Dielectric filters, radio transceiver equipment

Abstract

The dielectric filter provided by the present invention has negative coupling grooves formed on the bonding surfaces of two adjacent dielectric resonators, and covers the conductive layer on the body surface and the inner wall surface of the debugging hole of the dielectric resonator, and makes the negative coupling groove not covered by the conductive layer, so that the two negative coupling grooves are connected to each other to form a negative coupling cavity. The negative coupling cavity includes two parallel cavities perpendicular to the upper surface of the dielectric resonator body and parallel to each other, and a connecting cavity connecting the lower ends of the two parallel cavities, and the upper ends of the two parallel cavities are separated by the conductive layer, so that the capacitive coupling between the two adjacent dielectric resonators can be achieved through the negative coupling cavity, and no through hole or deep blind hole is required to be provided, so that the shrinkage or collapse of the ceramic material during high-temperature sintering is avoided, so that the electrical performance of the dielectric filter is more stable, and the size of the dielectric filter is reduced. The present invention also provides a radio transceiver including the above dielectric filter.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a dielectric filter and a radio transceiver. Background Art

[0002] With the advent of the "big bang" era of 5G communications, electronic communication equipment is gradually becoming popular around the world, and filters are an important part of electronic communication equipment, determining key factors such as the radiation range and signal strength of electronic base stations.

[0003] Traditional filters have defects such as large size, high loss, and low dielectric constant, which cannot meet the needs of 5G communications. As a result, dielectric waveguide filters came into being. At the same resonant frequency, the dielectric constant of the dielectric material is higher and the size is smaller. With the continuous improvement of base station performance, the performance requirements of filters are also getting higher and higher. Traditional dielectric waveguide filters mostly use inductive coupling, which is difficult to meet specific electrical performance requirements such as suppression of the near end of the filter frequency band. To solve this problem, dielectric filters using capacitive coupling have appeared on the market. For example, international patent application WO 2018148905 A1 discloses a dielectric filter that realizes capacitive coupling between resonant cavities by setting through holes and conductive isolation layers on the dielectric block. For example, Chinese invention patent CN104604022B discloses a dielectric filter that realizes capacitive coupling between resonators on both sides of the blind hole by drilling a blind hole on a body made of solid dielectric material. However, international patent application WO2018148905 The negative coupling hole in A1 is a through hole. The depth of the negative coupling hole in Chinese invention patent CN104604022B is at least twice the depth of the debugging hole. Since the depths of the negative coupling holes in the above two technical solutions are relatively large, they will shrink or collapse when the ceramic material is sintered at high temperature, causing significant changes in the shape and precision of the negative coupling hole, affecting the electrical performance of the dielectric filter and resulting in a low yield rate. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a dielectric filter that realizes capacitive coupling between dielectric filters by setting a negative coupling cavity, avoids opening through holes or deep blind holes on the dielectric filter, and further avoids shrinkage or collapse during high-temperature sintering of ceramic materials, has stable electrical properties and a high yield rate. The present invention also provides a radio transceiver including the dielectric filter.

[0005] To achieve the above object, the technical solution adopted by the present invention is that a dielectric filter includes at least two dielectric resonators, namely a first dielectric resonator and a second dielectric resonator, each of which includes a dielectric resonator body made of a ceramic material and a debugging hole located on the upper surface of the dielectric resonator body, wherein the debugging hole is a blind hole and is used to debug the resonant frequency of the dielectric resonator in which it is located;

[0006] Each of the dielectric resonators further comprises a conductive layer covering the surface of the dielectric resonator body and the inner wall surface of the debugging hole;

[0007] A first negative coupling groove is provided on one side surface of the first dielectric resonator, and a groove bottom of the first negative coupling groove is not covered by the conductive layer, so that the groove bottom exposes the first dielectric resonator body;

[0008] A second negative coupling groove is provided on one side surface of the second dielectric resonator, and a groove bottom of the second negative coupling groove is not covered by the conductive layer, so that the groove bottom exposes the second dielectric resonator body;

[0009] The side surface of the first dielectric resonator where the first negative coupling slot is located is attached to the side surface of the second dielectric resonator where the second negative coupling slot is located, so that the first dielectric resonator and the second dielectric resonator are connected as a whole, and all the dielectric resonators are connected as a whole to form the dielectric filter;

[0010] The notches of the first negative coupling slot and the second negative coupling slot are connected to each other, so that the first negative coupling slot and the second negative coupling slot are connected to form a negative coupling cavity, the negative coupling cavity includes two parallel cavities which are respectively perpendicular to the upper surface of the first dielectric resonator body and parallel to each other, the upper ends of the two parallel cavities are separated by the conductive layer, the negative coupling cavity also includes a connecting cavity connecting the lower ends of the two parallel cavities, and the negative coupling cavity is used to realize capacitive coupling between the first dielectric resonator and the second dielectric resonator.

[0011] Preferably, the axis center line of the debugging hole of the first dielectric resonator and the axis center line of the debugging hole of the second dielectric resonator form a virtual plane, and the two parallel cavities are symmetrically distributed on both sides of the plane.

[0012] Preferably, the depth of the first negative coupling groove is greater than or equal to the thickness of the conductive layer and less than twice the thickness of the conductive layer, and the depth of the second negative coupling groove is greater than or equal to the thickness of the conductive layer and less than twice the thickness of the conductive layer.

[0013] Preferably, the connecting cavity is an arc-shaped cavity.

[0014] Preferably, the connecting cavity is a linear cavity.

[0015] Further preferably, the connecting cavity is parallel to the upper surface of the first dielectric resonator.

[0016] Preferably, the first negative coupling slot and the second negative coupling slot have exactly the same shape.

[0017] Preferably, the distance between the two parallel cavities is smaller than the diameter of the debugging hole.

[0018] To achieve the above object, the technical solution adopted by the present invention also includes a radio transceiver device, including any one of the dielectric filters described above.

[0019] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0020] The dielectric filter provided by the present invention has negative coupling grooves formed on the bonding surfaces of two adjacent dielectric resonators, and covers the conductive layer on the body surface and the inner wall surface of the debugging hole of the dielectric resonator, and makes the negative coupling groove not covered by the conductive layer, so that the two negative coupling grooves are connected to each other to form a negative coupling cavity. The negative coupling cavity includes two parallel cavities perpendicular to the upper surface of the dielectric resonator body and parallel to each other, and a connecting cavity connecting the lower ends of the two parallel cavities, and the upper ends of the two parallel cavities are separated by the conductive layer, so that the capacitive coupling between the two adjacent dielectric resonators can be achieved through the negative coupling cavity, and no through hole or deep blind hole is required to be provided, so that the shrinkage or collapse of the ceramic material during high-temperature sintering is avoided, so that the electrical performance of the dielectric filter is more stable, the yield rate is high, and the size of the dielectric filter is reduced. The present invention also provides a radio transceiver including the above dielectric filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application 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 recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a three-dimensional perspective schematic diagram of the dielectric filter embodiment 1 of the present invention.

[0023] Figure 2 for Figure 1 Cross-sectional view along the AA direction.

[0024] Figure 3 for Figure 1 Cross-sectional view along the BB direction.

[0025] Figure 4 for Figure 1 Cross-sectional view along CC direction.

[0026] Figure 5 for Figure 1 Schematic top view of .

[0027] Figure 6 for Figure 5 Cross-sectional view along the DD direction.

[0028] Figure 7 for Figure 5 Cross-sectional view along the EE direction.

[0029] Figure 8 for Figure 5 Cross-sectional view in the FF direction.

[0030] Fig. 9 It is a perspective schematic diagram of a dielectric filter embodiment 2 of the present invention.

[0031] Fig.10 for Fig. 9 Schematic diagram of the main view.

[0032] Fig.11 It is a three-dimensional perspective schematic diagram of Example 3 of the dielectric filter in the present invention.

[0033] Fig.12 for Fig.11 Schematic diagram of the main view.

[0034] Fig.13 It is a three-dimensional perspective schematic diagram of the dielectric filter embodiment 4 of the present invention.

[0035] Fig.14 for Fig.13 Schematic diagram of the main view.

[0036] Fig.15 It is a perspective schematic diagram of a dielectric filter embodiment 5 of the present invention.

[0037] Fig.16 for Fig.15 Schematic diagram of the main view.

[0038] Fig.17 It is a three-dimensional perspective schematic diagram of the dielectric filter embodiment 6 of the present invention.

[0039] Fig.18 for Fig.17 Schematic diagram of the main view.

[0040] Fig.19 It is a perspective schematic diagram of a dielectric filter embodiment 7 of the present invention.

[0041] Fig. 20for Fig.19 Schematic diagram of the main view.

[0042] Fig.21 It is a three-dimensional perspective schematic diagram of Example 8 of the dielectric filter in the present invention.

[0043] Fig. 22 for Fig.21 Schematic diagram of the main view.

[0044] Fig.23 It is a perspective schematic diagram of a dielectric filter embodiment 9 of the present invention.

[0045] Fig.24 for Fig.23 Schematic diagram of the main view.

[0046] Fig.25 This is a diagram of the electrical performance of dielectric filter embodiment 1 of the present invention.

[0047] Wherein: 100. dielectric filter; 200. first dielectric resonator; 201. first dielectric resonator body; 202. first debugging hole; 203. first conductive layer; 204. first negative coupling slot; 300. second dielectric resonator; 301. second dielectric resonator body; 302. second debugging hole; 303. second conductive layer; 304. second negative coupling slot; 400. negative coupling cavity; 401. parallel cavity; 402. connecting cavity; 403 auxiliary cavity. DETAILED DESCRIPTION

[0048] The following will describe the technical solutions in the embodiments of the present invention in detail in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Example 1

[0052] like Figure 1-8 As shown, the dielectric filter 100 provided by the present invention includes two dielectric resonators, namely a first dielectric resonator 200 and a second dielectric resonator 300. The first dielectric resonator 200 and the second dielectric resonator 300 have the same structure. The first dielectric resonator 200 includes a first dielectric resonator body 201 made of ceramic material and a first debugging hole 202 located on the upper surface of the first dielectric resonator body 201. The first debugging hole 202 is a blind hole. The first debugging hole 202 is used to debug the resonant frequency of the first dielectric resonator 200. The first dielectric resonator 200 also includes A first conductive layer 203 covers the surface of the first dielectric resonator body 201 and the inner wall surface of the first debugging hole 202; the second dielectric resonator 300 includes a second dielectric resonator body 301 made of a ceramic material and a second debugging hole 302 located on the upper surface of the second dielectric resonator body 301, the second debugging hole 302 is a blind hole, and the second debugging hole 302 is used to debug the resonant frequency of the second dielectric resonator 300, and the second dielectric resonator 300 also includes a second conductive layer 303 covering the surface of the second dielectric resonator body 301 and the inner wall surface of the second debugging hole 302.

[0053] A first negative coupling slot 204 is provided on the right side of the first dielectric resonator 200, and the bottom of the first negative coupling slot 204 is not covered by the first conductive layer 203, so that the bottom of the first negative coupling slot 204 exposes the first dielectric resonator body 201; a second negative coupling slot 304 is provided on the left side of the second dielectric resonator 300, and the bottom of the second negative coupling slot 304 is not covered by the second conductive layer 303, so that the bottom of the second negative coupling slot 304 exposes the second dielectric resonator body 301.

[0054] The right side surface of the first dielectric resonator 200 is attached to the left side surface of the second dielectric resonator 300 , so that the first dielectric resonator 200 and the second dielectric resonator 300 are connected as a whole. All dielectric resonators are connected as a whole to form a dielectric filter 100 .

[0055] The right side of the first dielectric resonator 200 is in contact with the left side of the second dielectric resonator 300

[0056] When the first negative coupling slot 204 and the second negative coupling slot 304 are connected, the first negative coupling slot 204 and the second negative coupling slot 304 are connected to form a negative coupling cavity 400. The negative coupling cavity 400 includes two parallel cavities 401 which are respectively perpendicular to the upper surface of the first dielectric resonator body 201 and parallel to each other. The distance between the two parallel cavities 401 is smaller than the diameter of the first debugging hole 202 / the second debugging hole 302. The upper ends of the two parallel cavities 401 are separated by the first conductive layer 203 and the second conductive layer 303. The negative coupling cavity 400 also includes a connecting cavity 402 for connecting the lower ends of the two parallel cavities 401. In this embodiment, the connecting cavity 402 is in an open square shape. The length of the bottom side of the connecting cavity 402 is greater than the diameter of the first debugging hole 202 / the second debugging hole 302. The negative coupling cavity 400 is used to achieve capacitive coupling between the first dielectric resonator 200 and the second dielectric resonator 300.

[0057] The axis line of the first debugging hole 202 and the axis line of the second debugging hole 302 are parallel to each other and form a virtual plane. The two parallel cavities 401 are symmetrically distributed on both sides of the plane.

[0058] The first negative coupling slot 204 and the second negative coupling slot 304 are completely the same in size and shape, and the depth of the first negative coupling slot 204, the depth of the second negative coupling slot 304, the thickness of the first conductive layer 203, and the thickness of the second conductive layer 303 are all equal.

[0059] like Fig.25 As shown, the dielectric filter 100 generates a transmission zero point A at the low end of the filter passband B through the negative coupling cavity 400; the strength of the transmission zero point A is adjusted by adjusting the enclosed area of ​​the connecting cavity 402 and the distance between the two parallel cavities 401 and the length of the two parallel cavities 401; the larger the enclosed area of ​​the connecting cavity 402, the stronger the transmission zero point A; the smaller the slot width at the bottom of the connecting cavity 402, the weaker the transmission zero point A; the longer the length of the two parallel cavities 401, the stronger the transmission zero point A.

[0060] Example 2

[0061] Embodiment 2 is substantially the same as Embodiment 1, except that the length of the bottom side of the connecting cavity 402 in Embodiment 2 is greater than the diameter of the first debugging hole 202 / the second debugging hole 302 .

[0062] Example 3

[0063] Embodiment 3 is substantially the same as Embodiment 1, except that the connection cavity 402 in Embodiment 3 is an arc-shaped cavity, and the length of the major axis of the ellipse where the connection cavity 402 is located is greater than the diameter of the first debugging hole 202 / the second debugging hole 302 .

[0064] Example 4

[0065] Embodiment 4 is substantially the same as Embodiment 1, except that the connection cavity 402 in Embodiment 4 is an arc-shaped cavity, and the diameter of the circle where the connection cavity 402 is located is smaller than the diameter of the first debugging hole 202 / the second debugging hole 302 .

[0066] Example 5

[0067] Embodiment 5 is basically the same as Embodiment 1, except that the connecting cavity 402 of Embodiment 5 is a trapezoidal cavity, and the two ends of the upper bottom of the trapezoidal cavity are respectively connected to the lower ends of the two parallel cavities.

[0068] Example 6

[0069] Example 6 is basically the same as Example 2, except that the upper ends of the two parallel cavities 401 of Example 6 are further connected to auxiliary cavities 403 , and the auxiliary cavities 403 extend outward in a direction perpendicular to the parallel cavities 401 .

[0070] Example 7

[0071] Example 7 is basically the same as Example 4, except that the upper ends of the two parallel cavities 401 of Example 7 are further connected to auxiliary cavities 403 , and the auxiliary cavities 403 extend outward in a direction perpendicular to the parallel cavities 401 .

[0072] Example 8

[0073] Embodiment 8 is substantially the same as Embodiment 1, except that the connecting cavity 402 of Embodiment 8 is a linear cavity, and the connecting cavity 402 is parallel to the upper surface of the first dielectric resonator body 201 .

[0074] Example 9

[0075] Embodiment 9 is substantially the same as Embodiment 8, except that the upper ends of the two parallel cavities 401 of Embodiment 9 are further connected to auxiliary cavities 403 , and the auxiliary cavities 403 extend outward in a direction perpendicular to the parallel cavities 401 .

[0076] The dielectric filter provided by the present invention has negative coupling grooves formed on the bonding surfaces of two adjacent dielectric resonators, and covers the conductive layer on the body surface and the inner wall surface of the debugging hole of the dielectric resonator, and makes the negative coupling groove not covered by the conductive layer, so that the two negative coupling grooves are connected to each other to form a negative coupling cavity, and the negative coupling cavity includes two parallel cavities perpendicular to the upper surface of the dielectric resonator body and parallel to each other and a connecting cavity connecting the lower ends of the two parallel cavities, and the upper ends of the two parallel cavities are separated by the conductive layer, so that the capacitive coupling between the two adjacent dielectric resonators can be realized through the negative coupling cavity, and no through hole or deep blind hole is required to be provided, so that the shrinkage or collapse phenomenon of the ceramic material during high-temperature sintering is avoided, so that the electrical performance of the dielectric filter is more stable, the yield rate is high, and the size of the dielectric filter is reduced.

[0077] The present invention further provides a radio transceiver device, which includes any one of the dielectric filters in the above embodiments. The dielectric filter in the radio transceiver device can be used to filter radio frequency signals.

[0078] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0079] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A dielectric filter, comprising at least two dielectric resonators, namely a first dielectric resonator and a second dielectric resonator, each of which comprises a dielectric resonator body made of a ceramic material and a debugging hole located on the upper surface of the dielectric resonator body, wherein the debugging hole is a blind hole, the debugging hole comprises a first debugging hole and a second debugging hole, and the debugging hole is used to debug the resonant frequency of the dielectric resonator in which it is located; each of the dielectric resonators further comprises a conductive layer covering the surface of the dielectric resonator body and the inner wall surface of the debugging hole; A first negative coupling groove is provided on one side surface of the first dielectric resonator, and a groove bottom of the first negative coupling groove is not covered by the conductive layer, so that the groove bottom exposes the first dielectric resonator body; A second negative coupling groove is provided on one side surface of the second dielectric resonator, and a groove bottom of the second negative coupling groove is not covered by the conductive layer, so that the groove bottom exposes the second dielectric resonator body; The side surface of the first dielectric resonator where the first negative coupling slot is located is attached to the side surface of the second dielectric resonator where the second negative coupling slot is located, so that the first dielectric resonator and the second dielectric resonator are connected as a whole, and all the dielectric resonators are connected as a whole to form the dielectric filter; The notches of the first negative coupling slot and the second negative coupling slot are connected to each other, so that the first negative coupling slot and the second negative coupling slot are connected to form a negative coupling cavity; Features: The negative coupling cavity comprises two parallel cavities which are respectively perpendicular to the upper surface of the first dielectric resonator body and parallel to each other, the upper ends of the two parallel cavities are separated by the conductive layer, and the distance between the two parallel cavities is smaller than the diameters of the first debugging hole and the second debugging hole; the negative coupling cavity also comprises a connecting cavity which connects the lower ends of the two parallel cavities, the connecting cavity is in an open mouth shape, and the length of the bottom side of the connecting cavity is larger than the diameters of the first debugging hole and the second debugging hole; the negative coupling cavity is used to realize capacitive coupling between the first dielectric resonator and the second dielectric resonator.

2. The dielectric filter according to claim 1, characterized in that: The axis center line of the debugging hole of the first dielectric resonator and the axis center line of the debugging hole of the second dielectric resonator form a virtual plane, and the two parallel cavities are symmetrically distributed on both sides of the plane.

3. The dielectric filter according to claim 1, characterized in that The depth of the first negative coupling groove is greater than or equal to the thickness of the conductive layer and less than twice the thickness of the conductive layer. The depth of the second negative coupling groove is greater than or equal to the thickness of the conductive layer and less than twice the thickness of the conductive layer.

4. The dielectric filter according to claim 1, characterized in that: The first negative coupling slot and the second negative coupling slot have exactly the same shape.

5. The dielectric filter according to claim 1, characterized in that: The upper ends of the two parallel cavities are connected with auxiliary cavities, and the auxiliary cavities extend outwards in a direction perpendicular to the parallel cavities.

6. Radio transceiver equipment, characterized in that The invention comprises the dielectric filter according to any one of claims 1 to 5.

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