Shielding structure and system with interference suppression function

Abstract

The present application provides a shielding structure and system with interference suppression function, including: an electromagnetic shielding layer, a honeycomb absorbing layer, a conductive foam shielding pad, and an external measurement system arrow antenna; the electromagnetic shielding layer forms a closed cover-like structure, the electromagnetic shielding layer is bonded with a honeycomb absorbing layer on all sides, and the conductive foam shielding pad is installed at the edges of the bottom of the electromagnetic shielding layer; the honeycomb absorbing layer is sequentially distributed along the propagation direction of the interference signal: a transparent layer, an absorbing layer, and a reflecting layer, and the interference signal passes through the transparent layer and is absorbed by the absorbing layer, and the other part passes through the absorbing layer and is reflected back to the absorbing layer by the reflecting layer, and the interference signal undergoes multi-layer attenuation in the closed space surrounded by the electromagnetic shielding layer, the honeycomb absorbing layer, and the conductive foam shielding pad. The present application enhances the absorption and weakening effect of the device on electromagnetic waves and improves the signal purification efficiency through the layered setting of the honeycomb absorbing layer.

Description

Technical Field

[0001] The present application relates to the technical field of wireless signal isolation, and in particular to a shielding structure and system with interference suppression function. Background Art

[0002] At present, multiple types of launch vehicles are conducting integrated comprehensive tests in the same factory or in factories that are close to each other. The wireless signal point frequencies of the RF products on the rockets of their measurement systems are the same. When multiple models are tested in parallel, the same frequency signals will interfere with each other. The same frequency interference phenomenon brings many problems: first, the main channel of the ground wireless signal receiving equipment may receive the signal of the same frequency signal source, thereby affecting the reception, processing and display of the RF signal; second, the interpretation personnel cannot accurately judge the real working status of the rocket and ground products, and it is very likely that the design defects of the product itself will be misjudged as an accidental phenomenon affected by the complex electromagnetic environment of the factory; third, when the RF products are subject to multipath or other electromagnetic interference, the current of some products such as pulse coherent transponders will increase suddenly, causing product damage. The existing solution is that when the back-end measurement command monitors that the signal strength is unstable or lost for a long time, it notifies the measurement front-end to manually or through the gimbal to adjust the pitch or horizontal position of the ground antenna. This method has a certain radiation risk to the human body and cannot assist the interpretation personnel to accurately judge whether the ground antenna is at the optimal azimuth. In the subsequent test process, there may be abnormal data interpretation results due to the signal being still unstable after manual adjustment of the ground antenna. A lot of time is wasted on repeatedly adjusting the antenna, affecting the test process, efficiency and work reliability.

[0003] The prior art with patent number CN210157583U discloses a wireless signal isolation device. The prior art discloses equipment, systems and methods associated with isolation to avoid interference from wireless signals in circuit components. In an embodiment, the wireless signal isolation component may include an outer shielding structure, which is used to enclose the circuit system of the circuit board to be isolated from interference, wherein the outer shielding structure is used to attenuate the wireless signal. The wireless signal isolation component may also include a first inner shielding structure located within the outer shielding structure, the first inner shielding structure is used to enclose the first circuit, wherein the first inner shielding structure is used to attenuate the wireless signal. The wireless signal isolation component may also include a second inner shielding structure located within the outer shielding structure, the second inner shielding structure is used to enclose the second circuit, wherein the second inner shielding structure is used to attenuate the wireless signal. The disadvantage of the prior art is that the shielding layer is set in a single manner and the shielding efficiency of the shielding layer is low. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present application is to provide a shielding structure with interference suppression function.

[0005] A shielding structure with interference suppression function provided by the present application includes: an electromagnetic shielding layer, a honeycomb absorbing layer and a conductive foam shielding pad;

[0006] The electromagnetic shielding layer forms a closed cover-like structure, the inside of the electromagnetic shielding layer is bonded with a honeycomb absorbing layer on all sides, and the conductive foam shielding pad is installed on the edges around the bottom of the electromagnetic shielding layer;

[0007] The honeycomb absorbing layer is sequentially distributed with: a wave-transmitting layer, a wave-absorbing layer and a reflecting layer along the propagation direction of the interference signal. After the interference signal passes through the wave-transmitting layer, a part of it is absorbed by the wave-absorbing layer, and the other part passes through the wave-absorbing layer and is reflected back to the wave-absorbing layer by the reflecting layer. The interference signal undergoes multi-layer attenuation in the closed space surrounded by the electromagnetic shielding layer, the honeycomb absorbing layer and the conductive foam shielding pad;

[0008] The arrow antenna of the external measurement system is arranged inside the honeycomb absorbing layer. The shape of the arrow antenna of the external measurement system is a boss. The contact part of the boss of the honeycomb absorbing layer and the arrow antenna of the external measurement system is connected in a step design.

[0009] Preferably, the honeycomb absorbing layer is nested and bonded to the electromagnetic shielding layer by high-adhesion epoxy glue.

[0010] Preferably, the conductive foam shielding pad is bonded to the edges around the bottom of the electromagnetic shielding layer by means of pressure-sensitive double-sided adhesive.

[0011] Preferably, it also includes a transceiver antenna, which is embedded in a closed space surrounded by the electromagnetic shielding layer, the honeycomb absorbing layer and the conductive foam shielding pad and is located at the bottom relative to the conductive foam shielding pad;

[0012] The transceiver antenna is in contact with the inner wall of the honeycomb wave absorbing layer.

[0013] Preferably, it also includes a handle arranged on the outer wall of the electromagnetic shielding layer;

[0014] The electromagnetic shielding layer is a 1 mm thick galvanized steel plate, and the seams of the galvanized steel plate are welded.

[0015] Preferably, the honeycomb absorbing layer adopts a three-layer absorbing honeycomb core with continuously gradient impedance and a thickness of 25 mm.

[0016] Preferably, the axial distance between the transceiver antenna and the antenna on the arrow of the external measurement system is greater than or equal to 10 cm.

[0017] Preferably, a copper mesh pad is provided on the contact surface between the transceiver antenna and the electromagnetic shielding layer.

[0018] The present application also provides a system with interference suppression function, including the above-mentioned shielding structure with interference suppression function.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] 1. This application enhances the absorption and weakening effect of the device on electromagnetic waves and improves the signal purification efficiency through the layered setting of the honeycomb absorbing layer.

[0021] 2. This application isolates external co-frequency interference or other electromagnetic interference and weakens internal electromagnetic echoes to ensure the stability of the test process and improve test efficiency and work reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0023] Figure 1 This is a schematic diagram of the installation structure of the shielding structure with interference suppression function mainly embodied in this application;

[0024] Figure 2 This is a schematic diagram of the front plan structure of the shielding structure with interference suppression function mainly embodied in this application;

[0025] Figure 3 This is a schematic diagram of a top-down plan structure of a shielding structure with interference suppression function, which is mainly embodied in this application.

[0026] As shown in the figure: 1. Electromagnetic shielding layer; 2. Honeycomb absorbing layer; 3. Conductive foam shielding pad; 4. Transceiver antenna; 5. External measurement system arrow antenna; 6. Ground high-frequency cable; 7. Ground comprehensive tester. DETAILED DESCRIPTION

[0027] The present application is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present application. These all belong to the protection scope of the present application.

[0028] The shielding structure with interference suppression function provided by the present application comprises: an electromagnetic shielding layer 1, a honeycomb absorbing layer 2 and a conductive foam shielding pad 3;

[0029] The electromagnetic shielding layer 1 forms a closed cover-like structure, and the honeycomb absorbing layer 2 is bonded on all sides of the inside of the electromagnetic shielding layer 1, and the conductive foam shielding pad 3 is installed on the edges of the bottom of the electromagnetic shielding layer 1; the honeycomb absorbing layer 2 is distributed in sequence along the propagation direction of the interference signal: a transparent layer, an absorbing layer and a reflecting layer. After the interference signal passes through the transparent layer, a part of it is absorbed by the absorbing layer, and the other part passes through the absorbing layer and is reflected back to the absorbing layer by the reflecting layer. The interference signal undergoes multi-layer attenuation in the closed space surrounded by the electromagnetic shielding layer 1, the honeycomb absorbing layer 2 and the conductive foam shielding pad 3.

[0030] The honeycomb absorbing layer 2 is nested and bonded with the electromagnetic shielding layer 1 by high-adhesion epoxy glue. The conductive foam shielding pad 3 is bonded to the edges around the bottom of the electromagnetic shielding layer 1 by pressure-sensitive double-sided adhesive.

[0031] According to the shielding structure with interference suppression function provided by the present application, it also includes a transceiver antenna 4, which is embedded in a closed space surrounded by the electromagnetic shielding layer 1, the honeycomb absorbing layer 2 and the conductive foam shielding pad 3 and is located at the bottom relative to the conductive foam shielding pad 3; the transceiver antenna 4 is in contact with the inner wall of the honeycomb absorbing layer 2.

[0032] According to the shielding structure with interference suppression function provided by the present application, the arrow-on antenna 5 of the external measurement system is arranged inside the honeycomb absorbing layer 2, and the arrow-on antenna 5 of the external measurement system is shaped like a boss. The contact part of the boss between the honeycomb absorbing layer 2 and the external measurement system arrow-on antenna 5 is connected in a step design.

[0033] According to the shielding structure with interference suppression function provided by the present application, it also includes a handle arranged on the outer wall of the electromagnetic shielding layer 1; the electromagnetic shielding layer 1 is a 1mm galvanized steel plate, and the seams of the galvanized steel plate are welded. The absorbing layer of the honeycomb absorbing layer 2 adopts a three-layer absorbing honeycomb core with continuous impedance gradient and a thickness of 25mm. The axial distance between the transceiver antenna 4 and the arrow antenna 5 of the external measurement system is greater than or equal to 10cm. The contact surface between the transceiver antenna 4 and the electromagnetic shielding layer 1 is provided with a copper mesh pad.

[0034] The present application also provides a system with interference suppression function, which adopts the shielding structure with interference suppression function provided by the present application.

[0035] Specifically, a feasible embodiment is provided for the present application below.

[0036] like Figure 1As shown, the wireless signal transmitted by the ground integrated tester 7 in the uplink passes through the attenuation of the ground high-frequency cable 6, the gain of the transceiver antenna 4, the free space loss inside the shielding structure, and the gain of the arrow antenna 5 of the external measurement system in sequence, and the output power is within the receiving sensitivity and dynamic range of the RF stand-alone machine, and a 10-20dB link margin is left. The electromagnetic shielding layer 1 in the uplink can isolate external co-frequency interference to ensure that only one wireless signal can be received by the arrow antenna 5 of the external measurement system; the wireless signal transmitted by the RF stand-alone machine in the downlink passes through the gain of the arrow antenna 5 of the external measurement system, the free space loss inside the shielding structure, the gain of the transceiver antenna 4, and the ground high-frequency cable 6. The output power is within the receiving sensitivity and dynamic range of the ground integrated tester 7. The cellular absorbing layer 2 in the downlink can weaken the internal electromagnetic echo to avoid damage to the internal components of the RF stand-alone machine.

[0037] The electromagnetic shielding layer 1 is made of galvanized steel plate with a thickness of 1 mm and welded at the seams to ensure that no electromagnetic signal leakage occurs at the seams. It has good electromagnetic shielding performance and the isolation of the shielding structure is greater than or equal to 80 dB.

[0038] The honeycomb absorbing layer 2 includes a wave-transmitting layer, a wave-absorbing layer and a reflecting layer. The wave-transmitting layer matches the impedance of the free space and the wave-absorbing layer to a certain extent, so that the incident wave is transmitted to the wave-absorbing layer as much as possible; the wave-absorbing layer adopts a three-layer wave-absorbing honeycomb core with a continuous gradient impedance and a thickness of 25 mm. The energy of the incident wave is greatly attenuated after multiple absorption, reflection and scattering in the wave-absorbing layer, and the reflectivity is not greater than -20 dB in the S and C frequency bands; the reflecting layer reflects a small amount of incident waves that penetrate the wave-absorbing layer back to the wave-absorbing layer, thereby achieving secondary loss and preventing electromagnetic waves from being reflected into the inside of the RF unit.

[0039] After the transceiver antenna 4 is fixed to the shielding structure, the axial distance between the antenna 5 on the arrow of the external measurement system is greater than or equal to 10 cm.

[0040] The conductive foam shielding pad 3 is fixed between the electromagnetic shielding layer 1 and the arrow body by pressure-sensitive double-sided adhesive. It has a certain elasticity to ensure close fit with the arrow body, and works together with the electromagnetic shielding layer 1 to prevent electromagnetic shielding leakage caused by gaps, so as to achieve a shielding structure isolation greater than or equal to 80dB.

[0041] The honeycomb absorbing layer 2 and the honeycomb absorbing material of the boss part of the arrow antenna 5 of the external measurement system adopt a step design to increase the fit and work together with the honeycomb absorbing layer 2 to achieve a reflectivity of no more than -20dB in the S and C bands.

[0042] The edges around the transceiver antenna 4 are reinforced with copper mesh pads to reduce electromagnetic shielding leakage.

[0043] The manufacturing and installation steps of the shielding structure with interference suppression function provided in the present application include:

[0044] Step 1: Open two waist-shaped mounting holes on the left and right bottom sides of the electromagnetic shielding layer 1;

[0045] Step 2: Align the two waist-shaped mounting holes on the left and right bottom sides of the electromagnetic shielding layer 1 with the mounting holes on both sides of the arrow antenna 5 of the external measurement system;

[0046] Step 3: Fit the conductive foam shielding pad 3 tightly to the contact surface of the arrow body, and then fix it with screws;

[0047] Step 4: Connect one end of the ground high-frequency cable 6 to the ground comprehensive tester 7, and the other end to the exposed connector of the transceiver antenna 4, and confirm that the connection is in place.

[0048] Compared with the prior art, the shielding structure physical isolation device with wireless interference suppression function described in the present invention can not only isolate external co-frequency interference and other electromagnetic interference, and solve the problem that the RF stand-alone signal is unstable or even lost when the measurement system is subjected to external interference during integrated comprehensive tests; it can also weaken internal electromagnetic echoes, and avoid damage to RF stand-alone devices on the arrow due to excessive electromagnetic echoes inside the shielding structure; it can further replace the traditional test method of manually adjusting the ground antenna, greatly reducing manpower and time costs, and improving test efficiency and work reliability.

[0049] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] The above describes the specific embodiments of the present application. It should be understood that the present application is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the substantive content of the present application. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A shielding structure with interference suppression function, characterized in that: include: An electromagnetic shielding layer (1), a honeycomb absorbing layer (2), a conductive foam shielding pad (3), and an external measurement system arrow antenna (5); The electromagnetic shielding layer (1) forms a closed cover-shaped structure, the electromagnetic shielding layer (1) is bonded with a honeycomb absorbing layer (2) on all sides thereof, and the conductive foam shielding pad (3) is installed on all sides of the bottom of the electromagnetic shielding layer (1); The honeycomb wave absorbing layer (2) is sequentially distributed with: a wave-transmitting layer, a wave-absorbing layer and a reflective layer along the propagation direction of the interference signal; after the interference signal passes through the wave-transmitting layer, a part of it is absorbed by the wave-absorbing layer, and the other part passes through the wave-absorbing layer and is reflected back to the wave-absorbing layer by the reflective layer; The interference signal undergoes multi-layer attenuation in the closed space surrounded by the electromagnetic shielding layer (1), the honeycomb wave absorbing layer (2) and the conductive foam shielding pad (3); The external measurement system arrow antenna (5) is arranged inside the honeycomb absorbing layer (2); the external measurement system arrow antenna (5) is shaped like a boss; the honeycomb absorbing layer (2) and the boss contact portion of the external measurement system arrow antenna (5) are connected in a step design.

2. The shielding structure with interference suppression function as claimed in claim 1, characterized in that: The honeycomb wave absorbing layer (2) is nested and bonded to the electromagnetic shielding layer (1) by means of high-adhesion epoxy glue.

3. The shielding structure with interference suppression function as claimed in claim 2, characterized in that: The conductive foam shielding pad (3) is bonded to the edges around the bottom of the electromagnetic shielding layer (1) by means of a pressure-sensitive double-sided adhesive.

4. The shielding structure with interference suppression function according to claim 1, characterized in that: It also includes a transceiver antenna (4), which is embedded in a closed space surrounded by the electromagnetic shielding layer (1), the honeycomb wave absorbing layer (2) and the conductive foam shielding pad (3) and is located at the bottom relative to the conductive foam shielding pad (3); The transceiver antenna (4) is in contact with the inner wall of the honeycomb wave absorbing layer (2).

5. The shielding structure with interference suppression function according to claim 1, characterized in that: It also includes a handle arranged on the outer wall of the electromagnetic shielding layer (1); The electromagnetic shielding layer (1) is a 1 mm thick galvanized steel plate, and the seams of the galvanized steel plate are welded.

6. The shielding structure with interference suppression function according to claim 1, characterized in that: The honeycomb wave absorbing layer (2) adopts a three-layer wave absorbing honeycomb core with continuously gradient impedance and a thickness of 25 mm.

7. The shielding structure with interference suppression function as claimed in claim 4, characterized in that: The axial distance between the transceiver antenna (4) and the external measurement system arrow antenna (5) is greater than or equal to 10 cm.

8. The shielding structure with interference suppression function as claimed in claim 4, characterized in that: A copper mesh pad is provided on the contact surface between the transceiver antenna (4) and the electromagnetic shielding layer (1).

9. A system with interference suppression function, characterized in that: It comprises a shielding structure with interference suppression function as described in any one of claims 1 to 8.

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