Electromagnetic shielding structure and RF products used in C-band multi-link RF boards

Abstract

The present invention discloses an electromagnetic shielding structure and radio frequency product applied to a C-band multi-link radio frequency board, and relates to the field of integrated circuits. The electromagnetic shielding structure includes a radio frequency cover plate, an upper cover plate, a first electromagnetic shielding sealing strip, a second electromagnetic shielding sealing strip, and a third electromagnetic shielding sealing strip; the radio frequency cover plate is arranged on the concave cavity of the radio frequency cavity and includes a substrate and a plurality of isolation ribs arranged on the substrate, the isolation ribs correspond to the exposed copper areas one by one, and a sealing groove is provided on each isolation rib, and a first electromagnetic shielding sealing strip is provided in the sealing groove; a second electromagnetic shielding sealing strip is provided between the radio frequency cover plate and the radio frequency cavity; the upper cover plate is arranged on the radio frequency cover plate, and a third electromagnetic shielding sealing strip is provided between the upper cover plate and the radio frequency cavity. The present invention improves the electromagnetic shielding effect between the links of the C-band multi-link radio frequency board.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated circuits, and in particular relates to an electromagnetic shielding structure and a radio frequency product applied to a C-band multi-link radio frequency board. Background Art

[0002] As RF products contain more and more sensitive electronic components, equipment failures caused by electromagnetic energy interference or "noise" are increasing. At the same time, as RF products become smaller and faster, the challenges of managing electromagnetic pollution are increasing.

[0003] Conventional RF products require an isolation cavity between multiple links (a link refers to a communication path used to transmit RF signals). The isolation cavity isolates two adjacent links. The isolation cavity has two main functions: first, to isolate very sensitive or easily interfered circuits; second, to prevent the cavity from being too large and the gain from being too large, which may cause self-excitation. The isolation cavity has a significant shielding effect on high-frequency electromagnetic wave interference, but a relatively weak shielding effect on low-frequency electromagnetic waves.

[0004] The electromagnetic shielding effect is also related to the penetration of electromagnetic waves. Compared with the X-band, the C-band has a lower frequency and stronger electromagnetic wave penetration, which means that C-band electromagnetic waves can more easily penetrate objects and gaps, making C-band electromagnetic waves more difficult to shield. Therefore, even with conventional shielding methods, the links of the C-band multi-link radio board are susceptible to interference. Summary of the invention

[0005] The purpose of the present invention is to provide an electromagnetic shielding structure and a radio frequency product applied to a C-band multi-link radio frequency board, so as to solve the problem that the conventional shielding means have poor shielding effect on the C-band multi-link radio frequency board, which in turn causes the links to be susceptible to interference, because the C-band electromagnetic waves can more easily penetrate objects and gaps.

[0006] The present invention solves the above technical problems through the following technical solutions: an electromagnetic shielding structure applied to a C-band multi-link radio frequency board, wherein the C-band multi-link radio frequency board is arranged in a concave cavity of a radio frequency cavity, and different links on the C-band multi-link radio frequency board are isolated by an isolation structure, and the electromagnetic shielding structure comprises:

[0007] A radio frequency cover plate provided on the concave cavity of the radio frequency cavity, the radio frequency cover plate comprising a substrate and isolation ribs provided on the substrate, the isolation ribs corresponding to the isolation structures one by one, and a sealing groove is provided on each of the isolation ribs, and a first electromagnetic shielding sealing strip for sealing a gap between the isolation ribs and the corresponding isolation structure is provided in the sealing groove;

[0008] A second electromagnetic shielding sealing strip is provided along the periphery of the RF cover plate and between the RF cover plate and the RF cavity;

[0009] An upper cover plate disposed on the radio frequency cover plate;

[0010] And a third electromagnetic shielding sealing strip is arranged along the periphery of the upper cover plate and between the upper cover plate and the radio frequency cavity.

[0011] The electromagnetic shielding structure of the present invention adds isolation ribs and a first electromagnetic shielding sealing strip between the isolation ribs and the isolation structure on the basis of the isolation structure. The isolation structure, the isolation ribs and the first electromagnetic shielding sealing strip between the isolation structure and the isolation ribs realize isolation between each link, improves the electromagnetic shielding effect between adjacent links, and improves the problem that each link of the C-band multi-link radio frequency board is susceptible to interference. The present invention adopts a double cover plate + double electromagnetic shielding sealing strip structure to further improve the electromagnetic shielding effect.

[0012] Furthermore, the fixing holes on the isolation ribs are located on one or both sides of the sealing groove, and the sealing groove on the isolation ribs is a continuous groove. The continuous and non-interrupted sealing groove ensures the integrity of the first electromagnetic shielding sealing strip, thereby improving the electromagnetic shielding effect between links.

[0013] Furthermore, the isolation structure is a copper exposed area.

[0014] Furthermore, the electromagnetic shielding structure also includes a lower cover plate arranged at the bottom of the radio frequency cavity.

[0015] Furthermore, notches are provided on both sides of the normally-on RF connection point of the C-band multi-link RF board, and the intermittent RF connection points of the C-band multi-link RF board are arranged on both sides of the notch of the normally-on RF connection point, and two intermittent RF connection points that do not work at the same time are arranged adjacent to each other;

[0016] Among them, the normally-on RF connection point refers to a RF connection point when it is working, that is, a signal passes through it; the intermittent RF connection point refers to a RF connection point that is turned on and off according to working needs.

[0017] Furthermore, a separation wall is provided around the gap.

[0018] Furthermore, a U-shaped groove is provided at the isolation wall or the radio frequency cavity in contact with the isolation rib, and the isolation rib is embedded in the U-shaped groove, thereby further improving the electromagnetic shielding effect.

[0019] Furthermore, a connector connected to the normally on RF connection point and the intermittent RF connection point is provided on the side of the RF cavity, and the connector includes a power connector, a communication connector, an SMA connector and a coupling connector.

[0020] Based on the same concept, the present invention also provides a radio frequency product, which includes the electromagnetic shielding structure as described above.

[0021] Beneficial Effects

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] The electromagnetic shielding structure of the present invention adds isolation ribs and a first electromagnetic shielding sealing strip between the isolation ribs and the isolation structure on the basis of the isolation structure. The isolation structure, the isolation ribs and the first electromagnetic shielding sealing strip between the isolation structure and the isolation ribs realize isolation between each link, improves the electromagnetic shielding effect between adjacent links, and improves the problem that each link of the C-band multi-link radio frequency board is susceptible to interference. The present invention adopts a double cover plate + double electromagnetic shielding sealing strip structure to further improve the electromagnetic shielding effect.

[0024] The present invention overcomes the problems of great difficulty in electromagnetic shielding of C-band multi-link radio frequency boards and many equipment failures caused by "noise"; by adjusting the PCB layout of the C-band multi-link radio frequency board and optimizing the structural design, the electromagnetic shielding requirements of C-band and even S-band radio frequency products can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a front view of the electromagnetic shielding structure in an embodiment of the present invention;

[0027] Figure 2 In the embodiment of the present invention Figure 1 AA section view;

[0028] Figure 3 is a side view of the electromagnetic shielding structure in an embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of the positions of various electromagnetic shielding sealing strips in an embodiment of the present invention;

[0030] Figure 5 is an exploded view of the electromagnetic shielding structure in an embodiment of the present invention;

[0031] Figure 6 is a structural schematic diagram of a radio frequency cover plate in an embodiment of the present invention;

[0032] Figure 7is a schematic diagram of a C-band multi-link radio frequency board in an embodiment of the present invention;

[0033] Figure 8 Schematic diagram of a U-shaped groove of a radio frequency cavity and a separation wall in an embodiment of the present invention;

[0034] Fig. 9 is a schematic diagram of the connection between the isolation rib and the radio frequency cavity in a conventional design in an embodiment of the present invention;

[0035] Fig.10 is an overall schematic diagram of the positional relationship between the isolation ribs and the radio frequency cavity or isolation wall in an embodiment of the present invention;

[0036] Fig.11 In the embodiment of the present invention Fig.10 A partial enlarged schematic diagram of area B;

[0037] Fig.12 Schematic diagram of the U-shaped groove between the isolation rib and the radio frequency cavity in an embodiment of the present invention.

[0038] Explanation of the accompanying drawings: 1-C-band multi-link RF board, 101-exposed copper area, 102-first RF connection point, 103-second RF connection point, 104-third RF connection point, 105-fourth RF connection point, 106-fifth RF connection point, 107-sixth RF connection point, 108-gap, 109-isolation wall, 2-RF cavity, 201-concave cavity, 202-second electromagnetic shielding sealing strip, 203-third electromagnetic shielding sealing strip, 204-power connector, 205-Ethernet connector, 206-SMA connector, 207-coupling connector, 208-U-shaped groove, 3-RF cover plate, 301-substrate, 302-isolation ribs, 303-first electromagnetic shielding sealing strip, 304-sealing groove, 305-fixing hole, 4-upper cover plate, 5-lower cover plate. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solutions in the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0041] Compared with the X-band, the C-band electromagnetic waves have a lower frequency and stronger penetration, which makes the C-band electromagnetic waves more difficult to shield. Therefore, even if conventional shielding methods are used, the links of the C-band multi-link radio frequency board are still susceptible to interference.

[0042] Based on the above technical problems, the present invention provides an electromagnetic shielding structure applied to a C-band multi-link radio frequency board 1. The C-band multi-link radio frequency board 1 is arranged in a concave cavity 201 of a radio frequency cavity 2, and different links on the C-band multi-link radio frequency board 1 are isolated by an isolation structure. In this embodiment, the isolation structure is a copper exposed area 101, that is, the copper exposed area 101 is used to isolate the links on the C-band multi-link radio frequency board 1. Figure 7 shown.

[0043] like Figures 1 to 6 As shown, an electromagnetic shielding structure applied to a C-band multi-link radio frequency board 1 provided in an embodiment of the present invention includes a radio frequency cover plate 3, an upper cover plate 4, a first electromagnetic shielding sealing strip 303, a second electromagnetic shielding sealing strip 202 and a third electromagnetic shielding sealing strip 203; the radio frequency cover plate 3 is arranged on a concave cavity 201 of a radio frequency cavity 2, and the C-band multi-link radio frequency board 1 is enclosed in the concave cavity 201 by the radio frequency cover plate 3 and the side wall of the radio frequency cavity 2; the radio frequency cover plate 3 includes a substrate 301 and a plurality of isolation ribs 302 arranged on the substrate 301, and the isolation ribs 302 are aligned with the exposed copper area 101. One corresponds to another, and a sealing groove 304 is opened on each isolation rib 302, and a first electromagnetic shielding sealing strip 303 is arranged in the sealing groove 304 for sealing the gap between the isolation rib 302 and the corresponding copper exposed area 101; a second electromagnetic shielding sealing strip 202 is arranged between the RF cover plate 3 and the RF cavity 2, and the second electromagnetic shielding sealing strip 202 is arranged along the periphery of the RF cover plate 3; the upper cover plate 4 is arranged on the RF cover plate 3, and a third electromagnetic shielding sealing strip 203 is arranged between the upper cover plate 4 and the RF cavity 2, and the third electromagnetic shielding sealing strip 203 is arranged along the periphery of the upper cover plate 4.

[0044] The present invention adds isolation ribs 302 and a first electromagnetic shielding sealing strip 303 between the isolation ribs 302 and the isolation structure on the basis of the isolation of the copper exposed area 101. The isolation between the links is achieved through the copper exposed area 101, the isolation ribs 302 and the first electromagnetic shielding sealing strip 303 between the copper exposed area 101 and the isolation ribs 302, thereby improving the electromagnetic shielding effect between adjacent links and improving the problem that the links of the C-band multi-link radio frequency board 1 are susceptible to interference. The present invention adopts a double cover plate + double electromagnetic shielding sealing strip structure to further improve the electromagnetic shielding effect of the isolation cavity (each link corresponds to an isolation cavity), thereby improving the electromagnetic shielding effect between the links.

[0045] In a specific embodiment of the present invention, Figure 6As shown, the fixing hole 305 on each isolation rib 302 is located on one side or both sides of the sealing groove 304, so that the sealing groove 304 on the isolation rib 302 is a continuous and uninterrupted groove, ensuring the integrity of the first electromagnetic shielding sealing strip 303, thereby improving the electromagnetic shielding effect between links.

[0046] In a specific embodiment of the present invention, Figure 2 As shown, the electromagnetic shielding structure also includes a lower cover plate 5 arranged at the bottom of the radio frequency cavity 2.

[0047] When laying out the C-band multi-link radio frequency board 1, the radio frequency connection points are divided into two categories according to their working principles: always-on radio frequency connection points and intermittent radio frequency connection points. Always-on radio frequency connection points refer to radio frequency connection points through which signals pass when the radio frequency product is working; intermittent radio frequency connection points refer to radio frequency connection points that are sometimes on and sometimes off according to working needs.

[0048] The often-connected connection points work for a long time and are easily interfered by the surrounding electromagnetic signals. Therefore, two gaps are dug on both sides of the RF board during layout to achieve physical isolation through distance.

[0049] In order to further improve the shielding effect, gaps 108 are opened on both sides of the normally open RF connection point, and intermittent RF connection points are arranged on both sides of the gaps 108 of the normally open RF connection point, and two intermittent RF connection points that do not work at the same time are arranged adjacent to each other.

[0050] Since the intermittent RF connection points work intermittently, the intermittent RF connection points are arranged on both sides of the gap of the normally open RF connection points, and two intermittent RF connection points that do not work at the same time are arranged adjacent to each other, thereby reducing mutual interference of signals.

[0051] For example, Figure 7As shown, the first RF connection point 102 , the second RF connection point 103 , the fourth RF connection point 105 , the fifth RF connection point 106 and the sixth RF connection point 107 are all intermittent RF connection points, and the third RF connection point 104 is a normally on RF connection point. Gaps 108 are provided on both sides of the third RF connection point 104, the first RF connection point 102 and the second RF connection point 103 are located on the upper side of the gap of the third RF connection point 104, the fourth RF connection point 105, the fifth RF connection point 106 and the sixth RF connection point 107 are located on the lower side of the gap of the third RF connection point 104, the first RF connection point 102 and the second RF connection point 103 do not work at the same time (that is, when a signal passes through the first RF connection point 102, no signal passes through the second RF connection point 103, or when a signal passes through the second RF connection point 103, no signal passes through the first RF connection point 102), and the fifth RF connection point 106 does not work at the same time as the fourth RF connection point 105 and the sixth RF connection point 107, that is, when a signal passes through the fifth RF connection point 106, no signal passes through the fourth RF connection point 105 and the sixth RF connection point 107, or, when no signal passes through the fifth RF connection point 106, a signal passes through the fourth RF connection point 105 and the sixth RF connection point 107.

[0052] like Figure 8 As shown, an isolation wall 109 is provided around the gap 108 , and the isolation wall 109 isolates the third RF connection point 104 from the second RF connection point 103 and the fourth RF connection point 105 at a greater distance, thereby improving the isolation effect.

[0053] In conventional designs, the isolation ribs are in direct contact with the RF cavity, e.g. Fig. 9 In a specific embodiment of the present invention, in order to further improve the electromagnetic shielding effect, as shown in FIG. Fig.10 , Fig.11 and Fig.12 As shown, a U-shaped groove 208 is provided at the isolation wall 109 or the RF cavity 2 in contact with the isolation rib 302, and the isolation rib 302 is embedded in the U-shaped groove 208. The U-shaped groove 208 is used to replace the conventional right-angle groove, which further improves the electromagnetic shielding effect; compared with the conventional design, the U-shaped groove 208 is used for transition, so that the gap length between the isolation rib 302 and the isolation wall 109 or the RF cavity 2 is increased by 1.5 times, and electromagnetic shielding is effectively performed.

[0054] In a specific embodiment of the present invention, Figure 3 As shown, a connector connected to the normally on RF connection point and the intermittent RF connection point is provided on the side of the RF cavity 2, and the connector includes a power connector 204, a communication connector, an SMA connector 206 and a coupling connector 207. In this embodiment, the communication connector is an Ethernet connector 205.

[0055] In order to further improve the electromagnetic shielding effect, copper exposed areas 101 and corresponding isolation ribs 302 are provided on both sides of the particularly sensitive device of the C-band multi-link radio frequency board 1, and the isolation ribs 302 are in a "I" shape. Compared with the "L"-shaped isolation ribs 302, the "I"-shaped isolation ribs 302 have a better electromagnetic shielding effect.

[0056] What is disclosed above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, which should be covered within the protection scope of the present invention.

Claims

1. An electromagnetic shielding structure applied to a C-band multi-link radio frequency board, wherein the C-band multi-link radio frequency board is arranged in a concave cavity of a radio frequency cavity, and different links on the C-band multi-link radio frequency board are isolated by an isolation structure, characterized in that: The electromagnetic shielding structure comprises: A radio frequency cover plate provided on the concave cavity of the radio frequency cavity, the radio frequency cover plate comprising a substrate and isolation ribs provided on the substrate, the isolation ribs corresponding to the isolation structures one by one, and a sealing groove is provided on each of the isolation ribs, and a first electromagnetic shielding sealing strip for sealing a gap between the isolation ribs and the corresponding isolation structure is provided in the sealing groove; A second electromagnetic shielding sealing strip along the periphery of the RF cover and provided between the RF cover and the RF cavity; An upper cover plate disposed on the radio frequency cover plate; and a third electromagnetic shielding sealing strip along the periphery of the upper cover plate and arranged between the upper cover plate and the radio frequency cavity; Gaps are provided on both sides of the normally-on RF connection point of the C-band multi-link RF board, and the intermittent RF connection points of the C-band multi-link RF board are arranged on both sides of the gap of the normally-on RF connection point, and two intermittent RF connection points that do not work at the same time are arranged adjacent to each other; Among them, the normally-on RF connection point refers to a RF connection point when it is working, that is, a signal passes through it; the intermittent RF connection point refers to a RF connection point that is turned on and off according to working needs.

2. The electromagnetic shielding structure applied to the C-band multi-link radio frequency board according to claim 1 is characterized in that: The fixing holes on the isolation rib are located on one side or both sides of the sealing groove, and the sealing groove on the isolation rib is a continuous groove.

3. The electromagnetic shielding structure applied to a C-band multi-link radio frequency board according to claim 1, characterized in that: The isolation structure is a copper exposed area.

4. The electromagnetic shielding structure applied to a C-band multi-link radio frequency board according to claim 1, characterized in that: The electromagnetic shielding structure also includes a lower cover plate arranged at the bottom of the radio frequency cavity.

5. The electromagnetic shielding structure applied to a C-band multi-link radio frequency board according to claim 1, characterized in that: A separation wall is arranged around the gap.

6. The electromagnetic shielding structure applied to a C-band multi-link radio frequency board according to claim 5, characterized in that: A U-shaped groove is provided at the isolation wall or the radio frequency cavity in contact with the isolation rib, and the isolation rib is embedded in the U-shaped groove.

7. The electromagnetic shielding structure applied to a C-band multi-link radio frequency board according to claim 1, characterized in that: Connectors connected to the normally on RF connection points and the intermittent RF connection points are provided on the side of the RF cavity, and the connectors include a power connector, a communication connector, an SMA connector and a coupling connector.

8. A radio frequency product, characterized in that: The radio frequency product includes the electromagnetic shielding structure as described in any one of claims 1 to 7.

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