# US 10,312,563 B2 · Ceramic filter with differential conductivity

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- Number: US 10,312,563 B2
- Document ID: US10312563B2
- Status: Granted
- Kind: B2
- Application number: 15/720,277
- Filed: 2017-09-29
- Published: 2018-05-10
- Granted: 2019-06-04
- Earliest claimed: 2016-11-08
- Assignees: LGS Innovations LLC
- Applicants: Lgs Innovations LLC
- Inventors: Alan Scott Brannon; Jeffrey Jan Nummerdor, Jr.; Scott W. Burgess
- Web page: https://patentgrep.com/patent/US10312563B2

## CPC

- H01P 1/2002: {Dielectric waveguide filters (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence)}
- C30B 25/00: Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- H01P 1/2056: {Comb filters or interdigital filters with metallised resonator holes in a dielectric block}
- H01P 1/2084: {with dielectric resonators}
- H03H 7/463: {Duplexers}
- H04B 1/40: Circuits
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)
- C30B: SINGLE-CRYSTAL GROWTH (by using ultra-high pressure, e.g. for the formation of diamonds, B01J3/06); UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL (zone-refining of metals or alloys C22B); PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE (casting of metals, casting of other substances by the same processes or devices B22D; working of plastics B29; modifying the physical structure of metals or alloys C21D, C22F); SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE (for producing semiconductor devices or parts thereof H10); APPARATUS THEREFOR
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)
- H04B: TRANSMISSION

## Abstract

The present application is directed to a filter and methods of making the same. The filter includes a block of dielectric material with a top surface including a patterned region, a bottom surface, and side surfaces. The filter also includes a through-hole extending through the block from the top surface to the bottom surface. The through-hole is partially surrounded by the patterned region. The filter also includes a wall extending from the top surface, the wall having an inner surface, an outer surface, and a roof. The bottom surface, side surfaces, outer surface, and roof have a first coating of silver and glass frit. The patterned region, through-hole and inner surface have a second coating of silver and glass frit. The glass frit in the first coating is at least 0.5% greater than the glass frit in the second coating. The application is also directed to a system including a printed circuit board and a filter.

## Claims

### Claim 1

A filter comprising:
a block of dielectric material with a top surface including a patterned region, a bottom surface, and side surfaces;
a through-hole extending through the block from the top surface to the bottom surface, the through-hole being partially surrounded by the patterned region; and
a wall extending from the top surface, the wall having an inner surface, an outer surface, and a roof, wherein
the bottom surface, side surfaces, outer surface, and roof have a first coating including glass frit,
the patterned region, through-hole and inner surface have a second coating including glass frit, and
the glass frit in the first coating is at least 20% greater than the glass frit in the second coating.

### Claim 2 (depends on 1)

The filter of claim 1, wherein the glass frit in the first coating is at least 30% greater than the glass frit in the second coating.

### Claim 3 (depends on 2)

The filter of claim 2, wherein the glass frit in the first coating is at least 40% greater than the glass frit in the second coating.

### Claim 4 (depends on 1)

The filter of claim 1, wherein the wall extends along a perimeter of the top surface.

### Claim 5 (depends on 4)

The filter of claim 4, wherein the wall includes a slot extending there through from the inner surface to the outer surface.

### Claim 6 (depends on 5)

The filter of claim 5, wherein the wall includes a post formed between the slot and a second, spaced-apart slot extending from the inner surface to the outer surface.

### Claim 7 (depends on 6)

The filter of claim 6, wherein a second post and the post are located on a similar side surface of the block.

### Claim 8 (depends on 6)

The filter of claim 6, wherein the patterned region of the top surface continuously extends to the post.

### Claim 9 (depends on 1)

The filter of claim 1, wherein a cavity is defined by the top surface and the wall.

### Claim 10 (depends on 1)

A duplex filter comprising at least two filters according to claim 1.

### Claim 11

A system comprising:
a printed circuit board having a top surface and including input and output pads; and
a filter including:
a block of dielectric material with a top surface including a patterned region, a bottom surface, and side surfaces,
a through-hole extending through the block from the top surface to the bottom surface, and
a wall extending from the top surface, the wall having an inner surface, an outer surface, and a roof, the wall including a first post formed between two spaced-apart slots extending from the inner surface to the outer surface, and a second post formed between two other spaced-apart slots extending from the inner surface to the outer surface, wherein
the bottom surface, side surfaces, outer surface and roof have a first coating of silver and glass frit,
the patterned region, through-hole and inner surface have a second coating of silver and glass frit, and
the first and second coatings have different compositions.

### Claim 12 (depends on 11)

The system of claim 11, wherein the glass frit in the first coating is at least 20% greater than the glass frit in the second coating.

### Claim 13 (depends on 11)

The system of claim 11, wherein the input and output pads of the printed circuit board contact the first and second posts.

### Claim 14 (depends on 13)

The system of claim 13, wherein the roof is coupled to the top surface of the printed circuit board.

### Claim 15 (depends on 11)

The system of claim 11, wherein the through-hole is partially surrounded by the patterned region.

### Claim 16

A method of patterning a filter comprising:
providing a dielectric block filter including a top surface, a bottom surface, side surfaces, a through-hole extending through the block filter from the top surface to the bottom surface, and a wall extending from the top surface, the wall having an inner surface, an outer surface, and a roof;
masking the top surface, through-hole, and inner surface of the wall;
depositing a first coating including glass frit and silver on the side surfaces, outer surface and roof;
masking side surfaces, outer surface and roof;
depositing a second coating including glass frit and silver on the top surface, through-hole, and inner surface of the wall; and
etching the second coating deposited on the top surface such that an area entirely surrounding the through-hole includes the second coating,
wherein the glass frit in the first coating is at least 20% greater than the glass frit in the second coating.

### Claim 17 (depends on 16)

The method of claim 16, wherein
the wall includes two spaced-apart slots extending there through from the inner surface to the outer surface,
the wall includes a post formed between the two spaced-apart slots, and
the top surface includes a second area outside the area with the deposited second coating, and continuously extends to the post.

### Claim 18 (depends on 17)

The method of claim 17, further comprising:
coupling the roof to a top surface of a printed circuit board; and
coupling the post to a pad on the top surface of the printed circuit board.

### Claim 19 (depends on 16)

The method of claim 16, wherein the glass frit in the first coating is at least 30% greater than the glass frit in the second coating.

### Claim 20 (depends on 19)

The method of claim 19, wherein the glass frit in the first coating is at least 40% greater than the glass frit in the second coating.