A high-frequency ceramic dielectric filter

Abstract

This invention provides a high-frequency ceramic dielectric filter, comprising a ceramic dielectric body made of microwave powder with ultra-low relative permittivity; an open surface, a short surface, and a side surface arranged opposite each other; a metal covering layer on the side surface; at least two through holes in the ceramic dielectric body; a first metal loading layer on the inner peripheral wall of the through holes; a second metal loading layer on the open surface; an input electrode and an output electrode respectively disposed at two corners of the side surface; the input electrode and the output electrode are capacitively coupled to adjacent through holes; adjacent through holes are capacitively coupled through capacitive slots; cross coupling lines are disposed on the open surface; the relative permittivity of the microwave powder is 5±0.5; and a metal shield is welded to the ceramic dielectric body. This high-frequency ceramic dielectric filter can achieve a center frequency of over 9000MHz and has a moderate size, facilitating mass production.

Description

Technical Field

[0001] This utility model relates to the field of ceramic dielectric filter technology, and more specifically, to a high-frequency ceramic dielectric filter. Background Technology

[0002] Monoblock ceramic dielectric filters typically refer to filter / resonator structures that are fired from a single piece of ceramic without the need for assembly. Through the coupling between dielectric resonators, these filters achieve high Q values ​​and low insertion losses. Currently, monoblock ceramic dielectric filters are generally used in communication applications with center frequencies of 600-8000MHz. The center frequencies of these filters rarely exceed 8000MHz, primarily due to material limitations. Furthermore, theoretically, for center frequencies above 8000MHz, the size of the product, especially the height dimension of the resonators, is very small, resulting in higher manufacturing costs and more demanding tuning techniques, making mass production difficult. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a high-frequency ceramic dielectric filter to solve the above problems.

[0004] The present invention adopts the following solution:

[0005] This application provides a high-frequency ceramic dielectric filter, comprising a ceramic dielectric body made of microwave powder with ultra-low relative permittivity; the ceramic dielectric body includes an open surface and a short surface disposed opposite to each other, and side surfaces disposed around the open surface and the short surface; the side surfaces are provided with a metal covering layer; the ceramic dielectric body is provided with at least two parallel through holes with their central axes parallel to each other; a first metal loading layer is provided on the inner peripheral wall of the through holes; a second metal loading layer is provided on the open surface surrounding the through holes; an input electrode and an output electrode are respectively disposed at two corners of the side surfaces; the input electrode and the output electrode are capacitively coupled to adjacent through holes; adjacent through holes are capacitively coupled to each other through capacitive grooves; a cross coupling line is provided on the open surface away from the input electrode and the output electrode; the relative permittivity of the microwave powder is 5±0.5; a metal shield is welded to the side of the ceramic dielectric body near the cross coupling line.

[0006] Furthermore, the metal coating is a silver layer applied to the ceramic substrate by an immersion silver metallization process.

[0007] Furthermore, the silver layer has a thickness of 10 μm.

[0008] Furthermore, the metal loading layer is made by laser engraving a silver layer covering the ceramic medium body.

[0009] Furthermore, the metal shielding cover is made of copper alloy material and is formed by stamping.

[0010] Furthermore, a third metal loading layer is provided on the open surface, which is respectively connected to the input electrode and the output electrode, and at least surrounds a portion of the outer periphery adjacent to the first metal loading layer.

[0011] Furthermore, the ceramic medium body 1 has a length of 9.6 mm, a width of 3.8 mm, and a height of 2.4 mm.

[0012] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0013] The ceramic dielectric body of this application is made of microwave powder with an ultra-low relative permittivity of 5±0.5. The ceramic dielectric body has parallel through holes with their central axes parallel to each other, as well as a specific metal loading layer on the open surface, capacitive grooves, cross coupling lines and an external metal shield. This structure enables the center frequency of the filter to reach more than 9000MHz, and the size is moderate, which is conducive to mass production. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of a high-frequency ceramic dielectric filter structure according to an embodiment of the present invention;

[0016] Figure 2 This is an exploded structural diagram of a high-frequency ceramic dielectric filter according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the back structure of the ceramic dielectric body of a high-frequency ceramic dielectric filter according to an embodiment of the present invention;

[0018] Figure 4 This is an actual test waveform diagram of a high-frequency ceramic dielectric filter according to an embodiment of this utility model;

[0019] Icons: 1. Ceramic dielectric body, 2. Open surface, 3. Short surface, 4. Metal cover, 5. Metal shield, 6. Through hole, 71. Input electrode, 72. Output electrode, 9. Capacitive groove, 10. Cross coupling line, 11. Second metal loading layer, 12. Third metal loading layer. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] Example

[0022] Combination Figures 1 to 3 As shown, this embodiment provides a high-frequency ceramic dielectric filter, including a ceramic dielectric body 1, which is made of microwave powder with an ultra-low relative permittivity; the ceramic dielectric body 1 includes an open surface 2 and a short surface 3 arranged opposite to each other, and side surfaces disposed around the open surface 2 and the short surface 3; the side surfaces are provided with a metal coating layer 4, which is a 10µm thick silver layer covering the ceramic dielectric body 1 by a silver immersion metallization process; the ceramic dielectric body 1 is provided with three parallel through holes 6 with their central axes parallel to each other; the inner peripheral wall of the through holes 6 is provided with a first metal loading layer; the open surface 2 is provided with a second metal loading layer 11 around the outside of the through holes 6; the metal loading layer is made by laser engraving the silver layer covering the ceramic dielectric body 1.

[0023] An input electrode 71 and an output electrode 72 are respectively disposed at two corners of the side surface; a third metal loading layer 12 is disposed on the open surface 2, which connects the input electrode 71 and the output electrode 72 respectively, and at least surrounds a portion of the outer periphery of the adjacent first metal loading layer. The input electrode 71 and the output electrode 72 are capacitively coupled to the adjacent through holes 6; adjacent through holes 6 are capacitively coupled to each other through capacitive grooves 9; a cross coupling line 10 is disposed on the open surface 2 on the side away from the input electrode 71 and the output electrode 72; the relative permittivity of the microwave powder is 5±0.5; a metal shield 5 is welded to the side of the ceramic dielectric body 1 near the cross coupling line 10, and the metal shield 5 is made of copper alloy material and is stamped.

[0024] like Figure 4The image shown is an actual test waveform of this utility model. The center frequency of the product is 9350MHz, which is far greater than the center frequency of 8000MHz of the existing Monoblock filter. Its center insertion loss is as low as 1.8dB, the passband range is 9200MHz-9500MHz, it has a large bandwidth of 300MHz, and the suppression of DC-9000MHz is greater than 18dB.

[0025] The ceramic dielectric body 1 of this application is made of microwave powder with an ultra-low relative permittivity of 5±0.5. The ceramic dielectric body 1 has parallel through holes 6 with their central axes parallel to each other, as well as a specific metal loading layer, capacitive groove 9, cross coupling line 10 and external metal shield 5 on the open surface 2. The structure enables the center frequency of the filter to reach more than 9000MHz and can be made into a moderate size with a length of 9.6mm, a width of 3.8mm and a height of 2.4mm, which is conducive to mass production.

[0026] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions that fall within the scope of this utility model's concept are protected by this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A high-frequency ceramic dielectric filter comprising a ceramic dielectric main body (1), characterized in that, The ceramic dielectric body (1) is made of microwave powder with ultra-low relative permittivity; the ceramic dielectric body (1) includes an open surface (2) and a short surface (3) arranged opposite to each other, and a side surface disposed around the open surface (2) and the short surface (3); the side surface is provided with a metal covering layer (4); the ceramic dielectric body (1) is provided with at least two parallel through holes (6) with their central axes parallel to each other; the inner peripheral wall of the through hole (6) is provided with a first metal loading layer; a second metal loading layer (11) is provided on the open surface (2) around the outside of the through hole (6); the side surface An input electrode (71) and an output electrode (72) are respectively provided at two corners; the input electrode (71) and the output electrode (72) are capacitively coupled to the adjacent through hole (6); the adjacent through holes (6) are capacitively coupled to each other through a capacitive groove (9); a cross coupling line (10) is provided on the open surface (2) on the side away from the input electrode (71) and the output electrode (72); the relative permittivity of the microwave powder is 5±0.5; a metal shield (5) is welded to the side of the ceramic dielectric body (1) near the cross coupling line (10).

2. The high frequency ceramic dielectric filter according to claim 1, characterized by, The metal coating (4) is a silver layer that is coated on the ceramic medium body (1) by a silver immersion metallization process.

3. The high frequency ceramic dielectric filter according to claim 2, characterized by, The thickness of the silver layer is 10 μm.

4. The high-frequency ceramic dielectric filter according to claim 2, characterized in that, The metal loading layer is made by laser engraving a silver layer covering the ceramic medium body (1).

5. The high-frequency ceramic dielectric filter according to claim 1, characterized in that, The metal shield (5) is made of copper alloy material and is formed by stamping.

6. The high-frequency ceramic dielectric filter according to claim 1, characterized in that, The open surface (2) is provided with a third metal loading layer (12) that connects the input electrode (71) and the output electrode (72) respectively, and at least surrounds a portion of the outer periphery of the adjacent first metal loading layer.

7. The high-frequency ceramic dielectric filter according to any one of claims 1-6, characterized in that, The ceramic medium body (1)1 has a length of 9.6 mm, a width of 3.8 mm, and a height of 2.4 mm.

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