Multiple resonator component-mountable filter

• US 4,716,391 A
• Filed: 07/25/1986
• Issued: 12/29/1987
• Est. Priority Date: 07/25/1986
• Status: Expired due to Term

• Current Assignee: CTS Corporation
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Sokola, Raymond L., Gordon, Phillip J., Moutrie, Michael F.
• Primary Examiner(s): Nussbaum, Marvin L.
• Application Number:
  US06/890,682
• Time in Patent Office: 522 Days
• Field of Search: 333/202-212, 333/219, 333/222-224, 333/227, 333/235, 333/245, 333/246
• US Class Current: 333/206
• CPC Class Codes: H01P 1/2056 Comb filters or interdigital filters with metallised resonator holes in a dielectric block

Abstract

A dielectric block filter which may be mounted on a printed circuit board or other substrate as a single component is disclosed. The dielectric filter utilizes metalized hole resonators having coupling characteristics determined by the metalization pattern on one surface of the dielectric block. Input and output coupling is accomplished via terminals asymmetrically arranged in a mounting bracket. Mounting tabs on the bracket opposite a recessed area holding the dielectric block secure the filter to the circuit board and provide ground connection for the filter.

Claims

1. A substrate mountable filter comprising:

(a) a dielectric filter means comprised of a dielectric material and having first, second, and side surfaces, said second and side surfaces of said dielectric material being substantially covered with a conductive material;

a plurality of holes having surfaces substantially covered by a conductive material which extends from the first surface of the dielectric material toward the second surface thereof and which has openings on the first surface of the dielectric material that are disposed at predetermined distances relative to one another;

first and second electrode means disposed on said first surface and each coupled to said conductive material covered surface of a separate one of said plurality of holes; and

first and second coupling means disposed on said first surface and coupled respectively to said first and second electrode means and the respective conductive hole surface coupled thereto; and

(b) a mounting means comprised of a conductive material having a recessed area for accepting and holding said dielectric filter means and an interior surface within said recessed area disposed essentially parallel to said first surface of said dielectric material;

first and second terminal means extending through said interior surface, disposed opposite said first and second coupling means, and providing electrical contact respectively thereto; and

a plurality of mounting tabs disposed at predetermined positions opposite said recessed area whereby said dielectric filter means and mounting means may be mounted on a substrate.

2. A substrate mountable filter in accordance with claim 1 wherein said mounting tabs are disposed at predetermined asymmetrical position opposite said recessed area.

3. A substrate mountable filter in accordance with claim 1 wherein said plurality of holes are substantially parallel and aligned with one another.

4. A substrate mountable filter in accordance with claim 3 wherein said first and second terminal means are nonaligned with said plurality of holes.

5. A substrate mountable filter in accordance with claim 1 further comprising at least one strip electrode means coupled to and extending from said conductive material on the side surfaces of said dielectric material at least partially between two of said plurality of holes for adjusting the capacitive coupling therebetween.

6. A substrate mountable multi-passband filter for coupling radio frequency signals between at least two utilization means and an antenna comprising:

(a) a first dielectric filter means comprised of a dielectric material and having first, second and side surfaces, said second and side surfaces of said dielectric material being substantially covered with a conductive material;

a plurality of holes having surfaces substantially covered by a conductive material which extends from the first surface of the dielectric material toward the second surface thereof and which has openings on the first surface of the dielectric material that are disposed at predetermined distances relative to one another;

first and second electrode means disposed on said first surface and each coupled to said conductive material covered surface of a separate one of said plurality of holes; and

first and second coupling means disposed on said first surface and coupled respectively to said first and second electrode means and the respective conductive hole surface coupled thereto;

(b) a second dielectric filter means comprised of a dielectric material and having first, second, and side surfaces, said second and side surfaces of said dielectric material being substantially covered with a conductive material;

a plurality of holes having surfaces substantially covered by a conductive material which extends from the first surface of the dielectric material of said second dielectric filter toward the second surface thereof and which has openings on the first surface of the dielectric material that are disposed at predetermined distances relative to one another;

first and second electrode means disposed on said first surface of said second dielectric filter dielectric material and each coupled to said conductive material covered surface of a separate one of said plurality of holes; and

first and second coupling means disposed on said first surface of said second dielectric filter dielectric material and coupled respectively to said first and second electrode means and the respective conductive hole surface coupled thereto;

(c) at least one mounting means comprised of a conductive material having a recessed area for accepting and holding at least one said dielectric filter means and an interior surface within said recessesd area disposed essentially parallel to said first surface of said dielectric material;

first and second terminal means extending through said interior surface, disposed opposite said first and second coupling means of said at least one filter, and providing electrical contact respectively thereto; and

a plurality of mounting tabs disposed at predetermined positions opposite said recessed area whereby said at least one filter and mounting means may be mounted on a substrate; and

(d) transmission line means disposed on said substrate and coupled between said second terminal means of said mounting means and the antenna.

7. A substrate mountable multi-passband filter in accordance with claim 6 wherein said mounting tabs are disposed at predetermined asymmetrical position opposite said recessed area.

8. A substrate mountable multi-passband filter in accordance with claim 6 wherein said plurality of holes are substantially parallel and aligned with one another.

9. A substrate mountable multi-passband filter in accordance with claim 8 wherein said first and second terminal means are nonaligned with said plurality of holes.

10. A substrate mountable multi-passband filter in accordance with claim 6 further comprising at least one strip electrode means coupled to and extending from said conductive material on the side surfaces of said dielectric means at least partially between two of said plurality of holes for adjusting the capacitive coupling therebetween.

11. A substrate mountable filter comprising:

(a) a dielectric filter means comprised of a dielectric material and having first, second and side surfaces, said second and side surfaces of said dielectric material being substantially covered with a conductive material;

at least first, second, and third holes having surfaces substantially covered by a conductive material, extending from the first surface of the dielectric material toward the second surface thereof and having openings on the first surface of the dielectric material that are disposed at predetermined distances relative to one another and substantially aligned with one another;

first and second coupling means coupled to said first and third holes, respectively;

first and second capacitive means each including electrode means coupled to and surrounding openings of said first and second holes, respectively, for capacitively coupling said first and second holes to inter alia the conductive material on said side surfaces of said dielectric material; and

at least one strip electrode means coupled to and extending from said conductive material on the side surfaces of said dielectric material at least partially between two of said holes for adjusting the capacitive coupling therebetween;

(b) a mounting means comprised of a conductive material having a recessed area for accepting and holding said dielectric filter means, first and second terminal means disposed opposite said first and second coupling means and providing electrical contact respectively thereto, and a plurality of mounting tabs disposed at predetermined positions opposite said recessed area whereby said dielectric filter means and mounting means may be mounted on a substrate.

12. A substrate mountable multi-passband filter for coupling a radio-frequency (RF) signal from a RF transmitter utilization means to an antenna and coupling another RF signal from the antenna to an RF receiver utilization means, comprising:

(a) a first filter comprising;

dielectric means comprised of a dielectric material and having first, second, and side surfaces, said second and side surfaces of said dielectric means being substantially covered with a conductive material;

at least first, second, and third holes having surfaces substantially covered with a conductive material, extending from the first surface of the dielectric means toward the second surface thereof and having openings on the first surface of the dielectric means that are disposed at predetermined distances relative to one another and substantially aligned with one another;

first and second coupling means coupled to said first and third holes, respectively, said first coupling means further being coupled to a first utilization means;

first and second capacitive means each including electrode means coupled to and surrounding the openings of first and second holes, respectively, for capacitively coupling said first hole to said second hole and capacitively coupling said holes to the conductive coating on said side surfaces of said dielectric means;

third capacitive means including electrode means coupled to and surrounding the opening of said third hole at least to the conductive coating on said side surfaces of said dielectric means; and

at least one strip electrode means coupled to and extending from said conductive coating on the side surfaces of said dielectric means at least partially between two of said holes for adjusting the capacitive coupling therebetween;

(b) a second filter comprising;

dielectric means comprised of a dielectric material and having first, second, and side surfaces, said second and side surfaces of said dielectric means being substantially covered with a conductive material;

at least first, second, and third holes having surfaces substantially covered by a conductive material, extending from the first surface of the dielectric means toward the second surface thereof and having openings on the first surface of the dielectric means that are disposed at predetermined distances relative to one another and substantially aligned with one another;

first and second coupling means coupled to said first and third holes, respectively, said first coupling means further being coupled to a second utilization means;

first and second capacitive means each including electrode means coupled to and surrounding the openings of first and second holes, respectively, for capacitively coupling said first hole to said second hole and capacitively coupling said holes to the conductive coating on the side surfaces of said dielectric means; and

third capacitive means including electrode means coupled to and surrounding the opening of the third hole for capacitively coupling said third hole at least to the conductive coating on said side surfaces of said dielectric means;

(c) at least one mounting means comprised of a conductive material having a recessed area for accepting and holding at least one said filter, first and second terminal means disposed opposite said first and second coupling means of said at least one filter and providing electrical contact respectively thereto, and a plurality of mounting tabs disposed at predetermined positions opposite said recessed area whereby said at least one filter and mounting means may be mounted on a substrate; and

(d) transmission line means disposed on said substrate and coupled between said second terminal means of said mounting means and the antenna.