A miniaturized surface-mount circulator

Abstract

This utility model relates to the field of surface mount circulator technology, specifically a miniaturized surface mount circulator, including a housing, a ferrite core, a permanent magnet assembly, a microstrip circuit board, and a pin assembly. The ferrite core is a flat cylindrical shape with a positioning recess on its bottom surface that is interference-fitted with the central positioning post of the housing. The permanent magnet assembly consists of fan-shaped permanent magnets distributed circumferentially around the core and positioned by a dovetail tenon structure in the fan-shaped slot of the housing. The microstrip circuit board uses a three-layer composite substrate, with the middle signal layer having a spiral trace and the pin assembly being an inverted L-shape. This utility model reduces the length and width dimensions and thickness, thereby reducing the overall volume, through a flat magnetic core, a ring permanent magnet array, a spiral microstrip line, and a compact pin layout. The spiral trace of the middle signal layer achieves a longer electrical length within a limited radius by multiple turns, making full use of the space inside the circulator and maintaining a small physical size.

Description

Technical Field

[0001] This utility model relates to a surface mount circulator, and more particularly to a miniaturized surface mount circulator, belonging to the technical field of surface mount circulators. Background Technology

[0002] Circulators, as core components for realizing unidirectional transmission of radio frequency signals, are widely used in fields such as communications and radar. However, traditional surface-mount circulators use a separate block layout for the ferrite core and permanent magnet, resulting in a large gap in the magnetic circuit and the need for an independent metal shield, which makes the device thick and difficult to meet the requirements of ultra-thin electronic devices. The signal transmission line adopts a planar direct connection design, which occupies a large PCB area, resulting in a large length and width of the device.

[0003] Therefore, there is an urgent need to improve miniaturized surface mount circulators to solve the aforementioned problems. Utility Model Content

[0004] The purpose of this invention is to provide a miniaturized surface-mount circulator. By using a flat magnetic core, a ring-shaped permanent magnet array, a spiral microstrip line, and a compact pin layout, the length and width dimensions are reduced, the thickness is decreased, and the overall volume is reduced. The middle signal layer is a spiral trace that achieves a longer electrical length within a limited radius by multiple turns, making full use of the space inside the circulator and maintaining a small physical size.

[0005] To achieve the above objectives, the main technical solution adopted by this utility model includes: a shell, a ferrite core, a permanent magnet assembly, a microstrip circuit board, and a pin assembly. The ferrite core is a flat cylindrical shape, and a positioning recess is provided on the bottom surface of the ferrite core. The positioning recess is precisely matched with the central positioning post of the shell. The permanent magnet assembly consists of fan-shaped permanent magnets distributed circumferentially around the ferrite core and positioned by the dovetail tenon structure of the fan-shaped slot of the shell. The microstrip circuit board adopts a three-layer composite substrate, with the middle signal layer having spiral traces and the signal ports arranged in an equilateral triangle layout. The pin assembly is inverted L-shaped.

[0006] Preferably, the permanent magnet is a neodymium iron boron sector-shaped permanent magnet with a pure iron magnetic conductive layer plated on the inner arc surface, and the magnetic poles are uniformly oriented towards the center of the magnetic core.

[0007] Preferably, the bottom layer of the microstrip circuit board is an alumina ceramic substrate, the bottom surface is fully covered with copper ground, and a positioning via with a diameter of 0.2mm is provided at the edge.

[0008] Preferably, the middle layer of the microstrip circuit board is a polyimide flexible substrate, and the spiral traces are arranged around the center of the magnetic core.

[0009] Preferably, the bottom of the outer casing is provided with substrate positioning protrusions, which are embedded in the through holes of the ceramic substrate.

[0010] Preferably, the vertical segment of the pin is provided with a serrated anti-slip texture.

[0011] This utility model has at least the following beneficial effects:

[0012] 1. By using flat magnetic cores, toroidal permanent magnet arrays, spiral microstrip lines, and compact pin layout, the length and width dimensions are reduced, the thickness is decreased, and the overall volume is reduced. The middle signal layer is a spiral trace that achieves a longer electrical length by multiple loops within a limited radius, making full use of the space inside the circulator and maintaining a small physical size. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0014] Figure 1 This is an exploded structural diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the isometric structure provided by this utility model;

[0016] Figure 3 This is an exploded view of the microstrip circuit board provided by this utility model;

[0017] Figure 4 This is a schematic diagram of the bottom structure of the microstrip circuit board provided by this utility model.

[0018] In the diagram, 1. Outer shell; 2. Ferrite core; 3. Permanent magnet assembly; 4. Microstrip circuit board; 5. Pin group; 7. Positioning via; 8. Spiral trace; 9. Positioning recess; 11. Center positioning post of outer shell; 12. Fan-shaped slot of outer shell; 13. Positioning bump of substrate; 15. Serrated anti-slip texture; 16. Middle layer of microstrip circuit board; 17. Permanent magnet; 18. Pure iron magnetic conductive layer. Detailed Implementation

[0019] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0020] like Figures 1-4As shown, the miniaturized surface-mount circulator provided in this embodiment features a flat cylindrical ferrite core 2. The positioning recess 9 on its bottom surface precisely matches the positioning post 11 at the center of the outer shell, ensuring accurate positioning of the core within the outer shell 1. This reduces the magnetic circuit gap in traditional split layouts, thereby reducing the device thickness. The permanent magnet group 3 consists of four fan-shaped permanent magnets 17 arranged circumferentially around the ferrite core 2 and positioned by the dovetail tenon structure of the fan-shaped slot 12 in the outer shell. This ring array layout replaces the traditional block layout, further reducing the volume. The microstrip circuit board 4 uses a three-layer composite substrate. The middle signal layer is a spiral trace 8, and the middle layer 16 of the microstrip circuit board is a polyimide flexible substrate. The spiral trace 8 circles around the center of the core, achieving a longer electrical length through multiple circles within a limited radius, making full use of the internal space of the circulator. The pin group 5 is inverted L-shaped, and the compact pin layout further reduces the length and width of the device, achieving an overall reduction in volume.

[0021] Furthermore, the permanent magnet 17 is a neodymium iron boron sector-shaped permanent magnet with a pure iron magnetic permeable layer 18 plated on the inner arc surface. The magnetic poles are uniformly oriented towards the center of the magnetic core. The characteristics of neodymium iron boron material ensure a stable magnetic field strength, and the pure iron magnetic permeable layer can optimize the magnetic circuit distribution, making the magnetic field more concentrated in the center of the magnetic core and improving the device performance.

[0022] The microstrip circuit board has an alumina ceramic substrate as its bottom layer, with the bottom surface fully covered with copper grounding. Four positioning vias 7 with a diameter of 0.2mm are set on the edge. The alumina ceramic substrate has good electrical insulation and heat dissipation. The full copper grounding design can provide a stable grounding plane. The positioning vias 7 are used to embed with the substrate positioning bumps 13 on the bottom of the housing 1 to ensure the precise positioning of the microstrip circuit board 4 in the housing.

[0023] Among them, the substrate positioning protrusion 13 set at the bottom of the outer shell 1 is embedded in the ceramic substrate through hole 7. This positioning method enhances the stability of the microstrip circuit board 4 installation. The vertical section of the pin 5 is provided with serrated anti-slip texture 15, which prevents the pin from shifting during the soldering process.

[0024] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0025] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes that element.

[0026] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A miniaturized surface-mount circulator comprising a housing (1), a ferrite core (2), a permanent magnet set (3), a microstrip circuit board (4) and a pin set (5), characterized in that: The ferrite core (2) is a flat cylindrical shape. The bottom surface of the ferrite core (2) is provided with a positioning recess (9). The positioning recess (9) is precisely matched with the central positioning post (11) of the outer shell. The permanent magnet group (3) consists of 4 fan-shaped permanent magnets (17) distributed around the ferrite core (2) in a circumferential direction. It is positioned by the dovetail tenon structure of the fan-shaped slot (12) of the outer shell. The microstrip circuit board (4) adopts a three-layer composite substrate. The middle signal layer is a spiral trace (8). The pin group (5) is an inverted L shape.

2. A compact surface-mount circulator according to claim 1, characterized in that: The permanent magnet (17) is a neodymium iron boron sector-shaped permanent magnet with a pure iron magnetic conductive layer (18) plated on the inner arc surface, and the magnetic poles are uniformly oriented towards the center of the magnetic core.

3. A compact surface-mount circulator according to claim 1, characterized in that: The bottom layer of the microstrip circuit board is an alumina ceramic substrate, the bottom surface is fully covered with copper ground, and four positioning vias with a diameter of 0.2mm are set on the edge (7).

4. A miniaturized surface-mount circulator according to claim 1, characterized in that: The middle layer (16) of the microstrip circuit board is a polyimide flexible substrate, and the spiral traces (8) are arranged around the center of the magnetic core.

5. A compact surface-mount circulator according to claim 1, wherein: The bottom of the outer shell (1) is provided with a substrate positioning protrusion (13), which is embedded in the positioning through hole (7) of the ceramic substrate.

6. A compact surface-mount circulator according to claim 1, characterized in that: The vertical section of the pin group (5) is provided with a serrated anti-slip texture (15).

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