Integrated low-pass and band-pass filter unit formed by sheet metal coated with dielectric material

Patent metadata

Field	Value
Publication number	US-12463313-B2
Application number	US-202218692276-A
Country	US
Kind code	B2
Filing date	Apr 26, 2022
Priority date	Sep 14, 2021
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

An integrated low-pass and band-pass filter unit comprises an inner cavity formed by a shell of conductive materials; one or more low-pass resonators and two or more band-pass resonators comprised in the inner cavity. The low-pass and band-pass resonators are integrally formed by electroplated sheet metal material, and a part of each of the low-pass and band-pass resonators is coated with dielectric material. The two or more band-pass resonators are arranged at two sides of the inner cavity such that at least two resonators are aligned to face each other. The integrated low-pass and band-pass filter unit further comprises a first separator of electroplated sheet metal arranged in the inner cavity between the low-pass resonators and band-pass resonators and a second separator of electroplated sheet metal arranged in the inner cavity between the band-pass resonators at the two sides of the inner cavity.

First claim

The invention claimed is:

1 . An integrated low-pass and band-pass filter unit comprising:
an inner cavity formed by a shell of conductive materials; one or more low-pass resonators and two or more band-pass resonators comprised in the inner cavity, wherein the low-pass and band-pass resonators are integrally formed by electroplated sheet metal material, and a part of each of the low-pass and band-pass resonators is coated with dielectric material, and wherein the two or more band-pass resonators are arranged at two sides of the inner cavity such that at least two resonators are aligned to face each other; a first separator of electroplated sheet metal arranged in the inner cavity between the low-pass resonators and band-pass resonators; a second separator of electroplated sheet metal arranged in the inner cavity between the band-pass resonators at the two sides of the inner cavity; an input port to receive a signal to be filtered; and an output port to output a filtered signal.

2 . The integrated low-pass and band-pass filter unit-according to claim 1 , wherein the dielectric material is plastic, other polymer materials, or ceramic.

3 . The integrated low-pass and band-pass filter unit-according to claim 1 , wherein the integrated low-pass and band-pass filter unit further comprises a first coupling structure of the dielectric material, and wherein the first coupling structure is arranged between the two resonators facing each other, the first coupling structure is connected to the dielectric material coated part of the one resonator or to the dielectric material coated parts of both resonators.

4 . The integrated low-pass and band-pass filter unit according to claim 3 , wherein the first coupling structure of the dielectric material is placed at a top of the two resonators facing each other, such that a negative coupling between the two resonators is achieved as a result of directions of electric fields generated by the two resonators being opposite.

5 . The integrated low-pass and band-pass filter unit according to claim 4 , wherein the integrated low-pass and band-pass filter unit further comprises a second coupling structure, wherein the second coupling structure is placed at a bottom of two resonators such that a positive coupling between the two resonators is achieved as a result of directions of electric fields generated by the two resonators being the same.

6 . The integrated low-pass and band-pass filter unit according to claim 2 , wherein the integrated low-pass and band-pass filter unit further comprises a first coupling structure of the dielectric material, and wherein the first coupling structure is arranged between the two resonators facing each other, the first coupling structure is connected to the dielectric material coated part of the one resonator or to the dielectric material coated parts of both resonators.

7 . An antenna unit comprising:
one or more integrated low-pass and band-pass filter units, wherein each of the one or more integrated low-pass and band-pass filter units comprises:
an inner cavity formed by a shell of conductive materials;
one or more low-pass resonators and two or more band-pass resonators comprised in the inner cavity, wherein the low-pass and band-pass resonators are integrally formed by electroplated sheet metal material, and a part of each of the low-pass and band-pass resonators is coated with dielectric material, and wherein the two or more band-pass resonators are arranged at two sides of the inner cavity such that at least two resonators are aligned to face each other;
a first separator of electroplated sheet metal arranged in the inner cavity between the low-pass resonators and band-pass resonators;
a second separator of electroplated sheet metal arranged in the inner cavity between the band-pass resonators at the two sides of the inner cavity;
an input port to receive a signal to be filtered; and
an output port to output a filtered signal.

8 . The antenna unit according to claim 7 , wherein for each of the one or more integrated low-pass and band-pass filter units, the dielectric material is plastic, other polymer materials, or ceramic.

9 . The antenna unit according to claim 7 , wherein for each of the one or more integrated low-pass and band-pass filter units further comprises a first coupling structure of the dielectric material, and wherein the first coupling structure is arranged between the two resonators facing each other, the first coupling structure is connected to the dielectric material coated part of the one resonator or to the dielectric material coated parts of both resonators.

10 . The antenna unit according to claim 9 , wherein for each of the one or more integrated low-pass and band-pass filter units, the first coupling structure of the dielectric material is placed at a top of the two resonators facing each other, such that a negative coupling between the two resonators is achieved as a result of directions of electric fields generated by the two resonators being opposite.

11 . The antenna unit according to claim 10 , wherein for each of the one or more integrated low-pass and band-pass filter units, the integrated low-pass and band-pass filter unit further comprises a second coupling structure, wherein the second coupling structure is placed at a bottom of two resonators such that a positive coupling between the two resonators is achieved as a result of directions of electric fields generated by the two resonators being the same.

12 . The antenna unit according to claim 8 , wherein for each of the one or more integrated low-pass and band-pass filter units further comprises a first coupling structure of the dielectric material, and wherein the first coupling structure is arranged between the two resonators facing each other, the first coupling structure is connected to the dielectric material coated part of the one resonator or to the dielectric material coated parts of both resonators.

13 . A radio unit comprising:
one or more integrated low-pass and band-pass filter units, wherein each of the one or more integrated low-pass and band-pass filter units comprises:
an inner cavity formed by a shell of conductive materials;
one or more low-pass resonators and two or more band-pass resonators comprised in the inner cavity, wherein the low-pass and band-pass resonators are integrally formed by electroplated sheet metal material, and a part of each of the low-pass and band-pass resonators is coated with dielectric material, and wherein the two or more band-pass resonators are arranged at two sides of the inner cavity such that at least two resonators are aligned to face each other;
a first separator of electroplated sheet metal arranged in the inner cavity between the low-pass resonators and band-pass resonators;
a second separator of electroplated sheet metal arranged in the inner cavity between the band-pass resonators at the two sides of the inner cavity;
an input port to receive a signal to be filtered; and
an output port to output a filtered signal.

14 . The radio unit according to claim 13 , wherein for each of the one or more integrated low-pass and band-pass filter units, the dielectric material is plastic, other polymer materials, or ceramic.

15 . The radio unit according to claim 13 , wherein for each of the one or more integrated low-pass and band-pass filter units further comprises a first coupling structure of the dielectric material, and wherein the first coupling structure is arranged between the two resonators facing each other, the first coupling structure is connected to the dielectric materi

Assignees

• Ericsson Telefon Ab L M

Inventors

• Fu Jun
• Wang Weidong
• Zhang Xueyuan

Classifications

• H01P7/06

  Cavity resonators · CPC title

• H03H9/54

  comprising resonators of piezoelectric or electrostrictive material (comprising resonators using surface acoustic waves H03H9/64) · CPC title

• H01Q23/00

  Antennas with active circuits or circuit elements integrated within them or attached to them · CPC title

• H01P1/2084 Primary

  with dielectric resonators · CPC title