CN218104064U - Shielding filtering structure - Google Patents

Abstract

The utility model belongs to the technical field of sealed shield, concretely relates to shielding filtering structure. The utility model discloses a shielding filtering structure includes: a ventilation board; a signal filter disposed inside the ventilation board; the ventilation waveguide window is arranged on the ventilation plate in a penetrating mode and is positioned on one side of the signal filter; wherein the ventilation waveguide window comprises: the window frame is arranged on the ventilating plate in a penetrating way; the plurality of adjacent connected cut-off waveguide tubes are transversely stacked in the window frame, and two ends of each cut-off waveguide tube face to two sides of the ventilation plate respectively; and each of the cutoff waveguides has a hexagonal cross section. The utility model discloses a shielding filtering structure, through combining ventilation waveguide window and signal filter, electromagnetic signal is through signal filter filtering treatment, clears away the electromagnetic signal of partial wave form, and the electromagnetic signal of remaining wave form is the hexagonal ending waveguide pipe through each cross-section of ventilation waveguide window again, effectively ends passing through of the electromagnetic signal of corresponding wave form, ensures the shielding performance of whole equipment.

Description

Shielding and filtering structure

Technical Field

The utility model belongs to the technical field of sealed shield, concretely relates to shielding filtering structure.

Background

In order to keep the sealed equipment in air circulation, ventilation windows need to be arranged on ventilation plates of the equipment, and the ventilation windows need to ensure the air circulation and prevent the leakage of electromagnetic signals. The ventilation window is typically fitted with a waveguide window that meets the response criteria.

However, the conventional waveguide window is only simple in electromagnetic wave isolation, and can allow propagation of a partial-wave electromagnetic signal, so that the shielding effect is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a shielding filtering structure to solve traditional waveguide window and can allow the propagation of the electromagnetic signal of partial wave mode, the not good technical problem of shielding effect.

In order to solve the technical problem, the utility model provides a shielding and filtering structure, include: a ventilation board; a signal filter disposed inside the ventilation board; the ventilation waveguide window is arranged on the ventilation plate in a penetrating mode and is positioned on one side of the signal filter; wherein the vented waveguide window comprises: the window frame is arranged on the ventilating plate in a penetrating way; the plurality of adjacent connected cut-off waveguide tubes are transversely stacked in the window frame, and two ends of each cut-off waveguide tube face to two sides of the ventilation plate respectively; and each of the cutoff waveguides has a hexagonal cross section.

Further, the area proportion of the ventilation waveguide window in the ventilation plate is 15% -18%.

Furthermore, the ventilation board and the ventilation waveguide window are both square; and the ventilation waveguide window is located at the center of the ventilation board.

Further, the distance from the side edge of the signal filter to the nearest side edge of the window frame is 17 mm-19 mm.

Furthermore, the cutoff waveguides are connected through brazing, and no gap exists between the adjacent cutoff waveguides.

Further, the signal filter includes: the filter body is arranged on the inner side of the ventilating plate; the input cable is connected with the filter body and used for transmitting the electromagnetic signal to the filter body; and the end part of the output cable penetrates through the ventilation plate to be connected with the filter body and is used for outputting the electromagnetic signals filtered by the filter body.

Further, the signal filter is connected with the ventilation board through a directional wire shielding gasket.

Further, the size of the ventilating plate is as follows: 300 mm. Times.300 mm. Times.3 mm.

Further, the dimensions of the ventilation waveguide window 3 are: 121mm X3 mm.

Further, the dimensions of the filter body 21 are: 142mm by 40mm by 48mm.

The beneficial effects of the utility model are that, the utility model discloses a shielding filtering structure, through will ventilating waveguide window and signal filter combination, electromagnetic signal is through signal filter filtering treatment, clears away the electromagnetic signal of partial wave form, and the electromagnetic signal of remaining wave form passes through each cross-section of ventilating waveguide window again and is the hexagonal by the waveguide pipe, effectively ends passing through of corresponding wave form electromagnetic signal, ensures the shielding performance of whole equipment.

Additional features and advantages of the invention 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 invention.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a front view of a preferred embodiment of the shielding filter structure of the present invention;

fig. 2 is a perspective view of a preferred embodiment of the shielding filter structure of the present invention;

fig. 3 is a left side view of a preferred embodiment of the shielded filtering structure of the present invention;

fig. 4 is a rear view of a preferred embodiment of the shielded filtering structure of the present invention.

In the figure:

a ventilation board 1;

a signal filter 2, a filter body 21, an input cable 22, an output cable 23;

a ventilation waveguide window 3, a window frame 31, a cut-off waveguide 32;

and a fastener 4.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

Examples

As shown in fig. 1 and fig. 2, the shielding filter structure of the present embodiment includes: a ventilation board 1, a signal filter 2 and a ventilation waveguide window 3; wherein, the signal filter 2 is arranged at the inner side of the ventilating board 1; the ventilation waveguide window 3 is arranged on the ventilation plate 1 in a penetrating mode and is located on one side of the signal filter 2; the ventilation waveguide window 3 includes: a window frame 31, and a plurality of adjacently connected cutoff waveguides 32; the window frame 31 is arranged on the ventilating board 1 in a penetrating way; each cutoff waveguide 32 is stacked laterally in the window frame 31, and both ends of the cutoff waveguide 32 face both sides of the ventilation board 1, respectively; and each cutoff waveguide 32 has a hexagonal cross section. By combining the ventilation waveguide window 3 with the signal filter 2, the electromagnetic signals are filtered by the signal filter 2, part of the wave-type electromagnetic signals are removed, and the rest of the wave-type electromagnetic signals pass through the cut-off waveguide tubes 32 with hexagonal sections of the ventilation waveguide window 3, so that the passing through of the corresponding wave-type electromagnetic signals is effectively cut off, and the shielding performance of the whole equipment is ensured.

As shown in fig. 1, in the present embodiment, the area ratio of the ventilation waveguide window 3 to the ventilation board 1 is preferably 15% to 18%, and the size ratio of the ventilation waveguide window and the ventilation board is reasonably designed to achieve good shielding performance while ensuring sealing.

As shown in fig. 1, in the present embodiment, it is preferable that the ventilation board 1 and the ventilation waveguide window 3 each have a square shape; and the ventilation waveguide window 3 is located in the center of the ventilation board 1.

As shown in fig. 1, in the present embodiment, the distance from the side of the signal filter 2 to the nearest side of the window frame 31 is 17mm to 19mm.

As shown in fig. 2, in the present embodiment, it is preferable that the cutoff waveguides 32 are connected by brazing, and no gap is formed between the adjacent cutoff waveguides 32. The cut-off waveguide tube 32 is formed by connecting six waveguide sheets into a hexagonal cylinder by vacuum brazing, and no gap is formed at the hexagonal joint, so that the shielding performance is greatly improved.

As shown in fig. 2 and 3, in the present embodiment, specifically, the signal filter 2 includes: a filter body 21, an input cable 22 and an output cable 23; wherein the filter body 21 is arranged inside the ventilation board 1; the input cable 22 is connected with the filter body 21 and used for transmitting electromagnetic signals to the filter body 21; an end of the output cable 23 is connected to the filter body 21 through the ventilation board 1 to output the electromagnetic signal filtered by the filter body 21.

As shown in fig. 1, in the present embodiment, the signal filter 2 is connected to the ventilation board 1 via a directional wire shield gasket, which solves the problem of the shield and conductive connection of the signal filter 2 to the installation gap of the ventilation board 1.

As shown in fig. 1 and 4, in the present embodiment, it is preferable that the ventilation board 1 has the dimensions: 300mm is multiplied by 3mm, and the device has small volume, light weight and strong installation performance.

As shown in fig. 1 and 4, in the present embodiment, it is preferable that the size of the ventilation waveguide window 3 is: 121 mm. Times.121 mm. Times.3 mm. The larger the area of the ventilation waveguide window 3, the larger the number of holes of the cutoff waveguide 32, and the lower the shielding performance without changing the thickness of the cutoff waveguide 32. The number of holes of the cutoff waveguide 32 of the ventilation waveguide window 3 having an area of 200 × 200mm2 is about 3500 (W =3.67 mm), and the shielding effectiveness is reduced by as much as 71dB. And with the ventilation waveguide window 3 of 121mm × 121mm × 3mm, the shielding effectiveness: more than or equal to 80dB (150 kHz-10 GHz).

As shown in fig. 1 and 3, in the present embodiment, it is preferable that the size of the filter body 21 is: 142mm by 40mm by 48mm. The signal filter 2 may employ a normalized 7 th order chebyshev-type low-pass filter circuit, such as the filter SNF101B5 × 2000.

As shown in fig. 4, in the present embodiment, the filter body 21 is fixedly mounted on the inner side of the ventilation board 1 via at least one fastening member 4. Preferably, the fasteners 4 are six and are arranged in a rectangular array of 2 columns and 3 rows; wherein the row spacing of the fasteners 4 is 23mm; the row spacing of fasteners 4 is 60mm.

As shown in fig. 4, in the present embodiment, it is preferable that the fastener 4 employs a countersunk head screw M3 × 8.

To sum up use the utility model discloses a shielding filtering structure, through combining ventilation waveguide window and signal filter, electromagnetic signal is through signal filter filtering treatment, clears away the electromagnetic signal of partial wave form, and the electromagnetic signal of remaining wave form passes through each cross-section of ventilation waveguide window again and is the hexagonal cut-off waveguide pipe, effectively ends passing through of the electromagnetic signal of corresponding wave form, ensures the shielding performance of whole equipment. The area proportion of the ventilation waveguide window in the ventilation plate is 15% -18%, and the size proportion of the ventilation waveguide window and the ventilation plate is reasonably planned so as to achieve good shielding performance while ensuring sealing. The cut-off waveguide tube is formed by connecting six waveguide sheets into a hexagonal cylinder through vacuum brazing, and the hexagonal joint is seamless, so that the shielding performance is greatly improved.

The components (components without specific structures) selected for use in the present application are all common standard components or components known to those skilled in the art, and the structures and principles thereof can be known to those skilled in the art through technical manuals or through routine experimental methods.

In the description of the embodiments of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or component to which the reference is made must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the description, and must be determined according to the scope of the claims.

Claims (10)

1. A shielded filtering structure, comprising:

a ventilation board (1);

a signal filter (2) disposed inside the ventilation board (1);

the ventilation waveguide window (3) is arranged on the ventilation plate (1) in a penetrating mode and is positioned on one side of the signal filter (2); wherein

The ventilation waveguide window (3) comprises:

the window frame (31) is arranged on the ventilating plate (1) in a penetrating mode;

a plurality of adjacently connected cut-off waveguides (32) which are transversely stacked in the window frame (31) and two ends of which respectively face to two sides of the ventilation board (1); and

each of the cutoff waveguides (32) has a hexagonal cross section.

2. The shielding filter structure of claim 1,

the area proportion of the ventilation waveguide window (3) in the ventilation plate (1) is 15% -18%.

3. The shielding filter structure of claim 2,

the ventilation plate (1) and the ventilation waveguide window (3) are square; and

the ventilation waveguide window (3) is positioned in the center of the ventilation plate (1).

4. The shielding filter structure of claim 2,

the distance from the side edge of the signal filter (2) to the nearest side edge of the window frame (31) is 17-19 mm.

5. The shielding filter structure of claim 1,

the cutoff waveguides (32) are connected by brazing, and no gap is formed between the adjacent cutoff waveguides (32).

6. The shielding filter structure of claim 1,

the signal filter (2) comprises:

a filter body (21) provided inside the ventilation board (1);

an input cable (22) connected to the filter body (21) and configured to transmit an electromagnetic signal to the filter body (21);

and the end part of the output cable (23) passes through the ventilation plate (1) and is connected with the filter body (21) so as to output the electromagnetic signals filtered by the filter body (21).

7. The shielding filter structure of claim 1,

the signal filter (2) is connected with the ventilating plate (1) through a directional metal wire shielding gasket.

8. The shielding filter structure of claim 3,

the dimensions of the ventilation board (1) are as follows: 300 mm. Times.300 mm. Times.3 mm.

9. The shielding filter structure of claim 3,

the dimensions of the ventilation waveguide window (3) are: 121mm X3 mm.

10. The shielding filter structure of claim 6,

the dimensions of the filter body (21) are: 142mm X40 mm X48 mm.

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