CN113438885A - WiFi signal shielding rail - Google Patents
WiFi signal shielding rail Download PDFInfo
- Publication number
- CN113438885A CN113438885A CN202110855422.7A CN202110855422A CN113438885A CN 113438885 A CN113438885 A CN 113438885A CN 202110855422 A CN202110855422 A CN 202110855422A CN 113438885 A CN113438885 A CN 113438885A
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- substrate
- wifi signal
- metal strips
- isolation
- isolation gate
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0001—Rooms or chambers
- H05K9/0003—Shielded walls, floors, ceilings, e.g. wallpaper, wall panel, electro-conductive plaster, concrete, cement, mortar
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0071—Active shielding
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a WiFi signal shielding fence which comprises at least one layer of fence body, wherein the fence body comprises a substrate, a first isolation gate and a second isolation gate, the first isolation gate and the second isolation gate are respectively attached to a first surface and a second surface of the substrate, and the first isolation gate and the second isolation gate respectively comprise a plurality of metal strips which are distributed in an array manner and a plurality of resistive loads which are connected between the adjacent metal strips in series; the projections of the metal strip of the first isolation gate and the metal strip of the second isolation gate in the thickness direction of the substrate are mutually vertical; the whole process utilizes the cross polarization isolation characteristic of the metal strips which are mutually perpendicular to the two sides of the substrate to absorb and weaken the WiFi signals by decomposing the WiFi signals into parallel components and vertical components so as to achieve the purpose of shielding, and the device has the advantages of simple structure, convenience in use and higher practicability.
Description
Technical Field
The invention relates to the technical field of signal shielding, in particular to a WiFi signal shielding fence.
Background
With the rapid development of communication and information technology, social communication cost is greatly reduced, social production efficiency is greatly improved, and the problem of information security is more and more prominent. In some offices where information needs to be strictly kept secret, signal shielding, particularly shielding of WiFi (wireless) signals, is required.
In the traditional WiFi signal shielding device, because a plurality of antennas and a peripheral power supply structure need to be installed in the shielding device, the defects of large body size and poor expansion capability exist; most of the shields are active devices which can normally work only by an external power supply, and have certain limitation when in use.
Disclosure of Invention
The invention aims to provide a WiFi signal shielding fence to solve the problems that an active WiFi signal shielding device in the prior art is large in size, poor in expansion capability and required to be externally connected with a power supply in use.
In order to solve the above problems, the present invention provides a WiFi signal shielding fence, including at least one layer of fence body, where the fence body includes a substrate, a first isolation gate attached to a first surface of the substrate, and a second isolation gate attached to a second surface of the substrate opposite to the first surface, and both the first isolation gate and the second isolation gate include a plurality of metal strips distributed in an array and a plurality of resistive loads connected in series between adjacent metal strips; the projections of the metal strips of the first isolation gate and the metal strips of the second isolation gate in the thickness direction of the substrate are perpendicular to each other.
By adopting the structure, when the WiFi signal is radiated to the fence body, the metal strip on the first surface of the substrate decomposes the WiFi signal into a parallel component parallel to the metal strip and a vertical component perpendicular to the metal strip, so that the parallel component acts on the metal strip and generates an induced current on the surface of the metal strip, and the induced current is absorbed by acting through the resistive load; meanwhile, the vertical component is transmitted to the second surface of the substrate along the substrate, so that the vertical component acts on the metal strip on the second surface and generates induced current on the metal strip, the induced current is absorbed by acting through the resistive load on the second surface, and the shielding of the WiFi signal is realized.
Furthermore, an isolation region for isolating each metal strip from each other is formed on the substrate.
Further, the isolation region comprises a first isolation gap formed between every two adjacent metal strips along the length direction of the metal strips and a second isolation gap formed between every two adjacent metal strips along the width direction of the metal strips.
Further, the resistive load is connected with the head end part and the tail end part of the two adjacent metal strips.
Further, the length of the metal strip is half of the wavelength of the WiFi signal.
The fence further comprises dielectric layers which are arranged between two adjacent layers of fence bodies in a stacked mode, and the upper surface and the lower surface of each dielectric layer are respectively arranged opposite to the second isolation gate on one substrate and the first isolation gate on the other adjacent substrate.
Further, the metal strip and the length direction or the width direction of the substrate are arranged at a preset angle, and the preset angle is +/-45 degrees.
Further, the resistive load is a resistor, and the resistance value of the resistor is 50-500 omega.
Further, the substrate is made of a non-metallic insulating material.
Further, the width of the second isolation gap is less than one tenth of the wavelength of the corresponding WiFi signal; one end of the resistive load is connected to the position, close to one transverse side edge, of the head end or the tail end of one metal strip, and the other end of the resistive load is connected to the position, close to the other transverse side edge, of the tail end or the head end of the other adjacent metal strip.
According to the invention, the first isolation grating and the second isolation grating are arranged, the WiFi signal is decomposed into a parallel component and a vertical component based on the cross polarization isolation characteristic of electromagnetic waves, and the parallel component and the vertical component are respectively absorbed and weakened through the metal strips and the resistive load which are arranged vertically to each other, so that the shielding of the WiFi signal is realized; and the whole shielding fence is of a passive structure, a peripheral power supply circuit does not need to be additionally arranged, and the structure of the shielding fence is simplified.
Drawings
Fig. 1 is a schematic structural diagram of a WiFi signal shielding fence according to the present invention.
Fig. 2 is a schematic structural diagram of a WiFi signal shielding fence having a multi-layer fence body structure.
Fig. 3 is a top view of fig. 1.
Fig. 4 is a bottom view of fig. 1.
Detailed Description
The WiFi signal shielding fence can shield signals of a characteristic frequency band, has a strong frequency selection characteristic, and is based on the principle of electromagnetic radiation, and induced current generated when the WiFi signals are radiated to the surface of a metal strip flows through a resistive load to enable the resistive load to do work to absorb the generated induced current, so that the energy of the WiFi signals is weakened, and the WiFi signals are shielded.
The invention will be further explained with reference to the drawings.
Fig. 1 is a schematic structural diagram of a WiFi signal shielding enclosure of the present invention. The WiFi signal shielding fence includes at least one layer of fence body 100, and in this embodiment, a WiFi signal shielding fence having a structure of one layer of fence body 100 is taken as an example for description. The fence body 100 comprises a substrate 1, a first isolation gate 2 attached to a first surface of the substrate 1, and a second isolation gate 3 attached to a second surface of the substrate 1 opposite to the first surface, wherein the first isolation gate 2 and the second isolation gate 3 are used for absorbing and attenuating WiFi signals radiated onto the substrate 1. In the present embodiment, the substrate 1 is made of a non-metallic insulating material; the first surface and the second surface are two largest opposite surfaces of the substrate respectively.
In other alternative embodiments, in order to improve the effect of absorbing and attenuating WiFi signals, a WiFi signal shielding enclosure including a multi-layer enclosure body 100 structure shown in fig. 2 may be provided; when the plurality of layers of fence bodies 100 are stacked, a dielectric layer 200 made of a non-metallic insulating material can be stacked between two adjacent layers of fence bodies 100 to isolate the first isolation gate 2 and the second isolation gate 3 on the substrate 1 of the adjacent fence bodies 100, so that mutual interference of signals between the first isolation gate 2 and the second isolation gate 3 is avoided. The upper surface of the dielectric layer 200 is arranged opposite to the second isolation fence 3 on the substrate 1 of the fence body 100 positioned on the upper side of the dielectric layer, and the lower surface of the dielectric layer 200 is arranged opposite to the first isolation fence 2 on the substrate 1 of the fence body 100 positioned on the lower side of the dielectric layer, so that when a WiFi signal is transmitted in the multi-layer fence body 100 structure, the WiFi signal is absorbed and weakened by the fence body 100 layer by layer, and the purpose of improving the signal shielding effect is achieved.
With continued reference to fig. 3 and fig. 4, each of the first isolation gate 2 and the second isolation gate 3 includes a plurality of metal strips 21, 31 distributed in an array, and a plurality of resistive loads 22, 32 connected in series between adjacent metal strips 21, 31; correspondingly, an isolation region for isolating each metal strip from each other is formed on the substrate. In this embodiment, it is defined that the length direction of the metal strips 21 and 31 is a parallel direction, the width direction of the metal strips 21 and 31 is a vertical direction, and when WiFi signals are radiated onto the first isolation gate 2 and the second isolation gate 3, the metal strips 21 and 31 decompose the corresponding WiFi signals into parallel components parallel to the metal strips 21 and 31 and vertical components perpendicular to the metal strips 21 and 31 in the parallel direction and the vertical direction; the resistive loads 22, 32 are configured to absorb a corresponding parallel component or a perpendicular component. In this embodiment, the metal strip is made of a good conductor material, and the metal strip is preferably a sheet structure having two opposite long sides and two opposite short sides, where the two long sides may be referred to as a transverse side and another transverse side, respectively. The resistive loads 22 and 32 are resistors, and the resistance range of the resistors is 50 Ω to 500 Ω, and in this embodiment, the resistance of the resistors is preferably 100 Ω. The projections of the metal strips 21, 31 of the first isolation gate 2 and the metal strips 21, 31 of the second isolation gate 3 in the thickness direction of the substrate 1 are perpendicular to each other, so that the metal strips 21, 31 on both sides of the substrate 1 exhibit cross polarization isolation characteristics, that is, the metal strips 21, 31 and the resistive loads 22, 32 on one side can absorb (or isolate) the corresponding parallel components, and the vertical component can continue to radiate forward along the substrate 1 and be absorbed (or isolated) by the metal strips 21, 31 and the resistive loads 22, 32 on the other side of the substrate 1.
The isolation region comprises a first isolation gap formed between every two adjacent metal strips along the length direction of the metal strips and a second isolation gap formed between every two adjacent metal strips along the width direction of the metal strips. Preferably, the first isolation gap 4 and the second isolation gap 5 are through each other, and the first isolation gap 4 and the second isolation gap 5 are perpendicular to each other, so as to isolate and overlap the metal strips 21 and 31 from each other, thereby shielding the WiFi signal with a specific wavelength (frequency). The resistive loads 22 and 32 are connected to the head and tail ends of the two adjacent metal strips 21 and 31, that is, in each row of metal strips arranged in a row in the length direction, the head and tail ends of each two adjacent metal strips are connected through one resistive load 22 and 32, so that a channel for flowing an induced current is formed. The width of the second isolation gap 5 is determined by the wavelength of the WiFi signal to be shielded, and the width is less than one tenth of the wavelength of the corresponding WiFi signal, in this embodiment, the width of the second isolation gap 5 is preferably 2 mm; correspondingly, one end of the resistive load is connected to the position, close to one transverse side edge, of the head end or the tail end of one metal strip, and the other end of the resistive load is connected to the position, close to the other transverse side edge, of the tail end or the head end of another adjacent metal strip; that is, when one end of the resistive load is connected to the head end of the one metal strip, the other end of the resistive load is connected to the tail end of the other metal strip, and when one end of the resistive load is connected to the tail end of the one metal strip, the other end of the resistive load is connected to the head end of the other metal strip; to ensure the absorption of energy by the resistive load, the corresponding signal component is truncated.
The metal strips 21 and 31 are arranged at preset angles with the length direction or the width direction of the substrate 1, and in this embodiment, the preset angles are preferably ± 45 ° for improving the shielding effect of the WiFi signal. In other alternative embodiments, the metal strips 21 and 31 may also be disposed parallel to the length direction or the width direction of the substrate 1, or form other angles with the length direction or the width direction of the substrate 1; however, it should be noted that, regardless of the arrangement of the metal strips 21, 31 with respect to the longitudinal direction or the width direction of the substrate 1, the projections of the metal strips 21, 31 on both sides of the substrate 1 in the thickness direction of the substrate 1 are required to be perpendicular to each other.
In order to ensure that the output of the metal strips 21 and 31 is a sine wave with a single frequency, so that the signal with the frequency can satisfy the oscillation condition, it is preferable that the length of the metal strips 21 and 31 is half of the wavelength of the WiFi signal, that is, the length of the metal strips 21 and 31 is equal to the length of half wavelength, so that the fence body 100 has the frequency selection characteristic of half wavelength. Since most WiFi signals have a wavelength of 12cm at present, in this embodiment, the length of the metal strips 21 and 31 is set to be 6cm, but it should be understood that in other alternative embodiments, the metal strips 21 and 31 may be set to have any length as needed to shield signals with a specific wavelength.
When the invention works, when a WiFi signal is radiated to the metal strips 21 and 31 of the first isolation gate 2, the metal strips 21 and 31 decompose the WiFi signal into a parallel component parallel to the metal strips 21 and 31 and a perpendicular component perpendicular to the metal strips 21 and 31, so that the parallel component acts on the metal strips 21 and 31 and an induced current parallel to the metal strips 21 and 31 is generated on the surfaces of the metal strips 21 and 31, the induced current generates magnetic resonance with a magnetic field of the incident WiFi signal, the parallel component is isolated on one side of the first isolation gate 2, and then the induced current flows through the resistive loads 22 and 32 to make the resistive loads 22 and 32 do work to absorb the induced current and weaken and absorb the energy of the parallel component; meanwhile, the vertical component continues to propagate forward to the second isolation gate 3 along the substrate 1, and since the metal strips 21, 31 of the second isolation gate 3 and the metal strips 21, 31 of the first isolation gate 2 are arranged perpendicular to each other, when the vertical component propagates to one side of the second isolation gate 3, that is, the vertical component is in parallel relation with the metal strips 21, 31 of the second isolation gate 3, the vertical component acts on the metal strips 21, 31 of the second isolation gate 3 and generates an induced current parallel to the metal strips 21, 31 on the surfaces of the metal strips 21, 31, and then the induced current flows through the resistive loads 22, 32 of the second isolation gate 3, so that the resistive loads 22, 32 do work to absorb the corresponding induced current, and the purpose of shielding and weakening a WiFi signal is achieved.
When the fence body 100 is used as a single layer, the fence body 100 only comprises one layer of substrate 1 and two layers of extremely thin metal sheets, and the fence body 100 can be bent at will to adapt to various application scenes, so that the fence body has good bending performance; when the multilayer fence body 100 is stacked for use in order to improve the shielding effect, only one dielectric layer 200 needs to be stacked between two layers of fence bodies 100, so that the expandable fence has better expansibility.
The WiFi signal is decomposed into a parallel component and a vertical component, the cross polarization isolation characteristic of the metal sheets perpendicular to each other on the two sides of the substrate 1 is utilized, the WiFi signal is absorbed and weakened, the shielding purpose is achieved, an external power circuit is not needed in the whole process, and the WiFi signal shielding device is simple in structure, convenient to use and high in practicability.
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. The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields, and are within the scope of the present invention.
Claims (10)
1. The utility model provides a wiFi signal shielding rail, includes at least one deck rail body, its characterized in that: the fence body comprises a substrate, a first isolation gate attached to a first surface of the substrate and a second isolation gate attached to a second surface, opposite to the first surface, of the substrate, wherein the first isolation gate and the second isolation gate respectively comprise a plurality of metal strips distributed in an array manner and a plurality of resistive loads connected in series between the adjacent metal strips; the projections of the metal strips of the first isolation gate and the metal strips of the second isolation gate in the thickness direction of the substrate are perpendicular to each other.
2. The WiFi signal shielding fence of claim 1, wherein: isolation regions for isolating each metal strip from each other are formed on the substrate.
3. The WiFi signal shielding fence of claim 2, wherein: the isolation region comprises a first isolation gap formed between every two adjacent metal strips along the length direction of the metal strips and a second isolation gap formed between every two adjacent metal strips along the width direction of the metal strips.
4. The WiFi signal shielding fence of claim 1, wherein: the resistive load is connected with the head end parts and the tail end parts of the two adjacent metal strips.
5. The WiFi signal shielding fence of claim 1, wherein: the length of the metal strip is half of the wavelength of the WiFi signal.
6. The WiFi signal shielding fence of claim 1, wherein: the fence structure further comprises a dielectric layer which is arranged between two adjacent layers of fence bodies in a stacked mode, and the upper surface and the lower surface of the dielectric layer are respectively arranged opposite to the second isolation gate on one substrate and the first isolation gate on the other adjacent substrate.
7. The WiFi signal shielding fence as claimed in any one of claims 1 to 6, wherein: the metal strip is preset at an angle with the length direction or the width direction of the substrate, and the preset angle is +/-45 degrees.
8. The WiFi signal shielding fence as claimed in any one of claims 1 to 6, wherein: the resistive load is a resistor, and the resistance value of the resistor is 50-500 omega.
9. The WiFi signal shielding fence as claimed in any one of claims 1 to 6, wherein: the substrate is made of a non-metallic insulating material.
10. The WiFi signal shielding fence of claim 3, wherein: the width of the second isolation gap is less than one tenth of the wavelength of the corresponding WiFi signal; one end of the resistive load is connected to the position, close to one transverse side edge, of the head end or the tail end of one metal strip, and the other end of the resistive load is connected to the position, close to the other transverse side edge, of the tail end or the head end of the other adjacent metal strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110855422.7A CN113438885A (en) | 2021-07-28 | 2021-07-28 | WiFi signal shielding rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110855422.7A CN113438885A (en) | 2021-07-28 | 2021-07-28 | WiFi signal shielding rail |
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| Publication Number | Publication Date |
|---|---|
| CN113438885A true CN113438885A (en) | 2021-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110855422.7A Pending CN113438885A (en) | 2021-07-28 | 2021-07-28 | WiFi signal shielding rail |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114814958A (en) * | 2022-07-01 | 2022-07-29 | 河北帝斯杰奥科技有限公司 | Receiving device and analysis system for earth polarization excimer radiation |
-
2021
- 2021-07-28 CN CN202110855422.7A patent/CN113438885A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114814958A (en) * | 2022-07-01 | 2022-07-29 | 河北帝斯杰奥科技有限公司 | Receiving device and analysis system for earth polarization excimer radiation |
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