CN216214000U - Connection structure of filter and filter - Google Patents

Abstract

The application discloses a connecting structure of a filter and the filter, wherein the filter comprises a cavity, the connecting structure is arranged in the cavity, the connecting structure comprises a connecting piece, a fixing piece, a first insulating piece, a second insulating piece and a mounting seat, the connecting piece is arranged between the first insulating piece and the second insulating piece, one side, far away from the connecting piece, of the first insulating piece is abutted to the mounting seat, one side, far away from the connecting piece, of the second insulating piece is abutted to the fixing piece, and the fixing piece sequentially penetrates through the second insulating piece, the connecting piece and the first insulating piece and is fixedly connected in the mounting seat; wherein the connecting sheet is not in contact with the mounting seat and the fixing piece; the first insulating part and the second insulating part are made of insulating materials, and the fixing part is made of metal materials. This application is through above mode to reduced the defective rate that set screw thread fit appears, reduction in production cost.

Description

Connection structure of filter and filter

Technical Field

The application relates to the technical field of filters, in particular to a connecting structure of a filter and the filter.

Background

In a capacitive coupling mode of the filter, a metal coupling piece is used for realizing capacitive coupling connection, the metal coupling piece needs to be assembled on a metal cavity of a resonator, but the metal coupling piece and the resonator cannot be in direct contact, otherwise, a short circuit is caused. In the prior art, the scheme is that a plastic gasket or a plastic clamping seat is arranged between a metal coupling sheet and a metal cavity, and all parts are connected together through plastic screws.

However, since the thread precision of the plastic screw is not high, the thread fit is not matched, so that the loose-tightening bad ratio occurs; meanwhile, after the product is subjected to high and low temperature tests, the plastic screw has a poor loosening proportion.

How to reduce the reject ratio of the screw thread matching of the fixing screw and reduce the production cost becomes a problem which needs to be solved urgently in the field.

SUMMERY OF THE UTILITY MODEL

The utility model provides a connection structure and wave filter of wave filter to reduce the defective rate that set screw thread fit appears, reduction in production cost.

The application discloses a connecting structure of a filter, the filter comprises a cavity, the connecting structure is arranged in the cavity, the connecting structure comprises a connecting piece, a fixing piece, a first insulating piece, a second insulating piece and a mounting seat, the connecting piece is arranged between the first insulating piece and the second insulating piece, one side, far away from the connecting piece, of the first insulating piece is abutted to the mounting seat, one side, far away from the connecting piece, of the second insulating piece is abutted to the fixing piece, and the fixing piece sequentially penetrates through the second insulating piece, the connecting piece and the first insulating piece and is fixedly connected in the mounting seat; wherein the connecting sheet is not in contact with the mounting seat and the fixing piece; the first insulating part and the second insulating part are made of insulating materials, and the fixing part is made of metal materials.

Optionally, the connecting piece is provided with a first through hole, a boss is arranged on one side of the first insulating piece away from the mounting seat, and the connecting piece is sleeved on the outer side wall of the boss through the first through hole; the second insulating part is provided with a second through hole, and the second through hole corresponds to the boss in position; the boss is provided with a boss hole, the boss hole penetrates through the boss and the first insulating part along the center line direction of the boss, the mounting seat is provided with a fixing groove corresponding to the boss hole, the fixing part comprises a screw, and the screw penetrates through the second through hole and the boss hole and is fixedly connected in the fixing groove; and the width of the top of the screw is larger than the width of the boss hole.

Optionally, the width of the second through hole is greater than the width of the boss, the second insulating member is sleeved on the outer side wall of the boss through the second through hole, and the height of the boss protruding out of the connecting piece is less than or equal to the thickness of the second insulating member.

Optionally, the outer side wall of the boss is provided with an external thread, the inner side wall of the second through hole is provided with an internal thread, and the external thread is matched with the internal thread to connect the second insulating part with the outer side wall of the boss in a threaded manner.

Optionally, the width of the second through hole is smaller than the width of the boss and is greater than or equal to the width of the boss hole, the second through hole and the boss hole are coaxially and correspondingly arranged, and the height of the boss is smaller than or equal to the thickness of the connecting piece.

Optionally, the outer side wall of the boss is provided with a limiting protrusion or a limiting groove, and the inner wall of the corresponding first through hole is provided with a limiting groove or a limiting protrusion for limiting the rotation of the connecting piece.

Optionally, the inner wall of the fixing groove is provided with a thread structure corresponding to the screw.

Optionally, a groove is formed in the top of the screw, the groove is in a long strip shape or a plum blossom shape, the connecting piece is in a sheet structure formed by stamping and is made of a metal material, and the first insulating piece and the second insulating piece are made of polytetrafluoroethylene materials.

Optionally, the first insulating part, the second insulating part and the connecting piece are integrally formed through an injection molding process.

The application also discloses a filter, including a plurality of syntonizers, the filter still includes foretell connection structure, connection structure sets up two between the syntonizer, or connect in the input of filter with the syntonizer, or connect in the output of filter with the syntonizer.

Compared with the scheme that a plastic insulating part is arranged between a connecting sheet and an installation seat and then the connecting sheet is locked through a plastic screw, the fixing part is made of metal materials, the connecting sheet is directly arranged between a first insulating part and a second insulating part, so that the fixing part does not directly contact with the connecting sheet after penetrating through the first insulating part and the second insulating part and being fixed on the installation seat, the fixing part indirectly forms the fixation of the connecting sheet by compressing the second insulating part and the first insulating part and fixing the second insulating part and the first insulating part on the installation seat, the fixing part made of metal materials is contacted with the first insulating part and the second insulating part made of insulating materials, the short circuit between the fixing part and the connecting sheet can not be caused, meanwhile, when the fixing part is a screw, the fixing part can be fixed through the metal screw with higher thread precision and better fixing effect, and the reject ratio of screw thread matching is reduced, the production cost is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a partial schematic diagram of a filter according to an embodiment of the present application;

FIG. 2 is a partial schematic diagram of an input terminal of a filter according to an embodiment of the present application;

fig. 3 is a schematic diagram of a connection structure of a filter of the first embodiment of the present application;

FIG. 4 is an exploded view of the first insulator, the second insulator, and the connecting tab according to the first embodiment of the present application;

fig. 5 is a schematic cross-sectional view of a connection structure of a filter according to a first embodiment of the present application;

fig. 6 is a schematic cross-sectional view of a connection structure of a filter according to a second embodiment of the present application;

fig. 7 is a schematic view of a first insulating member, a mounting base, and a connecting piece in a connecting structure according to a third embodiment of the present application.

10, a filter; 100. a connecting structure; 210. a resonator; 220. a cavity; 300. a mounting seat; 310. fixing grooves; 110. connecting sheets; 111. a first through hole; 120. a screw; 121. a groove; 131. a second through hole; 132. a second insulating member; 133. boss holes; 134. a first insulating member; 136. a boss; 150. a fixing member; 160. a limiting bulge; 161. a limiting groove; 400. a connector is provided.

Detailed Description

It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.

Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The present application is described in detail below with reference to the figures and alternative embodiments.

Fig. 1 is a partial schematic view of a filter according to an embodiment of the present invention, and as shown in fig. 1, the present application discloses a filter 10, which includes a plurality of resonators 210, and the filter 10 further includes a connection structure 100, where the connection structure 100 is disposed between two resonators 210, or connected to an input end of the filter 10 and the resonators 210, or connected to an output end of the filter 10 and the resonators 210.

Fig. 2 is a partial schematic view of the input end of the filter of this embodiment, and as shown in fig. 2, the connection structure 100 of the present application may also be connected between the input end of the filter 10 and the resonator, and between the output end of the filter 10 and the resonator 210. The output or input of the filter 10 is connected to a connector 400, and the connection structure 100 may be connected to the connector 400.

This application is through redesigning connection structure 100, wherein include the improvement to first insulating part 134 and second insulating part 132 in connection structure 100, make connection piece 110 lug connection to on first insulating part 134, and separate mounting 150 and connection piece 110 through second insulating part 132, the direct contact of mounting 150 with connection piece 110 has been avoided, when mounting 150 is screw 120, just so can adopt the screw thread precision higher, fire resistance is better, the metal screw that is difficult to take place to warp fixes, the problem of short circuit can not take place yet, the higher problem of defective rate has been solved simultaneously. The modifications to the connection structure 100 are specifically as follows:

fig. 3 is a schematic diagram of a connection structure of a filter according to a first embodiment of the present application, and as shown in fig. 3 in combination with fig. 1, the present application discloses a connection structure 100 of a filter 10, the filter 10 includes a cavity 220, the connection structure 100 is disposed in the cavity 220, the connection structure 100 includes a connection pad 110, a fixing element 150, a first insulating element 134, a second insulating element 132, and a mounting base 300, the connection pad 110 is disposed between the first insulating element 134 and the second insulating element 132, a side of the first insulating element 134 away from the connection pad 110 abuts against the mounting base 300, a side of the second insulating element 132 away from the connection pad 110 abuts against the fixing element 150, and the fixing element 150 sequentially passes through the second insulating element 132, the connection pad 110, and the first insulating element 134 and is fixedly connected in the mounting base 300; wherein, the connecting sheet 110 is not contacted with the mounting base 300 and the fixing member 150; the first insulating member 134 and the second insulating member 132 are made of insulating material, and the fixing member 150 is made of metal material.

Compared with the scheme that a plastic insulating part is arranged between the connecting piece and the mounting seat and then the connecting piece is locked through a plastic screw, the connecting piece 110 is directly arranged between the first insulating part 134 and the second insulating part 132, so that the fixing part 150 does not directly contact with the connecting piece 110 after penetrating through the first insulating part 134 and the second insulating part 132 and being fixed on the mounting seat 300, the fixing part 110 is indirectly fixed after the second insulating part 132 and the first insulating part 134 are fixed on the mounting seat 300 by compressing the second insulating part 132 and the first insulating part 134, the fixing part 150 made of metal is in contact with the first insulating part 134 and the second insulating part 132 made of insulating materials, short circuit between the fixing part 150 and the connecting piece 100 cannot be caused, when the fixing part 150 is the screw 120, the fixing part can be fixed by a metal screw with higher thread precision and better fixing effect, the reject ratio of the screw 120 in thread fit is reduced, and the production cost is reduced.

Fig. 4 is an exploded view of a first insulating member, a second insulating member, and a connecting sheet according to a first embodiment of the present disclosure, and fig. 5 is a cross-sectional view of a connection structure of a filter according to the first embodiment of the present disclosure, as shown in fig. 4 and fig. 5, the connecting sheet 110 is provided with a first through hole 111, a boss 136 is provided on a side of the first insulating member 134 away from the mounting base 300, and the connecting sheet 110 is sleeved on an outer sidewall of the boss 136 through the first through hole 111; the second insulating member 132 is provided with a second through hole 131, and the second through hole 131 corresponds to the boss 136 in position; the boss 136 is provided with a boss hole 133, the boss hole 133 penetrates through the boss 136 and the first insulating member 134 along the central line direction of the boss 136, and the mounting base 300 is provided with a fixing groove 310 at a position corresponding to the boss hole 133; the fixing member 150 includes a screw 120, and the screw 120 passes through the second through hole 131 and the boss hole 133 and is fixedly connected in the fixing groove 310; and the width of the top of the screw 120 is greater than the width of the boss hole 133.

The width of the second through hole 131 is greater than the width of the boss 136, the second insulating member 132 is sleeved on the outer side wall of the boss 136 through the second through hole 131, and the height of the boss 136 protruding the connecting piece 110 is less than or equal to the thickness of the second insulating member 132.

In the actual installation process, the first insulating member 134 is firstly placed on the installation base 300, so that the boss hole 133 of the boss 136 on the first insulating member 134 corresponds to the position of the fixing groove 310 of the installation base 300, then the connecting sheet 110 is sleeved on the outer side wall of the boss 136 through the first through hole 111 on the connecting sheet 110, then the second insulating member 132 is sleeved on the outer side wall of the portion, protruding out of the connecting sheet 110, of the boss 136 through the second through hole 131, so that the connecting sheet 110 is clamped between the second insulating member 132 and the first insulating member 134, and finally the second insulating member 132 and the first insulating member 134 are fixed on the installation base 300 through the boss hole 133 by the screw 120, so that the first insulating member 134, the second insulating member 132 and the connecting sheet 110 can be stably fixed with the installation base 300; at this moment, the screw 120 is not in direct contact with the connecting sheet 110, but directly forms extrusion with the second insulating part 132, fix the first insulating part 134 and the second insulating part 132 on the mounting base 300, so that the thread precision is higher, the metal screw with better high temperature resistance is fixed, the phenomenon of short circuit can not occur, when the metal screw is used for fixing, the precision of thread fit is improved, the untightening condition when the plastic screw is used is avoided, meanwhile, after the product is subjected to high-low temperature test, compared with the plastic screw, the metal screw is not easy to loosen, the reject ratio is reduced, the use efficiency of the product is improved, and the cost is saved.

The connecting piece 110 of the present application is a sheet structure formed by stamping and is made of a metal material. And the connection pad 110 is connected between two resonators 210, or the shape between the output and input terminals of the filter 10 and the resonators 210 may be zigzag, L-shaped, etc., without limitation. The fixing member 150 may be the screw 120 or other fixing structures, and the application only takes the fixing member 150 as the screw 120 as an example, and the screw 120 is made of at least one metal material of copper or iron. The fixing groove 310 is provided with a thread structure corresponding to the screw 120, and the screw 120 passes through the first insulating member 134 and the second insulating member 132, is screwed with the inner wall of the fixing groove 310, and is fixed in the mounting seat 300.

In addition to directly sleeving the second insulating member 132 on the boss 136 of the first insulating member 134 for fixation, an external thread may be provided on an outer sidewall of the boss 136, an internal thread may be provided on an inner sidewall of the second through hole 131, and the external thread and the internal thread are engaged to threadedly connect the second insulating member 132 with the outer sidewall of the boss 136.

The second insulating member 132 is screwed along the outer sidewall of the boss 136 by using the inner thread on the inner sidewall of the second through hole 131 and the outer thread on the outer sidewall of the boss 136 until the connecting piece 110 is pressed against the first insulating member 134, so that the second insulating member 132 and the first insulating member 134 fix the connecting piece 110 more stably, and after fixing, the second insulating member 132 and the first insulating member 134 are not easily separated from each other, and are not easily deformed, so that the connecting sheet 110 is inclined, signal transmission is affected, simultaneously, through screw-thread fit's mode, the distance between second insulating member 132 and the first insulating member 134 also can carry out nimble adjustment according to the actual thickness of connection piece 110, does not need to adjust the position of second insulating member 132 repeatedly just can realize connecting piece 110 horizontal fixation, and it is more convenient to install, has saved man-hour.

Fig. 6 is a cross-sectional view of a connection structure of a filter according to a second embodiment of the present invention, as shown in fig. 6 and fig. 4, a width of the second through hole 131 is smaller than a width of the boss 136 and is greater than or equal to a width of the boss hole 133, the second through hole 131 and the boss hole 133 are coaxially disposed correspondingly, and a height of the boss 136 is smaller than or equal to a thickness of the connection piece 110.

Different from the previous embodiment, in this embodiment, since the width of the second through hole 131 of the second insulating member 132 is smaller than the width of the boss 136, the second insulating member 132 is not sleeved on the outer sidewall of the boss 136, as long as the second through hole 131 and the boss hole 133 are ensured to be coaxially and correspondingly arranged, when the height of the boss 136 is smaller than or equal to the thickness of the connecting piece 110, at this time, when the second insulating member 132 is placed above the connecting piece 110, the second insulating member 132 is not in contact with the boss 136, but is in direct contact with the connecting piece 110, so that the connecting piece 100 is sandwiched between the first insulating member 134 and the second insulating member 132, and then the screw 120 penetrates through the second through hole 131 and the boss hole 133 to fix the second insulating member 132 and the first insulating member 134 on the mounting base 300, so that the first insulating member 134, the second insulating member 132, and the connecting piece 110 can be stably fixed with the mounting base 300, therefore, the metal screw with higher thread precision and better high-temperature resistance can be used for fixing, the short circuit phenomenon can not occur, when the metal screw is used for fixing, the precision of thread fit is improved, the situation that the plastic screw cannot be tightly screwed when being used is avoided, meanwhile, after the product is subjected to high-low temperature test, compared with the plastic screw, the metal screw is not easy to loosen, the reject ratio is reduced, the use efficiency of the product is improved, and the cost is saved.

In the present application, the first insulating member 134 and the second insulating member 132 may be disposed in an inverted manner, and are not limited in particular.

In the present application, it is preferable that the first insulating member 134 and the second insulating member 132 are made of teflon. Polytetrafluoroethylene has excellent dielectric properties and is well suited for use as a connector assembly at high radio frequencies and as an insulating material in printed circuit boards and filters 10 at microwave frequencies. And because of its high melting point, make the product difficult to take place deformation when doing the high temperature test yet, still can be fine fix connection piece 110, make connection piece 110 keep stable state, just so can not influence the transmission of signal, further promoted the stability of product. Of course, the present application does not specifically limit the material of the first insulating member 134 and the second insulating member 132, and only the first insulating member 134 and the second insulating member 132 need to be insulated, so as to prevent the connecting sheet 110, the first insulating member 134, the second insulating member 132 and the screw 120 made of metal material from being directly conducted to cause a short circuit.

The width of the top of the screw 120 is greater than the width of the second through hole 131 and less than the width of the second insulating member 132. Because the screw 120 needs to be inserted into the mounting seat 300 through the second through hole 131 of the second insulating member 132 for fixing when the second insulating member 132 and the connecting sheet 110 are fixed on the mounting seat 300, when the screw 120 continuously extends into the mounting seat 300 through threads, the top of the screw 120 gradually contacts with the upper surface of the second insulating member 132, and finally forms compression with the upper surface of the second insulating member 132, the first insulating member 134 and the second insulating member 132 are fixed on the mounting seat 300, and the width of the top of the screw 120 is greater than that of the second through hole 131, so that the screw 120 can be ensured not to fall into the second through hole 131 even if the screw 120 is excessively compressed with the upper surface of the second insulating member 132 in the continuous screwing process, the screw 120 can be more stably fixed on the second insulating member 132, and meanwhile, the contact area between the screw 120 and the second insulating member 132 is increased, so that the fixing effect between the screw 120 and the second insulating member 132 is better. In addition, the width of the top of the screw 120 is smaller than that of the second insulating member 132, so that the screw 120 has no unnecessary portion exposed outside the second insulating member 132, no space waste is caused in the limited space of the filter 10, and material is saved.

Further, a groove 121 is formed at the top of the screw 120, and the groove 121 is in a long strip shape or a quincunx shape. In order to more conveniently fix the screw 120 to the mounting seat 300 through threads, the top of the screw 120 is provided with the elongated groove 121, and in the actual mounting process, a screwdriver can be embedded into the elongated groove 121 to rotate until the screw 120 is completely and stably fixed with the first insulating member 134, the second insulating member 132 and the mounting seat 300, so that the screw 120 is more convenient to mount, and the mounting time is saved.

In addition, as shown in fig. 7, fig. 7 is a schematic view of a first insulating member, a mounting seat, and a connecting sheet in a connection structure according to a third embodiment of the present disclosure, where the embodiment shown in fig. 7 is an improvement on the basis of fig. 3, a limiting protrusion 160 or a limiting groove 161 may be further disposed on an outer sidewall of a boss 136, a limiting groove 161 or a limiting protrusion 160 is disposed on an inner wall of a corresponding first through hole 111, the limiting protrusion 160 is disposed on an outer sidewall of the boss 136, a limiting groove 161 is disposed on an inner wall of the first through hole 111 corresponding to the limiting protrusion 160, and in an actual installation process, the connecting sheet 110 is fixed by being clamped on the limiting protrusion 160 of the boss 136 through the limiting groove 161, so that the connecting sheet 110 can be effectively prevented from rotating or being displaced to affect signal transmission.

In addition, the first insulating member 134, the second insulating member 132, and the connecting piece 110 in the present application are integrally formed through an injection molding process.

When the first insulating member 134, the second insulating member 132 and the connecting sheet 110 are integrally formed, only the screw 120 needs to pass through the second through hole of the second insulating member 132 and the boss hole 133 of the first insulating member 134, and the first insulating member 134 and the second insulating member 132 are fixed on the mounting base 300, so as to indirectly fix the connecting sheet 110, and at this time, the screw 120 does not directly contact with the connecting sheet 110, but directly forms extrusion with the first insulating member 134 and the second insulating member 132, so as to fix the first insulating member 134 and the second insulating member 132 on the mounting base 300, so that a metal screw with higher thread precision and better high temperature resistance can be used for fixing, and a short circuit phenomenon can not occur, when the metal screw is used for fixing, the precision of thread fit is improved, the situation that the screw cannot be tightened when a plastic screw is used is avoided, and meanwhile, compared with the plastic screw, after the product is subjected to high and low temperature tests, the metal screw is not easy to loosen, the reject ratio is reduced, the use efficiency of the product is improved, and the cost is saved.

It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.

The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.

Claims (10)

1. A connection structure of a filter, the filter comprising a cavity, the connection structure being arranged in the cavity,

the connecting structure comprises a connecting sheet, a fixing piece, a first insulating piece, a second insulating piece and a mounting seat, wherein the connecting sheet is arranged between the first insulating piece and the second insulating piece,

one side, far away from the connecting sheet, of the first insulating piece is abutted with the mounting seat, one side, far away from the connecting sheet, of the second insulating piece is abutted with the fixing piece, and the fixing piece sequentially penetrates through the second insulating piece, the connecting sheet and the first insulating piece and is fixedly connected in the mounting seat;

wherein the connecting sheet is not in contact with the mounting seat and the fixing piece; the first insulating part and the second insulating part are made of insulating materials, and the fixing part is made of metal materials.

2. The connecting structure of the filter according to claim 1, wherein the connecting piece is provided with a first through hole, a boss is arranged on one side of the first insulating piece away from the mounting seat, and the connecting piece is sleeved on the outer side wall of the boss through the first through hole; the second insulating part is provided with a second through hole, and the second through hole corresponds to the boss in position;

the boss is provided with a boss hole, the boss hole penetrates through the boss and the first insulating piece along the center line direction of the boss, and a fixing groove is formed in the position, corresponding to the boss hole, of the mounting base;

the fixing piece comprises a screw, and the screw penetrates through the second through hole and the boss hole and is fixedly connected in the fixing groove; and the width of the top of the screw is larger than the width of the boss hole.

3. The connecting structure of the filter according to claim 2, wherein the width of the second through hole is greater than the width of the boss, the second insulating member is sleeved on the outer side wall of the boss through the second through hole, and the height of the boss protruding out of the connecting piece is less than or equal to the thickness of the second insulating member.

4. The connecting structure of filter according to claim 3, wherein the outer sidewall of the boss is provided with an external thread, the inner sidewall of the second through hole is provided with an internal thread, and the external thread and the internal thread cooperate to screw-connect the second insulating member with the outer sidewall of the boss.

5. The filter connection structure according to claim 2, wherein the width of the second through hole is smaller than the width of the boss and is greater than or equal to the width of the boss hole, the second through hole is coaxially disposed in correspondence with the boss hole, and the height of the boss is smaller than or equal to the thickness of the connection piece.

6. The connecting structure of the filter according to claim 2, wherein a limiting protrusion or a limiting groove is disposed on an outer side wall of the boss, and a limiting groove or a limiting protrusion is disposed on an inner wall of the corresponding first through hole for limiting rotation of the connecting piece.

7. The filter connecting structure according to claim 2, wherein the fixing groove is provided with a thread structure corresponding to the screw.

8. The connecting structure of filter according to claim 2, wherein the top of the screw is provided with a groove, the groove is in a long strip shape or a quincunx shape, the connecting piece is in a sheet shape formed by stamping and is made of metal material, and the first insulating member and the second insulating member are made of teflon material.

9. The connecting structure of a filter according to claim 1, wherein the first insulating member, the second insulating member and the connecting piece are integrally formed by an injection molding process.

10. A filter comprising a plurality of resonators, characterized in that the filter further comprises a connection structure according to any one of claims 1 to 9, which is arranged between two of the resonators, or is connected to an input of the filter and the resonators, or is connected to an output of the filter and the resonators.

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