CN215896650U - Cavity filter - Google Patents

Abstract

The utility model belongs to the technical field of filters, and provides a cavity filter, which comprises: a cavity; the bosses are arranged at the bottom of the cavity in a staggered manner; the bottom surface of the resonance column is welded on the lug boss in a pressing manner; the resonance column comprises a column body section and a disc section, and the disc section is arranged at the upper end of the column body section; the cover plate is arranged on the cavity. Through adopting the technical scheme that provides in this application embodiment, the upper surface of cavity includes a plurality of bosss, and the boss is crisscross to be set up, and on the resonance post was fixed in the boss through the mode of pressure welding, made the uniformity high in the assembling process, avoided the problem of assembly difficulty in the production process to assembly efficiency has effectively been improved.

Description

Cavity filter

Technical Field

The utility model relates to the technical field of filters, in particular to a cavity filter.

Background

The cavity filter is a frequency selection device widely applied to the communication front end of a base station, has the characteristics of high Q value, high power, low loss and the like, and has irreplaceable effect compared with other types of filters. With the rapid development of communication systems and the continuous improvement of the demands of people on high quality, high speed and large capacity communication, the front-end devices of base station communication also tend to be miniaturized, integrated and high-performance, and especially the coming of the 5G era further promotes the miniaturization development process of cavity filters.

In the traditional cavity filter, a resonance column is fixedly installed in a mode that a screw penetrates through a through hole reserved in the center of the resonance column, and a threaded part of the screw is screwed into a threaded hole matched with the cavity. This type of mounting results in difficult and inefficient assembly during the manufacturing process.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides a cavity filter to avoid the problems of difficult assembly and low efficiency of a resonant column.

The utility model provides a cavity filter, comprising:

a cavity;

the bosses are arranged at the bottom of the cavity in a staggered manner;

the bottom surface of the resonance column is welded on the lug boss in a pressing mode; the resonance column comprises a column body section and a disc section, and the disc section is arranged at the upper end of the column body section;

the cover plate is arranged on the cavity.

According to the cavity filter, the upper surface of the cavity comprises the bosses which are arranged in a staggered mode, and the resonance columns are fixed on the bosses in a pressure welding mode, so that the consistency in the assembling process is high, and the assembling efficiency is effectively improved.

Optionally, the resonant columns include a first resonant column and a resonant column pair, the resonant column pair includes two second resonant columns that are paired into a group, and the second resonant columns are arranged in a central symmetry manner.

Optionally, the second resonant column further includes an extension section, the extension section is connected to the disk section, and the extension section is disposed on the inner side of the resonant column pair.

According to the cavity filter, the cross coupling is designed into a whole with the resonant column, a supporting structure and a copper rod do not need to be additionally assembled, the assembling efficiency is improved, the integration degree is improved, and the size of the cavity filter is reduced.

Optionally, the extension is "L" shaped.

Optionally, a debugging screw is further arranged on the resonance column, the debugging screw is a self-locking screw, and a gap is formed between the debugging screw and the resonance column.

According to the technical scheme, the debugging screw rod is the self-locking screw rod, and the debugging process does not need to be locked, so that the efficiency of the filter debugging process is improved.

Optionally, a plurality of through holes are formed in the cover plate, and the through holes correspond to the debugging screw rods.

Optionally, the debugging screw rod includes from lock section and body of rod section, the body of rod section set up in the upper surface of lock section, the upper surface of lock section with the upper surface of apron is on the coplanar.

Optionally, the cover plate and the cavity are fixed by reflow soldering.

According to the technical scheme, the cover plate and the cavity are fixed in a reflow soldering mode, fastening screws do not need to be installed, and the problem that the thickness of the outer wall of the filter needs to be guaranteed in order to install the screws is solved. Through the mode of using reflow soldering to fix, can reduce the thickness of wave filter outer wall, reduce the volume of wave filter.

By adopting the technical scheme, the utility model has the following beneficial effects:

1) the upper surface of the filter cavity that this application includes a plurality of bosss, and the boss is crisscross to be set up, and on the mode that the resonance post passes through the pressure welding was fixed in the boss, the uniformity was high in the messenger assembling process to assembly efficiency has effectively been improved.

2) The cross coupling in this application adopts the design integrative with the resonance post, need not additionally to assemble bearing structure and bar copper, has improved assembly efficiency, has improved the degree of integrating simultaneously, has reduced the volume of wave filter.

3) The debugging screw rod in this application need not locking for the auto-lock screw rod, has improved the efficiency to the wave filter debugging in-process.

4) The cover plate and the cavity are fixed in a reflow soldering mode, fastening screws do not need to be installed, and the problem that the thickness of the outer wall of the filter needs to be guaranteed in order to install the screws is solved. Through the mode of using reflow soldering to fix, can reduce the thickness of wave filter outer wall, reduce the volume of wave filter.

Drawings

In order to more clearly illustrate the detailed description of the utility model or the technical solutions in the prior art, the drawings that are needed in the detailed description of the utility model or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is an exploded view of a cavity filter provided by an embodiment of the present invention;

FIG. 2 is a top view of a chamber provided by an embodiment of the utility model;

FIG. 3 is a schematic view of a debugging screw provided in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a first resonant column according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a second resonant column according to an embodiment of the present invention.

Reference numerals:

100-a cavity filter; 110-a cavity; 111-boss; 120-a cover plate; 130-a resonant column; 131-a through hole; 132-cylinder section; 133-disc segment; 134-a first resonant column; 135-resonant column pair; 1351-second resonator column; 1352-an extension; 140-debugging the screw rod; 141-a self-locking section; 142-rod section.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the utility model pertains.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 to 5, the present invention provides a cavity filter 100, including:

a cavity 110;

the bosses 111 are arranged at the bottom of the cavity 110 in a staggered manner;

a plurality of resonance columns 130, wherein a through hole 131 which axially penetrates through the resonance columns 130 is arranged in the resonance columns 130, and the bottom surfaces of the resonance columns 130 are welded on the bosses 111 in a pressing mode; the resonance column 130 includes a column section 132 and a disc section 133, the disc section 133 being disposed at an upper end of the column section 132;

and a cover plate 120, wherein the cover plate 120 is disposed on the cavity 110.

According to the cavity filter provided by the utility model, the upper surface of the cavity comprises the bosses 111, the bosses 111 are arranged in a staggered manner, and the resonance columns are fixed on the bosses 111 in a pressure welding manner, so that the consistency in the assembly process is high, and the assembly efficiency is effectively improved.

Optionally, the resonant post 130 includes a first resonant post 134 and a pair of resonant posts 135, the pair of resonant posts 135 includes two second resonant posts 1351 in a group, and the second resonant posts 1351 are arranged in central symmetry. The pair of second resonant columns 1351 included in the pair of resonant columns 135 forms a cross-coupling structure with the first resonant column 134, and generates a transmission zero outside the pass band of the filter to improve out-of-band rejection, and reduces the order number of the filter, thereby reducing the size of the filter.

Optionally, referring to fig. 1, the second resonant post 1351 further comprises an extension portion 1352, the extension portion 1352 is connected to the disc portion 133, and the extension portion 1352 is disposed inside the pair of resonant posts 135. The cross-coupling structure includes a pair of resonant pillars 135, an extension 135 included in a second resonant pillar 1351 of the pair of resonant pillars 135 is integrally designed with the resonant pillars, and the extension 1352 is L-shaped. Need not extra assembly bearing structure and bar copper, improved assembly efficiency, improved the degree of integrating simultaneously, reduced the volume of wave filter.

Optionally, referring to fig. 1, a debugging screw 140 is further disposed on the resonant post 130, the debugging screw 140 is a self-locking screw, and a gap is formed between the debugging screw 140 and the resonant post 130. The debugging screw 140 is a self-locking screw, and does not need to be locked in the debugging process, so that the efficiency of the filter debugging process is improved.

Optionally, referring to fig. 1, a plurality of through holes 121 are formed in the cover plate 120, and the through holes 121 are disposed corresponding to the debugging screws 140.

Optionally, referring to fig. 3, the adjusting screw 140 includes a self-locking section 141 and a rod section 142, the rod section 142 is disposed on an upper surface of the self-locking section 141, and an upper surface of the self-locking section 141 and an upper surface of the cover plate 120 are on the same plane.

Optionally, the cover plate 120 and the cavity 110 are fixed by reflow soldering. The cover plate 120 and the cavity 110 are fixed by reflow soldering without installing fastening screws, thereby avoiding the problem that the thickness of the outer wall of the filter must be ensured in order to install the screws. Through the mode of using reflow soldering to fix, can reduce the thickness of wave filter outer wall, reduce the volume of wave filter.

In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the utility model may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims (8)

1. A cavity filter, comprising:

a cavity;

the bosses are arranged at the bottom of the cavity in a staggered manner;

the bottom surface of the resonance column is welded on the lug boss in a pressing mode; the resonance column comprises a column body section and a disc section, and the disc section is arranged at the upper end of the column body section;

the cover plate is arranged on the cavity.

2. The cavity filter according to claim 1, wherein the resonant columns include a first resonant column and a pair of resonant columns, the pair of resonant columns includes a second resonant column grouped two by two, and the second resonant columns are arranged in central symmetry.

3. The cavity filter of claim 2, wherein the second resonator column further comprises an extension section, the extension section is connected to the disk section, and the extension section is disposed inside the pair of resonator columns.

4. The cavity filter of claim 3, wherein the extension is "L" shaped.

5. The cavity filter of claim 1, wherein the resonant column is further provided with a debugging screw, the debugging screw is a self-locking screw, and a gap is formed between the debugging screw and the resonant column.

6. The cavity filter of claim 5, wherein the cover plate is provided with a plurality of through holes, and the through holes are arranged corresponding to the debugging screw rods.

7. The cavity filter of claim 6, wherein the debugging screw comprises a self-locking section and a rod section, the rod section is disposed on an upper surface of the self-locking section, and the upper surface of the self-locking section is on the same plane as the upper surface of the cover plate.

8. The cavity filter of claim 1, wherein the cover plate and the cavity are secured by reflow soldering.

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