Filter unit, antenna filter unit and radio unit

Patent metadata

Field	Value
Publication number	US-2023361442-A1
Application number	US-202018028715-A
Country	US
Kind code	A1
Filing date	Sep 29, 2020
Priority date	Sep 29, 2020
Publication date	Nov 9, 2023
Grant date	—

Abstract

The present disclosure relates to a filter unit, including: a cavity filter including a hollow main body, with an inner-side surface of the main body defining a closed cavity for housing resonance elements, the main body is formed by joining a filter chassis part and a filter cover part covering the filter chassis part, wherein an outer-side surface of the filter chassis part or the filter cover part facing a radio board that is to be electrically coupled with the cavity filter is metalized in such a manner that a metal layer formed thereby is configured as an electromagnetic compatibility (EMC) cover for blocking the radio board from electromagnetic interference. Also, the present disclosure relates to an antenna filter unit including the above-said filter unit and a radio unit including the above-said filter unit or the antenna filter unit.

First claim

1 . A filter unit, comprising:
a cavity filter comprising a hollow main body, with an inner-side surface of the main body defining a closed cavity for housing resonance elements, the main body is formed by joining a filter chassis part and a filter cover part covering the filter chassis part, wherein an outer-side surface of the filter chassis part or the filter cover part facing a radio board that is to be electrically coupled with the cavity filter is metalized in such a manner that a metal layer formed thereby is configured as an electromagnetic compatibility (EMC) cover for blocking the radio board from electromagnetic interference, wherein the metal layer is metalized by plating on a base portion made of plastic.

2 . The filter unit according to claim 1 , wherein the EMC cover is formed on the filter chassis part.

3 . The filter unit according to claim 2 , wherein the filter chassis part comprises the base portion made of plastic on which the metal layer is plated, and the EMC cover is shaped by integrally molding.

4 . The filter unit according to claim 1 , wherein the EMC cover is formed on the filter cover part.

5 . The filter unit according to claim 4 , wherein the filter cover part comprises the base portion made of plastic on which the metal layer is plated, and the EMC cover is shaped by integrally molding.

6 . The filter unit according to claim 3 , wherein a connecting structure for the coupling between the radio board and the cavity filter is provided, comprising a protrusion integrally formed with the base portion on which the EMC cover is to be integrally formed and protruding towards the radio board, wherein the protrusion comprises a hole which is provided for coaxially holding a pin towards the radio board, or an inner side of the hole is metalized without the need of inserting a pin therethrough.

7 . The filter unit according to claim 2 , wherein the filter chassis part comprises a base portion made of plastic, and an antenna port is integrally formed during molding of the base portion of the filter chassis part.

8 . An antenna filter unit, comprising a filter unit according to claim 1 and an antenna unit electrically coupled with the filter unit, wherein the antenna unit comprises radiators and a feeding network that are integrally formed on an outer-side surface of one of the filter chassis part and the filter cover part, and a reflector integrally formed on an inner-side surface of the one of the filter chassis part and the filter cover part, wherein the EMC cover is integrally formed on an outer-side surface of the other one of the filter chassis part and the filter cover part.

9 . The antenna filter unit according to claim 8 , wherein the feeding network and the radiators are integrally formed on the outer-side surface of the filter cover part.

10 . The antenna filter unit according to claim 9 , wherein the filter cover part comprises a base portion made of plastic, and the radiators are formed on an outer side of the base portion of the filter cover part facing away from the filter chassis part, by integrally molding radiator structures on the base portion of the filter cover part and applying a plastic plating method to surfaces of the radiator structures molded, and the feeding network is integrally formed by a plastic plating method on the outer side of the base portion of the filter cover part.

11 . The antenna filter unit according to claim 10 , wherein the reflector is integrally formed by a plastic plating method on an inner side of the base portion of the filter cover part facing the filter chassis part.

12 . The antenna filter unit according to claim 8 , wherein the feeding network and the radiators are integrally formed on the outer-side surface of the filter chassis part.

13 . The antenna filter unit according to claim 12 , wherein the filter chassis part comprises a base portion made of plastic, and the radiators are formed on an outer side of the base portion of the filter chassis part facing away from the filter cover part, by integrally molding radiator structures on the base portion of the filter chassis part and applying a plastic plating method to surfaces of the radiator structures molded, and the feeding network is integrally formed by a plastic plating method on the outer side of the base portion of the filter chassis part.

14 . The antenna filter unit according to claim 13 , wherein the reflector is integrally formed by a plastic plating method on an inner side of the base portion of the filter chassis part facing the filter cover part.

15 . The antenna filter unit according to claim 10 , wherein an isolation bar for reducing mutual coupling effect between radiators is formed by integrally molding a bar structure during molding of the base portion of the filter cover part or the filter chassis part and applying a plastic plating method to a surface of the bar structure molded.

16 . The antenna filter unit according to claim 8 , wherein a pin or a coupling structure is provided in the antenna filter unit for signal transition or connection between the antenna unit and the filter unit.

17 . A radio unit, comprising a radio board and a filter unit according to claim 1 .

18 . The filter unit according to claim 5 , wherein a connecting structure for the coupling between the radio board and the cavity filter is provided, comprising a protrusion integrally formed with the base portion on which the EMC cover is to be integrally formed and protruding towards the radio board, wherein the protrusion comprises a hole which is provided for coaxially holding a pin towards the radio board, or an inner side of the hole is metalized without the need of inserting a pin therethrough.

19 . The antenna filter unit according to claim 13 , wherein an isolation bar for reducing mutual coupling effect between radiators is formed by integrally molding a bar structure during molding of the base portion of the filter cover part or the filter chassis part and applying a plastic plating method to a surface of the bar structure molded.

20 . An antenna filter unit according to claim 8 , wherein the filter unit or the antenna filter unit is electrically coupled to the radio board.

Assignees

• Ericsson Telefon Ab L M

Inventors

• Pu Jin
• Li Junming
• Zhang Xueyuan

Classifications

• H01P1/208 Primary

  Cascaded cavities; Cascaded resonators inside a hollow waveguide structure (H01P1/205 takes precedence) · CPC title

• H01P3/12

  Hollow waveguides (H01P3/20 takes precedence) · CPC title

• H05K9/0026

  integrally formed from metal sheet · CPC title

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title

• H04B1/00

  Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission · CPC title