CN111163625B - Semi-anechoic chamber and its floor structure - Google Patents

Abstract

A floor structure of a semi-anechoic chamber, comprising a reflection plate and a grounding structure, the reflection plate has a first metal layer, a second metal layer and an insulating layer, the insulating layer has a through hole so that the upper and lower layers of the insulating layer The first metal layer and the second metal layer on the two sides can be electrically connected, and the ground structure is connected to the second metal layer, so that the current on the first metal layer and the second metal layer can flow to the ground.

Description

Semi-anechoic chamber and its floor structure

technical field

The present invention relates to a semi-anechoic chamber, in particular to a floor structure of the semi-anechoic chamber.

Background technique

Electronic devices may be interfered by surrounding electromagnetic waves and cannot function normally. To solve the problem of electromagnetic interference, electromagnetic compatibility (ElectroMagnetic Compatibility; EMC) tests are usually carried out before products are launched. This test is usually carried out in a laboratory that meets the requirements. , such as a semi-anechoic chamber.

FIG. 1 shows a top view of a conventional semi-anechoic chamber 100, which is a hexahedral space formed by a wall 102, a ceiling (not shown) and a floor, wherein the wall 102 and the ceiling are provided with materials that absorb electromagnetic waves to prevent electromagnetic waves from being affected by electromagnetic waves. The reflection from the wall 102 or the ceiling affects the test results. The floor is formed by splicing a plurality of reflectors 104 to simulate an infinite metal ground plane. The semi-anechoic chamber 100 will have an electromagnetic wave emitting area 106 for setting the electromagnetic wave emitting device and a The electromagnetic wave receiving area 108 is provided with an electromagnetic wave receiving device. When the electromagnetic wave emitted by the electromagnetic wave transmitting device (not shown in the figure) in the electromagnetic wave transmitting area 106 is transmitted to the reflecting plate 104, it will be reflected by the reflecting plate 104, and at the same time, the reflecting plate 104 will generate The current I1, the current I1 will flow to the wall 102, and then flow to the ground GND through the wall 102.

FIG. 2 shows a partial cross-sectional view of the semi-anechoic chamber 100 of FIG. 1 . Each reflector 104 includes an insulating layer 1044 and two metal layers 1042 and 1046 on two sides of the insulating layer 1044 respectively, and an upper surface is used between the reflectors 104 . The board 110, the lower board 112 and a screw 114 form a joint structure for connection. There is an L-shaped support frame 116 on the wall 102 to support the adjacent reflector 104. The reflector 104 adjacent to the wall 102 can use a metal wire 118 connects the metal layer 1042 to the wall surface 102 , and both the support frame 116 and the metal wire 118 enable the current on the reflector 104 to flow to the wall surface 102 .

As shown in FIG. 2 , when a current I1 is generated on one of the reflectors 104 in FIG. 1 , the current I1 will flow through the joint structure between the reflectors 104 to the adjacent reflector 104 , and finally flow to the wall 102 , and then flow through the joint structure between the reflectors 104 to the adjacent reflector 104 The wall 102 flows to the ground GND.

However, the conventional semi-anechoic chamber 100 allows the current I1 to flow to the surrounding walls 102, and then flows to the ground GND through the walls 102, resulting in a poor grounding effect, which in turn affects the low-frequency (eg, 30MHz-300MHz) characteristic test.

SUMMARY OF THE INVENTION

One of the objectives of the present invention is to provide a floor structure of a semi-anechoic chamber.

One of the objectives of the present invention is to provide a semi-anechoic chamber with improved grounding effect.

According to the present invention, a floor structure of a semi-anechoic chamber includes a reflector having a first metal layer, a second metal layer and an insulating layer. The insulating layer is between the first metal layer and the second metal layer, and the insulating layer has a through hole through which the current on the first metal layer can flow to the second metal layer. The floor structure further includes a ground structure connected to the second metal layer, so that the current on the second metal layer flows to the ground.

According to the present invention, a semi-anechoic chamber includes a plurality of reflection plates and a plurality of ground structures, and the plurality of ground structures are respectively connected to the plurality of reflection plates, so that the currents on the plurality of reflection plates flow to the ground. Since each reflector can be connected to the ground through the grounding structure connected thereto, the semi-electric darkroom has a better grounding effect, which can improve the test of low frequency characteristics.

Description of drawings

Figure 1 shows a top view of a conventional semi-anechoic chamber.

Figure 2 shows a partial cross-sectional view of a conventional semi-anechoic chamber.

Figure 3 shows the floor structure of the present invention.

Fig. 4 shows a cross-sectional view in the direction AA' of Fig. 3 .

Fig. 5 shows the first embodiment of the semi-anechoic chamber of the present invention.

FIG. 6 shows a cross-sectional view of a portion of the area in FIG. 5 .

Figure 7 shows a second embodiment of the semi-anechoic chamber of the present invention.

FIG. 8 shows a third embodiment of the semi-anechoic chamber of the present invention.

List of reference signs: 100-semi-anechoic chamber; 102-wall surface; 104-reflector plate; 1042-metal layer; 1044-insulation layer; 1046-metal layer; Upper plate; 112-lower plate; 114-screw; 116-support frame; 118-metal wire; 200-floor structure; 202-reflector; 2022-metal layer; 2024-insulation layer; 2026-metal layer; 204-pass Hole; 206-grounding structure; 300-semi-anechoic chamber; 302-wall; 304-electromagnetic wave transmitting area; 306-electromagnetic wave receiving area; 308-main reflection area; 310-main reflection area; 312-main reflection area; 314- main reflection area.

Detailed ways

FIG. 3 shows the floor structure 200 of the semi-anechoic chamber of the present invention, and FIG. 4 shows a cross-sectional view along the AA' direction in FIG. 3 .

3 and 4 , the floor structure 200 includes a reflector 202 and a grounding structure 206. The reflector 202 has two metal layers 2022 and 2026 and an insulating layer 2024. The insulating layer 2024 is between the two metal layers 2022 and 2026, insulating The layer 2024 has a through hole 204. The metal layers 2022 and 2026 are connected through the through hole 204 so that the current I1 on the metal layer 2022 can flow to the metal layer 2026. The metal layers 2022 and 2026 can be, but not limited to, galvanized steel sheet. Can be but not limited to wooden boards. The grounding structure 206 is connected to the reflector 202 so that the current I1 on the reflector 202 flows to the ground GND. In this embodiment, the grounding structure 206 is realized by a support frame, which is arranged on the ground GND and is used for supporting For the reflector 202 , the support frame is connected to the metal layer 2026 of the reflector 202 . When electromagnetic waves are emitted to the reflector 202, a current I1 is generated on the metal layer 2022 of the reflector 202. The current I1 flows to the metal layer 2026 through the through hole 204, and then flows to the ground GND through the support frame (ground structure 206).

In one embodiment, the through hole 204 may be filled with conductive material, so that the metal layer 2022 is electrically connected to the metal layer 2026 .

In one embodiment, a screw can be used to fix the reflector 202 on the support frame through the through hole 204 , and the metal layer 2022 can be electrically connected to the metal layer 2026 through the screw.

In the embodiment shown in FIG. 4 , the reflector 202 has a three-layer structure, but the present invention is not limited thereto. For example, more insulating layers may be added between the metal layers 2022 and 2026 , or the reflector 202 may be modified into a single-layer structure. metal plate. In addition, the numbers and positions of the vias 204 and the ground structures 206 in FIGS. 3 and 4 can also be changed as required.

FIG. 5 shows the first embodiment of the semi-anechoic chamber 300 of the present invention, which includes a plurality of reflecting plates 202 spliced to form the floor of the semi-anechoic chamber 300. The semi-anechoic chamber 300 has an electromagnetic wave emitting area 304 for installing an electromagnetic wave transmitting device and an electromagnetic wave receiving area 306 is used for setting an electromagnetic wave receiving device. When electromagnetic waves are emitted to the reflector 202 , the reflector 202 will reflect the electromagnetic waves, and at the same time, a current I1 will be generated on the reflector 202 . Each reflector 202 is connected to a ground structure 206 (as shown in FIG. 4 ), so that the current I1 on each reflector 202 can flow to the ground GND through the ground structure 206 connected thereto, and the current I1 does not need to flow to the wall 302 first Then, it flows to the ground GND, so the semi-anechoic chamber 300 of the present invention has a better grounding effect and can improve the test of low frequency characteristics. In the semi-anechoic chamber 300 of FIG. 5 , the reflector 202 may be a multi-layer structure as shown in FIG. 4 , or may be a single-layer metal plate.

FIG. 6 shows a cross-sectional view of a part of the area shown in FIG. 5. As shown in FIG. 6, the current I1 on the reflector 202 of the present invention can not only flow to the ground GND through the through hole 204 and the ground structure 206, but also can pass through and reflect The wall 302 adjacent to the board 202 flows to the ground GND. Compared with the prior art, the present invention can provide more current paths for the current I1 on the reflector 202 to flow to the ground GND, which has a better grounding effect.

As shown in FIG. 5 , each reflector 202 can allow the current I1 to flow to the ground through the grounding structure 206 connected to it, so the anechoic chamber 300 of the present invention does not need to be like the conventional anechoic chamber 100 , the floor must be completely covered by the reflector 104 spliced, so that the current I1 can flow to the wall 102, and then flow to the ground.

FIG. 7 shows the second embodiment of the semi-anechoic chamber 300 of the present invention. In this embodiment, the floor of the semi-anechoic chamber 300 is not entirely composed of the reflector 202, and the reflector 202 is only disposed in the electromagnetic wave emitting area 304 and the electromagnetic wave receiving area 306 area in between.

FIG. 8 shows a third embodiment of the semi-anechoic chamber 300 of the present invention. In this embodiment, the reflector 202 is only disposed in the main reflecting areas 308 , 310 , 312 and 314 . The main reflection area is clearly defined in the current specification, for example, Section 5.3 of ANSI C63.4, and those skilled in the art can determine the position of the main reflection area in the semi-anechoic chamber 300 .

In the current specification, the normalized site attenuation value (Normalized Site Attenuation; NSA) of the semi-anechoic chamber must have an error within +/-4dB, while the NSA error of the traditional semi-anechoic chamber 100 is about +/-3.5dB, However, the NSA error of the semi-anechoic chamber 300 of the present invention can be reduced to +/-2.5dB, so compared with the conventional semi-anechoic chamber 100, the semi-anechoic chamber 300 of the present invention has better efficacy.

The above description of the preferred embodiments of the present invention is for illustrative purposes and is not intended to limit the present invention to the exact form disclosed. Modifications or changes are possible based on the above teachings or learning from the embodiments of the present invention. , the embodiment is to illustrate the principle of the present invention and to allow those skilled in the art to select and describe the practical application of the present invention with various embodiments, and the technical idea of the present invention is intended to be determined by the scope of the claims and their equality. .

Claims (6)

1. A floor structure of a semi-anechoic chamber, comprising:

a reflector plate, comprising:

a first metal layer;

a second metal layer; and

an insulating layer having a via hole between the first metal layer and the second metal layer; and

a grounding framework connected with the second metal layer for making the current on the second metal layer flow to the ground, wherein the grounding framework comprises a support frame arranged on the ground and connected with the second metal layer for supporting the reflecting plate;

wherein the current on the first metal layer flows to the second metal layer through the via;

wherein, the current on the second metal layer flows to the ground through the supporting frame.

2. A floor structure of a semi-anechoic chamber, comprising:

a reflecting plate for reflecting electromagnetic wave, and the reflecting plate has a through hole; and

a grounding framework electrically connected with the through hole and the ground, wherein the grounding framework comprises a support frame which is arranged on the ground and used for supporting the reflecting plate;

wherein, the current on the floor structure flows to the ground through the through hole and the support frame of the grounding framework.

3. The floor structure according to claim 2, wherein the reflection plate is a single-layer metal plate.

4. A semi-anechoic chamber, comprising:

a plurality of reflection plates for reflecting electromagnetic waves; and

a plurality of grounding structures respectively connected with the plurality of reflection plates for enabling the current on the plurality of reflection plates to flow to the ground, wherein each grounding structure comprises a support frame arranged on the ground and connected with one of the plurality of reflection plates for supporting the connected reflection plate, and the current of the reflection plate connected with the support frame flows to the ground through the support frame;

wherein the plurality of reflection plates each include:

a first metal layer for reflecting electromagnetic waves;

a second metal layer connected to one of the plurality of ground structures; and

an insulating layer having a via hole between the first metal layer and the second metal layer;

wherein the current on the first metal layer flows to the second metal layer through the via.

5. The anechoic chamber according to claim 4, further comprising:

an electromagnetic wave emitting region for installing an electromagnetic wave emitting device; and

an electromagnetic wave receiving area for setting an electromagnetic wave receiving device;

wherein, the plurality of reflecting plates are arranged between the electromagnetic wave transmitting area and the electromagnetic wave receiving area.

6. The anechoic chamber according to claim 4, wherein the plurality of reflection plates are disposed in a main reflection area of the anechoic chamber.

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