阅读说明：本技术 一种介质滤波器及包括该介质滤波器的无线电收发设备 (Dielectric filter and radio transceiver device including the same ) 是由 朱琦 周鑫童 于 2020-05-06 设计创作，主要内容包括：本发明提供的介质滤波器,通过负耦合槽和隔断环共同作用实现电容耦合,通过将负耦合槽设置在介质滤波器本体的上表面,使负耦合槽在介质滤波器本体的上表面和前表面均具有开口,在陶瓷材料高温烧结时负耦合槽的形状和精度变化小,对介质滤波器电气性能的影响小,通过在介质滤波器本体的下表面设置隔断环,并使隔断环位于负耦合槽的正下方,能够通过隔断环对上述影响进行弥补,使得介质滤波器的电气性能更加稳定,良品率高,并且,由于隔断环的存在,使得负耦合槽的深度无需过深,使得负耦合槽的容积在整个介质滤波器内的占比较小,使得介质滤波器的结构强度更好,本发明还提供一种包括上述介质滤波器的无线电收发设备。(The dielectric filter provided by the invention realizes capacitive coupling through the combined action of the negative coupling groove and the partition ring, the negative coupling groove is arranged on the upper surface of the dielectric filter body, the negative coupling groove is provided with openings on the upper surface and the front surface of the dielectric filter body, the shape and precision change of the negative coupling groove is small when ceramic materials are sintered at high temperature, the influence on the electrical performance of the dielectric filter is small, the partition ring is arranged on the lower surface of the dielectric filter body and is positioned right below the negative coupling groove, the influence can be compensated through the partition ring, the electrical performance of the dielectric filter is more stable, the yield is high, and the depth of the negative coupling groove does not need to be too deep due to the existence of the partition ring, the occupation ratio of the volume of the negative coupling groove in the whole dielectric filter is smaller, and the structural strength of the dielectric filter is better, the invention also provides a radio transceiver device comprising the dielectric filter.)

1. A dielectric filter is characterized by comprising at least two dielectric resonators, wherein each dielectric resonator comprises a dielectric resonator body made of ceramic materials and a debugging hole positioned on the upper surface of the dielectric resonator body, the debugging hole is a blind hole, and the debugging hole is used for debugging the resonance frequency of the dielectric resonator in which the debugging hole is positioned; all the dielectric resonator bodies constitute a dielectric filter body, and the dielectric filter further includes:

the negative coupling groove is positioned on the upper surface of the dielectric filter body and positioned at the connecting position of two adjacent dielectric resonators, the negative coupling groove is a blind groove, the upper surface of the dielectric filter body is provided with an opening, and the front surface of the dielectric filter body is also provided with an opening;

the conducting layer covers the surface of the dielectric filter body, the surface of the inner wall of the debugging hole and the surface of the inner wall of the negative coupling groove;

non-closed cuts off the ring, cut off the ring and be located the lower surface of dielectric filter body, and be located under the negative coupling groove, cut off the ring including being close to cut off the interior border at ring center, keep away from cut off the outer border at ring center, connect the interior border with the tip border at outer border, the interior border the outer border with the region that the tip border encloses exposes the dielectric filter body, the negative coupling groove with cut off the ring combined action and realize capacitive coupling between two adjacent dielectric resonators.

2. The dielectric filter according to claim 1, wherein the negative coupling groove is a stepped blind groove formed by communicating a shallow blind groove and a deep blind groove, the shallow blind groove has an opening only on an upper surface of the dielectric filter body, the deep blind groove has openings on both the upper surface and a front surface of the dielectric filter body, and a groove depth of the shallow blind groove in a vertical direction is smaller than a groove depth of the deep blind groove in a vertical direction.

3. The dielectric filter of claim 1, wherein a projection area of the negative coupling groove on the lower surface of the dielectric filter body intersects with an area where the partition ring is located, and the area where the partition ring is located is an area surrounded by the inner edge, the outer edge, and the end edge.

4. The dielectric filter of claim 1, wherein a region enclosed by the inner edge, the outer edge, and the end edge has any one of a C-shape, a U-shape, or a polygon having a single opening.

5. The dielectric filter of claim 4, wherein a region enclosed by the inner edge, the outer edge and the end edge is C-shaped, the inner edge and the outer edge are circular arcs, and the radian of the inner edge and/or the outer edge is greater than or equal to 300 °.

6. The dielectric filter of claim 5, wherein the diameter of the circle on which the inner edge and/or the outer edge is located is greater than or equal to the groove width of the negative coupling groove in the left-right direction.

7. The dielectric filter of claim 4, wherein the region defined by the inner edge, the outer edge and the end edge is U-shaped, and the partition ring has two transmission sections perpendicular to the front surface of the dielectric filter body and a connection section connecting the two transmission sections.

8. The dielectric filter of claim 7, wherein the distance between the two transmission segments is greater than or equal to the slot width of the negative coupling slot in the left-right direction.

9. The dielectric filter of claim 7, wherein the connecting section is parallel to a front surface of the dielectric filter body.

10. Radio transceiver device, characterized in that it comprises a dielectric filter according to any of claims 1 to 9.

Technical Field

The invention relates to the field of electronic communication equipment, in particular to a dielectric filter and radio transceiver equipment comprising the dielectric filter.

Background

With the advent of the "explosion" era of 5G communication, 5G base stations are gradually becoming widespread worldwide, and filters are key components in communication base stations that determine the anti-interference characteristics of the base stations. A traditional 4G base station is made of an aluminum cavity filter into a large-size cavity filter, and the large-size cavity filter cannot be applied on a large scale under the framework of 5G base station Massive MIMO due to the defects of size, weight, cost and the like. The dielectric filter is a preferred scheme of the filter for the 5G base station by virtue of the characteristics of small volume, low loss, low cost, high reliability and the like. At the same working frequency, the dielectric filter can compress the total filter volume and weight to one tenth of the traditional cavity filter by virtue of the volume compression effect brought by high dielectric constant, and simultaneously maintains better performance. With the occupation of radio frequency spectrum resources and the improvement of the performance requirement of the base station, strict requirements are put forward on the out-of-band rejection index of the filter. The current scheme in the industry is that a cross-coupling structure is adopted to construct a transmission zero out of a filter band, so that the rectangular coefficient of the filter is improved, and the suppression degree of out-of-band spurs is increased.

When the filter constructs the cross-coupling transmission zero point, negative coupling is usually needed to turn the transmission phase of the filter, for example, chinese patent application CN110444849A discloses a dielectric filter with a long blind slot negative coupling structure, in order to meet some specific electrical performance requirements, for example, when the relative bandwidth of the filter is about 5%, the depth of the blind slot negative coupling needs to be designed very deep, and the ratio of the slot depth to the total height of the filter reaches about 95%; meanwhile, the length of the blind groove is long, and the shape and precision of the blind groove are greatly changed when the ceramic material is sintered at high temperature, so that the shape and precision of the negative coupling structure of the dielectric filter are greatly changed, the electrical performance of the dielectric filter is influenced, and the yield is low; meanwhile, the structure strength of the dielectric filter is greatly reduced due to the deep blind grooves, and the dielectric filter is easy to crack and has low reliability.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a dielectric filter for realizing capacitive coupling through the combined action of a negative coupling groove and a partition ring, wherein the negative coupling groove has small shape and precision change when a ceramic material is sintered at high temperature, the influence on the electrical performance of the dielectric filter is small, and the influence can be compensated through the partition ring, so that the dielectric filter has more stable electrical performance, high yield and better structural strength.

In order to achieve the above object, the present invention adopts a technical scheme that a dielectric filter comprises at least two dielectric resonators, each dielectric resonator comprises a dielectric resonator body made of a ceramic material and a debugging hole located on the upper surface of the dielectric resonator body, the debugging hole is a blind hole, and the debugging hole is used for debugging the resonance frequency of the dielectric resonator in which the debugging hole is located; all the dielectric resonator bodies constitute a dielectric filter body, and the dielectric filter further includes:

the negative coupling groove is positioned on the upper surface of the dielectric filter body and positioned at the connecting position of two adjacent dielectric resonators, the negative coupling groove is a blind groove, the upper surface of the dielectric filter body is provided with an opening, and the front surface of the dielectric filter body is also provided with an opening;

the conducting layer covers the surface of the dielectric filter body, the surface of the inner wall of the debugging hole and the surface of the inner wall of the negative coupling groove;

separate the broken ring, separate the ring and be located the lower surface of dielectric filter body, and be located under the negative coupling groove, separate the broken ring including being close to separate the interior border at ring center, keep away from separate the outer border at ring center, connect the interior border with the tip border at outer border, the interior border the outer border with the region that the tip border encloses exposes the dielectric filter body, the negative coupling groove with it realizes to separate ring combined action capacitive coupling between two adjacent dielectric resonators.

Preferably, the negative coupling groove is a stepped blind groove formed by communicating a shallow blind groove and a deep blind groove, the shallow blind groove has an opening only on the upper surface of the dielectric filter body, the deep blind groove has openings on both the upper surface and the front surface of the dielectric filter body, and the groove depth of the shallow blind groove in the up-down direction is smaller than the groove depth of the deep blind groove in the up-down direction.

Preferably, a projection region of the negative coupling groove on the lower surface of the dielectric filter body intersects with a region where the partition ring is located, where the region where the partition ring is located is a region surrounded by the inner edge, the outer edge, and the end edge.

Preferably, the area enclosed by the inner edge, the outer edge and the end edge is any one of a C shape, a U shape or a polygon with a single opening.

Further preferably, the region enclosed by the inner edge, the outer edge and the end edge is C-shaped, the inner edge and the outer edge are both arcs, and the radian of the inner edge and/or the outer edge is greater than or equal to 300 °.

Further preferably, the diameter of the circle on which the inner edge and/or the outer edge is located is greater than or equal to the groove width of the negative coupling groove in the left-right direction.

Further preferably, an area surrounded by the inner edge, the outer edge, and the end edge is U-shaped, and the partition ring has two transmission sections perpendicular to the front surface of the dielectric filter body and a connection section connecting the two transmission sections.

Further preferably, the distance between the two transmission sections is greater than or equal to the groove width of the negative coupling groove in the left-right direction.

Further preferably, the connecting section is parallel to the front surface of the dielectric filter body.

In order to achieve the above object, the present invention further includes a radio transceiver device, where the radio transceiver device includes any one of the dielectric filters described above.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

the dielectric filter provided by the invention realizes capacitive coupling through the combined action of the negative coupling groove and the partition ring, the negative coupling groove is arranged on the upper surface of the dielectric filter body, so that the negative coupling groove is provided with openings on the upper surface and the front surface of the dielectric filter body, the shape and precision of the negative coupling groove are changed little when the ceramic material is sintered at high temperature, and the influence on the electrical performance of the dielectric filter is little, the partition ring is arranged on the lower surface of the dielectric filter body and is positioned right below the negative coupling groove, the influence on the electrical performance of the dielectric filter caused by the shape and precision of the negative coupling groove can be compensated through the partition ring, the electrical performance of the dielectric filter is more stable, the yield is high, and the volume of the negative coupling groove occupies a smaller ratio in the whole dielectric filter because the depth of the existence of the partition ring, the depth of the negative coupling groove does not need to be too deep, the invention makes the structure strength of the dielectric filter better, and also provides a radio transceiver device comprising the dielectric filter.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a perspective view schematically illustrating a dielectric filter according to embodiment 1 of the present invention.

Fig. 2 is a schematic top view of fig. 1.

Fig. 3 is a schematic bottom view of fig. 1.

Fig. 4 is a sectional view taken along the line a-a in fig. 2.

Fig. 5 is a partially enlarged view of B in fig. 4.

Fig. 6 is a perspective view schematically illustrating embodiment 2 of the dielectric filter according to the present invention.

Fig. 7 is a perspective view schematically illustrating a dielectric filter according to embodiment 3 of the present invention.

Fig. 8 is a perspective view schematically illustrating a dielectric filter according to embodiment 4 of the present invention.

Fig. 9 is an electrical characteristic diagram of the dielectric filter of example 1 of the present invention.

Wherein: 100. a dielectric filter; 101. a dielectric filter body; 200. a first dielectric resonator; 201. a first dielectric resonator body; 202. a first pilot hole; 300. a second dielectric resonator; 301. a second dielectric resonator body; 302. a second pilot hole; 400. a negative coupling groove; 401. a deep blind groove; 402. shallow blind grooves; 500. a conductive layer; 600. a blocking ring; 601. an inner edge; 602. an outer edge; 603. an end edge; 604. a transmission section; 605. a connecting section; 606. and (4) opening.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 1, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.