Dielectric filter

Patent metadata

Field	Value
Publication number	US-11145945-B2
Application number	US-202016800707-A
Country	US
Kind code	B2
Filing date	Feb 25, 2020
Priority date	Sep 25, 2019
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A dielectric filter includes a plurality of resonators, wherein each resonator included in the plurality of resonators includes a tuning hole; and at least one stepped hole for adjusting capacitive coupling, wherein the at least one stepped hole is disposed between two adjacent resonators included in the plurality of the resonators, wherein the stepped hole comprises a large hole and a small through hole at a bottom center of the large hole, wherein a first sidewall and a first annular bottom of the large hole are configured with a metal conductive layer, and wherein at least one of a second sidewall of the small through hole and a second annular portion outside a bottom of the small through hole is not covered with the conductive layer.

First claim

What is claimed is:

1. A dielectric filter, comprising:
a plurality of resonators, wherein each resonator included in the plurality of resonators comprises a tuning hole; and
at least one stepped hole for adjusting capacitive coupling, wherein the at least one stepped hole is disposed between two adjacent resonators included in the plurality of the resonators,
wherein the stepped hole comprises a large hole and a small through hole at a bottom center of the large hole,
wherein a first sidewall and a first annular bottom of the large hole are configured with a metal conductive layer, and
wherein at least one of a second sidewall of the small through hole and a second annular portion of the large hole beyond a perimeter of the small through hole is not covered with the conductive layer.

2. The dielectric filter of claim 1 , wherein capacitive coupling between a first resonator on a first side of the stepped hole and a second resonator on a second side opposite to the first side of the stepped hole is adjusted by reducing an amount of capacitive coupling between the first resonator and the second resonator by reducing an area of the metal conductive layer on the first sidewall of the large hole of at least one stepped hole.

3. The dielectric filter of claim 1 , wherein capacitive coupling between a first resonator on a first side of the stepped hole and a second resonator on a second side opposite to the first side of the stepped hole is adjusted by increasing an amount of capacitive coupling between the first resonator and the second resonator by reducing an area of the metal conductive layer at the bottom of the large hole of at least one stepped hole.

4. The dielectric filter of claim 1 , wherein capacitive coupling between a first resonator on a first side of the stepped hole and a second resonator on a second side opposite to the first side of the stepped hole is adjusted by increasing an amount of capacitive coupling between the first resonator and the second resonator by increasing a diameter of the second annular portion, in a case when the second annular portion of the large hole beyond the perimeter of the small through hole of at least one stepped hole is not covered with the conductive layer.

5. The dielectric filter of claim 1 , wherein a depth of the large hole is greater than a depth of the tuning hole included in each resonator, or
a depth of the small through hole is less than the depth of the large hole.

6. The dielectric filter of claim 1 , wherein a diameter of the large hole is approximately equal to a diameter of the tuning hole included in each resonator, or
a diameter of the small through hole is less than one-half of the diameter of the large hole.

7. The dielectric filter of claim 1 , wherein the stepped hole located between two adjacent resonators forms a resonant cavity.

8. The dielectric filter of claim 1 , wherein each tuning hole comprised in each resonator is a blind hole in a vertical direction and has an opening on an upper surface of each resonator, and
wherein the at least one stepped hole is located between two adjacent tuning holes included in the plurality of the resonators, the at least one stepped hole is a through hole in the vertical direction, and the large hole of the at least one stepped hole has at least one opening on at least one upper surface of at least one resonator included in the plurality of resonators.

9. The dielectric filter of claim 8 , wherein a shielding layer is configured on the at least one upper surface of at least one resonator included in the plurality of resonators, and
wherein the shielding layer covers the at least one opening of the large hole on the at least one upper surface of the at least one resonator included in the plurality of resonators, and covers each opening of each tuning hole on the upper surface of each resonator.

10. The dielectric filter of claim 1 , wherein the plurality of resonators comprises a first resonator, a tail resonator, and at least one series resonator connected in series between the first resonator and the tail resonator,
wherein a first stepped hole of the at least one stepped hole is provided between the first resonator and the adjacent resonator, and
wherein a second stepped hole of the at least one stepped hole is provided between the tail resonator and the adjacent resonator.

11. The dielectric filter of claim 10 , wherein six resonators included in the plurality of resonators are connected in series between the first resonator and the tail resonator.

12. The dielectric filter of claim 11 , wherein the first resonator and the at least one series resonator are negatively coupled.

13. The dielectric filter of claim 11 , wherein the tail resonator and the at least one series resonator are positively coupled.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Su Rongbiao
• Chen Zhou
• Wang Ruoming

Classifications

• H01P1/2002 Primary

  Dielectric waveguide filters (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence) · CPC title

• H01P1/2056

  Comb filters or interdigital filters with metallised resonator holes in a dielectric block · CPC title

• H01P7/10

  Dielectric resonators · CPC title