WO2014134792A1

WO2014134792A1 - Isolating plate for radio frequency isolation and radio frequency isolating method therefor

Info

Publication number: WO2014134792A1
Application number: PCT/CN2013/072219
Authority: WO
Inventors: 吴晓宁
Original assignee: 北京中石伟业科技股份有限公司
Priority date: 2013-03-06
Filing date: 2013-03-06
Publication date: 2014-09-12

Abstract

Disclosed is an isolating plate (205) for radio frequency isolation, comprising an elastic layer (2051) having the capability of compressive deformation and a conducting layer (2052) attached to the surface of the elastic layer (2051). When in use, the conducting layer (2052) is in electrical contact with a flange surface (104) on the top of a radio frequency isolating wall (103); the elastic layer (2051) is in contact with a cover plate (101); and a radio frequency current on the radio frequency isolating wall (103) flows back to the radio frequency isolating wall (103) through the conducting layer (2052) to realize radio frequency isolation. The isolating plate (205) has the advantages of simple structure, easy manufacture and very low cost, can adapt to any complicated function subzone mode, and can provide near-perfect Faraday shield isolation among function subzones. In the radio frequency isolating method provided by the scheme, through the electrical contact between the conducting layer (2052) and the flange surface (104), the radio frequency current realizes a return closed loop of the function subzones through the surface of the conducting layer (2052), the radio frequency isolating effect is improved and the defect of the existing conductive gasket in use is overcome.

Description

Isolation board for radio frequency isolation and radio frequency isolation method thereof

The present invention relates to the field of radio frequency isolation, and more particularly to a spacer for a separate compartment in a housing of a radio frequency isolation electronic device and a radio frequency isolation method for the spacer. Background technique

The functional partitions in the electronics housing often require electromagnetic isolation to prevent electromagnetic wave leakage, coupling, and interference between the chambers. Especially for radio frequency electronic devices such as radio transceivers and radars, when the electromagnetic interference between the functional partitions is slight, the background noise will increase and the radio frequency sensitivity will decrease. In severe cases, the normal function of the electronic device will be affected. In order not to affect the normal function of each functional partition, the shielded RF isolation design is usually carried out between the functional partitions in the housing. The pass design is for filling the conductive gasket between the flange surface of the partitioned partition wall and the cover. The basic principle of RF isolation between functional partitions in an electronic device housing is shown in FIG. 1. After the conductive gasket 105 is filled between the flange surface 104 and the cover 101, the induced RF current of each functional partition 106 passes through the conductive gasket 105. Flowing through the cover plate 101, it is then returned to the partition wall 103 of the functional partition 106 through the conductive gasket 105, and then flows from the partition wall 103 to the bottom plate 102 to form a current circulating path to realize Faraday shielding of each partition 106.

The types of conductive gaskets currently used for zoning RF isolation are: fluid in-situ conductive rubber (FIP), molded conductive rubber (U-rail spacer), reeds, etc., where in-situ molded conductive rubber (FIP) can be adapted The complex partitioned cavity pattern of the cast aluminum housing is widely used in mobile communication base stations.

However, the RF shielding isolation method based on the principle shown in FIG. 1 has the following disadvantages: 1. In the RF current circulating path, there are multiple contact interfaces between the conductive pad and the functional partition, which cannot effectively achieve maximum RF isolation. 2. The cost of conductive rubber and conductive interlining is high, and the processing is complicated; 3. The most common fluid in-situ forming conductive rubber (FIP) In order to achieve high conductivity of RF isolation, the elasticity of the elastomer is often sacrificed. As time increases, the deformation performance decreases. Summary of the invention In view of this, the object of the present invention is to provide a spacer for RF isolation and a method for RF isolation thereof to simplify the installation process, or to improve the RF isolation effect, or to save production costs.

Based on the above object, the isolation plate for radio frequency isolation provided by the present invention comprises an elastic layer having compressive deformation capability and a conductive layer attached to the surface of the elastic layer; in use, the conductive layer and the flange surface of the top of the radio frequency isolation wall are electrically In contact, the elastic layer is in contact with the cover plate, and the RF current on the RF isolation wall is returned to the RF isolation wall through the conductive layer to achieve RF isolation.

Optionally, the material of the surface of the conductive layer is the same as the material of the surface of the radio frequency isolation wall.

Preferably, the conductive layer is selected from one of a metal foil, a conductive cloth, and a conductive coating.

Preferably, the metal foil is selected from one of a copper foil and an aluminum foil.

Optionally, the elastic layer is a foam or an elastic rubber.

Preferably, the elastic layer is a polyurethane foam or an ethylene propylene diene monomer.

Optionally, a reinforcing layer is further disposed between the elastic layer and the conductive layer.

Preferably, the reinforcing layer is a fiber cloth.

The invention also provides a radio frequency isolation method for the above-mentioned isolation plate, which is placed between the flange surface of the top of the RF isolation wall and the cover plate, so that the conductive layer is in electrical contact with the flange surface, the elastic layer and The contact of the cover plate, the RF current on the RF isolation wall is returned to the RF isolation wall through the conductive layer to achieve RF isolation and shielding.

As can be seen from the above, the isolation board for RF isolation provided by the present invention has a simple structure, is easy to manufacture, and has extremely low cost, and can be adapted to any and complicated functional partitioning manner, and can provide an ideal Faraday between functional partitions. Shield isolation. Further, the conductive layer and the RF isolation wall may be selected from the same material or plating to eliminate electrochemical corrosion. The radio frequency isolation method of the isolation plate provided by the invention passes the electrical contact between the conductive layer and the flange surface, so that the radio frequency current realizes the recirculation loop of the functional partition through the surface of the conductive layer, thereby improving the radio frequency isolation effect, and overcoming the conventional conductive pad in the past Defects in use. DRAWINGS

1 is a schematic diagram showing the basic principle of radio frequency isolation between functional partitions in an electronic device casing in the prior art;

2 is a schematic perspective view of a radio frequency isolation container in an open position according to an embodiment of the present invention; FIG. 3 is a perspective view showing a three-dimensional structure of a spacer for radio frequency isolation according to an embodiment of the present invention; a top view of each functional partition; FIG. 5 is a schematic diagram of a basic principle of radio frequency isolation between functional partitions according to an embodiment of the present invention; FIG. 6 is a schematic structural diagram of an isolation panel provided with a reinforcing layer according to an embodiment of the present invention. detailed description

In order to make the objects, the technical solutions and the advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 2 and FIG. 3, respectively, a schematic perspective view of a three-dimensional structure of a radio frequency isolation container in an open position according to an embodiment of the present invention and a spacer for radio frequency isolation according to an embodiment of the present invention are used. As an embodiment of the present invention, the isolating container includes an electrically conductive outer casing 2 having an open top end and a cover plate 101 for sealing the opening. In the present embodiment, the electrically conductive outer casing 2 is a rectangular container formed with a bottom plate 102, and a front wall 22, a rear wall 23 and two side walls 24 extending upward from the bottom plate 102.

4 is a top plan view of each functional partition in the RF isolation container according to an embodiment of the present invention. As can be seen from the figure, the inside of the electrically conductive housing 2 is provided with an arbitrary and complicated functional partition 106, so as not to affect the functional partitions 106. For normal functions, a shielded RF isolation design is required between each functional partition 106.

The isolation plate 205 for RF isolation provided by the present invention comprises an elastic layer 2051 having compression deformation capability and a conductive layer 2052 attached to the surface of the elastic layer. In use, the isolation plate 205 is placed on the flange surface of the top of the RF isolation wall 103. Between the 104 and the cover 101, the conductive layer 2052 is electrically contacted with the flange surface 104, the elastic layer 2051 is in contact with the cover plate 101, and the RF current on the RF isolation wall 103 is returned to the RF isolation wall via the conductive layer 2052. 103, to achieve RF isolation.

FIG. 5 is a schematic diagram of the basic principle of RF isolation between functional partitions in the embodiment of the present invention. After the isolation panel 205 is filled between the flange surface 104 and the cover 101, the induced RF current of each functional partition 106 passes through the RF isolation wall 103. The conductive layer 2052 flowing through the isolation plate 205 is then returned to the bottom plate 102 through the RF isolation wall 103 to form a current circulation path for Faraday shielding of each functional partition 106.

In order to allow the flange face 104 at the top of each of the RF isolation walls 103 to be in sufficient electrical contact with the conductive layer 2052, the cover plate 101 is secured to the wall of the electrically conductive outer casing 2 by the fastening members (front wall 22, and/or rear wall). 23, and/or the side wall 24), at this time, the elastic layer 2051 is kept in close contact with the cover plate 1 to ensure that the electrical connection between the conductive layer 2052 and the RF isolation wall 103 is complete, thereby forming separately in each functional partition. The ideal RF isolation cavity. The fastening mechanism is provided to provide pressure between the cover plate 101 and the elastic layer 2051, and the elastic layer 2051 is compressed and deformed so that the electrical connection of the conductive layer 2052 and the RF isolation wall 103 is complete. The locking mechanism is not uniquely implemented, and may be an ordinary mechanical lock, an electromagnetic locking mechanism, or another type of locking mechanism. It should be understood that the fastening mechanism can be symmetrically disposed on the wall of the electrically conductive outer casing 2 to provide substantially uniform pressure when sealing the radio frequency isolation container. For example, fastening mechanisms are provided on the front wall 22 and the rear wall 23, respectively, and/or fastening mechanisms are respectively provided on the two side walls 24.

Since the conductive layer 2052, the bottom plate 102, and the RF isolation wall 103 together form a radio frequency isolation cavity, the cover plate 101 is selected for a wider range of materials and is not limited to the material used for the RF isolation wall 103. The cover plate 101 can be a lightweight, non-conductive material to reduce the quality of the RF isolation container, while also saving production costs and reducing production costs by at least 10%. When the cover plate 101 is a lightweight non-conductive material, the cover plate 101 should be firmly fixed to the wall of the electrically conductive outer casing 2 by using a fastening mechanism, and the electrical connection between the conductive layer 2052 and each of the radio frequency isolation walls 103 is ensured. fully.

In order to provide RF isolation, the surface of the RF isolation wall 103 and the surface of the bottom plate 102 are both electrically conductive materials, and the material of the surface of the conductive layer 2052 is the same as the surface of the RF isolation wall 103, and the material of the surface of the substrate 102 is the same. Nearly ideal Faraday shield isolation between functional partitions eliminates electrochemical corrosion and improves RF isolation.

Optionally, the conductive layer 2052 is selected from one of a metal foil, a conductive cloth, and a conductive coating. Preferably, the metal foil is selected from one of a copper foil and an aluminum foil. Aluminum foil is preferred to reduce radio frequency interference. The aluminum conductive coating may also be selected, or the aluminum conductive cloth may be selected, so that the material of the surface of the conductive layer 2052 is the same as the material of the surface of each functional partition 106, thereby eliminating the electrochemical corrosion and improving the RF isolation effect of each functional partition 106. .

Optionally, the elastic layer 2051 is foam or elastic rubber.

Optionally, the elastic layer 2051 is a polyurethane foam or an ethylene propylene diene monomer.

Referring to FIG. 6, FIG. 6 is a schematic structural view of a spacer provided with a reinforcing layer according to an embodiment of the present invention. As still another embodiment of the present invention, a reinforcing layer 2053 is further disposed between the elastic layer 2051 and the conductive layer 2052 to prevent the conductive layer 2052 from being wrinkled, thereby ensuring sufficient electrical contact between the conductive layer 2052 and the flange surface 104. In this embodiment, the reinforcing layer 2053 may be a fiber cloth, and the elastic layer 2051 and the conductive layer 2052 are respectively attached to both sides of the reinforcing layer 2053.

As described above, the isolation board for radio frequency isolation provided by the present invention has a simple structure, is easy to manufacture, and has extremely low cost, and can be adapted to any and complicated functional partitioning manner, and can be provided between functional partitions. Close to the ideal Faraday shield isolation. Further, the conductive layer and the RF isolation wall may be selected from the same material or plating to eliminate electrochemical corrosion.

The radio frequency isolation method of the isolation plate provided by the invention passes the electrical contact between the conductive layer and the flange surface, so that the RF current flows through the surface of the conductive layer to realize the recirculation loop of the functional partition, thereby improving the RF isolation effect and overcoming the conventional conductive gasket. Defects in use.

It should be understood by those skilled in the art that the above description is only the embodiment of the present invention, and is not intended to limit the invention, and any modifications, equivalents, and improvements made within the spirit and principles of the present invention. And so on, should be included in the scope of protection of the present invention.

Claims

Claim

A spacer for radio frequency isolation, characterized in that the spacer comprises an elastic layer having a compressive deformation capability and a conductive layer attached to a surface of the elastic layer; in use, the conductive layer and the top of the radio frequency barrier The flange surface is in electrical contact, the elastic layer is in contact with the cover plate, and the RF current on the RF isolation wall is returned to the RF isolation wall through the conductive layer to realize the RF isolation.

2. The spacer for radio frequency isolation according to claim 1, wherein the material of the surface of the conductive layer is the same as the material of the surface of the radio frequency isolation wall.

3. The spacer for radio frequency isolation according to claim 2, wherein the conductive layer is one selected from the group consisting of a metal foil, a conductive cloth, and a conductive coating.

4. The spacer for radio frequency isolation according to claim 3, wherein the metal foil is one selected from the group consisting of copper foil and aluminum foil.

5. The spacer for radio frequency isolation according to claim 1, wherein the elastic layer is foam or elastic rubber.

6. The spacer for radio frequency isolation according to claim 5, wherein the elastic layer is a polyurethane foam or an ethylene propylene diene monomer.

The separator for radio frequency isolation according to any one of claims 1 to 6, characterized in that a reinforcing layer is further disposed between the elastic layer and the conductive layer.

8. The separator for radio frequency isolation according to claim 7, wherein the reinforcing layer is a fiber cloth.

The method for RF isolation of a spacer according to any one of claims 1 to 8, wherein the spacer is placed between a flange surface of a top of the RF isolation wall and a cover plate, The conductive layer is in electrical contact with the flange surface, and the elastic layer is in contact with the cover plate, and the RF current on the RF isolation wall is returned to the RF isolation wall through the conductive layer to achieve RF isolation.