阅读说明：本技术 包含电容耦合结构的介质滤波器 (Dielectric filter comprising a capacitive coupling structure ) 是由 徐华 于 2019-10-29 设计创作，主要内容包括：本发明公开一种包含电容耦合结构的介质滤波器,包括介质滤波器本体、第一调试孔和第二调试孔,所述第一调试孔和第二调试孔为设置于介质滤波器本体上的两盲孔,所述第一调试孔和第二调试孔与介质滤波器本体上的介质形成两个介质谐振器,所述第一调试孔和第二调试孔之间设有一负耦合孔,所述负耦合孔是由同心的一通孔和一盲孔组成的台阶孔,所述通孔一端贯穿介质滤波器本体,该通孔的此端开口方向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,所述通孔的另一端与盲孔连接,所述盲孔远离通孔的一端为封闭端。本发明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 dielectric filter comprising a capacitive coupling structure, which comprises a dielectric filter body, a first debugging hole and a second debugging hole, wherein the first debugging hole and the second debugging hole are two blind holes arranged on the dielectric filter body, the first debugging hole and the second debugging hole and a medium on the dielectric filter body form two dielectric resonators, a negative coupling hole is arranged between the first debugging hole and the second debugging hole, the negative coupling hole is a step hole formed by a concentric through hole and a blind hole, one end of the through hole penetrates through the dielectric filter body, the opening direction of the end of the through hole and the openings of the first debugging hole and the second debugging hole are positioned on the same surface of the dielectric filter body, the other end of the through hole is connected with the blind hole, and the end of the blind hole far away from the through hole is a closed end. The invention realizes the control of the frequency of the far-end parasitic passband while realizing the capacitive coupling.)

1. A dielectric filter comprising a capacitive coupling structure, characterized in that: the dielectric filter comprises a dielectric filter body (1), a first debugging hole (2) and a second debugging hole (3), wherein the first debugging hole (2) and the second debugging hole (3) are two blind holes arranged on the dielectric filter body (1), the first debugging hole (2) and the second debugging hole (3) and a medium on the dielectric filter body (1) form two dielectric resonators, a negative coupling hole (4) is arranged between the first debugging hole (2) and the second debugging hole (3), the negative coupling hole (4) is a stepped hole formed by a concentric through hole (401) and a concentric blind hole (402), one end of the through hole (401) penetrates through the dielectric filter body (1), the opening direction of the end of the through hole (401) 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), and the other end of the through hole (401) is connected with the blind hole (402), the blind hole (402) is far away from one end of the through hole (401) and is a closed end, and the inner walls of the through hole (401) and the blind hole (402) and the connecting steps of the through hole (401) and the blind hole (402) are provided with conducting layers.

2. A dielectric filter comprising a capacitive coupling structure according to claim 1, wherein: the dielectric filter body (1) is made of non-metal materials.

3. A dielectric filter comprising a capacitive coupling structure according to claim 1, wherein: the first debugging hole (2) and the second debugging hole (3) are circular or elliptical in shape.

4. A dielectric filter comprising a capacitive coupling structure according to claim 1, wherein: the total depth of the through hole (401) and the blind hole (402) is larger than the depth of the first debugging hole (2) and the second debugging hole (3).

5. A dielectric filter comprising a capacitive coupling structure according to claim 1, wherein: the conducting layer is made of copper or silver.

6. The dielectric filter including the capacitive coupling structure according to claim 5, wherein the total depth of the through hole (401) and the blind hole (402) is 1.1 ~ 1.5.5 times the depth of the first tuning hole (2).

7. A dielectric filter comprising a capacitive coupling structure according to claim 1, wherein: the conducting layer is attached to the surface of the dielectric filter body (1) in a spraying, dipping, printing or electroplating mode.

Technical Field

The invention relates to a dielectric filter comprising a capacitive 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 dielectric filter containing a capacitive coupling structure, which can realize the capacitive coupling and control of the frequency of a far-end parasitic passband.

In order to achieve the purpose, the invention adopts the technical scheme that: a dielectric filter containing a capacitive coupling structure comprises a dielectric filter body, a first debugging hole and a second debugging hole, the first debugging hole and the second debugging hole are two blind holes arranged on the dielectric filter body, the first debugging hole and the second debugging hole and the medium on the dielectric filter body form two dielectric resonators, a negative coupling hole is arranged between the first debugging hole and the second debugging hole, the negative coupling hole is a step hole consisting of a concentric through hole and a blind hole, one end of the through hole penetrates through the dielectric filter body, the opening direction of the end of the through hole and the openings of the first debugging hole and the second debugging hole are positioned on the same surface of the dielectric filter body, the other end and the blind hole of through-hole are connected, the blind hole is kept away from the one end of through-hole and is the blind end, all be equipped with the conducting layer on the inner wall of through-hole, blind hole and the step of being connected of through-hole and blind hole.

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

1. in the above scheme, the dielectric filter body is made of a non-metallic material.

2. In the above scheme, the first debugging hole and the second debugging hole are circular or elliptical in shape.

3. In the above scheme, the total depth of the through holes and the blind holes is greater than the depth of the first debugging holes and the second debugging holes.

4. In the above scheme, the conductive layer is made of copper or silver.

5. In the above scheme, the total depth of the through hole and the blind hole is 1.1 ~ 1.5.5 times of the depth of the first debugging hole.

6. In the above scheme, the conductive layer is attached to the surface of the dielectric filter body in a spraying, dipping, printing or electroplating manner.

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

1. the dielectric filter comprises a capacitive coupling structure, and realizes the control of the frequency of the far-end parasitic passband while realizing capacitive coupling.

2. The dielectric filter comprises a capacitive coupling structure, a negative coupling hole of the dielectric filter is formed by combining a through hole and a blind hole, one end of the blind hole is a closed end, and the structure has the advantage of avoiding the problem of difficult press forming caused by the fact that the negative coupling hole is too deep.

3. The dielectric filter comprising the capacitive coupling structure has the advantages that the conductive layers are arranged on all the dielectric filters: the method is favorable for metallization process in the production process of the dielectric filter, and due to the existence of the upper conductive hole wall and the lower conductive hole wall, the debugging mode of the coupling hole is more flexible, the side wall of the upper through hole can be polished, the side wall and the bottom of the lower blind hole can also be polished, the coupling can be adjusted to be strong or weak, and the debugging passing rate is improved.

4. The invention comprises a dielectric filter with a capacitive coupling structure, wherein the total depth of a through hole and a blind hole of the dielectric filter is 1.1 ~ 1.5.5 times of the depth of a first debugging hole, the diameter of the through hole is about 1.1 ~ 2 times of the diameter of the blind hole, the larger the diameter of the through hole is, the stronger the formed negative coupling strength is, and the weaker the negative coupling strength is, and the larger the diameter of the blind hole is, the weaker the formed negative coupling strength is, and the stronger the negative coupling strength is.

Drawings

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

In the above drawings: 1. a dielectric filter body; 2. a first pilot hole; 3. a second pilot hole; 4. a negative coupling aperture; 401. a through hole; 402. and (4) blind holes.

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.