CN213845462U

CN213845462U - Metal cavity filter

Info

Publication number: CN213845462U
Application number: CN202022807526.4U
Authority: CN
Inventors: 吴运松; 王宁; 夏金超
Original assignee: Comba Telecom Technology Guangzhou Ltd; Jingxin RF Technology Guangzhou Co ltd
Current assignee: Comba Telecom Technology Guangzhou Ltd; Jingxin RF Technology Guangzhou Co ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-07-30
Anticipated expiration: 2030-11-27

Abstract

The utility model relates to a communication radio frequency technology field, more specifically relates to a metal cavity filter, include: the top of the cavity is provided with a plurality of tuning holes; the bottom plate is covered at the bottom of the cavity; the resonant column and the bottom plate are integrally formed, and the resonant column is arranged in the cavity and has a gap with the top of the cavity; and the tuning assembly is matched with the tuning hole to be arranged at the top of the cavity, and the tuning assembly is arranged corresponding to the resonant column. The utility model is used for optimize traditional metal cavity filter and solve 5G metal filter's miniaturized problem.

Description

Metal cavity filter

Technical Field

The utility model relates to a communication radio frequency technology field, more specifically relates to a metal cavity filter.

Background

The filter is a typical frequency selection device, the quality of the performance of the filter directly affects the quality of the whole communication system, the filter is a vital device in modern microwave and millimeter wave communication systems, and with the current increasingly complex communication environment, a filter with higher performance requirements is needed.

With the development of 5G mobile communication and MIMO technology, metal and dielectric filters with small size and low loss are increasingly used in mobile base stations, and their design methods are receiving more attention. Traditional metal cavity filter mainly includes the cavity, resonance bar and debugging screw rod, columniform resonance bar is located the cavity, to this need reserve the welding space of resonance bar in the cavity, so need increase the cavity size in the technology manufacture process, traditional metal cavity filter does not satisfy the miniaturized characteristic of metal cavity filter, consequently can't obtain fine application in 5G communication, and present conventional 5G metallization small-size filter, all replace traditional metal resonance post with panel beating sheetmetal or conventional air suspension line mode, it is higher to the machining dimension tolerance requirement of cavity or sheetmetal, it is higher to the assembly tolerance requirement, the index uniformity is more difficult to guarantee, be unfavorable for batch production.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming above-mentioned prior art's at least one defect, provide a metal cavity filter for optimize traditional metal cavity filter and solve 5G metal filter's miniaturized problem.

The utility model discloses the technical scheme who takes is, a metal cavity wave filter, include:

the top of the cavity is provided with a plurality of tuning holes;

the bottom plate is covered at the bottom of the cavity;

the resonant column and the bottom plate are integrally formed, and the resonant column is arranged in the cavity and has a gap with the top of the cavity;

and the tuning assembly is matched with the tuning hole to be arranged at the top of the cavity, and the tuning assembly is arranged corresponding to the resonant column.

The utility model relates to a metal cavity filter, carry out the optimal design to traditional metal cavity filter, can satisfy 5G metal cavity filter's miniaturization, its structure mainly includes the cavity, the bottom plate, resonance post and tuning assembly, wherein, the cavity top is equipped with a plurality of tuning holes, tuning hole can be used to install tuning assembly, the bottom of cavity is located to the bottom plate lid, and resonance post and bottom plate integrated into one piece, the bottom plate is through the bottom cooperation installation with the cavity, install the resonance post in the cavity, and there is certain clearance between the top of tuning post and the top of cavity, tuning assembly through tuning hole install at the top of cavity and with be in the corresponding setting of resonance post in the cavity. The utility model relates to a metal cavity filter carries out integrated into one piece's design with bottom plate and resonance post, and the resonance post cover is established in the cavity, so not only need reserve the welding space in the cavity, can reduce the size of metal cavity filter greatly for metal cavity filter miniaturization and lightweight, resonance post and bottom plate integrated into one piece's mode moreover require lowly to assembly tolerance, and the dimensional tolerance uniformity is good, guarantees the uniformity of index, the utility model discloses for current metal cavity filter's processing and assembly mode, greatly reduced processing cost and assemble duration, be fit for batch production.

Furthermore, a metal jumper step is further arranged on the bottom plate, and the metal jumper step and the bottom plate are integrally formed.

The utility model relates to a still include metal wire jumper step on the bottom plate among the metal cavity filter, on the bottom plate and with bottom plate integrated into one piece was located to metal wire jumper step, through metal wire jumper step and bottom plate integrated into one piece's design, optimized further ground to metal cavity filter's processing and assembly type.

Furthermore, the metal jumper step is provided with a through hole which can be matched with the metal jumper.

Furthermore, a counter bore matched with the through hole of the metal jumper step is further arranged on the bottom plate.

The utility model relates to a metal wire jumper step in metal cavity filter is equipped with the through-hole, with the counter bore cooperation on the bottom plate, a metal wire jumper for the assembly metal wire jumper, the metal wire jumper is the cross coupling of a perception, it can produce a zero point at the passband high-end of metal cavity filter, the metal wire jumper step can comprise two independent structures, and correspond the department with the metal wire jumper step on the bottom plate and be equipped with the counter bore, the metal wire jumper is installed on the metal wire jumper step, through-hole through the metal wire jumper step extends to in the counter bore, welded fastening is on the bottom plate.

Further, the bottom plate is also provided with a tapping step, and the tapping step and the bottom plate are integrally formed.

The utility model relates to a bottom plate among metal cavity filter is still including taking a percentage the step, take a percentage the step locate on the bottom plate and with bottom plate integrated into one piece, take a percentage the step locate the both sides of bottom plate and with resonance post and bottom plate integrated into one piece, the utility model relates to a metal cavity filter utilizes and takes a percentage the step, not only can feed in the metal cavity filter or will derive through the signal of metal cavity filter with outside input signal, takes a percentage the step and further reduces assembly process with bottom plate and/or resonance post integrated into one piece moreover, has further reduced processing cost and assembly cost.

Further, the side face of the cavity is provided with a spring needle mounting hole, the spring needle mounting hole is right opposite to the top of the tapping step, a spring needle is mounted in the spring needle mounting hole, and the spring needle is connected with the top of the tapping step.

The utility model relates to a what metal cavity filter's signal input/output mode adopted is the spring pin mode, specifically, and the filter cavity side is equipped with the spring pin mounting hole to the spring pin mounting hole faces the position of taking a percentage step top, installs the spring pin in the spring pin mounting hole, and spring pin one end is just in time being butted at this moment and is taking a percentage the step top. The utility model relates to a metal cavity filter adopts the spring pin to carry out signal input/output, is connected through the spring pin and the step of taking a percentage, takes a percentage the mode that step and resonance post are connected for signal and resonance post carry out the coupling.

Furthermore, the side face of the cavity is provided with a welding operation hole, the welding operation hole is opposite to the spring pin mounting hole, and one end of the spring pin is welded with the top of the tapping step through the welding operation hole.

The utility model relates to a metal cavity filter welds spring pin one end and the step top butt department of taking a percentage through the welding operation hole, the side of cavity is located to the welding operation hole, and be the opposite face with the cavity side that is equipped with the spring pin mounting hole, the welding operation hole sets up with the spring pin mounting hole relatively, the spring pin is installed in the spring pin mounting hole, and spring pin one end with take a percentage the step top contact, from the clearly visible spring pin in welding operation hole and take a percentage the step junction position this moment, couple together the spring pin and take a percentage the step through tinning or other welding modes from the external world. The utility model discloses a be equipped with the welding operation hole to the side of the cavity, weld from the outside on the performance basis that does not influence the metal cavity wave filter, the wave filter need not to reserve the welding space, can further realize the miniaturization of metal cavity wave filter.

Furthermore, be equipped with flying bar screens structure in the cavity, flying bar screens structure department installs flying bar screens medium, just it is equipped with flying bar piece to insert on the flying bar screens medium, flying bar piece passes through flying bar screens medium with flying bar screens structure installs in the cavity.

The utility model relates to a metal cavity filter's cavity still is equipped with flying bar screens structure, flying bar screens structure is used for installing flying bar screens medium, flying bar screens medium is insulating medium, and insert in the flying bar screens medium and be equipped with flying bar piece, fly bar screens medium through inserting and be equipped with flying bar piece and be installed the flying bar screens structure department of fixing in the cavity, make flying bar piece can install in metal cavity filter cavity, fly the distance between bar piece and the resonance post through the adjustment and adjust the coupling volume size. The utility model discloses a fly pole screens structure carries out fixed connection to flying the pole piece, simple structure and the steadiness is effectual.

Furthermore, the side surface of the cavity is also provided with a debugging hole for debugging the flying bar piece.

The utility model relates to a metal cavity filter debugs flying rod piece through the debugging pore pair, flying rod piece can produce a zero point at filter passband low side to the debugging hole is equipped with the cavity side and just to flying the position of rod piece, consequently can set up on the cavity respectively and fly the debugging hole that rod piece both ends correspond the position, can directly use the mode fine setting of pressing or dialling from the outside through the debugging hole and fly the rod piece and the purpose that the distance between the resonance post reaches debugging flying rod piece.

Furthermore, the bottom plate also comprises a tinning groove, the tinning groove is arranged on the peripheral part of the bottom plate, and the bottom plate is welded with the bottom of the cavity through the tinning groove and tin adding.

The utility model relates to a bottom plate peripheral position among metal cavity filter still is equipped with the molten tin bath, and the bottom plate passes through tin cream welded connection with cavity bottom opening and is in the same place, specifically cooperates the installation with the bottom plate earlier to join the molten tin cream in molten tin bath department and weld both firm as an organic whole, adopt to weld bottom plate and cavity with the molten tin bath, reduce the required space of assembly of metal cavity filter, further reduce the size of metal cavity filter.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model relates to a metal cavity filter carries out integrated into one piece's design with bottom plate and resonance post, take a percentage step, metal jumper wire step, so not only need not reserve the welding space in the cavity, can reduce the size of metal cavity filter greatly for metal cavity filter miniaturization and lightweight, the mode of resonance post moreover, it is low to the assembly tolerance requirement, and the dimensional tolerance uniformity is good, guarantees the uniformity of index, the utility model discloses for current processing and the assembly mode of metal cavity filter, greatly reduced processing cost and assemble duration, be fit for batch production.

Drawings

Fig. 1 is a schematic side view of a metal cavity filter according to the present invention.

Fig. 2 is another side structure schematic diagram of the metal cavity filter of the present invention.

Fig. 3 is a top view of the metal cavity filter after assembly.

The labels in the figure are:

100. a cavity; 110. welding an operation hole; 120. debugging the hole; 130. a spring pin mounting hole;

200. a base plate; 210 a resonant column; 220. tapping a step; 230. a metal jumper step; 240. a counter bore; 250. adding a tin bath; 300. a tuning component; 400. a pogo pin; 500. a metal jumper wire; 600. a fly rod sheet; 610. the flying stem piece captures media.

Detailed Description

The drawings of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The metal cavity filter is a microwave filter adopting a resonant cavity structure, and one cavity can be equivalent to an inductor and a capacitor connected in parallel, so that a resonant level is formed, and the microwave filtering function is realized. Compared with microwave filters with other properties, the cavity filter has the advantages of firm structure, stable and reliable performance, smaller volume, moderate Q value, far high-end parasitic passband and good heat dissipation. Therefore, the application of the cavity filter is very common in each large communication base station.

Examples

As shown in fig. 1 and fig. 2, which are schematic side structure diagrams of a metal cavity filter of the present embodiment, where fig. 1 is shown from one side surface of the metal cavity filter, and fig. 2 is shown from the other side surface of the metal cavity filter, the structure of the present embodiment will now be described in detail, and specifically, the metal cavity filter includes:

the cavity 100 is provided with a plurality of tuning holes at the top of the cavity 100;

the bottom plate 200 is covered at the bottom of the cavity 100 by the bottom plate 200;

the resonant column 210 is integrally formed with the bottom plate 200, the resonant column 210 is disposed in the cavity 100 and has a gap with the top of the cavity 100, the resonant column 210 is six cylindrical hollow tubes 210 shown in fig. 1 and 2 in this embodiment, and a gap is disposed between the resonant column 210 and the top of the cavity 100;

a tuning assembly 300, wherein the tuning assembly 300 is matched with the tuning hole to be arranged at the top of the cavity 100, and the tuning assembly 300 is arranged corresponding to the resonant column 210; specifically, in the present embodiment, the tuning assembly 300 is a screw and nut combination, and a portion of the tuning assembly 300 penetrates through the tuning hole and is installed in cooperation with the cylindrical hollow tube 210, and by adjusting the relative position between the tuning assembly 300 and the cylindrical hollow tube 210, the tuning assembly 300 can be screwed in or out, so that the relative position between the tuning assembly 300 and the cylindrical hollow tube 210 becomes larger or smaller, and thus the resonant frequency of the metal cavity filter changes to adjust the frequency parameter, the frequency tuning range of the resonant column of the tuning assembly is larger, and the influence of tolerance can be effectively compensated.

Preferably, a metal jumper step 230 is further disposed on the bottom plate 200, and the metal jumper step 230 is integrally formed with the bottom plate 200.

Preferably, the metal jumper step 230 is provided with a through hole capable of being matched with the metal jumper 500.

Preferably, the bottom plate 200 is further provided with a counter bore 240 which is matched with the through hole of the metal jumper step 230.

Specifically, in the present embodiment, the metal jumper 500 is a rectangular structure lacking one side, that is, the metal jumper 500 has three sides, two of the sides are parallel to each other, one of the sides is perpendicular to the other two sides, in order to assemble the metal jumper 500, the metal jumper step 230 is formed by two independent structures and is provided with a through hole, a countersunk hole 240 with tin is arranged at a position on the bottom plate corresponding to the metal jumper step 230, two sides of the metal jumper 500 that are parallel to each other are installed in the metal jumper step 230 and extend to the countersunk hole 240 on the bottom plate, and the countersunk hole 240 is used for soldering the metal jumper 500.

Preferably, the bottom plate 200 is further provided with a tapping step 220, and the tapping step 220 is integrally formed with the bottom plate 200; specifically, in the present embodiment, the top of the tapping step 220 is a convex structure, and the height thereof is slightly lower than the height of the resonant pillar 210, and in the present embodiment, the two tapping steps 220 are respectively disposed on two sides of the bottom plate 200 and are integrally formed with the resonant pillar 210 and the bottom plate 200.

Preferably, a spring pin mounting hole 130 is formed in the side surface of the cavity 100, the spring pin mounting hole 130 faces the top of the tapping step 220, a spring pin 400 is mounted in the spring pin mounting hole 130, and the spring pin 400 is connected with the top of the tapping step 220; specifically, in this embodiment, two pogo pin mounting holes 130 are respectively formed in the side surface of the cavity 100, the two pogo pin mounting holes 130 respectively face the top positions of the two tapping steps 220, in this embodiment, the pogo pin 400 is disposed in a cylindrical insulating medium, the length of the cylindrical insulating medium is smaller than that of the pogo pin 400, the insulating medium is mounted in the pogo pin mounting holes 130, and one side of the pogo pin 400 mounted in the cavity 100 abuts against the top of the tapping steps 220.

Preferably, a welding operation hole 110 is formed in a side surface of the cavity 100, the welding operation hole 110 is disposed opposite to the pogo pin mounting hole 130, and one end of the pogo pin 400 is welded to the top of the tapping step 220 through the welding operation hole 110; specifically, two welding operation holes 110 are provided in the present embodiment, the two welding operation holes 110 are provided on the side surface of the cavity 100, and are opposite to the side surface of the cavity provided with the pogo pin mounting hole 130, the welding operation holes 110 are arranged opposite to the pogo pin mounting hole 130, at this time, the positions of the tops of the pogo pin 400 and the tapping step 220 are clearly visible from the welding operation holes, and one end of the pogo pin 400 and the top of the tapping step 220 are welded by soldering the welding operation holes 110 from the outside or by other welding methods.

Preferably, a flying bar clamping structure is arranged in the cavity 100, a flying bar clamping medium 610 is arranged at the flying bar clamping structure, a flying bar piece 600 is inserted on the flying bar clamping medium, and the flying bar piece 600 is arranged in the cavity 100 through the flying bar clamping medium 610 and the flying bar clamping structure; specifically, in the present embodiment, the flying bar clamping structures are not shown in the drawing, there are two flying bar clamping media 610, the flying bar clamping media 610 is an insulating medium, the flying bar piece 600 is one flying bar piece 600, the flying bar piece 600 is made of a metal material, the flying bar clamping media 610 and the flying bar piece 600 are installed perpendicularly, the flying bar clamping media 610 inserted with the flying bar piece 600 are installed and fixed at the flying bar clamping structure in the cavity 100, so that the flying bar piece 600 can be installed at a position above 1/2 of the depth of the cavity of the metal cavity filter and fixedly connected with the cavity, and the coupling amount is adjusted by adjusting the distance between the flying bar piece 600 and the resonant column 210.

Preferably, the side surface of the cavity 100 is further provided with a debugging hole 120 for debugging the flying bar piece 600; specifically, two debugging holes 120 are provided in this embodiment, the debugging holes 120 are provided on the side surface of the cavity 100 and directly face the position of the flying bar piece 600, the flying bar piece 600 is made of sheet metal, the two debugging holes 120 corresponding to the two ends of the flying bar piece can be respectively provided on the cavity, and the distance between the flying bar piece 120 and the resonant column 220 can be finely adjusted by directly pressing or dialing the debugging holes 120 from the outside to debug the flying bar piece 600.

Preferably, the bottom plate 200 further comprises a tinning groove 250, the tinning groove 250 is arranged at the peripheral part of the bottom plate 200, and the bottom plate 200 and the bottom of the cavity 100 are soldered by the tinning groove 250.

A structure of the metal cavity filter in which the cavity 100 and the bottom plate 200 are integrally formed will be described:

the cavity 100 is a hollow cuboid structure with an opening at the bottom, a plurality of tuning holes are formed in the top of the cavity 100 and are threaded holes, two spring pin mounting holes 130 are formed in one side surface of the cavity 100, two welding operation holes 110 are formed in the other side surface of the cavity 100 opposite to the spring pin mounting holes 130, and two debugging holes 120 are formed in the cavity 100 on the same side surface with the welding operation holes 110; a flying rod clamping structure is arranged in the cavity 100;

the base plate 200, the resonance columns 210, the tapping steps 220 and the metal jumper steps 230 are integrally formed, six resonance columns 210 are arranged on the base plate 200, the tapping steps 220 are arranged on two sides of the base plate 200 and connected with the resonance columns 210 at two ends, and the metal jumper steps 230 are arranged on the base plate 200 and arranged on one side of the resonance columns 210.

Fig. 3 is a plan view of the metal cavity filter after being assembled according to the present invention, illustrating the assembly process of the metal cavity filter of the present embodiment:

firstly, the metal jumper wire 500 passes through a through hole arranged on a metal jumper wire step 230, is added with tin through a counter bore 240 arranged on the base plate 200, and is welded on the base plate 200;

secondly, installing the flying bar clamping medium 610 inserted with the flying bar piece 600 on the flying bar clamping structure of the cavity 100, and installing the two pogo pins 400 wrapped with the insulating medium in the pogo pin installation holes 130 of the cavity 100;

finally, the bottom plate 200 and the bottom opening of the cavity 100 are fitted together, the two are soldered together by the solder bath 250 and solder paste, and the pogo pin 400 and the tap step 220 are soldered together through the soldering operation hole 110.

The utility model discloses beneficial effect does: the embodiment of the utility model provides a metal cavity filter carries out integrated into one piece's design with bottom plate and resonance post, take a percentage step and metal jumper wire step, so not only need not reserve the welding space in the cavity, can reduce the size of metal cavity filter greatly for metal cavity filter is miniaturized and lightweight, and bottom plate and resonance post integrated into one piece's mode moreover requires lowly to assembly tolerance, and the dimensional tolerance uniformity is good, guarantees the uniformity of index, the utility model discloses for current metal cavity filter's processing and assembly mode, greatly reduced processing cost and assemble duration, be fit for batch production.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not limitations to the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A metal cavity filter, comprising:

the top of the cavity is provided with a plurality of tuning holes;

the bottom plate is covered at the bottom of the cavity;

2. The metal cavity filter of claim 1, wherein the bottom plate is further provided with a metal jumper step, and the metal jumper step is integrally formed with the bottom plate.

3. The metal cavity filter of claim 2, wherein the metal jumper step is provided with a through hole capable of being matched with the metal jumper.

4. The metal cavity filter of claim 3, wherein the bottom plate is further provided with a counter bore matched with the through hole of the metal jumper step.

5. The metal cavity filter of claim 1, wherein the bottom plate further comprises a tapping step, and the tapping step is integrally formed with the bottom plate.

6. The metal cavity filter as claimed in claim 5, wherein a pogo pin mounting hole is formed in a side surface of the cavity, the pogo pin mounting hole is opposite to a top of the tap step, a pogo pin is mounted in the pogo pin mounting hole, and the pogo pin is connected with the top of the tap step.

7. The metal cavity filter as claimed in claim 6, wherein a welding operation hole is formed in a side surface of the cavity, the welding operation hole is disposed opposite to the pogo pin mounting hole, and one end of the pogo pin is welded to the top of the tap step through the welding operation hole.

8. The metal cavity filter according to claim 1, wherein a flying bar clamping structure is disposed in the cavity, a flying bar clamping medium is disposed at the flying bar clamping structure, and a flying bar sheet is inserted on the flying bar clamping medium and is mounted in the cavity through the flying bar clamping medium and the flying bar clamping structure.

9. The metal cavity filter according to claim 8, wherein the cavity side surface is further provided with a debugging hole for debugging the flying bar piece.

10. The metal cavity filter of claim 1, wherein the bottom plate further comprises a tinning bath, the tinning bath is disposed at a peripheral portion of the bottom plate, and the bottom plate and the bottom of the cavity are soldered by the tinning bath and the tin.