CN112310586A

CN112310586A - Integrated circulator

Info

Publication number: CN112310586A
Application number: CN202011367232.2A
Authority: CN
Inventors: 朱键铭; 高真平; 王雪颖; 杨国华
Original assignee: Sichuan Zhongguang Lightning Protection Technologies Co ltd
Current assignee: Sichuan Zhongguang Lightning Protection Technologies Co ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-02-02

Abstract

The invention discloses an integrated circulator which comprises a micro-strip circuit, a rotating magnetic sheet and a permanent magnet, wherein the micro-strip circuit is directly formed by processing a conductive coating of a PCB (printed circuit board), and the rotating magnetic sheet and the permanent magnet are sequentially overlapped on an area where the micro-strip circuit is located and fixed. The integrated circulator of the invention directly forms the micro-strip circuit of the circulator by utilizing the conductive coating of the PCB, completely eliminates the problem of port impedance matching between the micro-strip circuit and the related circuit on the PCB, effectively improves the consistency of assembly precision, ensures the consistency of performance after assembly and improves the use reliability.

Description

Integrated circulator

Technical Field

The invention relates to the technical field of circulators, in particular to an integrated circulator.

Background

The circulator is a multi-port device which transmits incident waves entering any port of the circulator into the next port according to the direction sequence determined by the static bias magnetic field. The circulator is also called as an isolator, and controls the transmission of electromagnetic waves along a certain circulating direction, and the characteristic of unidirectional transmission of high-frequency signal energy is mainly used between the output end of a high-frequency power amplifier and a load, so that the circulator and the load are independent and mutually isolated. With the development of the new generation of 5G communication technology, the demand for circulators is increasing, and the circulator is being miniaturized and low-cost.

At present, a surface-mounted circulator with a line structure usually applied to a 5G system is high in manufacturing cost, and is difficult to be well matched with a microstrip line when the surface-mounted circulator is mounted on a PCB of a client, the performance consistency after the mounting is difficult to guarantee.

Disclosure of Invention

The invention aims to solve the technical problems and the technical task of improving the prior art, provides an integrated circulator and solves the problems that the circulator in the prior art is difficult to be accurately matched with a microstrip line during surface-mounted assembly and has poor assembly consistency.

In order to solve the technical problems, the technical scheme of the invention is as follows:

an integrated circulator comprises a micro-strip circuit, a rotating magnetic sheet and a permanent magnet, wherein the micro-strip circuit is directly formed by processing a conductive coating of a PCB, and the rotating magnetic sheet and the permanent magnet are sequentially overlapped and covered on an area where the micro-strip circuit is located and fixed. The integrated circulator of the invention directly processes the conductive coating of the PCB into the shape of the central conductor of the traditional circulator, and then the rotating magnetic sheet and the permanent magnet are directly fixed on the PCB, thereby realizing the integration of the circulator and the PCB. In addition, only one rotating magnetic sheet and one permanent magnet are adopted, so that the structure is simplified, the cost is low, and the processing and assembling efficiency is high.

Further, still be provided with on the PCB board and be located microstrip circuit circumference outlying table pad pasting district, the surface of whirl magnetic sheet be provided with the metal rete, the whirl magnetic sheet pass through metal rete and table pad pasting district welding in order to fix on the PCB board, the permanent magnet adhesion fix on the whirl magnetic sheet. The integrated circulator is simple in structure, convenient to assemble and high in efficiency, and the structural stability of the integrated circulator is effectively guaranteed, so that the performance stability is guaranteed.

Furthermore, a metal film layer is formed on the surface of the gyromagnetic sheet through a thick film process, so that the gyromagnetic sheet can be stably fixed on a PCB, and the structural stability of the integrated circulator is improved.

Further, still be provided with the apron, still be provided with on the PCB board and be located microstrip circuit circumference outlying table subsides district, apron and table subsides district welding fix on the PCB board in order to revolve magnetic sheet lamination, the permanent magnet adhesion need not to carry out the pre-processing to revolving magnetic sheet on the apron, convenient assembling, efficient, compact structure, occupation space are little.

Furthermore, the cover plate comprises a plate surface and a flanging arranged at the edge of the plate surface and used for being welded with the surface mounting area, and a notch is formed in a port of the microstrip circuit by the flanging.

The integrated circulator further comprises a uniform magnetic sheet which is connected to the PCB board, can optimize a magnetic circuit, can widen the working frequency of the integrated circulator and improve the electrical indexes of the insertion loss and the return loss of the integrated circulator.

Furthermore, even magnetic sheet setting in the PCB board for revolving the opposite side surface of magnetic sheet, can reach the effect of good ground connection and even magnetic field simultaneously, easily assembly, compact structure, occupation space is little.

Furthermore, the even magnetic sheet is fixed on the PCB board in a welding or bonding mode, so that the connection is stable, and the processing and the assembly are convenient.

Furthermore, even magnetic sheet embedding pre-buried inside the PCB board, the structure is compacter, firm, occupation space is little.

Furthermore, the permanent magnet is covered with a magnetic shielding cover, so that the magnetic circuit diffusion of the permanent magnet is avoided, the magnetic circuit of the permanent magnet is more densely concentrated in the circulator, and the interference of a leakage magnetic field to surrounding components is reduced.

Compared with the prior art, the invention has the advantages that:

the integrated circulator of the invention directly forms the micro-strip circuit of the circulator by utilizing the conductive coating of the PCB, completely eliminates the problem of port impedance matching between the micro-strip circuit and the related circuit on the PCB, effectively improves the consistency of assembly precision, ensures the consistency of performance after assembly and improves the use reliability.

Drawings

FIG. 1 is a schematic diagram of a first embodiment of an integrated circulator;

FIG. 2 is an exploded view of a first embodiment of the integrated circulator;

FIG. 3 is a schematic diagram of a second embodiment of the integrated circulator;

FIG. 4 is an exploded view of a second embodiment of the integrated circulator;

FIG. 5 is a schematic top view of the cover plate;

FIG. 6 is an exploded view of a third embodiment of the integrated circulator;

fig. 7 is an exploded view of a fourth embodiment of the integrated circulator.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The integrated circulator disclosed by the embodiment of the invention has the advantages of simple structure, more convenience and efficiency in assembly, effective guarantee of assembly precision, improvement of assembly consistency and guarantee of consistent and stable product performance.

As shown in fig. 1 and 2, an integrated circulator mainly comprises a microstrip circuit 1, gyromagnetic sheet 2 and permanent magnet 3, wherein the microstrip circuit 1 is directly formed by processing a conductive coating of a PCB board 4, the gyromagnetic sheet 2 and the permanent magnet 3 are sequentially stacked on an area where the microstrip circuit 1 is located and fixed, the PCB board 4 is a customer PCB board, the microstrip circuit of the circulator is formed by directly utilizing the conductive coating of the PCB board, so that a port of the microstrip circuit is directly connected with a related circuit on the PCB board, the problem of matching alignment does not exist, matching impedance is eliminated, assembly precision consistency is effectively improved, and performance consistency after assembly is guaranteed.

Specifically, the gyromagnetic sheet 2 and the permanent magnet 3 are preferably fixed in two ways, one way is that a surface mount area 5 which is located on the periphery of the circumference of the microstrip circuit 1 and is composed of a conductive coating layer is further arranged on the PCB 4, a spacing distance meeting the electrical insulation requirement is arranged between the surface mount area 5 and the microstrip circuit 1, the surface of the gyromagnetic sheet 2 is provided with a metal film layer, the gyromagnetic sheet 2 is welded with the surface mounting area 5 through the metal film layer so as to be fixed on the PCB 4, specifically, the metal film layer on the surface of the spin magnetic sheet 2 is formed by a thick film process, the metal film layer needs to meet the weldability requirement, the bad conditions of color change, peeling and bubbling can not occur after being baked at the high temperature of 300 ℃ for 5 minutes, then the permanent magnet 3 is fixed on the rotary magnetic sheet 2, and the permanent magnet 3 can be directly adhered on the rotary magnetic sheet 2 by adopting an adhesive and the like, so that the assembly is convenient and the efficiency is high.

The second mode is as shown in fig. 3 to 5, a cover plate 6 is further provided, that is, the cover plate 6 presses the gyromagnetic sheet 2 on the area where the microstrip circuit 1 is located, a surface mount area 5 located on the circumferential periphery of the microstrip circuit 1 is further provided on the PCB board 4, the cover plate 6 is welded with the surface mount area 5 to fix the gyromagnetic sheet 2 on the PCB board 4 in a laminating manner, then the permanent magnet 3 is fixed on the top surface of the cover plate 6 in an attaching manner, and the surface mount area 5 simultaneously plays a role of grounding, or the cover plate 6 is welded with the surface mount area 5 to fix the gyromagnetic sheet 2 and the permanent magnet 3 on the PCB board 4 in a laminating manner, the assembly mode is simple and efficient, the stability of assembly can be ensured, and the performance stability of the integrated circulator can be ensured, the cover plate 6 specifically comprises a plate surface attached to the gyromagnetic sheet 2 and a flange arranged on the edge of the plate surface, and the, therefore, the flanging is only attached to and contacted with the surface mounting area 5 to further realize welding, and the notch prevents the flanging from contacting with the port of the microstrip circuit 1 to influence the use reliability of the integrated circulator.

As shown in fig. 6, the third embodiment of the integrated circulator is further provided with a magnetic homogenizing sheet 7, specifically, the magnetic homogenizing sheet 7 is arranged on the other side surface of the PCB 4 opposite to the magnetic rotating sheet 2, that is, the microstrip circuit 1 is formed by processing a conductive coating on the upper surface of the PCB 4, the magnetic rotating sheet 2, the cover plate 6 and the permanent magnet 3 are sequentially stacked on the upper surface of the PCB 4 where the microstrip circuit 1 is located, the magnetic homogenizing sheet 7 is arranged on the lower surface of the PCB 4, the magnetic homogenizing sheet 7 can be fixed on the PCB 4 by welding or bonding, the assembly is convenient and stable, the magnetic homogenizing sheet can be made of iron material or other strong magnetic material, the magnetic homogenizing sheet 7 can achieve good grounding and uniform magnetic field effects when fixed on the lower surface of the PCB 4, the magnetic homogenizing sheet 7 can optimize and widen the magnetic circuit and the operating frequency, the electrical performance indexes of the insertion loss and the return loss of the integrated circulator are improved, and the performance parameters of the non-uniform magnetic sheet and the performance parameters of the integrated circulator after the uniform magnetic sheet is added are compared as shown in the table 1.

TABLE 1

	Non-uniform magnetic sheet	Increase even magnetic sheet
			Frequency of operation	3.5GHz～3.7GHz	3.4GHz～3.8GHz
Insertion loss	0.5dB	0.4dB
			Reverse isolation	20dB	21dB
Return loss	21dB	22dB

The magnetic homogenizing sheet 7 can be embedded or pre-buried in the PCB 4, a groove can be formed in the lower surface of the PCB 4 to enable the magnetic homogenizing sheet 7 to be embedded and mounted on the PCB 4, the magnetic homogenizing sheet 7 is flush with the lower surface of the PCB 4, the structural compactness is improved, the occupied space is reduced, and the magnetic homogenizing sheet 7 can be fixed in the groove formed in the lower surface of the PCB 4 in a welding or bonding mode; also can be when preparation PCB board 4 directly with whole even magnetic sheet 7 pre-buried inside PCB board 4, promptly, PCB board 4 wraps up even magnetic sheet 7 is whole inside it completely, and the structure is compacter, stable, even magnetic sheet 7 does not occupy the exterior space.

As shown in fig. 7, in the fourth embodiment of the integrated circulator, compared with the third embodiment, the permanent magnet 3 is further covered with a magnetic shielding cover 8, so as to prevent the magnetic path of the permanent magnet from diffusing, so that the magnetic path of the permanent magnet is more densely concentrated inside the circulator, and meanwhile, the interference of a leakage magnetic field to surrounding components is reduced, specifically, the magnetic shielding cover 8 includes a plate surface attached to the permanent magnet 3 and a flange arranged at the edge of the plate surface, and the flange is provided with a notch at the port of the microstrip circuit 1 to avoid the port of the microstrip circuit 1, so as to prevent the magnetic shielding cover 8 from contacting the microstrip circuit 1 and causing adverse effects on the microstrip circuit 1, and the flange of the magnetic shielding cover 8 is in contact connection with the PCB 4 to achieve fixation.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims

1. The integrated circulator is characterized by comprising a micro-strip circuit (1), gyromagnetic pieces (2) and permanent magnets (3), wherein the micro-strip circuit (1) is directly formed by processing a conductive coating of a PCB (printed circuit board) board (4), and the gyromagnetic pieces (2) and the permanent magnets (3) are sequentially stacked on an area where the micro-strip circuit (1) is located and fixed.

2. The integrated circulator as claimed in claim 1, wherein a surface mounting region (5) is further disposed on the PCB (4) at a circumferential periphery of the microstrip circuit (1), a metal film layer is disposed on a surface of the gyromagnetic sheet (2), the gyromagnetic sheet (2) is welded to the surface mounting region (5) through the metal film layer to be fixed on the PCB (4), and the permanent magnet (3) is adhered to the gyromagnetic sheet (2).

3. The integrated circulator of claim 2, wherein the surface of the gyromagnetic plate (2) is formed with a metal film layer by a thick film process.

4. The integrated circulator as claimed in claim 1, wherein a cover plate (6) is further provided, a surface mounting region (5) located at the periphery of the microstrip circuit (1) is further provided on the PCB (4), the cover plate (6) and the surface mounting region (5) are welded to fix the gyromagnetic sheet (2) on the PCB (4) in a laminating manner, and the permanent magnet (3) is adhered to the cover plate (6).

5. The integrated circulator of claim 4, wherein the cover plate (6) comprises a plate surface and a flange arranged at the edge of the plate surface for welding with the surface-mount region (5), and the flange is provided with a notch at the port of the microstrip circuit (1).

6. The integrated circulator of any one of claims 1 to 5, further comprising a magnetic homogenizing sheet (7), wherein the magnetic homogenizing sheet (7) is connected to the PCB (4).

7. The integrated circulator as claimed in claim 6, wherein the magnetic homogenizing sheet (7) is disposed on the other side surface of the PCB (4) opposite to the magnetic rotating sheet (2).

8. The integrated circulator as claimed in claim 7, wherein the magnetic homogenizing sheet (7) is fixed on the PCB (4) by welding or bonding.

9. The integrated circulator as claimed in claim 6, wherein the magnetic homogenizing sheet (7) is embedded or pre-buried inside the PCB (4).

10. The integrated circulator of any one of claims 1 to 5, wherein a magnetic shield (8) is further covered on the permanent magnet (3).