Coupling devices and filters

Abstract

The application provides a coupling device and a filter. The coupling device comprises two first resistance layers arranged oppositely, a ground electrode, a first electromagnetic shielding layer and a second electromagnetic shielding layer arranged oppositely between the two first resistance layers and connected with the ground electrode, an inductance assembly and an end electrode arranged between the first electromagnetic shielding layer and the second electromagnetic shielding layer, wherein the inductance assembly comprises inner electrodes and second resistance layers alternately and sequentially stacked in a second direction, and the inner electrodes are connected with the end electrode in correspondence; and the end electrode is arranged at a side of the inductance assembly and extends to a surface of the two first resistance layers away from the inductance assembly. The two electromagnetic shielding layers are arranged in the interior of the coupling device, so that the appearance defect rate is reduced, and the virtual connection of the electromagnetic shielding layer with the ground electrode and the short circuit of the electromagnetic shielding layer with the end electrode caused by deformation of the electromagnetic shielding layer are avoided.

Description

Technical Field

[0001] This application relates to the field of coupling device technology, specifically to a coupling device and a filter. Background Technology

[0002] With the rapid development of 5G communication technology, the number of communication frequency bands has increased, and the frequencies are gradually trending towards higher frequencies. Furthermore, different applications require different characteristics from coupling devices, such as filters. The modern communication market has become an arena for various coupling devices. Couplers based on LTCC (Low Temperature Co-fired Ceramic) technology have high dielectric constant and low loss characteristics, and therefore have been widely used. LTCC couplers are radio frequency devices integrating multiple LC (capacitor) structures. To reduce electromagnetic interference with other devices, LTCC couplers typically have an electromagnetic shielding layer, thereby increasing their immunity to electromagnetic interference.

[0003] Currently, electromagnetic shielding layers are typically printed on the outer surface of LTCC coupling devices. This process is not only difficult, but the wafers are also prone to deformation, which can lead to misalignment of the electromagnetic shielding layer and poor device appearance. In addition, electromagnetic shielding layers on the outer surface are susceptible to scratches and deformation during production and transportation. They are also prone to short-circuiting with the terminal electrodes connected to the inner electrodes, and the grounding electrode is prone to loose connection with the electromagnetic shielding layer during electroplating, thus affecting the reliability of the device. Summary of the Invention

[0004] In view of this, this application provides a coupling device and a filter that can improve the problems of poor connection with the ground electrode, short connection with the end electrode, and poor appearance caused by deformation of the electromagnetic shielding layer.

[0005] This application provides a coupling device, comprising:

[0006] Two first resistive layers are positioned opposite each other along the second direction;

[0007] Grounding electrode;

[0008] The first electromagnetic shielding layer and the second electromagnetic shielding layer are disposed between the two first resistive layers and are disposed opposite to each other along the second direction, and are respectively connected to the grounding electrode;

[0009] An inductor assembly and a terminal electrode are disposed between the first electromagnetic shielding layer and the second electromagnetic shielding layer; the inductor assembly includes an inner electrode and a second resistive layer that are alternately stacked along the second direction, and the inner electrode is correspondingly connected to the terminal electrode; the terminal electrode is disposed on the side of the inductor assembly and extends to the surface of the two first resistive layers away from the inductor assembly.

[0010] Optionally, the coupling device includes four grounding electrodes respectively disposed on four end faces, the four end faces being arranged opposite each other and all perpendicular to the first electromagnetic shielding layer and the second electromagnetic shielding layer; the first electromagnetic shielding layer and the second electromagnetic shielding layer extend to the four end faces of the coupling device respectively, and are all connected to the four grounding electrodes.

[0011] Optionally, at least a portion of the grounding electrode is connected to the inner electrode extending to the corresponding end face.

[0012] Optionally, along the second direction, the orthographic projections of the first electromagnetic shielding layer and the second electromagnetic shielding layer coincide.

[0013] Optionally, the materials of the first electromagnetic shielding layer and the second electromagnetic shielding layer are metals and / or magnetic materials.

[0014] Optionally, the first electromagnetic shielding layer and / or the second electromagnetic shielding layer may be a full-surface structure or a mesh structure.

[0015] Optionally, along the second direction, the first electromagnetic shielding layer and the second electromagnetic shielding layer are in a ring shape.

[0016] Optionally, the thickness of both the first electromagnetic shielding layer and the second electromagnetic shielding layer is H2, and 0.01mm≦H2≦0.5mm.

[0017] Optionally, the length of the coupling device along the second direction is H1, H1 ≥ 1.0 mm; the length of the coupling device along the first direction is L, L ≥ 5.0 mm; the length of the coupling device along the third direction is W, W ≥ 5.0 mm; the first direction, the second direction and the third direction are perpendicular to each other.

[0018] This application provides a filter that includes any of the above-mentioned coupling devices.

[0019] As described above, the inductor component and the terminal electrode of this application are disposed between the first electromagnetic shielding layer and the second electromagnetic shielding layer, and are respectively connected to the ground electrode. The first electromagnetic shielding layer and the second electromagnetic shielding layer are disposed between two first resistive layers, which is equivalent to placing the electromagnetic shielding layer inside the coupling device. This can reduce the appearance defect rate, and the electromagnetic shielding layer will not suffer from appearance scratches or deformation during production and transportation. This can reduce the risk of short circuit with the terminal electrode and indirect connection with the ground electrode. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a coupling device provided in an embodiment of this application;

[0021] Figure 2This is a schematic diagram showing the positions of the first and second electromagnetic shielding layers in the coupling device.

[0022] Figure 3 This is a schematic diagram showing the position of a first electromagnetic shielding layer on a sheet, as provided in an embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly described below in conjunction with specific embodiments and corresponding drawings. Obviously, the embodiments described below are only a part of the embodiments of this application, and not all of them. Unless otherwise specified, the following embodiments and their technical features can be combined with each other, and also belong to the technical solutions of this application.

[0024] It should be understood that in the description of the embodiments of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solutions of the corresponding embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Please see Figure 1 The image shown is a coupling device 1 provided in an embodiment of this application, also referred to as coupling device 1. It should be noted that, for ease of observation and understanding of the arrangement of internal structural components, Figure 1 The following is an exemplary illustration using a perspective view, showing, for example, the positions and connections between some structural elements inside and outside the coupling device 1. In practical applications, this coupling device 1 can be fabricated based on LTCC technology, and therefore it can also be called an LTCC coupling device 1. The coupling device 1 includes: a first resistive layer 111, a first resistive layer 112, a first electromagnetic shielding layer 121, a second electromagnetic shielding layer 122, an inductor assembly (not shown), a terminal electrode 13, and a ground electrode 14.

[0026] The shape and dimensions (length, width, and height) of the coupling device 1 are not limited in this embodiment; for example, the shape can be... Figure 1 The cuboid or rectangle shown is a type of tetrahedron. The length direction of the coupling device 1 is the first direction x, the width direction is the third direction z, and the height direction is the second direction y. The first direction x, the second direction y, and the third direction z are all perpendicular to each other and can be regarded as the three coordinate axes of a three-dimensional rectangular coordinate system.

[0027] The term "perpendicular" as used throughout this application does not require the included angle between two points to be exactly 90°, but rather allows for a deviation of ±10°. In other words, "perpendicular" can be understood as an angle between any two directions ranging from 80° to 100°. Similarly, the term "parallel" as used throughout this application does not require the included angle between two points to be exactly 0° or 180°, but rather allows for a deviation of ±10°. In other words, "parallel" can be understood as an angle between any two directions ranging from 0° to 10° or from 170° to 190°.

[0028] The first resistive layer 111 and the first resistive layer 112 are arranged opposite each other along the second direction y.

[0029] A first electromagnetic shielding layer 121, a second electromagnetic shielding layer 122, and an inductor assembly are disposed between a first resistive layer 111 and a first resistive layer 112. The inductor assembly includes multiple layers of inner electrodes and multiple layers of second resistive layers 113 alternately stacked along a second direction y. For example, along the second direction y, a first second resistive layer 113 is disposed on the first electromagnetic shielding layer 121, and a first inner electrode is disposed on the first second resistive layer 113. A second second resistive layer 113 is disposed on the first inner electrode, and a second inner electrode is disposed on the second second resistive layer 113, and so on. The second electromagnetic shielding layer 122 is disposed on the uppermost second resistive layer 113, and the first resistive layer 112 is disposed on the second electromagnetic shielding layer 122.

[0030] The first resistive layer 111 and the first resistive layer 112 can also be referred to as the upper cover plate and the lower cover plate, respectively. Together, they form the housing of the coupling device 1. The shape and size of these two layers are adapted to the shape and size of the coupling device 1, which not only defines the appearance of the coupling device 1 but also protects its internal structural components, such as multiple internal electrodes and inductor assemblies. The first resistive layer 111 and the first resistive layer 112 (along...) Figure 1 The thickness of the second direction y) shown can be equal. In addition, the material of the second resistive layer 113 of the inductor component is the same, which can be a semiconductor material with nonlinear characteristics. For example, it can be a structure formed by stacking multiple cast LTCC films. The main component of the LTCC film can be zinc oxide (ZnO) and contains oxides of at least one of the secondary components that form nonlinear characteristics, such as bismuth (Bi), cobalt (Co), titanium (Ti), nickel (Ni), manganese (Mn), chromium (Cr), and antimony (Sb), such as Bi2O3, Co2O3, MnO2, Sb2O3, TiO2, Cr2O3, Ni2O3, etc.

[0031] The internal electrode of the inductor component is connected to the terminal electrode 13. The internal electrode can be made of conductive materials such as silver, palladium, platinum, or silver-palladium or silver-platinum alloy.

[0032] The terminal electrode 13 can also be made of the same material as the inner electrode. The terminal electrode 13 is disposed on the side of the inductor assembly and extends to the surfaces of the first resistive layers 111 and 112 away from the inductor assembly. Figure 1 The placement of the first resistor layer 111 extends to the upper surface of the first resistor layer 111 and the lower surface of the first resistor layer 112, or in other words, extends to the upper and lower surfaces of the coupling device 1.

[0033] In some scenarios, the coupling device 1 may be equipped with four terminal electrodes 13, which serve as the input terminal, output terminal, and two ground terminals, respectively. The function and working principle of these terminal electrodes 13 can be found in the descriptions of existing inductive components such as filters, and will not be elaborated here.

[0034] The first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122 are respectively connected to the grounding electrode 14, and the accumulated charge can be released to the ground through the grounding electrode 14. Optionally, the orthographic projections of the first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122 coincide along the second direction y, which is beneficial for fabrication.

[0035] For the aforementioned rectangular coupling device 1, in such a way... Figure 1 In one embodiment shown, the coupling device 1 includes four grounding electrodes 14 respectively disposed on four end faces. The four end faces are arranged opposite each other and are all perpendicular to the first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122. Figure 1 The four sides shown are front, back, left, and right. The first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122 extend to the four end faces of the coupling device 1, and are all connected to the four grounding electrodes 14.

[0036] Optionally, some of these four grounding electrodes 14 are also used for grounding the inner electrodes, that is, at least a portion of the grounding electrodes 14 are connected to the inner electrodes extending to the corresponding end faces, for example, Figure 1 The grounding electrode 14 on the front view end face and the grounding electrode 14 on the other end face opposite the front view end face (along the third direction z) are respectively connected to the inner electrode of their respective end faces.

[0037] In the above-mentioned coupling device 1, the inductor component and the terminal electrode 13 are disposed between the first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122, and are respectively connected to the ground electrode 14. The first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122 are disposed between the two first resistive layers 111 and 112, which is equivalent to placing the electromagnetic shielding layer inside the coupling device 1. This can reduce the appearance defect rate, and the first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122 will not have appearance scratches or deformation during production and transportation. This can reduce the risk of short circuit with the terminal electrode 13 and indirect connection with the ground electrode 14.

[0038] This application can use LTCC process to obtain the first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122 by printing, drying, laminating, cutting, debinding, sintering and other processes according to the traditional method of preparing electromagnetic shielding layers. In addition, by applying silver to the ends of the first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122 and burning silver, the electromagnetic shielding layer is connected to the corresponding grounding electrode 14, so that the electromagnetic shielding layer of LTCC coupling device 1 is set inside the product without affecting the electrical performance.

[0039] Specifically, in step one, a ceramic strip is cast onto a PET (Polyester Film) film, then cut into block-shaped products using a cutting machine. The cut block-shaped products are each printed with a first electromagnetic shielding layer 121, such as... Figure 3 As shown. Step two, repeat step one to complete the printing of the second electromagnetic shielding layer 122. Then, through processes such as lamination, cutting, and sintering, it is manufactured into a single product. The final product presents the first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122 inside the coupling device 1, as shown. Figure 2 As shown. Since the first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122 have the same shape, they can be fabricated in a single casting process, which simplifies the cutting process. Step three, following step two, after the end-point silvering and silvering processes, the aforementioned end electrodes 13 and ground electrodes 14 are printed on the corresponding end faces of the ceramic body completed in step two. This achieves the connection between the end electrodes 13 and the inner electrodes, electromagnetic shielding layer, and ground electrodes 14 on their corresponding end faces, thereby realizing the connection between the internal and external circuits. Finally, after subsequent processes such as testing, a product with the required electrical properties can be formed, such as... Figure 1 As shown.

[0040] The first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122 are both devices that can shield electromagnetic wave signals, and therefore their materials include, but are not limited to, metals and / or magnetic materials.

[0041] The embodiments of this application do not limit the shape of the first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122. For example, the first electromagnetic shielding layer 121 and / or the second electromagnetic shielding layer 122 may be annular along the second direction y. In some scenarios, such as... Figure 1 and Figure 2 As shown, the first electromagnetic shielding layer 121 and / or the second electromagnetic shielding layer 122 can be a full-surface structure. A full-surface structure can be understood as follows: within the area covered by the electromagnetic shielding layer, the electromagnetic shielding layer does not have any open or void areas. In other scenarios, the first electromagnetic shielding layer 121 and / or the second electromagnetic shielding layer 122 can be a mesh structure.

[0042] The dimensions and specifications of each component of the coupling device 1 are not limited in this embodiment. For example, the thickness of both the first electromagnetic shielding layer 121 and the second electromagnetic shielding layer 122 is H2, and 0.01mm ≤ H2 ≤ 0.5mm. The height of the coupling device 1 (i.e., the length along the second direction y) is H1, H1 ≥ 1.0mm; the length of the coupling device 1 (i.e., the length along the first direction x) is L, L ≥ 5.0mm; and the width of the coupling device 1 (i.e., the length along the third direction z) is W, W ≥ 5.0mm.

[0043] This application also provides a filter, including the coupling device 1 of any of the above embodiments, thus producing the beneficial effects of the coupling device 1 of the corresponding embodiments.

[0044] The electronic devices used in this application are not limited to those described in the embodiments.

[0045] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. For those skilled in the art, any equivalent structural transformations made using the content of this specification and drawings are similarly included within the patent protection scope of this application.

[0046] Although this document uses terms such as "first," "second," etc., to describe various types of information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. Furthermore, the singular forms "a," "an," and "the" are intended to also include the plural forms. The terms "or" and "and / or" are interpreted as inclusive, or meaning either one or any combination thereof. Exceptions to this definition only arise when combinations of elements, functions, steps, or operations are inherently mutually exclusive in some way.

Claims

1. A coupling device, characterized by The coupling device comprises: two first resistance layers arranged opposite to each other along a second direction; four ground electrodes arranged at four end faces of the coupling device, the four end faces being arranged opposite to each other in pairs; a first electromagnetic shielding layer and a second electromagnetic shielding layer arranged between the two first resistance layers and opposite to each other along the second direction, and connected with the ground electrodes respectively, the four end faces being perpendicular to the first electromagnetic shielding layer and the second electromagnetic shielding layer; an inductor assembly and an end electrode arranged between the first electromagnetic shielding layer and the second electromagnetic shielding layer, the inductor assembly comprising inner electrodes and second resistance layers alternately and sequentially stacked along the second direction, the inner electrodes being connected with the end electrode correspondingly, each of the inner electrodes extending to the four end faces of the coupling device, the four ground electrodes being connected with the inner electrodes extending to the corresponding end faces respectively, and the end electrode being arranged at a side of the inductor assembly and extending to surfaces of the two first resistance layers away from the inductor assembly.

2. The coupling device according to claim 1, wherein: the first electromagnetic shielding layer and the second electromagnetic shielding layer extend to the four end faces of the coupling device and are connected with the four ground electrodes respectively.

3. The coupling device according to claim 1 or 2, characterized in that The first electromagnetic shielding layer and the second electromagnetic shielding layer are coincident in orthographic projection along the second direction.

4. The coupling device of claim 1, wherein, The first electromagnetic shielding layer and the second electromagnetic shielding layer are made of metal and / or magnetic material.

5. The coupling device of claim 1, wherein, The first electromagnetic shielding layer and / or the second electromagnetic shielding layer are in full surface structure or grid shape.

6. The coupling device of claim 5, wherein, The first electromagnetic shielding layer and the second electromagnetic shielding layer are annular along the second direction.

7. The coupling device of claim 1, wherein, The first electromagnetic shielding layer and the second electromagnetic shielding layer have a thickness H2, and 0.01mm≦H2≦0.5mm.

8. The coupling device of claim 1, wherein, The coupling device has a length H1 along the second direction, H1≧1.0mm, a length L along a first direction, L≧5.0mm, and a length W along a third direction, W≧5.0mm, the first direction, the second direction and the third direction being perpendicular to each other in pairs.

9. A filter, characterized by The filter comprises the coupling device according to any one of claims 1 to 8.

Images