Cross coupling structure

Abstract

The utility model provides a cross coupling structure, which comprises a plurality of coupling cavity end faces, the plurality of coupling cavity end faces are sequentially arranged along a first direction, and the plurality of coupling cavity end faces comprise a first coupling cavity end face, a second coupling cavity end face and a third coupling cavity end face, wherein the third coupling cavity end face separates the first coupling cavity end face from the second coupling cavity end face, and at least one of the first coupling cavity end face and the second coupling cavity end face extends to form an extension part. The first coupling cavity end face and the second coupling cavity end face have an intersection portion in a second direction or a first direction through the extension portion.

Description

Technical Field

[0001] The utility model relates to a cross-coupling structure and belongs to the field of radio frequency filters. Background Art

[0002] RF filters are commonly used components in communication equipment, and there are many types and forms. Among them, metal duplexers and multiplexers are used in high-power wireless communication base station RF front-ends.

[0003] With the development of wireless communication technology, wireless communication base stations are increasingly densely distributed, and the volume requirements for base stations are getting smaller and smaller, and the volume requirements for filters are also getting smaller and smaller. Figure 5 As shown, the miniaturized filter in the prior art adopts a body made of solid dielectric material, and metallizes the surface of the body to form a resonator. The upper surface of the body is printed in a designed silver-plated layer, and the upper surface of the body is covered with a metal cover. The dielectric filter adopts a straight-row cavity structure, and the cross-coupling is achieved by adding a coupling line 10 on the end face of the filter. However, the cross-coupling coupling amount of this structure is relatively small, and strong cross-coupling cannot be achieved. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a cross-coupling structure with a reasonable structural design.

[0005] The technical solution adopted by the embodiment of the utility model to solve the above-mentioned problem is: a cross-coupling structure, characterized in that it includes a plurality of coupling cavity end faces, the plurality of coupling cavity end faces are arranged in sequence along a first direction, the plurality of coupling cavity end faces include a first coupling cavity end face, a second coupling cavity end face and a third coupling cavity end face, wherein the third coupling cavity end face separates the first coupling cavity end face and the second coupling cavity end face;

[0006] An extension portion extends from at least one of the first coupling cavity end surface and the second coupling cavity end surface, and the first coupling cavity end surface and the second coupling cavity end surface have an intersection portion in a second direction or in the first direction through the extension portion.

[0007] In the embodiment of the utility model, a first extension portion extends from the end surface of the first coupling cavity, and a second extension portion extends from the end surface of the second coupling cavity. At least a portion of the first extension portion and at least a portion of the second extension portion extend toward each other in the first direction, so that the first extension portion and the second extension portion have an intersection portion in the second direction or in the first direction.

[0008] The total length of the cross section described in the embodiment of the utility model is greater than 0.2 mm.

[0009] In the embodiment of the utility model, the first extension portion has a first part extending along the first direction, the second extension portion has a second part extending along the first direction, the first part and the second part have an intersection portion in the second direction, and there is a distance between the first part and the second part.

[0010] In the embodiment of the utility model, the distance between the first part and the second part is 0.1 to 0.5 mm.

[0011] In an embodiment of the utility model, the first extension portion has a first part extending along the first direction, the second extension portion has a second part extending in the opposite direction to the first direction, the first part and the second part have an intersection portion in the second direction, the first part is provided with a plurality of first walls along the second direction, the first wall is extended toward the second part, the second part is provided with a plurality of second walls along the second direction, the second wall is extended toward the first part, the first wall and the second wall have an intersection portion in the first direction, and the spacing between the first wall and the adjacent second wall is 0.1 to 0.5 mm.

[0012] In the embodiment of the utility model, the number of the first walls and the number of the second walls are both greater than or equal to 2.

[0013] In an embodiment of the utility model, the first extension portion has a first part extending along the first direction, the first part includes a first wall and a second wall respectively extending in opposite directions along the first direction, the first wall and the second wall maintain a distance in the second direction, and the second extension portion has a second part extending in the opposite direction along the first direction, the second part is inserted into the distance between the first wall and the second wall in the second direction.

[0014] In the embodiment of the utility model, the first extension portion has a first part extending along the first direction, the second extension portion has a second part extending along the first direction, the end of the first part has a first bending portion, and the end of the second part has a second bending portion corresponding to the first bending portion.

[0015] Compared with the prior art, the utility model has one or more of the following advantages or effects: simple structure and reasonable design; BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a structural schematic diagram of the cross-coupling structure in the first embodiment of the utility model.

[0018] Figure 2 It is a structural schematic diagram of the cross-coupling structure in the second embodiment of the utility model.

[0019] Figure 3 It is a structural schematic diagram of the cross-coupling structure in the third embodiment of the utility model.

[0020] Figure 4 It is a structural schematic diagram of the cross-coupling structure in the fourth embodiment of the utility model.

[0021] Figure 5 It is a structural schematic diagram of the prior art.

[0022] Figure 6 It is a simulation result diagram of the prior art structure.

[0023] Figure 7 It is a simulation structure diagram of the utility model structure. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described below. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood. The directions such as "axial direction", "above", "below", etc. in the following text are all for the purpose of more clearly indicating the structural position relationship and are not limitations on the present invention. In the present invention, the "vertical", "horizontal" and "parallel" are defined as: including the situation of ±10% based on the standard definition. For example, vertical usually refers to an angle of 90 degrees relative to the reference line, but in the present invention, vertical refers to the situation within 80 to 100 degrees.

[0025] See also Figures 1 to 4 The cross-coupling structure of this embodiment includes a coupling cavity end face 1, a signal input end face 2, a signal output end face 3 and a ground end face 4.

[0026] In this embodiment, a plurality of coupling cavity end faces 1 are provided, and the plurality of coupling cavity end faces 1 are arranged in sequence along a first direction X. One of the coupling cavity end faces 1 located at both ends corresponds to the signal input end face 2, and the other corresponds to the signal output end face 3. The plurality of coupling cavity end faces 1 are all corresponding to the ground end face 4.

[0027] The plurality of coupling cavity end faces 1 include a first coupling cavity end face 11 , a second coupling cavity end face 12 and a third coupling cavity end face 13 , wherein the third coupling cavity end face 13 separates the first coupling cavity end face 11 from the second coupling cavity end face 12 .

[0028] In this embodiment, an extension portion extends from at least one of the first coupling cavity end face 11 and the second coupling cavity end face 12, and the first coupling cavity end face 11 and the second coupling cavity end face 12 have a cross portion in a second direction Y or in the first direction X through the extension portion. The cross portion can make the first coupling cavity end face 11 and the second coupling cavity end face 12, two non-adjacent end faces, directly capacitively coupled, thereby realizing cross coupling, and the coupling strength can be significantly improved, thereby realizing a stronger cross coupling transmission zero point.

[0029] In this embodiment, the strength of the cross coupling can be further adjusted by controlling the length and spacing of the cross portions.

[0030] In this embodiment, a first extension portion 111 extends from the first coupling cavity end face 11, and a second extension portion 121 extends from the second coupling cavity end face 12. At least a portion of the first extension portion 111 and at least a portion of the second extension portion 121 extend toward each other in the first direction X, so that the first extension portion 111 and the second extension portion 121 have an intersection portion in the second direction Y or in the first direction X. The intersection portion is the overlapping portion of the projection of the adjacent portions of the first extension portion 111 and the second extension portion 121 (the projection in the first direction X or the second direction Y). Since the extension portion and the third coupling cavity end face 13 need to maintain a sufficient distance, by extending the extension portions from the first coupling cavity end face 11 and the second coupling cavity end face 12 respectively, the extension portion has fewer bends and the process is simpler.

[0031] The total length of the cross section in this embodiment is greater than 0.2 mm, so as to ensure a certain direct coupling strength.

[0032] like Figure 1As shown, in a first embodiment, the first extension portion 111 has a first portion 1111 extending along the first direction X, the second extension portion 121 has a second portion 1211 extending in the opposite direction of the first direction X, the first portion 1111 and the second portion 1211 have an intersection portion in the second direction Y, and there is a distance between the first portion 1111 and the second portion 1211. The first portion 1111 and the second portion 1211 are arranged in parallel.

[0033] In the embodiment of the utility model, the distance between the first part 1111 and the second part 1211 is 0.1 to 0.5 mm.

[0034] The coupling cavity end surface of this embodiment further includes a fourth coupling cavity end surface 14 and a fifth coupling cavity end surface 15. The fourth coupling cavity end surface 14, the first coupling cavity end surface 11, the third coupling cavity end surface 13, the second coupling cavity end surface 12 and the fifth coupling cavity end surface 15 are arranged in sequence.

[0035] like Figure 2 As shown, in a second embodiment, the first extension portion 111 has a first portion 1111 extending along the first direction X, the second extension portion 121 has a second portion 1211 extending in the opposite direction of the first direction X, the first portion 1111 and the second portion 1211 have an intersection portion in the second direction Y, the first portion 1111 is provided with a plurality of first walls 11111 along the second direction Y, the first wall is extended toward the second portion 1211, the second portion 1211 is provided with a plurality of second walls 12111 along the second direction Y, the second wall 12111 is extended toward the first portion 1111, the first wall 11111 and the second wall 12111 have an intersection portion in the first direction X, and the spacing between the first wall 1111 and the adjacent second wall is 0.1 to 0.3 mm. The first wall 11111 and the second wall 12111 are arranged at intervals. By providing the first wall 11111 and the second wall 12111, the coupling strength can be further enhanced.

[0036] In this embodiment, the number of the first walls 11111 and the number of the second walls 12111 are both greater than or equal to 2.

[0037] like Figure 3As shown, in a third embodiment, the first extension portion 111 has a first part 1111 extending along the first direction X, the first part 1111 includes a first wall 11112 and a second wall 11113 respectively extending along the first direction X, the first wall 11112 and the second wall 12113 maintain a spacing in the second direction Y, the second extension portion 121 has a second part 1211 extending in the opposite direction of the first direction X, the second part 1211 is inserted into the spacing between the first wall 11112 and the second wall 11113 in the second direction Y, thereby forming a cross portion for direct coupling.

[0038] like Figure 4 As shown, in a fourth embodiment, the first extension portion 111 has a first portion 1111 extending along the first direction X, the second extension portion 121 has a second portion 1211 extending in the opposite direction of the first direction X, the end of the first portion 1111 has a first bending portion 11114, and the end of the second portion 1211 has a second bending portion 12114 corresponding to the first bending portion 11114. A cross portion is formed between the first bending portion 11114 and the second bending portion 12114, and a direct coupling is formed.

[0039] like Figure 5 As shown, the second resonant cavity 92 and the fourth resonant cavity 94 are coupled to the coupling line 10 at the same time, thereby realizing indirect coupling between the end faces of the second resonant cavity 92 and the fourth resonant cavity 94, and realizing cross coupling. Figure 5 The structure realizes Figure 6 The simulation structure is as follows: a crossover transmission zero point A is generated at the low end of the filter passband, and the amplitude of zero point A is only -33.49dB.

[0040] Through the various embodiments of the present utility model, it is possible to produce Figure 7 The simulation structure is as follows: direct coupling is achieved after the first coupling cavity end face 11 and the second coupling cavity end face 12 are extended to achieve cross coupling. A very strong cross-coupling transmission zero point B is generated at the low end of the filter passband, and the amplitude of the zero point B can reach -10.57dB.

[0041] The above contents described in this specification are merely examples of the present utility model. Those skilled in the art of the present utility model may make various modifications or additions to the specific embodiments described, or replace them in similar ways, as long as they do not deviate from the contents of the present utility model specification or exceed the scope defined in the claims, they shall all fall within the protection scope of the present utility model.

Claims

1. A cross-coupling structure, characterized in that: It comprises a plurality of coupling cavity end faces, the plurality of coupling cavity end faces are arranged in sequence along a first direction, the plurality of coupling cavity end faces comprise a first coupling cavity end face, a second coupling cavity end face and a third coupling cavity end face, wherein the third coupling cavity end face separates the first coupling cavity end face and the second coupling cavity end face; An extension portion extends from at least one of the first coupling cavity end surface and the second coupling cavity end surface, and the first coupling cavity end surface and the second coupling cavity end surface have an intersection portion in a second direction or in the first direction through the extension portion.

2. The cross-coupling structure according to claim 1, characterized in that: A first extension portion extends from the end surface of the first coupling cavity, and a second extension portion extends from the end surface of the second coupling cavity. At least a portion of the first extension portion and at least a portion of the second extension portion extend toward each other in the first direction, so that the first extension portion and the second extension portion have an intersection portion in the second direction or in the first direction.

3. The coupling structure according to claim 2, characterized in that: The total length of the cross section is greater than 0.2 mm.

4. The cross-coupling structure according to claim 2, characterized in that: The first extension portion has a first portion extending along the first direction, the second extension portion has a second portion extending in the opposite direction to the first direction, the first portion and the second portion have an intersection portion in the second direction, and there is a distance between the first portion and the second portion.

5. The cross-coupling structure according to claim 4, characterized in that: The distance between the first portion and the second portion is 0.1 to 0.5 mm.

6. The cross-coupling structure according to claim 2, characterized in that: The first extension portion has a first part extending along the first direction, the second extension portion has a second part extending in the opposite direction to the first direction, the first part and the second part have an intersection portion in the second direction, the first part is provided with a plurality of first walls along the second direction, the first wall is extended toward the second part, the second part is provided with a plurality of second walls along the second direction, the second wall is extended toward the first part, the first wall and the second wall have an intersection portion in the first direction, and the spacing between the first wall and the adjacent second wall is 0.1 to 0.5 mm.

7. The cross-coupling structure according to claim 6, characterized in that: The number of the first walls and the number of the second walls are both greater than or equal to 2.

8. The cross-coupling structure according to claim 2, characterized in that: The first extension portion has a first part extending along the first direction, the first part includes a first wall and a second wall respectively extending along the first direction, the first wall and the second wall maintain a distance in the second direction, and the second extension portion has a second part extending in the opposite direction of the first direction, the second part is inserted into the distance between the first wall and the second wall in the second direction.

9. The cross-coupling structure according to claim 2, characterized in that: The first extension portion has a first part extending along the first direction, the second extension portion has a second part extending in the opposite direction of the first direction, the end of the first part has a first bending portion, and the end of the second part has a second bending portion corresponding to the first bending portion.

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