阅读说明：本技术 新型的介质滤波器耦合结构 (Novel dielectric filter coupling structure ) 是由 徐华 于 2019-10-29 设计创作，主要内容包括：本发明公开一种新型的介质滤波器耦合结构,包括介质滤波器本体、第一盲孔和第二盲孔,所述第一盲孔和第二盲孔设置于介质滤波器本体的同侧,所述第一盲孔和第二盲孔与介质滤波器本体上的介质形成两个介质谐振器,所述两个介质谐振器之间设有一负耦合孔,所述负耦合孔与第一调试孔和第二调试孔的开口位于介质滤波器本体同一表面,所述负耦合孔一端贯穿介质滤波器本体,另一端为封闭端,所述负耦合孔内设有一凸台,所述凸台与介质滤波器本体为一体结构,所述负耦合孔内壁与凸台外壁设有连续的导电层。本发明可以在实现电容耦合的同时,实现了对于远端寄生通带频率的控制。(The invention discloses a novel dielectric filter coupling structure, which comprises a dielectric filter body, a first blind hole and a second blind hole, wherein the first blind hole and the second blind hole are arranged at the same side of the dielectric filter body, the first blind hole and the second blind hole and a medium on the dielectric filter body form two dielectric resonators, a negative coupling hole is arranged between the two dielectric resonators, the openings of the negative coupling hole, the first debugging hole and the second debugging hole are positioned on the same surface of the dielectric filter body, one end of the negative coupling hole penetrates through the dielectric filter body, the other end of the negative coupling hole is a closed end, a boss is arranged in the negative coupling hole, the boss and the dielectric filter body are of an integral structure, and continuous conducting layers are arranged on the inner wall of the negative coupling hole and the outer wall of the boss. The invention can realize the control of the frequency of the far-end parasitic passband while realizing the capacitive coupling.)

1. A novel dielectric filter coupling structure is characterized in that: comprises a dielectric filter body (1), a first blind hole (2) and a second blind hole (3), the first blind hole (2) and the second blind hole (3) are arranged at the same side of the dielectric filter body (1), the first blind hole (2) and the second blind hole (3) and the medium on the dielectric filter body (1) form two dielectric resonators, a negative coupling hole (4) is arranged between the two dielectric resonators, the negative coupling hole (4) and the openings of the first debugging hole (2) and the second debugging hole (3) are positioned on the same surface of the dielectric filter body (1), one end of the negative coupling hole (4) penetrates through the dielectric filter body (1), the other end is a closed end, a boss (5) is arranged in the negative coupling hole (4), the boss (5) and the dielectric filter body (1) are of an integral structure, and continuous conducting layers are arranged on the inner wall of the negative coupling hole (4) and the outer wall of the boss (5).

2. The novel dielectric filter coupling structure of claim 1, wherein: the negative coupling hole (4) and the boss (5) are of a coaxial structure.

3. The novel dielectric filter coupling structure of claim 1, wherein: and the surface of the dielectric filter body (1) is provided with a conducting layer which is connected with the conducting layer on the inner wall of the negative coupling hole (4).

4. The novel dielectric filter coupling structure of claim 1, wherein: and the inner walls of the first blind hole (2) and the second blind hole (3) are provided with conducting layers which are connected with the conducting layers on the inner walls of the negative coupling holes (4).

5. The novel dielectric filter coupling structure of claim 1, wherein the depth of the negative coupling hole (4) is 1.1 ~ 1.2.2 times the depth of the first blind hole (2).

6. The novel dielectric filter coupling structure of claim 1, wherein: the inner diameter of the negative coupling hole (4) is larger than the inner diameters of the first blind hole (2) and the second blind hole (3).

7. The novel dielectric filter coupling structure of claim 1, wherein the diameter of the boss (5) is about 1/3 ~ 1/2 of the negative coupling hole (4).

Technical Field

The invention relates to a novel dielectric filter coupling structure, and belongs to the technical field of communication.

Background

With the increasing development of wireless communication technology, wireless communication base stations are distributed more and more densely, the volume requirement of the base stations is smaller and smaller, wherein the volume ratio of a radio frequency front-end filter module in the base stations is larger, and therefore the volume requirement of the filter is smaller and smaller. However, when the volume of the metal coaxial cavity filter is reduced, it is found that: the smaller the filter volume, the higher the surface current, the higher the losses and the lower the power carrying capacity, i.e. the smaller the power capacity. That is, as the volume of the metal coaxial cavity filter is reduced, its performance index is deteriorated. At present, a miniaturized filter, that is, a solid dielectric filter is widely used, but a structure for realizing capacitive coupling (or called negative coupling) in the solid dielectric filter is complex, the process realization difficulty is high, and a parasitic passband is easily generated at a frequency close to the passband, so that how to provide a dielectric filter with a simple structure and low process difficulty becomes a research direction of a person skilled in the art.

Disclosure of Invention

The invention aims to provide a novel dielectric filter coupling structure which can realize capacitive coupling and control of far-end parasitic passband frequency.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a novel dielectric filter coupled structure, includes dielectric filter body, first blind hole and second blind hole set up in the homonymy of dielectric filter body, medium on first blind hole and the dielectric filter body of second blind hole and the dielectric filter forms two dielectric resonator, be equipped with a burden coupling hole between two dielectric resonator, the opening in burden coupling hole and first debugging hole and second debugging hole is located the same surface of dielectric filter body, burden coupling hole one end runs through the dielectric filter body, and the other end is the blind end, the downthehole boss that is equipped with of burden coupling, boss and dielectric filter body structure as an organic whole, burden coupling hole inner wall is equipped with continuous conducting layer with the boss outer wall.

The further improved scheme in the technical scheme is as follows:

1. in the above scheme, the negative coupling hole and the boss are of a coaxial structure.

2. In the above scheme, the surface of the dielectric filter body is provided with the conductive layer which is connected with the conductive layer on the inner wall of the negative coupling hole.

3. In the above scheme, the inner walls of the first blind hole and the second blind hole are provided with conducting layers which are connected with the conducting layers on the inner walls of the negative coupling holes.

4. In the scheme, the depth of the negative coupling hole is 1.1 ~ 1.2.2 times of the depth of the first blind hole.

5. In the above scheme, the inner diameter of the negative coupling hole is larger than the inner diameters of the first blind hole and the second blind hole.

6. In the above solution, the boss diameter is about 1/3 ~ 1/2 of the negative coupling hole.

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

1. the dielectric filter coupling structure realizes capacitive coupling, realizes control on the frequency of a far-end parasitic passband, and can avoid harmonic waves generated at the low end of the passband.

2. The invention relates to a dielectric filter coupling structure, wherein a negative coupling hole is arranged between two dielectric resonators, the negative coupling hole and openings of a first debugging hole and a second debugging hole are positioned on the same surface of a dielectric filter body, one end of the negative coupling hole penetrates through the dielectric filter body, the other end of the negative coupling hole is a closed end, a boss is arranged in the negative coupling hole, the boss and the dielectric filter body are of an integral structure, continuous conducting layers are arranged on the inner wall of the negative coupling hole and the outer wall of the boss, the strength of negative coupling is controlled by adjusting the diameter and the height of the boss, the diameter of the boss is 1/3 ~ 1/2 of the negative coupling hole, the boss can be determined according to process realization and required coupling, the height of the boss is about 10% ~ 100% of the depth of the coupling hole, generally speaking, the height of the boss in the inner part is higher, the larger the diameter can form larger loading capacitance, and the local electric field strength is stronger.

Drawings

Fig. 1 is a schematic diagram of a coupling structure of a dielectric filter according to the present invention.

In the above drawings: 1. a dielectric filter body; 2. a first blind hole; 3. a second blind hole; 4. a negative coupling aperture; 5. and (4) a boss.

Detailed Description

In the description of this patent, it is 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 the drawings, and are only for convenience in describing the present invention and simplifying the 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; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; 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 meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.