General shielding structure for radio frequency signal of passive device

Abstract

A universal shielding structure for radio frequency signals of a passive device comprises a metal box body and a metal cover plate, the passive device is arranged in an inner cavity formed by assembling the metal box body and the metal cover plate, the shielding structure further comprises at least one boss arranged between the metal box body and the metal cover plate, and the boss and the metal box body or the metal cover plate are integrally formed. The boss surrounds the outer side of the inner cavity and is connected end to end to form a closed signal shielding wall; a signal shielding film is arranged on the end face of the free end of the boss. The metal box body and the metal cover plate are fixedly connected through screws. According to the utility model, the boss and the signal shielding film are additionally arranged between the metal cover plate and the metal box body, and the metal cover plate and the metal box body are fixed by matching with the screws, so that a tight downward pressure is formed under the fixation of the screws at the periphery of the boss, the contact strength between the boss and the metal cover plate is improved, and the sealing effect is enhanced; therefore, better electric contact is provided, and leakage of electromagnetic signals is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to passive radio frequency device field, concretely relates to a passive device radio frequency signal general shielding structure. BACKGROUND

[0002] Radio frequency system will have integrated various passive radio frequency devices, the market common passive radio frequency device has Wilkinson power divider, coupler, cavity filter etc., various passive radio frequency devices generally mainly have metal box and metal cover plate, and the cover plate is fixed on the box, forms the inner cavity shielding, and S parameter is normal, and signal input and output are normal.

[0003] And no matter how high the smoothness of the metal cover plate processing is, there will be a gap between the contact fitting surface between the box, and this gap will have signal overflow more or less, especially in a communication system, multiple devices will have multiple external signal interference, thereby affecting the performance of the whole system.

[0004] In electromagnetic compatibility radiation emission test, the signal interference between various passive radio frequency devices often causes the test result to exceed the limit value requirement, at the same time, the interference signal applied in the radiation interference test can also affect it, so that the test result does not meet the relevant standard provisions. Some products will increase a shielding index during testing, which improves the shielding performance requirement of each internal radio frequency device.

[0005] Therefore, how to solve the above-mentioned problems existing in the prior art has become the research and solution of the utility model. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a passive device radio frequency signal general shielding structure capable of shielding internal and external radio frequency signals.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0008] A passive device radio frequency signal general shielding structure, including metal box and metal cover plate, the passive device is arranged in the inner cavity formed by the assembly of the metal box and the metal cover plate, and the shielding structure further includes at least one boss arranged between the metal box and the metal cover plate, and the boss is integrally formed with the metal box or the metal cover plate;

[0009] The boss surrounds the outer side of the inner cavity, and its head and tail are connected to form a closed signal shielding wall;

[0010] The free end face of the boss is provided with a signal shielding film, and the signal shielding film is in surface contact with the metal box or the metal cover plate;

[0011] The metal box body and the metal cover plate are fixedly connected by screws.

[0012] Preferably, the signal shielding film is a copper foil, a silver foil or a gold foil.

[0013] Preferably, when the plurality of protrusions are provided, the protrusions are uniformly distributed from the inside to the outside.

[0014] Preferably, the protrusion is protrudingly arranged on the upper surface of the metal box body, and the signal shielding film at the top free end of the protrusion is in contact with the lower surface of the metal cover plate.

[0015] Preferably, the protrusion is protrudingly arranged on the lower surface of the metal cover plate, and the signal shielding film at the bottom free end of the protrusion is in contact with the upper surface of the metal box body.

[0016] Preferably, a plurality of through holes are uniformly and vertically arranged on the edge of the metal box body, a plurality of screw grooves are arranged on the metal cover plate corresponding to the through holes, and the screws are threadedly matched with the screw grooves through the through holes.

[0017] Preferably, a groove corresponding to the protrusion is arranged on the metal box body or the metal cover plate, the height of the groove is lower than the height of the protrusion, and the free end of the protrusion is clamped and matched with the groove.

[0018] The working principle and advantages of the utility model are as follows:

[0019] The utility model discloses a protrusion and a signal shielding film are additionally arranged between the metal cover plate and the metal box body, and the metal cover plate and the metal box body are fixed by cooperating with screws, so that a fastening pressing force is formed under the fixation of the screws around the protrusion, the contact strength between the protrusion and the metal cover plate is improved, the sealing effect is enhanced, better electrical contact is provided, and the leakage of electromagnetic signals is reduced.

[0020] The protrusion of the utility model can also increase the energy attenuation of electromagnetic signals, and change the propagation path of electromagnetic signals as a physical barrier, so that the electromagnetic signals are difficult to pass through the gap, thereby reducing the leakage of electromagnetic signals and improving the shielding performance.

[0021] The utility model utilizes the signal shielding film to fill the contact surface between the cavity of the box body and the cover plate, which can assist in increasing the contact tightness and stability of the protrusion and the box body or the cover plate on the one hand, and reflect the leaked electromagnetic signals across the protrusion structure on the other hand, thereby further improving the shielding performance.

[0022] The utility model integrates the protrusion with the metal cover plate or the metal box body, and then pastes a copper foil or other signal shielding film on the free end of the protrusion, so that the whole shielding structure is simple in structure, the material cost and the processing cost are reduced, and stronger shielding effect is achieved on the basis of simple structure. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application. Figure 1 Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application.

[0024] Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application. Figure 2 Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application.

[0025] Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application. Figure 3 Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application.

[0026] Figure 4 Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application.

[0027] Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application. Figure 5 Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application.

[0028] Figure 6 Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application.

[0029] Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application. Figure 7 Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application.

[0030] Figure 1 is an assembled sectional view of a shielding structure according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] The present application will be further described by the following embodiments and drawings:

[0032] The present application will be further described by the following embodiments and drawings:

[0033] The terms used herein are only for describing specific embodiments, and are not intended to limit the present application. The singular forms, such as "a", "this", "this", "this", and "the", as used herein, also include the plural forms.

[0034] The terms "first", "second", etc. used herein do not mean to indicate the order or sequence, nor to limit the present application, but only to distinguish the components or operations described by the same technical terms.

[0035] As used herein, "connected" or "positioned" can mean that two or more components or devices are in direct physical contact, or are indirectly in physical contact through other components or devices, or can mean that two or more components or devices operate or act together.

[0036] ​​As used herein, the terms "comprise", "comprising", "include", "including", "have" and "having" or the like are open-ended, that is, meaning "including but not limited to".

[0037] As used herein, the terms "comprise", "comprising", "include", "including", "have" and "having" or the like are open-ended, that is, meaning "including but not limited to".

[0038] As used herein, the terms "comprise", "comprising", "include", "including", "have" and "having" or the like are open-ended, that is, meaning "including but not limited to".

[0039] Embodiment 1, see attached Figures 1-2 As shown in the figure, a general shielding structure for radio frequency signals of a passive device includes a metal box body 1 and a metal cover plate 2, and the passive device is arranged in an inner cavity formed by assembling the metal box body 1 and the metal cover plate 2. The shielding structure further includes a boss 3 arranged between the metal box body 1 and the metal cover plate 2.

[0040] In this embodiment, as shown in the figure, the boss 3 is integrally formed with the metal box body 1, the boss 3 is arranged protruding on the upper surface of the metal box body 1, the boss 3 surrounds the outside of the inner cavity, and the head and tail of the boss 3 are connected to form a closed signal shielding wall. The top end of the boss 3 is a free end, and a signal shielding film 4 is arranged on the end face of the free end, and the signal shielding film 4 is in surface contact with the lower surface of the metal cover plate 2. Figure 3 In other embodiments, the boss 3 is provided as more than one, and each boss 3 is uniformly distributed from the inside to the outside, and the height of the boss 3 can be 0.2mm, as shown in the figure.

[0041] Figure 4

[0042] In this embodiment, the signal shielding film 4 is a copper foil. In other embodiments, it can be a silver foil or a gold foil as needed. The signal shielding film 4 can assist in increasing the contact tightness and stability of the metal cover plate 2 and the boss 3 on the one hand, and can reflect the leaked electromagnetic signals beyond the boss 3, thereby further improving the shielding performance.

[0043] In this embodiment, the metal box body 1 and the metal cover plate 2 are fixedly connected by screws 6. Specifically, a plurality of through holes 11 are vertically and uniformly provided on the edges of the metal box body 1, a plurality of screw grooves 21 are provided on the metal cover plate 2 corresponding to the through holes 11, and the screws 6 are threadedly matched with the through holes 11 and the screw grooves 21.

[0044] ​​The embodiment changes the full contact between the metal box 1 and the metal cover plate 2 in the prior art, uses the boss 3 to pull apart the metal box 1 and the metal cover plate 2 to form a gap, so that the contact surface between the metal box 1 and the metal cover plate 2 is only the free end surface of the boss 3, and under the fixation of the screw 6 around the boss 3, a tight pressing force is formed to improve the contact strength between the boss 3 and the metal cover plate 2 and enhance the sealing effect, so as to provide better electrical contact and reduce the leakage of electromagnetic signals. In addition, the boss 3 can also increase the energy attenuation of the electromagnetic signals and change the propagation path of the electromagnetic signals as a physical barrier, so that it is difficult to pass through the gap, thereby reducing the leakage of the electromagnetic signals and improving the shielding performance.

[0045] Through the network analyzer test, the shielding performance of a single device in a conventional device is-80dB-110dB, and it is a bit difficult to reach-120dB. By using the above shielding structure of the embodiment, the shielding performance can reach-140dB-150dB, so as to reduce the interference between devices in the radio frequency system unit. Similarly, passive devices such as microstrip power dividers, couplers, cavity filters and the like can also use this structure to increase the shielding performance of the devices themselves.

[0046] In order to further improve the sealing and the contact strength, as shown in Figures 5-6 , a groove 5 corresponding to the boss 3 is formed on the metal cover plate 2, the height of the groove 5 is lower than the height of the boss 3, and the free end of the boss 3 is clamped and matched with the groove 5. The concave-convex matching surface formed by the groove 5 can further realize sealing and change the propagation path of the electromagnetic signals, so that it is more difficult for the electromagnetic signals to pass through the gap, thereby further reducing the leakage of the electromagnetic signals and improving the shielding performance.

[0047] Embodiment 2, as shown in the accompanying Figure 7 , the embodiment is basically the same as embodiment 1, the difference is that the boss 3 is integrally formed with the metal cover plate 2, the boss 3 is protrudingly arranged on the lower surface of the metal cover plate 2, and the signal shielding film 4 at the free end of the bottom of the boss 3 is in contact with the upper surface of the metal box 1.

[0048] In order to further improve the sealing and the contact strength, a groove 5 corresponding to the boss 3 is formed on the metal box 1, the height of the groove 5 is lower than the height of the boss 3, and the free end of the boss 3 is clamped and matched with the groove 5 (not shown in the figure).

[0049] The effect of the embodiment is basically the same as that of embodiment 1.

[0050] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A general shielding structure for radio frequency signals of a passive device, comprising a metal box body and a metal cover plate, the passive device being arranged in an inner cavity formed by assembling the metal box body and the metal cover plate, characterized in that: At least one convex block is arranged between the metal box body and the metal cover plate, and the convex block is integrally formed with the metal box body or the metal cover plate; The convex blocks are arranged around the inner cavity, and the first and last convex blocks are connected to form a closed signal shielding wall; A signal shielding film is arranged on the free end surface of the convex block, and the signal shielding film is in surface contact with the metal box body or the metal cover plate; The metal box body and the metal cover plate are fixedly connected by screws.

2. The general shielding structure for radio frequency signals of a passive device according to claim 1, characterized in that: The signal shielding film is a copper foil, a silver foil or a gold foil.

3. The universal shielding structure for radio frequency signals of a passive device according to claim 1, wherein: When there are more than one convex block, the convex blocks are uniformly distributed from the inside to the outside.

4. The universal shielding structure for radio frequency signals of a passive device according to claim 1, wherein: The convex block is protrusively arranged on the upper surface of the metal box body, and the signal shielding film at the top free end of the convex block is in contact with the lower surface of the metal cover plate.

5. The universal shielding structure for radio frequency signals of a passive device according to claim 1, wherein: The convex block is protrusively arranged on the lower surface of the metal cover plate, and the signal shielding film at the bottom free end of the convex block is in contact with the upper surface of the metal box body.

6. The universal shielding structure for radio frequency signals of a passive device according to claim 1, wherein: A plurality of through holes are uniformly and vertically arranged on the edges of the metal box body, a plurality of screw grooves are arranged on the metal cover plate corresponding to the through holes, and the screws are threadedly matched with the through holes and the screw grooves.

7. The universal shielding structure for radio frequency signals of a passive device according to claim 1, wherein: A groove corresponding to the convex block is arranged on the metal box body or the metal cover plate, the height of the groove is lower than the height of the convex block, and the free end of the convex block is in clamping cooperation with the groove.

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