CN209911421U

CN209911421U - Novel structure for improving performance of anechoic chamber

Info

Publication number: CN209911421U
Application number: CN201920618021.8U
Authority: CN
Inventors: 王军耀
Original assignee: Wuxi Jingren Electronic Materials Technology Co Ltd
Current assignee: Wuxi Jingren Electronic Materials Technology Co Ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-01-07
Anticipated expiration: 2029-04-30

Abstract

The utility model discloses a novel structure of anechoic chamber for improving anechoic chamber performance, which comprises a wave-transparent layer, a shielding layer and a wave-absorbing pyramid base; a side of penetrating ripples layer is connected with the shielding layer, and the opposite side of penetrating ripples layer sets up and inhales ripples pyramid base, inhale equidistant wedge wave absorber that is the pyramid shape that is equipped with on the ripples pyramid base, inhale ripples pyramid base with pass through and be provided with ferrite layer between the ripples layer, inhale ripples pyramid base and do not contact with penetrating ripples layer, be provided with the clearance between ferrite layer and the shielding layer, the distance in clearance is 8-18mm, the distance in clearance uses penetrating ripples layer as the interlayer. The structure can help to improve the vertical incidence maximum reflectivity of the wave-absorbing material, and has special benefit especially for the low-frequency stage of 30MHz to 1GHz, the most key performance index of the anechoic chamber is the NSA error, the vertical incidence maximum reflectivity of the wave-absorbing material is improved, the NSA error is reduced, and the performance of the anechoic chamber is improved by 30%.

Description

Novel structure for improving performance of anechoic chamber

Technical Field

The utility model relates to an anechoic chamber improvement technical field specifically is an anechoic chamber improves novel structure of anechoic chamber performance.

Background

The anechoic chamber is a closed shielding chamber which is mainly used for simulating open fields and is simultaneously used for radiated radio disturbance (EMI) and radiation sensitivity (EMS) measurement. The size of the anechoic chamber and the selection of the radio frequency wave-absorbing material are mainly determined by the dimension of the external line of a tested device (EUT) and the test requirements, and are divided into a 1m method, a 3m method or a 10m method; the anechoic chamber mainly comprises a shielding chamber and a wave-absorbing material. The shielding chamber is composed of a shielding shell, a shielding door, a ventilation waveguide window, various power filters and the like. According to the requirement of a user, the shielding shell can adopt a welding type or assembling type structure. The wave-absorbing material consists of a single-layer ferrite sheet with the working frequency range of 30 MHz-1000 MHz and a conical carbon-containing wave-absorbing material, wherein the conical carbon-containing wave-absorbing material is formed by polyurethane foam plastic or expanded polystyrene and expanded polypropylene which are permeated in a carbon adhesive solution, and has better flame-retardant property.

At present, wave absorbing materials in a 1m method, a 3m method, a 5 m method, a 10m method anechoic chamber or a microwave anechoic chamber in the market are all structures of directly laying ferrite tiles on a shielding layer in an anechoic chamber shell and then laying wave absorbing foam, the ferrite tiles are directly contacted with the shielding layer, the structures have been used for decades, the anechoic chamber built by the structures is slightly poor at low frequency of 30MHZ-1GHZ, and the maximum vertical incidence reflection loss of the low frequency is small.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Not enough to prior art, the utility model provides a anechoic chamber improves novel structure of anechoic chamber performance has solved the great problem of current anechoic chamber NSA error.

(II) technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: a novel structure of an anechoic chamber for improving anechoic chamber performance comprises a wave-transparent layer, a shielding layer and a wave-absorbing pyramid base; the wave-permeable pyramid base is characterized in that one side face of the wave-permeable layer is connected with the shielding layer, the other side of the wave-permeable layer is provided with the wave-permeable pyramid base, equidistant wedge wave-absorbing bodies which are pyramid-shaped are arranged on the wave-permeable pyramid base, the wave-permeable pyramid base is provided with a ferrite layer between the wave-permeable layers, the wave-permeable pyramid base is not in contact with the wave-permeable layers, gaps are formed between the ferrite layer and the shielding layer, the distance between the gaps is 8-18mm, and the distance between the gaps is formed by taking the wave-permeable layers as interlayers.

As a further preferable technical scheme of the utility model, the side surface of the wave-transparent layer is bonded with the shielding layer through glue; or, the screws penetrate through the wave-transparent layer and the shielding layer, the screws are fixed with the wood plate behind the shielding layer, and the wood plate is fixed on the main shielding shell.

As a further preferable technical scheme of the utility model, the thickness of wave-transparent layer is 8-18 mm.

(III) advantageous effects

The utility model provides a anechoic chamber improves novel structure of anechoic chamber performance possesses following beneficial effect: this structure is including passing through the ripples layer, shielding layer and inhale ripples pyramid base, it sets up the ferrite layer to inhale between ripples pyramid base and the wave layer, the ferrite layer sets up and is keeping away from at ripples pyramid base and inhale a side and pass through the ripples layer and ferrite layer between the integral type structure, this kind of structure can help improving absorbing material (inhale ripples pyramid + ferrite tile) normal incidence maximum reflectivity, there is special benefit to 30MHz to 1GHz low frequency stage very much, the most crucial performance index of anechoic chamber is NSA (normalized place decay) error, the normal incidence maximum reflectivity of absorbing material has been improved, NSA's error can reduce, the performance of anechoic chamber improves 30%. For example, the maximum vertical incidence reflectivity of the darkroom without the wave-transmitting material is greater than-18 dB from 30MHz to 100MHz, the maximum vertical incidence reflectivity of 100MHz to 1GHz is greater than-20 dB, the maximum vertical incidence reflectivity of 30MHz to 100MHz is less than-18 dB after the wave-transmitting layer is arranged, the maximum vertical incidence reflectivity of 100MHz to 1GHz is less than-20 dB, and the maximum vertical incidence reflectivity of the darkroom without the wave-transmitting layer is superior to that of the darkroom without the wave-transmitting layer in the frequency range of 30MHz to 40GHz through a transmission test.

Drawings

FIG. 1 is an exploded view of the present invention;

fig. 2 is a side view of the present invention;

in the figure, the wave-transparent layer 1, the shielding layer 2, the wave-absorbing pyramid base 3, the ferrite layer 4 and the wedge wave absorber 31 are arranged.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, a novel structure of an anechoic chamber for improving the performance of the anechoic chamber comprises a wave-transparent layer 1, a shielding layer 2 and a wave-absorbing pyramid base 3; a side of wave-transparent layer 1 with shielding layer 2 is connected, the opposite side of wave-transparent layer 1 sets up inhale ripples pyramid base 3, inhale equidistant wedge wave-absorbing body 31 that is the pyramid shape that is equipped with of ripples pyramid base 3, inhale ripples pyramid base 3 with be provided with ferrite layer 4 between the wave-transparent layer 1, inhale ripples pyramid base 3 not with wave-transparent layer 1 contacts, ferrite layer 4 with be provided with the clearance between the shielding layer 2, the distance in clearance is 8-18mm, the distance in clearance is with wave-transparent layer as the interlayer.

Further, the side surface of the wave-transparent layer 1 is bonded with the shielding layer 2 through glue; or, the screws penetrate through the wave-transparent layer 1 and the shielding layer 2, the screws are fixed with the wood plate behind the shielding layer 2, and the wood plate is fixed on the main shielding shell.

Further, the thickness of the wave-transparent layer 1 is 8-18 mm.

The novel structure for improving the performance of the anechoic chamber disclosed in the application document comprises the following installation modes: a wave-transparent layer 1 with the thickness of about 8-18mm is laid on a shielding layer 2 arranged in the darkroom, and a ferrite layer 4W and a wave-absorbing pyramid base 3 are laid on the wave-transparent layer 1, so that the installation of the structure for improving the performance of the darkroom in the anechoic chamber can be completed.

The novel structure for improving the performance of the anechoic chamber comprises a wave-transmitting layer, a shielding layer and a wave-absorbing pyramid base, wherein the back surface of the wave-transmitting layer is bonded with the front surface of the shielding layer through glue or is fixed on a wood board behind the shielding layer through the wave-transmitting layer by a screw, the wood board is a double-layer shielding shell fixed on a main shielding shell, and one end surface of wave-absorbing foam, which is far away from wave absorption, is in contact with the wave-transmitting layer; still include the ferrite layer, the ferrite layer sets up and keeps away from at ripples pyramid base and between the terminal surface of inhaling the ripples and the wave-permeable layer, and ferrite layer sets up and keeps away from at ripples pyramid base 3 and inhale an terminal surface of ripples and wave-permeable layer and ferrite layer between integral type structure, this kind of structure can help improving absorbing material (inhale ripples pyramid + ferrite tile) normal incidence maximum reflectivity, it has special benefit to 30MHz to 1GHz low frequency stage very much, the most crucial performance index of anechoic chamber is NSA (normalized field decay) error, the normal incidence maximum reflectivity of absorbing material has been improved, NSA's error can reduce, the performance of anechoic chamber improves 30%.

For example, the maximum vertical incidence reflectivity of the darkroom without the wave-transmitting material is greater than-18 dB from 30MHz to 100MHz, the maximum vertical incidence reflectivity of 100MHz to 1GHz is greater than-20 dB, the maximum vertical incidence reflectivity of 30MHz to 100MHz is less than-18 dB after the wave-transmitting layer is arranged, the maximum vertical incidence reflectivity of 100MHz to 1GHz is less than-20 dB, and the maximum vertical incidence reflectivity of the darkroom without the wave-transmitting layer is superior to that of the darkroom without the wave-transmitting layer in the frequency range of 30MHz to 40GHz through a transmission test.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A novel structure of anechoic chamber for improving anechoic chamber performance is characterized in that: comprises a wave-transparent layer (1), a shielding layer (2) and a wave-absorbing pyramid base (3); a side of wave-transparent layer (1) with shielding layer (2) are connected, the opposite side setting of wave-transparent layer (1) inhale wave pyramid base (3), inhale equidistant wedge wave-absorbing body (31) that are the pyramid shape that are equipped with in wave pyramid base (3), inhale wave pyramid base (3) with be provided with ferrite layer (4) between wave-transparent layer (1), inhale wave pyramid base (3) not with wave-transparent layer (1) contacts, ferrite layer (4) with be provided with the clearance between shielding layer (2), the distance in clearance is 8-18mm, the distance in clearance is with wave-transparent layer as the interlayer.

2. The new structure of anechoic chamber for improving anechoic chamber performance as claimed in claim 1, wherein: the side surface of the wave-transparent layer (1) is bonded with the shielding layer (2) through glue; or, the screws penetrate through the wave-transparent layer (1) and the shielding layer (2), the screws are fixed with the wood plate behind the shielding layer (2), and the wood plate is fixed on the main shielding shell.

3. The new structure of anechoic chamber for improving anechoic chamber performance as claimed in claim 1, wherein: the thickness of the wave-transparent layer (1) is 8-18 mm.