Dielectric filters and radio transceiver equipment

Abstract

The dielectric filter provided by the present invention comprises at least two dielectric resonators, wherein the dielectric resonator comprises a dielectric resonator body made of ceramic material and a debugging hole located on the surface of the dielectric resonator body. A negative coupling hole is opened on the upper surface of one of the dielectric resonator bodies and extends downwardly and penetrates the lower surface of the other dielectric resonator body, so that the upper hole opening of the negative coupling hole is completely located on the upper surface of one of the dielectric resonator bodies, and the lower hole opening of the negative coupling hole is completely located on the lower surface of the other dielectric resonator body, so that the negative coupling hole connects the two dielectric resonators, and the capacitive coupling between the two dielectric resonators can be realized through the negative coupling hole, the partition ring is omitted, the structure is simpler, the processing steps are fewer, the hole depth does not need to be accurately controlled, the performance is more stable, and the structural strength is higher; the present invention also provides a radio transceiver including the above dielectric filter.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to dielectric filters and radio transceiver equipment. Background Art

[0002] With the promotion of the Massive MIMO architecture of 5G base stations, dielectric filters have replaced traditional large-volume cavity filters and become the preferred filter solution for 5G base stations due to their small size, high performance, high reliability, low cost, and ease of mass production. At the same time, due to the shortage of spectrum resources, the out-of-band suppression requirements of filters are becoming increasingly higher. However, since dielectric filters are filled with dielectric materials, it is impossible to process flying rods similar to those used in traditional cavity filters to achieve negative coupling, which has an adverse effect on filter design, especially zero-point design.

[0003] At present, there are some design and processing methods for negative coupling of dielectric filters on the market. For example, international patent application WO2018148905 A1 discloses a dielectric filter that realizes capacitive coupling between resonant cavities by setting negative coupling holes and conductive isolation layers on a dielectric block. However, the processing technology of this patent is complicated, and it is necessary to use surface printing or laser etching and other processes to additionally set a conductive isolation layer. Another example is that Chinese invention patent CN104604022B discloses a dielectric filter that realizes capacitive coupling between resonators on both sides of a blind hole by drilling a blind hole on a body made of solid dielectric material. However, the blind hole requires precise control of the hole depth, which makes the performance of the dielectric filter unstable and requires a large amount of debugging. In addition, the negative coupling of this blind hole needs to be designed to be very deep, and its bottom thickness is very small, which reduces the overall structural strength of the filter. Summary of the invention

[0004] The object of the present invention is to overcome the disadvantages of the prior art and provide a dielectric filter with simple structure and stable performance, and a radio transceiver including the dielectric filter.

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

[0006] A negative coupling hole, which is a straight hole, is opened on the upper surface of the first dielectric resonator and extends downwardly obliquely until it passes through the lower surface of the second dielectric resonator, so that the upper opening of the negative coupling hole is entirely located on the upper surface of the first dielectric resonator body, and the lower opening of the negative coupling hole is entirely located on the lower surface of the second dielectric resonator body, the negative coupling hole connects the first dielectric resonator and the second dielectric resonator, and the negative coupling hole is used to achieve capacitive coupling between the first dielectric resonator and the second dielectric resonator;

[0007] A conductive layer covers the surface of the dielectric filter body, the inner wall surface of the debugging hole and the inner wall surface of the negative coupling hole.

[0008] Preferably, the opening of the negative coupling hole is connected to the opening of the debugging hole of the first dielectric resonator, so that the inner cavity of the negative coupling hole is connected to the inner cavity of the debugging hole of the first dielectric resonator.

[0009] Preferably, the debugging hole of the second dielectric resonator is located on the lower surface of the second dielectric resonator body, and the hole opening portion of the lower hole opening of the negative coupling hole is connected to the hole opening portion of the debugging hole of the second dielectric resonator, so that the inner cavity of the negative coupling hole is connected to the inner cavity of the debugging hole of the second dielectric resonator.

[0010] Preferably, the axis center line of the negative coupling hole is located on a virtual plane formed by the axis center line of the first dielectric resonator debugging hole and the axis center line of the second dielectric resonator debugging hole.

[0011] Preferably, the cross-section of the negative coupling hole is any one of circular, elliptical or polygonal.

[0012] Preferably, the dielectric filter further comprises a coupling slot, wherein the coupling slot is provided on the upper surface of the dielectric filter body and extends downwardly through the lower surface of the dielectric filter body, the coupling slot has openings on both the upper surface and the lower surface of the dielectric filter body, and the coupling slot also has an opening on the front surface or the rear surface of the dielectric filter body, the coupling slot is located at the connection position of the first dielectric resonator body and the second dielectric resonator body, the inner wall surface of the coupling slot is covered with the conductive layer, and the coupling slot and the negative coupling hole work together to realize capacitive coupling between the first dielectric resonator and the second dielectric resonator.

[0013] Further preferably, there are two coupling slots, and the two coupling slots are symmetrically distributed on both sides of a virtual plane formed by the axis center line of the first dielectric resonator debugging hole and the axis center line of the second dielectric resonator debugging hole.

[0014] To achieve the above object, the technical solution adopted by the present invention is: a dielectric filter, comprising at least two dielectric resonators, namely a first dielectric resonator and a second dielectric resonator, wherein the dielectric resonator comprises a dielectric resonator body made of ceramic material and a debugging hole located on the surface of the dielectric resonator body, wherein the debugging hole is a blind hole, and the debugging hole is used to debug the resonant frequency of the dielectric resonator in which it is located, wherein the debugging hole of the first dielectric resonator is located on the upper surface of the first dielectric resonator body, and the debugging hole of the second dielectric resonator is located on the lower surface of the second dielectric resonator body; all the dielectric resonator bodies constitute the dielectric filter body, and the dielectric filter further comprises:

[0015] A negative coupling hole, which is a straight hole, is opened on the upper surface of the second dielectric resonator and extends downwardly obliquely until it passes through the lower surface of the first dielectric resonator, so that the upper hole opening of the negative coupling hole is entirely located on the upper surface of the second dielectric resonator body, and the lower hole opening of the negative coupling hole is entirely located on the lower surface of the first dielectric resonator body, the negative coupling hole connects the first dielectric resonator and the second dielectric resonator, and the negative coupling hole is used to achieve capacitive coupling between the first dielectric resonator and the second dielectric resonator;

[0016] A conductive layer covers the surface of the dielectric filter body, the inner wall surface of the debugging hole and the inner wall surface of the negative coupling hole.

[0017] Preferably, the axis center line of the negative coupling hole is located on a virtual plane formed by the axis center line of the first dielectric resonator debugging hole and the axis center line of the second dielectric resonator debugging hole.

[0018] Preferably, an extension line of the axis center line of the negative coupling hole intersects with an extension line of the axis center line of the first dielectric resonator debugging hole or an extension line of the axis center line of the second dielectric resonator debugging hole.

[0019] Preferably, the cross-section of the negative coupling hole is any one of circular, elliptical or polygonal.

[0020] Preferably, the dielectric filter further comprises a coupling slot, wherein the coupling slot is provided on the upper surface of the dielectric filter body and extends downwardly through the lower surface of the dielectric filter body, the coupling slot has openings on both the upper surface and the lower surface of the dielectric filter body, and the coupling slot also has an opening on the front surface or the rear surface of the dielectric filter body, the coupling slot is located at the connection position of the first dielectric resonator body and the second dielectric resonator body, the inner wall surface of the coupling slot is covered with the conductive layer, and the coupling slot and the negative coupling hole work together to realize capacitive coupling between the first dielectric resonator and the second dielectric resonator.

[0021] Further preferably, there are two coupling slots, and the two coupling slots are symmetrically distributed on both sides of a virtual plane formed by the axis center line of the first dielectric resonator debugging hole and the axis center line of the second dielectric resonator debugging hole.

[0022] To achieve the above object, the technical solution adopted by the present invention is a radio transceiver device, comprising any one of the dielectric filters described above.

[0023] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0024] The dielectric filter provided by the present invention comprises at least two dielectric resonators, wherein the dielectric resonator comprises a dielectric resonator body made of ceramic material and a debugging hole located on the surface of the dielectric resonator body. A negative coupling hole is opened on the upper surface of one of the dielectric resonator bodies and extends downwardly and penetrates the lower surface of the other dielectric resonator body, so that the upper hole opening of the negative coupling hole is completely located on the upper surface of one of the dielectric resonator bodies, and the lower hole opening of the negative coupling hole is completely located on the lower surface of the other dielectric resonator body, so that the negative coupling hole connects the two dielectric resonators, and the capacitive coupling between the two dielectric resonators can be realized through the negative coupling hole, the partition ring is omitted, the structure is simpler, the processing steps are fewer, the hole depth does not need to be accurately controlled, the performance is more stable, and the structural strength is higher; the present invention also provides a radio transceiver including the above dielectric filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 It is a three-dimensional perspective schematic diagram of a dielectric filter embodiment 1 of the present invention.

[0027] Figure 2 for Figure 1 Schematic top view of .

[0028] Figure 3 for Figure 2 Cross-sectional view along the AA direction.

[0029] Figure 4 It is a three-dimensional perspective schematic diagram of Example 2 of the dielectric filter in the present invention.

[0030] Figure 5It is a three-dimensional perspective schematic diagram of Example 3 of the dielectric filter in the present invention.

[0031] Figure 6 It is a three-dimensional perspective schematic diagram of Example 4 of the dielectric filter in the present invention.

[0032] Figure 7 It is a three-dimensional perspective schematic diagram of Example 5 of the dielectric filter in the present invention.

[0033] Figure 8 It is a three-dimensional perspective schematic diagram of Example 6 of the dielectric filter in the present invention.

[0034] Fig. 9 It is a three-dimensional perspective schematic diagram of Example 7 of the dielectric filter in the present invention.

[0035] Fig.10 It is a three-dimensional perspective schematic diagram of Example 8 of the dielectric filter in the present invention.

[0036] Fig.11 It is a three-dimensional perspective schematic diagram of Example 9 of the dielectric filter in the present invention.

[0037] Fig.12 for Fig.11 Schematic top view of .

[0038] Fig.13 for Fig.12 Cross-sectional view along the BB direction.

[0039] Fig.14 It is a three-dimensional perspective schematic diagram of a dielectric filter embodiment 10 of the present invention.

[0040] Fig.15 for Fig.14 Schematic top view of .

[0041] Fig.16 for Fig.15 Cross-sectional view along CC direction.

[0042] Fig.17 It is a three-dimensional perspective schematic diagram of the dielectric filter embodiment 11 of the present invention.

[0043] Fig.18 for Fig.17 Schematic top view of .

[0044] Fig.19 for Fig.18 Cross-sectional view along the DD direction.

[0045] Fig. 20 It is a three-dimensional perspective schematic diagram of the dielectric filter embodiment 12 of the present invention.

[0046] Fig.21 for Fig. 20Schematic top view of .

[0047] Fig. 22 for Fig.21 Cross-sectional view along the EE direction.

[0048] Fig.23 This is a diagram of the electrical performance of dielectric filter embodiment 1 of the present invention.

[0049] Wherein: 100. dielectric filter; 101. dielectric filter body; 200. first dielectric resonator; 201. first dielectric resonator body; 202. first debugging hole; 2021. first debugging hole mouth; 300. second dielectric resonator; 301. second dielectric resonator body; 302. second debugging hole; 3021. second debugging hole mouth; 400. negative coupling hole; 401. upper hole mouth; 402. lower hole mouth; 500. conductive layer; 601. first coupling slot; 602. second coupling slot. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] 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.

[0053] Example 1

[0054] like Figure 1-3 As shown, the dielectric filter 100 provided by the present invention comprises a first dielectric resonator 200 and a second dielectric resonator 300. The first dielectric resonator 200 and the second dielectric resonator 300 are arranged adjacent to each other. The first dielectric resonator 200 comprises a first dielectric resonator body 201 made of a 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 and is used to debug the resonance frequency of the first dielectric resonator 200. The second dielectric resonator 300 comprises a second dielectric resonator body 301 made of a ceramic material and a second debugging hole 302 located on the lower surface of the second dielectric resonator body 301. The second debugging hole 302 is a blind hole and is used to debug the resonance frequency of the second dielectric resonator 300. The first dielectric resonator body 201 and the second dielectric resonator body 301 together constitute a dielectric filter body 101.

[0055] The first debugging hole 202 and the second debugging hole 302 are located on both sides of the interface between the first dielectric resonator 200 and the second dielectric resonator 300 , and the distances between the two debugging holes and the interface are equal.

[0056] The dielectric filter 100 further includes a negative coupling hole 400, which is a straight hole. The negative coupling hole 400 is opened on the upper surface of the first dielectric resonator body 201 and extends downwardly obliquely until it penetrates the lower surface of the second dielectric resonator body 301, so that the upper hole opening of the negative coupling hole 400 is completely located on the upper surface of the first dielectric resonator body 201, and the lower hole opening of the negative coupling hole 400 is completely located on the lower surface of the second dielectric resonator body 301; the negative coupling hole 400 has an upper hole opening portion 401 located on the upper surface of the first dielectric resonator 201 and a lower hole opening portion 402 located on the lower surface of the second dielectric resonator 301, and the cross section of the negative coupling hole 400 is circular. The negative coupling hole 400 connects the first dielectric resonator 200 and the second dielectric resonator 300, and the negative coupling hole 400 is used to achieve capacitive coupling between the first dielectric resonator 200 and the second dielectric resonator 300.

[0057] The dielectric filter 100 further includes a conductive layer 500 covering the surface of the dielectric filter body 101, the inner wall surface of the first debugging hole 202, the inner wall surface of the second debugging hole 302 and the inner wall surface of the negative coupling hole 400. The conductive layer 500 is made of silver.

[0058] The axis line of the first debugging hole 202 is parallel to the axis line of the second debugging hole 302. The axis line of the first debugging hole 202 and the axis line of the second debugging hole 302 form a virtual plane. The axis line of the negative coupling hole 400 is located on the plane, and the extension line of the axis line of the negative coupling hole 400 intersects with the extension line of the axis line of the first debugging hole 202 / the second debugging hole 302.

[0059] like Fig.23 As shown, the dielectric filter 100 generates a transmission zero point A in the low frequency band of the passband B of the dielectric filter 100 through the negative coupling hole 400; the strength of the transmission zero point A is adjusted by adjusting the angle between the axis of the negative coupling hole 400 and the lower surface of the dielectric filter body 101 and the cross-sectional area of ​​the negative coupling hole 400; the smaller the angle between the axis of the negative coupling hole 400 and the lower surface of the dielectric filter body 101, the stronger the transmission zero point A; the larger the cross-sectional area of ​​the negative coupling hole 400, the stronger the transmission zero point A.

[0060] Example 2

[0061] like Figure 4 As shown, Embodiment 2 is substantially the same as Embodiment 1, except that the cross section of the negative coupling hole 400 in Embodiment 2 is rectangular.

[0062] Example 3

[0063] like Figure 5 As shown, Example 3 is basically the same as Example 1, except that the upper hole opening portion 401 of the negative coupling hole 400 in Example 3 is connected to the hole opening portion 2021 of the first debugging hole 202 on the first dielectric resonator 200, so that the inner cavity of the negative coupling hole 400 is connected to the inner cavity of the first debugging hole 202, and the lower hole opening portion 402 of the negative coupling hole 400 is connected to the hole opening portion 3021 of the second debugging hole 302 on the second dielectric resonator 300, so that the inner cavity of the negative coupling hole 400 is connected to the inner cavity of the second debugging hole 302.

[0064] Example 4

[0065] like Figure 6 As shown, Embodiment 4 is substantially the same as Embodiment 3, except that the cross section of the negative coupling hole 400 in Embodiment 4 is rectangular.

[0066] Example 5

[0067] like Figure 7 As shown, Embodiment 5 is substantially the same as Embodiment 1, except that the second debugging hole 302 on the second dielectric resonator 300 in Embodiment 5 is located on the upper surface of the second dielectric resonator 301 .

[0068] Example 6

[0069] like Figure 8 As shown, Embodiment 6 is substantially the same as Embodiment 5, except that the cross section of the negative coupling hole 400 in Embodiment 6 is rectangular.

[0070] Example 7

[0071] like Fig. 9 As shown, Example 7 is basically the same as Example 5, except that the upper hole mouth portion 401 of the negative coupling hole 400 in Example 7 is connected to the hole mouth portion 2021 of the first debugging hole 202 on the first dielectric resonator 200, so that the inner cavity of the negative coupling hole 400 is connected to the inner cavity of the first debugging hole 202.

[0072] Example 8

[0073] like Fig.10 As shown, Embodiment 8 is substantially the same as Embodiment 7, except that the cross section of the negative coupling hole 400 in Embodiment 8 is rectangular.

[0074] Example 9

[0075] like Figure 11-13 As shown, Example 9 is basically the same as Example 5, except for two points. The first point of difference is that the second debugging hole 302 on the second dielectric resonator 300 in Example 9 is located on the upper surface of the second dielectric resonator 301 .

[0076] The second difference is that the dielectric filter 100 in Example 9 further includes a first coupling slot 601 and a second coupling slot 602. The first coupling slot 601 is opened on the upper surface of the dielectric filter body 101 and extends vertically downward through the lower surface of the dielectric filter body 101. The first coupling slot 601 has openings on both the upper surface and the lower surface of the dielectric filter body 101. The first coupling slot 601 also has an opening on the rear surface of the dielectric filter body 101. The first coupling slot 601 is located at the connection position between the first dielectric resonator body 201 and the second dielectric resonator body 202. The inner wall surface of the first coupling slot 601 is covered with a conductive layer 500. The second coupling slot 601 is provided with a conductive layer 500. 02 is opened on the upper surface of the dielectric filter body 101 and extends vertically downward through the lower surface of the dielectric filter body 101. The second coupling slot 602 has openings on both the upper surface and the lower surface of the dielectric filter body 101. The second coupling slot 602 also has an opening on the front surface of the dielectric filter body 101. The second coupling slot 602 is located at the connection position of the first dielectric resonator body 201 and the second dielectric resonator body 202. The inner wall surface of the second coupling slot 602 is covered with a conductive layer 500. The first coupling slot 601 and the second coupling slot 602 are symmetrically distributed on both sides of the virtual plane formed by the axis line of the first debugging hole 202 and the axis line of the second debugging hole 302.

[0077] The electrical performance of Example 9 is substantially the same as that of Example 1, except that, in Example 9, the capacitive coupling between the first dielectric resonator 200 and the second dielectric resonator 300 is achieved through the joint action of the first coupling slot 601, the second coupling slot 602 and the negative coupling hole 400, wherein the negative coupling hole 400 is used to perform a main adjustment on the capacitive coupling, and the first coupling slot 601 and the second coupling slot 602 are used to perform a fine adjustment on the capacitive coupling. The adjustment method of the negative coupling hole 400 is exactly the same as that of Example 1, and the adjustment method of the first coupling slot 601 and the second coupling slot 602 is that the deeper the slot depth of the first coupling slot 601 and the second coupling slot 602 in the front-to-back direction, the stronger the transmission zero point A.

[0078] Example 10

[0079] like Figure 14-16 As shown, Example 10 is basically the same as Example 1, except for two points. The first point is that the upper hole opening 401 of the negative coupling hole 400 in Example 10 is connected with the hole opening 2021 of the first debugging hole 202 on the first dielectric resonator 200, so that the inner cavity of the negative coupling hole 400 is connected with the inner cavity of the first debugging hole 202, and the lower hole opening 402 of the negative coupling hole 400 is connected with the hole opening 3021 of the second debugging hole 302 on the second dielectric resonator 300, so that the inner cavity of the negative coupling hole 400 is connected with the inner cavity of the second debugging hole 302.

[0080] The second difference is that the dielectric filter 100 in the embodiment 10 further includes a first coupling slot 601 and a second coupling slot 602. The first coupling slot 601 is provided on the upper surface of the dielectric filter body 101 and vertically extends downward through the lower surface of the dielectric filter body 101. The first coupling slot 601 has openings on both the upper surface and the lower surface of the dielectric filter body 101. The first coupling slot 601 also has an opening on the rear surface of the dielectric filter body 101. The first coupling slot 601 is located at the connection position between the first dielectric resonator body 201 and the second dielectric resonator body 202. The inner wall surface of the first coupling slot 601 is covered with a conductive layer 500. The second coupling slot 601 is provided at the upper surface and the lower surface of the dielectric filter body 101. 02 is opened on the upper surface of the dielectric filter body 101 and extends vertically downward through the lower surface of the dielectric filter body 101. The second coupling slot 602 has openings on both the upper surface and the lower surface of the dielectric filter body 101. The second coupling slot 602 also has an opening on the front surface of the dielectric filter body 101. The second coupling slot 602 is located at the connection position of the first dielectric resonator body 201 and the second dielectric resonator body 202. The inner wall surface of the second coupling slot 602 is covered with a conductive layer 500. The first coupling slot 601 and the second coupling slot 602 are symmetrically distributed on both sides of the virtual plane formed by the axis line of the first debugging hole 202 and the axis line of the second debugging hole 302.

[0081] The electrical performance of Example 10 is substantially the same as that of Example 1, except that, in Example 10, the capacitive coupling between the first dielectric resonator 200 and the second dielectric resonator 300 is realized by the first coupling slot 601, the second coupling slot 602 and the negative coupling hole 400 acting together, wherein the negative coupling hole 400 is used to perform a main adjustment on the capacitive coupling, and the first coupling slot 601 and the second coupling slot 602 are used to perform a fine adjustment on the capacitive coupling. The adjustment method of the negative coupling hole 400 is exactly the same as that of Example 1, and the adjustment method of the first coupling slot 601 and the second coupling slot 602 is that the deeper the slot depth of the first coupling slot 601 and the second coupling slot 602 in the front-to-back direction, the stronger the transmission zero point A.

[0082] Embodiment 11

[0083] like Figure 17-19 As shown, Example 11 is basically the same as Example 1, except for three points. The first point is that the negative coupling hole 400 in Example 11 is opened on the upper surface of the second dielectric resonator body 301 and extends downwardly obliquely until it penetrates the lower surface of the first dielectric resonator body 201, so that the upper opening of the negative coupling hole 400 is entirely located on the upper surface of the second dielectric resonator body 301, and the lower opening of the negative coupling hole 400 is entirely located on the lower surface of the first dielectric resonator body 201; the negative coupling hole 400 has an upper opening portion 401 located on the upper surface of the second dielectric resonator 301 and a lower opening portion 402 located on the lower surface of the first dielectric resonator 201.

[0084] The second difference is that the cross section of the negative coupling hole 400 in Embodiment 11 is rectangular.

[0085] The third difference is that the dielectric filter 100 in the embodiment 11 further includes a first coupling slot 601 and a second coupling slot 602. The first coupling slot 601 is opened on the upper surface of the dielectric filter body 101 and extends vertically downward through the lower surface of the dielectric filter body 101. The first coupling slot 601 has openings on both the upper surface and the lower surface of the dielectric filter body 101. The first coupling slot 601 also has an opening on the rear surface of the dielectric filter body 101. The first coupling slot 601 is located at the connection position between the first dielectric resonator body 201 and the second dielectric resonator body 202. The inner wall surface of the first coupling slot 601 is covered with a conductive layer 500. The second coupling slot 601 is provided with a conductive layer 500. 02 is opened on the upper surface of the dielectric filter body 101 and extends vertically downward through the lower surface of the dielectric filter body 101. The second coupling slot 602 has openings on both the upper surface and the lower surface of the dielectric filter body 101. The second coupling slot 602 also has an opening on the front surface of the dielectric filter body 101. The second coupling slot 602 is located at the connection position of the first dielectric resonator body 201 and the second dielectric resonator body 202. The inner wall surface of the second coupling slot 602 is covered with a conductive layer 500. The first coupling slot 601 and the second coupling slot 602 are symmetrically distributed on both sides of the virtual plane formed by the axis line of the first debugging hole 202 and the axis line of the second debugging hole 302.

[0086] The electrical performance of Example 11 is substantially the same as that of Example 1, except that, in Example 11, the capacitive coupling between the first dielectric resonator 200 and the second dielectric resonator 300 is realized by the first coupling slot 601, the second coupling slot 602 and the negative coupling hole 400 acting together, wherein the negative coupling hole 400 is used to perform a main adjustment on the capacitive coupling, and the first coupling slot 601 and the second coupling slot 602 are used to perform a fine adjustment on the capacitive coupling. The adjustment method of the negative coupling hole 400 is exactly the same as that of Example 1, and the adjustment method of the first coupling slot 601 and the second coupling slot 602 is that the deeper the slot depth of the first coupling slot 601 and the second coupling slot 602 in the front-to-back direction, the stronger the transmission zero point A.

[0087] Example 12

[0088] like Figure 20-22 As shown, Example 12 is substantially the same as Example 11, except that the cross section of the negative coupling hole 400 in Example 12 is circular.

[0089] The dielectric filter provided by the present invention comprises at least two dielectric resonators, wherein the dielectric resonator comprises a dielectric resonator body made of ceramic material and a debugging hole located on the surface of the dielectric resonator body. A negative coupling hole is provided on the upper surface of one of the dielectric resonator bodies and extends downwardly obliquely until it passes through the lower surface of the other dielectric resonator body, so that the upper hole opening of the negative coupling hole is completely located on the upper surface of one of the dielectric resonator bodies, and the lower hole opening of the negative coupling hole is completely located on the lower surface of the other dielectric resonator body, so that the negative coupling hole connects the two dielectric resonators, and capacitive coupling between the two dielectric resonators can be achieved through the negative coupling hole, a partition ring is omitted, the structure is simpler, the processing steps are fewer, there is no need to accurately control the hole depth, the performance is more stable, and the structural strength is higher.

[0090] The present invention further provides a transceiver device, which includes any one of the dielectric filters in the above embodiments. The dielectric filter in the transceiver device can be used to filter radio frequency signals.

[0091] 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.

[0092] 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, wherein the first dielectric resonator comprises a first dielectric resonator body made of a ceramic material and a first debugging hole located on the surface of the first dielectric resonator body, wherein the first debugging hole is a blind hole and is used to debug the resonance frequency of the first dielectric resonator in which the first dielectric resonator is located, and the second dielectric resonator comprises a second dielectric resonator body made of a ceramic material and a second debugging hole located on the surface of the second dielectric resonator body, wherein the second debugging hole is a blind hole and is used to debug the resonance frequency of the second dielectric resonator in which the second dielectric resonator is located, and all dielectric resonator bodies constitute a dielectric filter body, and the dielectric filter further comprises: A negative coupling hole, which is a straight hole, is opened on the upper surface of the first dielectric resonator and extends downwardly obliquely until it passes through the lower surface of the second dielectric resonator, so that the upper opening of the negative coupling hole is entirely located on the upper surface of the first dielectric resonator body, and the lower opening of the negative coupling hole is entirely located on the lower surface of the second dielectric resonator body, and the negative coupling hole connects the first dielectric resonator and the second dielectric resonator; A conductive layer covering the surface of the dielectric filter body, the inner wall surface of the first debugging hole, the inner wall surface of the second debugging hole and the inner wall surface of the negative coupling hole; Features: The first debugging hole of the first dielectric resonator is located on the upper surface of the first dielectric resonator body, and the hole opening of the upper hole opening of the negative coupling hole is connected to the hole opening of the first debugging hole of the first dielectric resonator, so that the inner cavity of the negative coupling hole is connected to the inner cavity of the first debugging hole of the first dielectric resonator; the second debugging hole of the second dielectric resonator is located on the lower surface of the second dielectric resonator body, and the hole opening of the lower hole opening of the negative coupling hole is connected to the hole opening of the second debugging hole of the second dielectric resonator, so that the inner cavity of the negative coupling hole is connected to the inner cavity of the second debugging hole of the second dielectric resonator; the negative coupling hole 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 negative coupling hole is located on a virtual plane formed by the axis center line of the first dielectric resonator debugging hole and the axis center line of the second dielectric resonator debugging hole.

3. The dielectric filter according to claim 1, characterized in that The cross section of the negative coupling hole is any one of a circular shape, an elliptical shape or a polygonal shape.

4. The dielectric filter according to claim 1, characterized in that: The dielectric filter further comprises a coupling slot, which is provided on the upper surface of the dielectric filter body and extends downwardly through the lower surface of the dielectric filter body, the coupling slot has openings on both the upper surface and the lower surface of the dielectric filter body, and the coupling slot also has an opening on the front surface or the rear surface of the dielectric filter body, the coupling slot is located at the connection position of the first dielectric resonator body and the second dielectric resonator body, the inner wall surface of the coupling slot is covered with the conductive layer, and the coupling slot and the negative coupling hole work together to realize capacitive coupling between the first dielectric resonator and the second dielectric resonator.

5. The dielectric filter according to claim 4, characterized in that: There are two coupling slots, which are symmetrically distributed on both sides of a virtual plane formed by the axis of the first dielectric resonator debugging hole and the axis of the second dielectric resonator debugging hole.

6. A radio transceiver device, characterized in that: The invention comprises the dielectric filter according to any one of claims 1 to 5.

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