CN112670684A - Cavity filter, cover plate thereof and communication equipment - Google Patents
Cavity filter, cover plate thereof and communication equipment Download PDFInfo
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- CN112670684A CN112670684A CN201910980368.1A CN201910980368A CN112670684A CN 112670684 A CN112670684 A CN 112670684A CN 201910980368 A CN201910980368 A CN 201910980368A CN 112670684 A CN112670684 A CN 112670684A
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- cover plate
- cavity filter
- plastic body
- cavity
- plastic
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Abstract
The invention provides a cavity filter, a cover plate thereof and communication equipment comprising the cavity filter. According to the cavity filter, the cover plate and the communication equipment comprising the cavity filter, provided by the invention, the part, matched with the tuning screw, on the cover plate is designed to be made of the plastic material, so that the production cost and the product weight of the cover plate can be reduced, and no debris is generated.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a cavity filter, a cover plate of the cavity filter and communication equipment comprising the cavity filter.
Background
In a base station system for mobile communication, communication signals carrying communication data in a specific frequency range are generally transmitted through a transmitting antenna, and the communication signals are received through a receiving antenna. The signal received by the receiving antenna contains not only the communication signal carrying the communication data within the specific frequency range, but also a number of spurious or interfering signals outside the specific frequency range. To obtain a communication signal carrying communication data in a specific frequency range transmitted by a transmitting antenna from a signal received by a receiving antenna, the signal received by the receiving antenna is usually filtered by a cavity filter, so as to filter out noise or interference signals outside the specific frequency of the communication signal carrying communication data.
The cavity filter is widely used as a frequency selection device. In the prior art, a cavity filter includes a cavity, a cover plate, a resonant rod, and a tuning screw, wherein the cover plate covers the cavity to form a resonant cavity, the resonant rod is fixed on the bottom surface of the cavity by a screw, and the tuning screw extends into the resonant rod to adjust radio frequency parameters.
The cover plate of the existing cavity filter is generally formed by a metal plate through multiple processes of die casting, stamping, machining, grinding, silver electroplating and the like, and the manufacture is relatively inefficient and time-consuming.
The metal material cost is higher, the product is heavier, the processing difficulty is big, the product leakproofness is influenced because the deformation that the metal heat conduction efficiency is good and the easy production is not required during the welding, and the silver-plating in the screw hole on the metal cover plate can take place to drop and lead to the piece to fall into the cavity and cause the product index bad when tuning screw and apron are closed soon.
Disclosure of Invention
The invention provides a cavity filter, a cover plate thereof and communication equipment comprising the cavity filter, and aims to solve the technical problem that silver plating in a threaded hole on a metal cover plate in the prior art can fall off when a tuning screw and the cover plate are screwed together, and fragments fall into a cavity to cause poor product indexes.
In order to solve the technical problems, the invention adopts a technical scheme that: the cover plate of the cavity filter comprises a plastic body and a conductive layer attached to the surface of the plastic body.
According to an embodiment of the present invention, the conductive layer is a silver plating layer and is attached to one surface of the plastic body.
According to an embodiment of the present invention, the plastic body is formed by injection molding.
According to an embodiment of the present invention, the plastic body is provided with a tuning screw hole penetrating through the plastic body in a thickness direction.
According to an embodiment of the present invention, the plastic body is distributed with a plurality of fixing holes.
According to an embodiment of the present invention, the plastic body is made of PEI.
According to an embodiment of the present invention, the plastic body is doped with glass fibers.
According to an embodiment of the present invention, the ratio of the glass fiber in the plastic body is 5% to 10%.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a cavity filter comprising:
a cavity;
the cover plate covers the cavity in a welding mode or a screw fixing mode.
In order to solve the technical problems, the invention adopts a technical scheme that: a communication device is provided, which includes the cavity filter, and the communication device is at least one of a duplexer, a simplex, a splitter, a combiner, or a tower top amplifier.
The invention has the beneficial effects that: different from the prior art, the cavity filter, the cover plate thereof and the communication equipment comprising the cavity filter provided by the invention have the advantages that the part of the cover plate, which is matched with the tuning screw, is designed to be the plastic material, so that the production cost and the product weight of the cover plate can be reduced, and no debris is generated.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic partial sectional view of a cover plate of a cavity filter according to a first embodiment of the present invention;
fig. 2 is a schematic top view of a cover plate of a cavity filter according to a first embodiment of the present invention;
fig. 3 is a schematic partial sectional view of a cover plate of a cavity filter according to a second embodiment of the present invention;
fig. 4 is a schematic top view of a cover plate of a cavity filter according to a second embodiment of the present invention;
fig. 5a to 5c are schematic diagrams illustrating variations of the cover plate of the cavity filter according to the second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 and fig. 2 together, fig. 1 is a schematic partial cross-sectional structure diagram of a cover plate of a cavity filter according to a first embodiment of the present invention, and fig. 2 is a schematic top-view structure diagram of the cover plate of the cavity filter according to the first embodiment of the present invention.
The first embodiment of the present invention provides a cover plate 100 of a cavity filter, wherein the cover plate 100 of the cavity filter includes a plastic body 110 and a conductive layer (not shown) attached to a surface of the plastic body 110.
The conductive layer can be a silver plating layer and is attached to a surface of the plastic body 110, the surface is a surface facing the cavity (not shown) (i.e., an inner surface that is fastened with the cavity in a use state), and of course, the silver plating layer can also be replaced by other materials with better conductive performance.
In the embodiment of the invention, the plastic body 110 can be directly formed by injection molding, the processing technology formed by injection molding is simple, efficient and convenient, the material cost is low, the product weight is reduced, and the sealing performance of the cavity filter product is easily ensured because the plastic has poor thermal conductivity and is not easy to deform during welding.
The plastic body 110 is provided with a tuning screw hole 112 penetrating through the thickness direction of the plastic body 110, the tuning screw hole 112 can be directly formed by injection molding or formed by a subsequent tapping mode, the tuning screw hole 112 is used for being spirally matched with the tuning screw 130, and the plastic body 110 is further provided with a nut 140 matched with the tuning screw 130.
In this embodiment, the plastic body 110 is further provided with a plurality of fixing holes 114, the fixing holes 114 can be directly formed by injection molding, the fixing holes 114 are used for the fixing screws 150 to pass through, the fixing screws 150 are used for fixing the cover plate 100 on the cavity, and correspondingly, the cavity is provided with a plurality of receiving holes for receiving the fixing screws 150 to be screwed in.
In this embodiment, the plastic body 110 is made of PEI (Polyetherimide), wherein the plastic body 110 is doped with glass fibers, the ratio of the glass fibers in the plastic body 110 is 5% to 10%, and the glass fibers can improve the mechanical strength of the plastic body 110 and the service life of the plastic body 110.
The invention also provides a cavity filter, which comprises a cavity and the cover plate 100, wherein the cover plate 100 covers the cavity in a welding mode or a screw fixing mode.
The invention also provides communication equipment, which comprises the cavity filter, wherein the communication equipment is at least one of a duplexer, a simplex, a splitter, a combiner or a tower amplifier.
Referring to fig. 3 to 5c, fig. 3 is a schematic partial cross-sectional structure view of a cover plate of a cavity filter according to a second embodiment of the present invention; fig. 4 is a schematic top view of a cover plate of a cavity filter according to a second embodiment of the present invention; fig. 5a to 5c are schematic diagrams illustrating variations of the cover plate of the cavity filter according to the second embodiment of the present invention.
The second embodiment of the present invention provides a cover plate 200 of a cavity filter, the cover plate 200 of the cavity filter includes a metal body 210 and a plastic member 220 disposed in the metal body 210, the plastic member 220 is used for disposing a tuning screw hole 222.
Wherein, plastic part 220 accessible injection moulding mode directly forms, and the processing technology who adopts the mode of moulding plastics to form is simple, high-efficient, convenient, and tuning screw 222 accessible injection moulding directly forms, or forms through subsequent tapping mode, and tuning screw 222 is used for with tuning screw 230 screw fit, further is equipped with on the plastic part 220 with tuning screw 230 complex nut 240.
In this embodiment, a plurality of fixing holes 216 are further distributed on the metal body 210, the fixing holes 216 may be directly formed by injection molding or formed by a subsequent drilling process, the fixing holes 216 are used for allowing the fixing screws 250 to pass through, the fixing screws 250 are used for fixing the cover plate 200 on a cavity (not shown), and correspondingly, the cavity is provided with a plurality of receiving holes for receiving the fixing screws 250 to be screwed in.
The plastic part 220 may be directly formed in the metal body 210 by injection molding. Alternatively, the plastic part 220 may be formed in the metal body 210 by an extrusion insert method.
Specifically, the metal body 210 is provided with a plastic mounting hole 212 penetrating through the metal body 210 in the thickness direction, and the plastic member 220 is disposed in the plastic mounting hole 212.
Preferably, the plastic setting hole 212 has a certain limit function for the plastic part 220, and the plastic setting hole 212 may be in a step hole shape, and includes an axial annular wall 213, an annular table wall 214 vertically connected to the axial annular wall 213, and a conical annular wall 215 connected to the annular table wall 214 at an acute angle, wherein an included angle between the annular table wall 214 and the conical annular wall 215 may be 80 degrees, 75 degrees, 70 degrees, and the like, so that the plastic part 220 is hard to fall off after being disposed in the plastic setting hole 212. Of course, the plastic setting hole 212 may have other shapes, such as a V-shaped, W-shaped, wave-shaped, and other non-optical inner wall as shown in fig. 5a to 5 c.
In addition, the outline of the plastic part 220 is usually slightly larger than the plastic setting hole 212, and the plastic part 220 and the metal body 210 can be firmly combined by being inserted into the plastic setting hole 212 through a forced extrusion method.
In this embodiment, the plastic part 220 is made of PEI (Polyetherimide), wherein the plastic part 220 is doped with glass fibers, the ratio of the glass fibers in the plastic part 220 is 5% to 10%, and the glass fibers can improve the mechanical strength of the plastic part 220 and the service life of the plastic part 220.
After the plastic part 220 with the tuning screw hole 222 is disposed on the metal body 210, and then the metal body 210 is silver-plated, the silver-plated layer will only adhere to the surface of the metal body 210, will not adhere to the plastic part 220, and will not adhere to the inner wall of the screw thread of the tuning screw hole 222, so that the debris problem described in the background art will not occur. It should be noted that there are many kinds of silver plating processes, the silver plating process adopted in this embodiment can only plate silver on a metal surface, but not on a plastic surface, and the silver plating process adopted in the first embodiment can plate silver on a plastic surface.
The invention also provides a cavity filter, which comprises a cavity and the cover plate 200, wherein the cover plate 200 covers the cavity in a welding mode or a screw fixing mode.
The invention also provides communication equipment, which comprises the cavity filter, wherein the communication equipment is at least one of a duplexer, a simplex, a splitter, a combiner or a tower amplifier.
In summary, it is easily understood by those skilled in the art that the cavity filter and the cover plate 100(200) thereof and the communication device including the cavity filter provided by the present invention can reduce the production cost and the product weight of the cover plate 100(200) without generating debris by designing the portion of the cover plate 100(200) that cooperates with the tuning screw 130(230) as a plastic material.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The cover plate of the cavity filter is characterized by comprising a plastic body and a conductive layer attached to the surface of the plastic body.
2. The cover sheet according to claim 1, wherein the conductive layer is a silver-plated layer and is attached to one surface of the plastic body.
3. The decking of claim 1, wherein the plastic body is formed by injection molding.
4. The cover plate according to claim 1, wherein the plastic body is provided with tuning screw holes penetrating through the plastic body in a thickness direction.
5. The cover plate as claimed in claim 1, wherein the plastic body has a plurality of fixing holes distributed thereon.
6. The cover sheet according to claim 1, wherein the plastic body is made of PEI.
7. The decking of claim 1, wherein the plastic body is doped with fiberglass.
8. The cover sheet according to claim 7, wherein the glass fiber is 5% to 10% of the plastic body.
9. A cavity filter, comprising:
a cavity;
the cover plate of any one of claims 1 to 8, which covers the cavity by welding or screw-fixing.
10. A communication device comprising the cavity filter of claim 9, the communication device being at least one of a duplexer, a simplex, a splitter, a combiner, or a tower top amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910980368.1A CN112670684A (en) | 2019-10-15 | 2019-10-15 | Cavity filter, cover plate thereof and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910980368.1A CN112670684A (en) | 2019-10-15 | 2019-10-15 | Cavity filter, cover plate thereof and communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112670684A true CN112670684A (en) | 2021-04-16 |
Family
ID=75400124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910980368.1A Pending CN112670684A (en) | 2019-10-15 | 2019-10-15 | Cavity filter, cover plate thereof and communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112670684A (en) |
-
2019
- 2019-10-15 CN CN201910980368.1A patent/CN112670684A/en active Pending
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