CN219610712U - Filtering device - Google Patents

Abstract

The utility model belongs to the technical field of communication, and provides a filtering device which comprises a cavity, a cover plate, at least two resonant rods, a coupling piece and a coupling screw, wherein the cover plate is covered on the cavity; each resonant rod is arranged in a corresponding resonant cavity, the coupling piece is arranged between two adjacent resonant rods, the coupling screw rod penetrates through the cover plate and is arranged above the corresponding coupling piece, the coupling piece is provided with an avoidance groove for the coupling screw rod to penetrate through, and the distance between the surface of the coupling piece facing the cover plate and the cover plate is 5.1-7.1mm so as to reduce the height of the coupling piece. The avoidance groove for the coupling screw to penetrate is formed in the coupling piece, so that a larger coupling adjusting range is achieved, meanwhile, short circuits caused by contact between the coupling screw and the coupling piece can be avoided, the distance between the coupling piece and the cover plate is set between 5.1mm and 7.1mm, the height of the coupling piece can be reduced, the coupling degree is improved to a certain extent, and short circuits caused by contact between the coupling piece and the coupling screw are avoided.

Description

Filtering device

Technical Field

The utility model belongs to the technical field of communication, and particularly relates to a filtering device.

Background

Filters are widely used as a frequency selective device in the field of communications, particularly radio frequency communications. In a base station where signal transmission and reception are completed in a communication system, a filter is used to select a communication signal and filter clutter or interference signals outside the frequency of the communication signal, and currently, in a mobile communication base station system, a cavity filter is generally used to perform frequency selection on signals transmitted and received by an antenna.

In the cavity filter of the related art, coupling ribs are generally arranged between two adjacent resonant rods to adjust coupling strength, and the coupling strength between the two adjacent resonant rods is adjusted by adjusting the distance between a coupling screw above the coupling ribs and the coupling ribs.

Disclosure of Invention

The embodiment of the utility model aims to provide a filtering device to solve the technical problems that the coupling adjusting range between a coupling rib and a coupling screw is small and short circuit is easy to occur due to the fact that an existing cavity filter adopts a straight coupling rib.

In order to achieve the above purpose, the utility model adopts the following technical scheme: there is provided a filtering apparatus including:

the cavity is provided with at least two resonant cavities;

the cover plate is covered on the cavity;

at least two resonant rods, each resonant rod is arranged in the corresponding resonant cavity;

the coupling piece is arranged between two adjacent resonant rods; and

the coupling screw rod penetrates through the cover plate and is arranged above the corresponding coupling piece;

the coupling piece is provided with an avoidance groove for the coupling screw to penetrate through, and the distance between the surface of the coupling piece, which faces the cover plate, and the cover plate is 5.1mm-7.1mm so as to reduce the height of the coupling piece.

Optionally, the coupling comprises:

the main body part is provided with the avoidance groove, the main body part is provided with a first surface, the first surface faces towards the corresponding resonant rod, and the distance between the first surface and the corresponding resonant rod is 1.5mm-2 mm.

Optionally, the main body portion further has a second surface, the second surface being contiguous with the first surface, a distance between the second surface and an inner sidewall of the cavity being greater than or equal to 2mm.

Optionally, the shape of dodging the groove is polygonal structure, dodge the groove width of groove and be 1mm-2mm, dodge the groove length of groove and be 1mm-2mm.

Optionally, the main body part is also of a polygonal structure, the shape of the main body part is the same as that of the avoidance groove, the wall thickness of the main body part is uniform, and the wall thickness of the main body part is between 1mm and 2mm.

Optionally, at least two of the resonant rods are a first resonant rod and a second resonant rod, respectively, and the coupling further comprises:

a first connecting portion connected between the main body portion and the first resonance lever; and

a second connecting portion connected between the main body portion and the second resonance lever;

the main body part, the first connecting part, the second connecting part and the cavity are of an integrated structure.

Optionally, the filtering device further includes:

the first bulge extends from the top wall of the first connecting part towards the direction of the cover plate, and the first resonance rod is sleeved on the first bulge and is connected with the first connecting part; and

and a first fastener passing through the first resonant rod and connected with the first protrusion.

Optionally, the first protrusion and the first connection portion are integrally formed, and the first resonant rod and the first connection portion are in a split structure.

Optionally, the filtering device further includes:

the second bulge extends from the top wall of the second connecting part towards the direction of the cover plate, and the second resonance rod is sleeved on the second bulge and is connected with the second connecting part; and

and a second fastener passing through the second resonance rod and connected with the second protrusion.

Optionally, the second protrusion and the second connection portion are integrally formed, and the second resonant rod and the second connection portion are in a split structure.

The filter device provided by the utility model has the beneficial effects that: through offer the dodge groove that supplies coupling screw rod to wear to establish on the coupling piece to make the coupling screw rod penetrate the coupling piece through dodging the notch in groove, at the in-process of wearing to establish, coupling screw rod and coupling piece can the partial coincidence that corresponds, thereby increased the coupling area between coupling screw rod and the coupling piece, realized bigger coupling accommodation. Meanwhile, the short circuit caused by contact between the coupling screw and the coupling piece in the insertion and adjustment process can be avoided, the adjustment allowance of the coupling screw is increased, the debugging difficulty is reduced, and the production passing rate is improved; further, by setting the distance between the surface of the coupling piece facing the cover plate and the cover plate to be 5.1mm-7.1mm, the coupling degree can be improved, and meanwhile, the short circuit caused by contact between the coupling screw and the coupling piece can be avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic cross-sectional structure of a filtering apparatus provided in the related art;

fig. 2 is a schematic perspective view of a filtering device according to an embodiment of the present utility model;

fig. 3 is an exploded view of a filter device according to an embodiment of the present utility model;

fig. 4 is a schematic cross-sectional structure of a filtering device according to an embodiment of the present utility model;

fig. 5 is a schematic perspective view of a cavity, a resonant rod and a coupling member according to an embodiment of the present utility model;

FIG. 6 is a schematic top view of a cavity, a resonant rod and a coupling member according to an embodiment of the present utility model;

FIG. 7 is a schematic diagram illustrating simulation of coupling degree of a coupling member according to an embodiment of the present utility model;

fig. 8 is a simulation diagram of the coupling degree of the coupling member used in the related art.

Wherein, each reference sign in the figure:

11' -coupling ribs; 12' -cover plate; 13' -cavity; 14' -coupling screw;

10-a cavity; 11-a resonant cavity;

20-cover plate;

30-a resonant rod; 31-a first resonant rod; 32-a second resonant rod;

40-coupling; 41-a main body portion; 410-avoiding grooves; 411-a first surface; 412-a second surface; 42-a first connection; 43-a second connection;

50-coupling screws;

61-a first bump; 62-a second bump; 63-a first fastener; 64-a second fastener;

70-tuning a screw; 71-a first tuning screw; 72-a second tuning screw;

81-a first fastening nut; 82-a second fastening nut.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 2, a filtering device provided by an embodiment of the present utility model will now be described. The filtering device is a cavity filter, and the cavity filter is used as a frequency selecting device, so that signals of external equipment can be transmitted to the cavity filter, and of course, signals of the cavity filter can also be transmitted to the external equipment.

Specifically, with further reference to fig. 3 and fig. 4, the filtering device includes a cavity 10, a cover plate 20, at least two resonant rods 30, a coupling member 40 and a coupling screw 50, wherein an opening is formed in the cavity 10, and the cover plate 20 is covered on the opening side of the cavity 10; at least two resonant cavities 11 are further arranged in the cavity 10, each resonant rod 30 is arranged in a corresponding resonant cavity 11, namely one resonant rod is arranged in one resonant cavity, and in order to realize the mutual coupling of a plurality of resonant cavities 11, the coupling pieces 40 are required to be arranged between two adjacent resonant rods 30 for coupling, namely, the coupling pieces 40 are arranged between the two adjacent resonant rods 30. Of course, the coupling element 40 may be disposed between two non-adjacent resonant rods 30, and may be capable of mainly forming coupling between the resonant cavities 11; the coupling screw 50 passes through the cover plate 20 and is disposed above the corresponding coupling member 40. The coupling piece 40 is provided with the avoidance groove 410 for the coupling screw 50 to penetrate through, so that the coupling screw 50 can penetrate into the coupling piece 40 through the notch of the avoidance groove 410, and the coupling screw 50 and the coupling piece 40 are partially overlapped, so that the coupling area between the coupling screw 50 and the coupling piece 40 is increased, a larger coupling adjusting range is realized, and meanwhile, the coupling screw 50 and the coupling piece 40 can be prevented from being in contact to cause short circuit.

Further, the distance L1 between the surface of the coupling member 40 facing the cover plate 20 and the cover plate 20 is between 5.1mm and 7.1mm, and in a specific application, the distance L1 between the surface of the coupling member 40 facing the cover plate 20 and the cover plate 20 is 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6.0mm, 6.1mm, 6.2mm, 6.3mm, 6.4mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7.0mm or 7.1mm, which may be selected according to specific requirements, and is not limited herein. Because the space in the cavity 10 is limited, under the condition of realizing the same bandwidth, the height of the coupling piece 40 can be set lower, the coupling strength is higher, the phenomenon that the distance between the coupling piece 40 and the cover plate 20 is too large, so that the coupling piece 40 is too low in height, the mutual coupling between the coupling piece 40 and the coupling screw 50 is influenced due to the too low height of the coupling piece 40, and meanwhile, the phenomenon that the coupling piece 40 is too high due to the too small distance L1 between the coupling piece 40 and the cover plate 20, and the coupling piece 40 and the coupling screw 50 are easily contacted to be short-circuited is avoided. Referring specifically to the frequency-coupling simulation diagram of fig. 7, simulation was performed with the distances L1 between the coupling 40 and the cover plate 20 being 5.1mm, 6.1mm, and 7.1mm, respectively, the coupling was 200.38dB when L1 was 5.1mm, 147.52dB when L1 was 6.1mm, 114.52dB when L1 was 7.1mm, and the coupling was improved to some extent, and short-circuiting due to easy contact between the coupling 40 and the coupling screw 50 was avoided.

It should be noted that, referring to fig. 1, in order to meet a certain coupling bandwidth requirement, the height of the coupling rib 11' is generally higher, and due to the limited internal space of the cavity filter, when the height of the coupling rib 11' is higher, the distance between the coupling rib 11' and the cover plate 12' is somewhat shorter, wherein the distance L2 between the coupling rib 11' and the cover plate 12' is between 1 and 3mm, which results in that the coupling screw 14' is easily contacted with the coupling rib 11' in the process of inserting and adjusting, and the adjusting margin is smaller, which increases the debugging difficulty, and affects the debugging of the cavity filter, in particular, referring to a frequency-coupling degree simulation diagram of fig. 8, the simulation diagram is implemented by using the distances L2 between the coupling rib 11' and the cover plate 12' of 1mm, 2mm and 3mm, when the frequency is 3.6GHz, the coupling degree is 224.26dB, when the L2 is 2mm, the coupling degree is 146.36dB, when the L2 is 3 dB, the coupling degree is 3 dB, which results in that the coupling screw 14' is easily contacted with the coupling screw 11', and the coupling screw is easily contacted with the coupling screw 11', which results in the short-coupling screw.

As can be seen from comparing the data in fig. 7 and fig. 8, when the coupling degree is close, for example, the coupling degree ranges from 200dB to 225dB, the distance between the coupling element 40 and the cover plate 20 provided by the present utility model can be 5.1mm, while the distance between the coupling rib 11 'and the cover plate 12' in the related art needs to be 1mm to meet the strength requirement of the coupling degree; for example, when the coupling degree ranges from 146dB to 148dB, the distance between the coupling element 40 and the cover plate 20 provided by the utility model can be 6.1mm, and the distance between the coupling rib 11 'and the cover plate 12' in the related art needs to be 2mm to meet the strength requirement of the coupling degree; for example, when the coupling degree ranges from 107dB to 115dB, the distance between the coupling element 40 and the cover plate 20 provided by the present utility model can be 7.1mm, while the distance between the coupling rib 11 'and the cover plate 12' in the related art needs to be 3mm to meet the strength requirement of the coupling degree. In summary, under the same requirement of the coupling degree, the distance between the coupling piece 40 and the cover plate 20 can be relatively increased by adopting the design of the utility model, in other words, under the same requirement of the coupling piece 40 and the cover plate 20, the coupling degree can be relatively increased by adopting the design of the utility model, so that the coupling degree is improved to a certain extent by setting the distance between the surface of the coupling piece 40 facing the cover plate 20 and the cover plate 20 to be 5.1mm-7.1mm and arranging the avoiding groove 410 on the coupling piece 40, and the short circuit caused by easy contact between the coupling piece 40 and the coupling screw 50 is avoided.

According to the filtering device provided by the embodiment of the utility model, the avoidance groove 410 for the coupling screw 50 to penetrate is formed in the coupling piece 40, so that the coupling screw 50 can penetrate into the coupling piece 40 through the notch of the avoidance groove 410, and in the penetrating process, the coupling screw 50 and the coupling piece 40 can be partially overlapped correspondingly, so that the coupling area between the coupling screw 50 and the coupling piece 40 is increased, and a larger coupling adjustment range is realized. Meanwhile, the short circuit caused by the contact between the coupling screw 50 and the coupling piece 40 in the insertion and adjustment process can be avoided, the adjustment allowance of the coupling screw 50 is increased, the debugging difficulty is reduced, and the production passing rate is improved; further, by setting the distance between the surface of the coupling member 40 facing the cap plate 20 and the cap plate 20 to be 5.1mm to 7.1mm, the height of the coupling member 40 itself can be reduced, and the coupling degree can be improved while avoiding short-circuiting by easy contact between the coupling member 40 and the coupling screw 50.

It will be appreciated that the relief groove 410 may be a through hole structure extending through two opposing surfaces of the coupling member 40, wherein the two opposing surfaces may be upper and lower surfaces, as shown in fig. 3 and 5, such that the coupling member 40 forms two double ribs disposed parallel to each other. Of course, the relief groove 410 may be a notch extending through two opposing surfaces of the coupler 40, and through one or more sides of the coupler 40, such as a notch, so that the coupler 40 forms a double rib that is spaced apart from one another. Of course, the avoiding groove 410 may be a blind hole structure penetrating only the surface of the coupling member 40 facing the cover plate 20, so that two parallel double ribs are formed at one end of the coupling member 40 facing the cover plate 20, and a linear rib is formed at one end of the coupling member 40 facing away from the cover plate 20.

In an embodiment of the present utility model, referring to fig. 5 and fig. 6 together, the coupling element 40 includes a main body 41, and the main body 41 is provided with a recess 410, wherein the main body 41 has a first surface 411, the first surface 411 is disposed towards the corresponding resonant rod 30, and a distance L3 between the first surface 411 and the corresponding resonant rod 30 is between 1.5mm and 2mm. In a specific application, the distance L3 between the first surface 411 and the corresponding resonant rod 30 is 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, and 2.0mm, and setting the distance L3 between the first surface 411 and the corresponding resonant rod 30 in the above range can achieve a higher coupling degree, and avoid too close to the resonant rod 30 to cause too sensitive coupling between the resonant rod 30 and the main body 41, thereby affecting the purpose of adjusting the coupling degree by adjusting the depth of the coupling screw 50 extending into the coupling member 40, that is, increasing the debugging difficulty, and avoiding too far from the resonant rod 30 to have a lower coupling degree.

Illustratively, referring to fig. 6, at least two resonant rods 30 are a first resonant rod 31 and a second resonant rod 32, respectively, the main body 41 has two oppositely disposed first surfaces 411, one of the first surfaces 411 is disposed toward the first resonant rod 31 with a spacing between the first surface 411 and the first resonant rod 31 of between 1.5mm and 2mm, the other first surface 411 is disposed toward the second resonant rod 32 with a spacing between the first surface 411 and the second resonant rod 32 of between 1.5mm and 2mm.

Further, referring to fig. 6, the main body 41 further has a second surface 412, where the second surface 412 is adjacent to the first surface 411, that is, the second surface 412 is disposed avoiding the first surface 411, specifically referring to fig. 6, the main body 41 in this embodiment exemplarily adopts a cuboid structure, where the main body 41 of the cuboid structure has four sides, two oppositely disposed sides are disposed corresponding to the resonant rod 30, the surfaces of the two sides facing the resonant rod 30 are the first surface 411, and the other two oppositely disposed sides are disposed avoiding the resonant rod 30, that is, the outer surfaces of the two sides are disposed directly facing the inner side wall of the cavity 10, where the outer surfaces of the two sides are the second surface 412, and a distance L4 between the second surface 412 and the inner side wall of the cavity 10 is greater than or equal to 2mm, so that the cavity 10 having the coupling member 40 can be conveniently manufactured while ensuring the coupling degree.

The coupling member 40 and the cavity 10 are integrally formed, for example, by die casting, machining, stretching, or other methods. In the case where the window space of the cavity 10 is limited, the larger the distance L4 between the second surface 412 and the inner side wall of the cavity 10, the narrower the width of the body portion 41, and the lower the coupling strength between the body portion 41 and the resonance lever 30; the distance L4 between the second surface 412 and the inner sidewall of the cavity 10 is too small to affect the manufacture of the cavity 10, for example, when the coupling member 40 and the cavity 10 are die-cast by a die, the die for manufacturing the cavity 10 is easily damaged during the die-casting.

In one embodiment of the present utility model, referring to fig. 6, the shape of the avoidance groove 410 is a polygonal structure, and the shape of the avoidance groove 410 may be a regular polygon, a rectangle or other irregular polygonal structures, where an irregular polygon refers to that there is no relationship between sides and no relationship between corners. The avoiding groove 410 in this embodiment may be a circular, rectangular, square, regular pentagon or other regular polygon structure, so long as the coupling screw 50 can extend into the main body 41 through the avoiding groove 410.

Wherein, the groove width W of the avoidance groove 410 is between 1mm and 2mm, and the groove length L5 of the avoidance groove 410 is between 1mm and 2mm, and in specific applications, the groove width W of the avoidance groove 410 is 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm, and the groove length L5 of the avoidance groove 410 is 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm, so as to facilitate the molding of the coupling member 40 and the cavity 10. For example, when the coupling member 40 and the cavity 10 are die-cast by a mold, the mold is facilitated to form the relief groove 410 with the above-mentioned dimensions, if the groove width W and the groove length L5 of the relief groove 410 are too small, the mold is easily damaged, and if the groove width W and the groove length L5 of the relief groove 410 are too large, sand holes are formed in the cavity 10 and the coupling member 40, and the quality of the die-cast molding is poor.

When the shape of the avoiding groove 410 is circular, the groove width W and the groove length L5 of the avoiding groove 410 are equal, and the groove width W and the groove length L5 of the avoiding groove 410 are both the diameters of the circular avoiding groove 410;

when the shape of the avoidance groove 410 is rectangular, the groove width W of the avoidance groove 410 refers to the short side of the rectangle, and the groove length L5 of the avoidance groove 410 refers to the long side of the rectangle;

when the shape of the avoiding groove 410 is square, the groove width W and the groove length L5 of the avoiding groove 410 are equal, and the groove width W and the groove length L5 of the avoiding groove 410 are both square side lengths;

when the shape of the avoidance groove 410 is a regular pentagon, the groove width W and the groove length L5 of the avoidance groove 410 are equal, and the groove width W and the groove length L5 of the avoidance groove 410 are both the diameters of the circumscribed circles of the regular pentagon.

In an embodiment of the present utility model, referring to fig. 5 and 6, the main body 41 is also polygonal, that is, the shape of the main body 41 may be regular polygon, rectangle or other irregular polygonal structure, so long as the wall thickness of the main body 41 is uniform. For example, the main body 41 in the present embodiment has a circular, rectangular, square, regular pentagonal or other regular polygonal structure, and the shape of the main body 41 is the same as that of the relief groove 410, so that the wall thickness of the main body 41 is uniform, thus facilitating the processing of the coupling 40.

In particular, the wall thickness of the body portion 41 is between 1mm and 2mm, and in particular applications the wall thickness of the body portion 41 is 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm, and may be selected according to particular requirements. The wall thickness of the main body 41 is between 1mm and 2mm, and the shape of the main body 41 is the same as that of the avoidance groove 410, so that the wall thickness of the main body 41 is uniform, and the loss of electromagnetic waves when the electromagnetic waves pass through the coupling piece 40 is small, thereby being more beneficial to the index stability of the filtering device.

Further, with reference to fig. 3 and 4, the coupling member 40 further includes a first connecting portion 42 and a second connecting portion 43, where the first connecting portion 42 is connected between the main body portion 41 and the first resonant rod 31, and the first connecting portion 42 can be electrically connected to the first resonant rod 31 through contact, and of course, can also be sleeved on the first resonant rod 31 to realize an electrical connection relationship; the second connection portion 43 is connected between the main body 41 and the second resonant rod 32, and the second connection portion 43 may be electrically connected to the second resonant rod 32 by contacting, or may be sleeved on the second resonant rod 32 to achieve an electrical connection relationship.

Wherein, the first connection part 42 and the second connection part 43 are protruded at the inner bottom wall of the cavity 10, and the coupling strength between the first resonance rod 31 and the second resonance rod 32 can be further increased on the basis that the coupling member 40 increases the coupling degree between the first resonance rod 31 and the second resonance rod 32.

It should be noted that, in the present embodiment, the main body portion 41, the first connecting portion 42, the second connecting portion 43 and the cavity 10 are integrally formed, so that the coupling member 40 and the cavity 10 can be manufactured conveniently, and the coupling member 40 and the cavity 10 can be directly integrally formed by die casting, machining or the like, and the strength of the joint of the coupling member 40 and the cavity 10 is high.

Of course, in other embodiments, the main body 41, the first connecting portion 42, the second connecting portion 43 and the cavity 10 are in a split structure and are connected together by assembling, so that the coupling member 40 is convenient to be detached for replacement.

In an embodiment of the present utility model, referring to fig. 3 and 4, the resonant rod 30 and the cavity 10 are in a split structure, in order to fix the resonant rod 30, the filter device further includes a first protrusion 61 and a first fastener 63, the first protrusion 61 extends from a top wall of the first connecting portion 42 toward the cover 20, the top wall refers to a surface of the first connecting portion 42 toward the cover 20, the first resonant rod 31 is sleeved on the first protrusion 61 and contacts with the first connecting portion 42, and the first fastener 63 passes through the first resonant rod 31 and then is connected with the first protrusion 61, so as to fix the first resonant rod 31 on the first protrusion 61.

It should be noted that, the first protrusion 61 and the first connection portion 42 are integrally formed, and the first resonant rod 31 and the first connection portion 42 are separate structures, so that the first resonant rod 31 is fixed on the cavity 10 when the first fastener 63 fixes the first resonant rod 31 on the first protrusion 61.

Of course, in other embodiments, the first protrusion 61 and the first connection portion 42 may be separate structures, and then the first fastener 63 sequentially passes through the first resonant lever 31 and the first protrusion 61 and is connected to the first connection portion 42.

Since the first connecting portion 42 is protruding on the inner bottom wall of the cavity 10, the first resonant rod 31 is sleeved on the first protrusion 61 and contacts with the first connecting portion 42, so that the bottom current distribution of the resonant rod 30 is more uniform, and the passive intermodulation performance of the filtering device is prevented from being degraded due to the fact that the bottom current of the resonant rod 30 is too concentrated when the resonant rod 30 directly contacts with the inner bottom wall of the cavity 10.

In an embodiment of the present utility model, referring to fig. 3 and 4, the resonant rod 30 and the cavity 10 are in a split structure, in order to fix the resonant rod 30, the filter device further includes a second protrusion 62 and a second fastening member 64, the second protrusion 62 extends from a top wall of the second connecting portion 43 toward the cover 20, the top wall refers to a surface of the second connecting portion 43 facing the cover 20, the second resonant rod 32 is sleeved on the second protrusion 62 and contacts with the second connecting portion 43, and the second fastening member 64 passes through the second resonant rod 32 and then is connected with the second protrusion 62, so as to fix the second resonant rod 32 on the second protrusion 62.

It should be noted that, the second protrusion 62 and the second connecting portion 43 are integrally formed, and the second resonant rod 32 and the second connecting portion 43 are separate structures, so that the second resonant rod 32 is fixed on the cavity 10 when the second fastener 64 fixes the second resonant rod 32 on the second protrusion 62.

Of course, in other embodiments, the second protrusion 62 and the second connecting portion 43 may be separate structures, and then the second fastener 64 sequentially passes through the second resonant rod 32 and the second protrusion 62 and is connected to the second connecting portion 43.

Since the second connecting portion 43 is convexly arranged on the inner bottom wall of the cavity 10, and the second resonant rod 32 is sleeved on the second protrusion 62 and is in contact with the second connecting portion 43, the bottom current distribution of the resonant rod 30 is more uniform, and the phenomenon that the passive intermodulation performance of the filtering device is deteriorated due to too concentrated bottom current of the resonant rod 30 when the resonant rod 30 is directly in contact with the inner bottom wall of the cavity 10 is avoided.

In an embodiment of the present utility model, referring to fig. 3 and 4, the filtering apparatus further includes at least two tuning screws 70, each tuning screw 70 is disposed corresponding to the resonant rod 30, and each tuning screw 70 is disposed through the cover 20 and extends to the interior of the cavity 10, so as to be capable of tuning in cooperation with the resonant rod 30.

Specifically, at least two tuning screws 70 are respectively a first tuning screw 71 and a second tuning screw 72, the position of the first tuning screw 71 corresponds to the position of the first tuning rod 63, and the first tuning screw 71 is in threaded connection with the cover plate 20 and passes through the cover plate 20 to be matched with the first resonance rod 31; the second tuning screw 72 is positioned corresponding to the second resonant rod 32, and the second tuning screw 72 is screwed to the cover plate 20 and is coupled to the second resonant rod 32 through the cover plate 20.

Further, the filtering device further comprises a first fastening nut 81 and a second fastening nut 82, wherein the first fastening nut 81 is screwed on one end of the tuning screw 70, which is exposed out of the cover plate 20, and the second fastening nut 82 is screwed on one end of the coupling screw 50, which is exposed out of the cover plate 20.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. A filtering device, characterized by: comprising the following steps:

the cavity is provided with at least two resonant cavities;

the cover plate is covered on the cavity;

at least two resonant rods, each resonant rod is arranged in the corresponding resonant cavity;

the coupling piece is arranged between two adjacent resonant rods; and

the coupling screw rod penetrates through the cover plate and is arranged above the corresponding coupling piece;

the coupling piece is provided with an avoidance groove for the coupling screw to penetrate through, and the distance between the surface of the coupling piece, which faces the cover plate, and the cover plate is 5.1mm-7.1mm so as to reduce the height of the coupling piece.

2. The filtering apparatus of claim 1, wherein: the coupling includes:

the main body part is provided with the avoidance groove, the main body part is provided with a first surface, the first surface faces towards the corresponding resonant rod, and the distance between the first surface and the corresponding resonant rod is 1.5mm-2 mm.

3. The filtering apparatus of claim 2, wherein: the body portion also has a second surface that is contiguous with the first surface, a distance between the second surface and an inner sidewall of the cavity being greater than or equal to 2mm.

4. A filter arrangement as claimed in claim 2 or 3, characterized in that: the shape of dodging the groove is polygonal structure, dodge the groove width of groove and be 1mm-2mm, dodge the groove length of groove and be 1mm-2mm.

5. The filtering apparatus of claim 4, wherein: the main body part is also of a polygonal structure, the shape of the main body part is the same as that of the avoidance groove, the wall thickness of the main body part is uniform, and the wall thickness of the main body part is 1mm-2mm.

6. A filter arrangement as claimed in claim 2 or 3, characterized in that: at least two resonance bars are first resonance bar and second resonance bar respectively, the coupling piece still includes:

a first connecting portion connected between the main body portion and the first resonance lever; and

a second connecting portion connected between the main body portion and the second resonance lever;

the main body part, the first connecting part, the second connecting part and the cavity are of an integrated structure.

7. The filtering apparatus of claim 6, wherein: the filtering device further includes:

the first bulge extends from the top wall of the first connecting part towards the direction of the cover plate, and the first resonance rod is sleeved on the first bulge and is connected with the first connecting part; and

and a first fastener passing through the first resonant rod and connected with the first protrusion.

8. The filtering apparatus of claim 7, wherein: the first bulge and the first connecting part are of an integrated structure, and the first resonant rod and the first connecting part are of a split structure.

9. The filtering apparatus of claim 6, wherein: the filtering device further includes:

the second bulge extends from the top wall of the second connecting part towards the direction of the cover plate, and the second resonance rod is sleeved on the second bulge and is connected with the second connecting part; and

and a second fastener passing through the second resonance rod and connected with the second protrusion.

10. The filtering apparatus of claim 9, wherein: the second bulge and the second connecting part are of an integrated structure, and the second resonance rod and the second connecting part are of a split structure.