CN215451771U - Electromagnetic shield and active antenna unit - Google Patents
Electromagnetic shield and active antenna unit Download PDFInfo
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- CN215451771U CN215451771U CN202121200378.8U CN202121200378U CN215451771U CN 215451771 U CN215451771 U CN 215451771U CN 202121200378 U CN202121200378 U CN 202121200378U CN 215451771 U CN215451771 U CN 215451771U
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Abstract
The utility model discloses an electromagnetic shielding cover and an active antenna unit, wherein the active antenna unit comprises the electromagnetic shielding cover, the electromagnetic shielding cover comprises a metal frame and a wave-absorbing module, the metal frame is used for being sleeved on a circuit board, and the surface of the metal frame is provided with an opening part; the wave absorbing module is arranged at the opening part; the opening has been seted up on metal frame's surface, and place at the opening and inhale the ripples module, this electromagnetic shield cover compares with current metal shield cover, the surface cover body with current metal shield cover replaces with inhaling the ripples module, because it has fine absorption or weakens the function by a wide margin to electromagnetic wave energy to inhale the ripples module, when being applied to radio frequency circuit under the prerequisite that does not change current circuit size, electromagnetic interference and stability problem in can effectual solution power amplifier circuit design, and further miniaturization provides the guarantee to subsequent equipment design.
Description
Technical Field
The utility model relates to the field of electromagnetic wave shielding, in particular to an electromagnetic shielding case and an active antenna unit.
Background
5G Active Antenna Unit (AAU) adopts large-scale Multiple-Input Multiple-Output (Massive MIMO) technique, and the design of AAU equipment tends to miniaturize, causes the power amplifier link complicated, and the device integrated level is high to aggravate the electromagnetic interference and the stability problem of power amplifier link, traditional simple metallic shield cover can't compromise and solve electromagnetic interference problem and stability problem.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to at least one of the problems of the prior art, and provides an electromagnetic shielding case and an active antenna unit, which can solve the problem of electromagnetic interference and have good stability.
In a first aspect, an embodiment of the present invention provides an electromagnetic shielding cover, including a metal frame and a wave-absorbing module, where:
the metal frame is used for being sleeved on the circuit board, and an opening part is formed in the surface of the metal frame;
the wave absorbing module is arranged at the opening part.
In a second aspect, embodiments of the present invention provide an active antenna element comprising an electromagnetic shield as described in embodiments of the first aspect of the present invention.
The embodiment of the utility model comprises the following steps: an electromagnetic shield and an active antenna element. According to the scheme provided by the embodiment of the utility model, the opening part is formed on the surface of the metal frame, the wave-absorbing module is arranged at the opening part, compared with the existing metal shielding cover, the electromagnetic shielding cover replaces the surface cover body of the existing metal shielding cover with the wave-absorbing module, and the wave-absorbing module has good absorption or greatly weakening function on electromagnetic wave energy, so that the electromagnetic interference and stability problems in the design of a power amplifier circuit can be effectively solved on the premise of not changing the current circuit size when the electromagnetic shielding cover is applied to a radio frequency circuit, and the further miniaturization of the subsequent equipment design is ensured.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the example serve to explain the principles of the utility model and not to limit the utility model.
The utility model is further described below with reference to the accompanying drawings and examples;
fig. 1 is a schematic structural diagram of an electromagnetic shielding case according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electromagnetic shielding case according to a second embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The embodiment of the utility model provides an electromagnetic shielding case and an active antenna unit, which can solve the problem of electromagnetic interference and have better stability.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, a first embodiment of the present invention provides an electromagnetic shielding enclosure, including a metal frame 100 and a wave-absorbing module 200, where:
the metal frame 100 is used for being sleeved on the circuit board, and an opening 110 is formed in the surface of the metal frame 100;
the wave absorbing module 200 is disposed at the opening 110.
In the electromagnetic shield that this embodiment provided, opening 110 has been seted up on metal frame 100's surface, and place at opening 110 and inhale ripples module 200, this electromagnetic shield compares with current metal shield, the surface cover body with current metal shield replaces the ripples module, because inhale ripples module 200 has fine absorption or weakens the function by a wide margin to electromagnetic wave energy, when being applied to radio frequency circuit under the prerequisite that does not change current circuit size, electromagnetic interference and stability problem in can effectual solution power amplifier circuit design, and further miniaturization to subsequent equipment design provides the guarantee.
In addition, in an embodiment, the opening portion 110 includes a plurality of caulking grooves 111 disposed on the surface of the metal frame 100, and each caulking groove 111 is provided with the wave absorbing module 200.
The wave-absorbing module 200 is installed by arranging the caulking groove 111 on the surface of the metal frame 100, so that the wave-absorbing module 200 and the metal frame 100 can be combined conveniently, and a closed and complete wave-absorbing shielding cover is formed. As shown in fig. 2, four caulking grooves 111 are formed in the upper surface of the metal frame 100, and the wave absorbing modules 200 are disposed in all of the four caulking grooves 111. It is understood that the number of the caulking grooves 111 may be one, two, three, or five or more. In addition, the caulking groove 111 may be formed on the upper surface of the metal frame 100 as shown in fig. 2, or may be formed on another surface of the metal frame, for example, on a side surface of the metal frame 100, or the caulking groove 111 may be formed on both the upper surface and the side surface of the metal frame 100, and the number of the caulking grooves 111 formed on each surface may be one or more.
The shape and size of the wave-absorbing module 200 can be flexibly changed according to factors such as circuit architecture, resonant frequency of a cavity of the electromagnetic shielding cover, electromagnetic field distribution of the cavity of the electromagnetic shielding cover, cost and the like; the position of the caulking groove 111 can be the position with the strongest field electromagnetic field and the position above the sensitive active device according to the electromagnetic simulation of the cavity of the electromagnetic shielding cover, and the size of the caulking groove 111 can be correspondingly designed according to the circuit board. It can be understood that after the shape and the size of the caulking groove 111 are determined, the shape and the size of the wave-absorbing module 200 are generally determined, because the shape of the wave-absorbing module 200 is consistent with the shape of the caulking groove 111, so as to ensure that the wave-absorbing module 200 can be just covered on the caulking groove 111, and the wave-absorbing module 200 and the metal frame 100 form a complete closed wave-absorbing shielding cover body; the thickness of the wave-absorbing module 200 is generally set to be slightly greater than the depth of the caulking groove 111.
As shown in fig. 1, the opening 110 may occupy the entire upper surface or the entire side surface of the metal frame 100, and accordingly, the wave-absorbing module 200 may cover the entire opening 110, that is, the entire upper surface or the entire side surface of the opening 110, unlike the form of the caulking groove 111 shown in fig. 2.
In one embodiment, the wave-absorbing module 200 is adhered to the metal frame 100 or fixed to the metal frame 100 by screws.
It can be understood that the wave-absorbing module 200 can be fixed on the metal frame 100 in various ways, as shown in fig. 1, corresponding mounting portions can be respectively arranged on the wave-absorbing module 200 and the metal frame 100, and then the wave-absorbing module 200 and the metal frame 100 are fixedly connected by screws; alternatively, as shown in fig. 2, the wave-absorbing module 200 can be directly adhered to the caulking groove 111 of the metal frame 100.
In one embodiment, the wave-absorbing module 200 is one of the following:
preparing a wave-absorbing material;
ceramic with wave-absorbing coating on the surface;
the surface is attached with metal of a wave-absorbing coating.
The wave-absorbing module 200 can be made of wave-absorbing material, which can absorb or greatly reduce the electromagnetic wave energy received by its surface, so as to reduce the interference of electromagnetic wave. The wave-absorbing module 200 can further use a wave-absorbing film which has high heat conduction efficiency, so that the wave-absorbing film can be used for electromagnetic shielding and is beneficial to heat dissipation of devices in the cavity; in addition, other materials with both shielding and wave absorbing functions can be adopted, such as an electromagnetic wave absorber; or a ceramic or metal structure with a wave-absorbing coating attached to the surface.
In addition, in one embodiment, the inner wall of the metal frame 100 is sprayed with a wave-absorbing coating.
The electromagnetic wave absorption effect of the electromagnetic shielding cover can be improved by spraying the wave absorption coating on the inner wall of the metal frame 100.
Referring to fig. 2, in an embodiment, the microwave absorbing module further includes a filter 300 fixed on the metal frame 100, and the filter 300 is matched with the metal frame 100 to clamp and fix the microwave absorbing module 200.
When the filter 300 is needed to be used in the radio frequency circuit using the electromagnetic shielding case of this embodiment, the filter 300 may be fixed on the metal frame 100, and the filter 300 is matched with the metal frame 100 to clamp and fix the wave-absorbing module 200, so that the wave-absorbing module 200 may be further fixed, and the wave-absorbing module 200 is prevented from loosening and the wave-absorbing module 200 is not easy to fall off. During installation, the metal frame 100 can be fixed on the circuit board through screws, the wave absorbing module 200 is adhered to the embedded groove 111 of the metal frame 100, the filter 300 is fixed on the metal frame 100 through screws, and the wave absorbing module 200 is pressed tightly in the embedded groove 111 by the filter 300, so that a complete and closed wave absorbing shielding cover is formed, and the problems of electromagnetic interference and stability of a circuit can be well solved by the shielding cover.
The filter 300 may be a metal filter or a dielectric filter, or an antenna tooling plate including a dielectric filter may be used instead.
In addition, in an embodiment, when the rf circuit using the electromagnetic shielding case of the present embodiment does not need to use the filter 300, the electromagnetic shielding case of the present embodiment may include a metal plate fixed on the metal frame 100, and the metal plate cooperates with the metal frame 100 to clamp and fix the wave absorbing module 200.
Referring to fig. 1 or 2, in an embodiment, the metal frame 100 is provided with a mounting portion 120 for fixing on a circuit board, and the mounting portion 120 is provided with a mounting hole 121.
The metal frame 100 may be screwed through the mounting holes 121 of the mounting part 120 to fix the metal frame 100 to the circuit board.
As shown in fig. 1, when the wave-absorbing module 200 is also fixed to the metal frame 100 by screws, the wave-absorbing module can share the mounting portion 120 of the metal frame 100, that is, the screws penetrate through the wave-absorbing module 200, the metal frame 100 and the circuit board at the same time, so as to fix the three components together; similarly, as shown in fig. 2, when the filter 300 is fixed to the metal frame 100 by screws, the mounting portion 120 of the metal frame 100 can be shared, that is, the screws penetrate through the filter 300, the metal frame 100 and the circuit board at the same time, so as to fix the three components together.
In addition, the bottom of the metal frame 100 is provided with conductive adhesive, and the partition wall of the circuit board is made of bright copper, so as to ensure sufficient grounding between the metal frame 100 and the circuit board.
In a second aspect, embodiments of the present invention also provide an active antenna element comprising an electromagnetic shield as in the first aspect of the present invention.
In the active antenna unit that this embodiment provided, opening 110 has been seted up on metal frame 100's surface, and place at opening 110 and inhale ripples module 200, this electromagnetic shield cover compares with current metal shielding cover, the surface cover body with current metal shielding cover replaces with inhaling the ripples module, because it has fine absorption or weakens the function by a wide margin to inhale ripples module 200 to electromagnetic wave energy, under the prerequisite that does not change active antenna unit size, electromagnetic interference and stability problem in can effectual solution active antenna unit power amplifier circuit design, and further miniaturization provides the guarantee to subsequent active antenna unit design.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. An electromagnetic shield, comprising:
the metal frame is used for being sleeved on the circuit board, and an opening part is formed in the surface of the metal frame;
the wave absorbing module is arranged at the opening part.
2. The electromagnetic shielding case according to claim 1, wherein the opening portion comprises a plurality of caulking grooves disposed on the surface of the metal frame, and each caulking groove is provided with the wave absorbing module.
3. The electromagnetic shield according to claim 1, wherein the wave-absorbing module is adhered to the metal frame or fixed to the metal frame by screws.
4. The electromagnetic shield of claim 1, wherein the wave-absorbing module is one of:
preparing a wave-absorbing material;
ceramic with wave-absorbing coating on the surface;
the surface is attached with metal of a wave-absorbing coating.
5. The electromagnetic shield according to claim 1, wherein the inner wall of the metal frame is coated with a wave-absorbing coating.
6. The electromagnetic shield according to claim 1, further comprising a filter fixed to the metal frame, the filter engaging the metal frame to hold the wave-absorbing module.
7. The electromagnetic shield according to claim 1, further comprising a metal plate fixed to the metal frame, wherein the metal plate is engaged with the metal frame to clamp and fix the wave-absorbing module.
8. The electromagnetic shield according to claim 1, wherein the metal frame is provided with a mounting portion for fixing to the circuit board, the mounting portion being provided with a mounting hole.
9. Electromagnetic shield according to claim 1, characterized in that the bottom of the metal frame is provided with a conductive glue.
10. An active antenna element comprising an electromagnetic shield as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121200378.8U CN215451771U (en) | 2021-05-31 | 2021-05-31 | Electromagnetic shield and active antenna unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121200378.8U CN215451771U (en) | 2021-05-31 | 2021-05-31 | Electromagnetic shield and active antenna unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215451771U true CN215451771U (en) | 2022-01-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121200378.8U Active CN215451771U (en) | 2021-05-31 | 2021-05-31 | Electromagnetic shield and active antenna unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215451771U (en) |
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2021
- 2021-05-31 CN CN202121200378.8U patent/CN215451771U/en active Active
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