side surfaces in a diametrically opposed relationship.