CN211295336U

CN211295336U - Dielectric filter and communication device having the same

Info

Publication number: CN211295336U
Application number: CN202020113608.6U
Authority: CN
Inventors: 吴亚晖; 袁昕; 李�杰; 王浩
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-08-18
Anticipated expiration: 2030-01-17

Abstract

The utility model provides a dielectric filter and have this dielectric filter's communication device belongs to the communication technology field, wherein dielectric filter, include: a dielectric block having a front side provided with a plurality of tuning holes and a back side opposite to the front side; a first blind groove which is not communicated to the back surface of the dielectric block is arranged between the two tuning holes on the front surface of the dielectric block, and the depth of the first blind groove is more than 0.5 time of the thickness of the dielectric filter; the utility model discloses a dielectric filter, the front of dielectric block is located between two tuning holes and is provided with the first blind groove that does not link up to the reverse side of dielectric block, and the depth of first blind groove is greater than 0.5 times the thickness of dielectric block; through the first blind slot, the negative coupling between the tuning holes can be larger than the positive coupling without a cascade accessory structure outside the dielectric block, thereby meeting the requirement on the miniaturization of the dielectric filter.

Description

Dielectric filter and communication device having the same

Technical Field

The utility model relates to the field of communication technology, concretely relates to dielectric filter and have this dielectric filter's communication device.

Background

A Dielectric filter (Dielectric filter) is a microwave filter that uses a Dielectric tuning hole to achieve frequency selection through multi-stage coupling. In modern mobile communication technology, a dielectric filter has become an essential important component, and is widely applied to various mobile communication systems for filtering out noise waves or interference signals outside communication signal frequencies.

As with the metal filter, achieving high selectivity of the dielectric filter requires cross-coupling to be formed in the dielectric filter. The cross coupling is divided into two forms of capacitive coupling and inductive coupling, wherein the capacitive coupling is to form a transmission zero at the low end of the response of the dielectric filter so as to form high selectivity of the low end of the dielectric filter; inductive coupling is the formation of transmission zeros at the high end of the dielectric filter response, thus creating high selectivity at the high end of the dielectric filter.

At present, in a dielectric filter commonly used in the industry, a transmission zero of the dielectric filter can only realize inductive coupling, and an additional structure such as a PCB or a jumper cable needs to be cascaded outside a medium to realize capacitive coupling of the dielectric filter. However, these additional structures cause inconvenience in the fabrication, assembly and debugging of the dielectric filter.

With the increasing development of wireless communication technology, the volume miniaturization of base stations is required. The volume occupied by the dielectric filter in the base station also needs to be miniaturized, and the existing dielectric filter capable of realizing capacitive coupling can be realized only by a cascade attachment structure outside the medium, so that the existing dielectric filter cannot meet the requirement of the existing communication technology on the miniaturization of the base station.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a can realize the dielectric filter of negative coupling and have this dielectric filter's communication device.

In order to solve the above technical problem, the utility model provides a dielectric filter, include:

a dielectric block having a front side provided with a plurality of tuning holes and a back side opposite to the front side;

and a first blind groove which is not communicated to the back surface of the dielectric block is arranged between the two tuning holes on the front surface of the dielectric block, and the depth of the first blind groove is more than 0.5 time of the thickness of the dielectric filter.

Preferably, a second blind groove is formed in the reverse surface of the dielectric block opposite to the first blind groove.

Preferably, a positioning adjustment groove for adjusting coupling is formed in the bottom surface of the first blind groove.

Preferably, the positioning adjustment groove penetrates through a second blind groove on the reverse side of the medium block.

Preferably, the positioning adjustment groove penetrates through the reverse side of the medium block.

Preferably, the positioning adjustment groove is located at one end close to the center of the dielectric block in the first blind groove.

Preferably, one end of the first blind groove is communicated with a through groove which is arranged on the dielectric block and penetrates through the front surface and the back surface of the dielectric block.

Preferably, the other end of the first blind groove penetrates through one side edge of the dielectric block.

The utility model also provides a communication device, include: the dielectric filter of any of the above aspects.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a dielectric filter, the front of the dielectric block is located between two tuning holes and is provided with a first blind groove which is not communicated to the back of the dielectric block, and the depth of the first blind groove is more than 0.5 times the thickness of the dielectric block; through the first blind slot, the negative coupling between the tuning holes can be larger than the positive coupling without a cascade accessory structure outside the dielectric block, thereby meeting the requirement on the miniaturization of the dielectric filter.

2. The utility model provides a dielectric filter is relative with first blind groove the reverse side of dielectric block is equipped with the blind groove of second, through the setting in the blind groove of second, but dielectric filter can realize the negative coupling between the tuning hole more easily.

3. The utility model provides a dielectric filter, the positioning adjustment groove who is used for adjusting the coupling is seted up in the bottom surface in first blind groove, can be used to perturbation negative coupling to form the negative coupling structure of easily adjusting, realize individual layer dielectric filter's tunable negative coupling. And the positioning and adjusting groove is positioned at one end close to the center of the medium block in the first blind groove, so that the adjusting sensitivity is stronger, and the adjusting amount can be increased.

4. The utility model provides a dielectric filter, the one end in first blind groove and the logical groove intercommunication of the tow sides that link up the dielectric block, the other end in first blind groove link up extremely a side of dielectric block, so set up the processing in the first blind groove of can being convenient for.

5. The dielectric block of the dielectric filter provided by the utility model can be integrally formed, and has very good consistency and mass production; the structure with negative coupling and the positive coupling structure are combined, so that the frequency of the filter correspondingly has transmission zero and better out-of-band rejection compared with the naturally attenuated frequency.

Drawings

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

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

Fig. 2 is a reverse perspective view of the dielectric filter of fig. 1.

Fig. 3 is a front perspective view of a dielectric filter according to a second embodiment of the present invention.

Fig. 4 is a frequency response curve of the dielectric filter of the present invention.

Description of reference numerals:

1. a front side; 2. the reverse side; 3. a tuning hole; 4. a through groove; 5. a first blind slot; 6. a second blind slot; 7. an input port; 8. an output port; 9. and positioning the adjusting groove.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection 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", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific 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 is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

The present embodiment provides a dielectric filter including: a dielectric block having a front side 1 provided with a plurality of tuning holes 3 and a back side 2 opposite to the front side 1.

As shown in fig. 1, in the present embodiment, the front surface 11 of the dielectric block has four tuning holes 3 arranged in a matrix, and the tuning holes 3 are blind holes with a circular structure, which are shown as not penetrating to the other surface of the dielectric block. The front surface 1 of the dielectric block is also provided with a through groove 4 penetrating through the front surface and the back surface of the dielectric block, the through groove 4 comprises a transverse through groove and a longitudinal through groove, the front surface 1 of the dielectric block is divided into a plurality of areas by the through groove 4, and each area is at least provided with one tuning hole 3. In addition, as an alternative embodiment, the tuning holes 3 may also be provided in three, five or more.

A first blind groove 5 which is not communicated to the back surface 2 of the medium block is arranged between the two tuning holes 3 on the front surface 1 of the medium block, one end of the first blind groove 5 is communicated with the middle part of one transverse through groove, and the other end of the first blind groove 5 is closed. The depth of the first blind groove 5 is more than 0.5 time of the thickness of the medium block.

As shown in fig. 2, a second blind groove 6 is arranged on the back surface 2 of the dielectric block at a position opposite to the first blind groove 5, and the extending direction of the second blind groove is the same as that of the first blind groove. In addition, an input port 7 and an output port 8 are respectively arranged at positions opposite to the other two adjacent tuning holes 3 on the back surface 2 of the dielectric block, and the input port 7 and the output port 8 are both blind holes.

A positioning adjusting groove 9 for adjusting coupling is formed in the bottom surface of the first blind groove 5, the positioning adjusting groove 9 is located at one end, close to the center of the dielectric block, in the first blind groove 5, and the positioning adjusting groove 9 penetrates through the second blind groove 6 of the reverse surface 2. In addition, as an alternative embodiment, the positioning adjustment groove 9 may also be a blind hole which does not penetrate into the second blind groove 6.

The dielectric block is made of ceramic materials, and a metal layer covers the outside of the dielectric block. In this embodiment, silver is used as the metal of the metal layer, and copper, tin, aluminum, or the like may be used.

The metal layer avoids the shielded areas around the input port 7 and the output port 8 on the back of the dielectric block.

The metal layer of the dielectric block covered in the tuning hole 3 of the front surface 1 can be removed according to the actual situation, so as to adjust the filter characteristic.

The metal layer covered in the positioning adjusting groove 9 on the front surface 1 of the dielectric block can be removed according to the actual situation, so that the filter characteristic can be adjusted.

Example 2

The present embodiment provides a dielectric filter having substantially the same structure as that of embodiment 1, except that: as shown in fig. 3, the dielectric block of this embodiment is only provided with a first blind groove 5 on the front surface 1, and one end of the first blind groove 5 is communicated with the middle of one of the transverse through grooves, and the other end of the first blind groove 5 penetrates through to one side edge of the dielectric block.

In the present embodiment, the positioning adjustment groove 9 located on the bottom surface of the first blind groove 5 is a blind hole that does not penetrate through to the reverse surface 2. In addition, as an alternative embodiment, the positioning adjustment groove 9 may be omitted.

Example 3

The present embodiment provides a dielectric filter having substantially the same structure as that of embodiment 1, except that: one end of the first blind groove 5 of the present embodiment is communicated with the middle of one of the transverse through grooves, and the other end of the first blind groove 5 penetrates through to one side edge of the dielectric block. The structure arrangement can facilitate the processing of the first blind groove 5, and reduce the production cost.

Fig. 4 shows a frequency response curve of the dielectric filter in this embodiment.

Example 4

This embodiment provides a communication device including at least one dielectric filter described in embodiment 1, embodiment 2, or embodiment 3.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A dielectric filter, comprising:

a dielectric block having a front face (1) provided with a plurality of tuning holes (3) and a back face (2) opposite to the front face (1);

and a first blind groove (5) which is not communicated to the back surface (2) of the dielectric block is arranged between the two tuning holes (3) on the front surface (1) of the dielectric block, and the depth of the first blind groove (5) is more than 0.5 time of the thickness of the dielectric filter.

2. A dielectric filter according to claim 1, characterized in that a second blind slot (6) is provided on the opposite side (2) of the dielectric block to the first blind slot (5).

3. The dielectric filter according to claim 2, wherein a positioning adjustment groove (9) for adjusting coupling is formed in a bottom surface of the first blind groove (5).

4. A dielectric filter according to claim 3, characterized in that the positioning adjustment groove (9) penetrates into a second blind groove (6) of the opposite face (2) of the dielectric block.

5. The dielectric filter according to claim 1, wherein a positioning adjustment groove (9) for adjusting coupling is formed in a bottom surface of the first blind groove (5).

6. A dielectric filter according to claim 5, characterized in that the positioning adjustment groove (9) penetrates to the reverse face (2) of the dielectric block.

7. A dielectric filter according to any of claims 3 to 6, characterized in that the positioning adjustment groove (9) is located at one end near the center of the dielectric block within the first blind groove (5).

8. The dielectric filter according to claim 1, wherein one end of the first blind groove (5) is communicated with a through groove (4) which is arranged on the dielectric block and penetrates through the front and back surfaces of the dielectric block.

9. A dielectric filter according to claim 8, characterized in that the other end of the first blind slot (5) is through to one side of the dielectric block.

10. A communication device, comprising: a dielectric filter as claimed in any one of claims 1 to 9.