KR102561139B1 - A system for measuring shielding effectiveness and a method for measuring shielding effectiveness - Google Patents

Abstract

A shielding effect measurement system according to an embodiment of the present invention includes a shielded room; a source unit disposed inside the shielding room; connectors connecting the inside and outside of the shielding room; a signal coupler connected to the connectors; and a signal analyzer connected to the signal combiner, wherein the signal analyzer receives a signal generated in the source unit and flows out through the connector, and measures the magnitude of the signal generated in the source unit and the outflow. Analyze the ratio of the magnitude of the signal.

Description

Shielding effect measuring system and shielding effect measuring method {A SYSTEM FOR MEASURING SHIELDING EFFECTIVENESS AND A METHOD FOR MEASURING SHIELDING EFFECTIVENESS}

Embodiments relate to a system and method for measuring the shielding effectiveness of an electromagnetic shielding room.

The shielding room may be an electromagnetic wave blocking facility that blocks electromagnetic waves. For example, a shielded room may be a space requiring security, a space for protecting an electronic device from an external electromagnetic wave environment, or a space for preventing electromagnetic waves generated from a specific electronic device from leaking to the outside.

The shielding effectiveness of a shielded room may be a performance indicator representing the shielding performance of the shielded room against electromagnetic waves. Therefore, the shielding effect of the shielded room must be accurately measured.

In general, there are various methods for measuring the shielding rate of a shielded room, but this general measurement method has a disadvantage in that the influence of various connectors such as LAN ports cannot be considered. That is, although the overall shielding performance of the shielding room can be measured, there is a problem in that it is difficult to monitor the outflow or inflow of electromagnetic waves through various connectors.

The present invention is to solve the above conventional problems, and an object of the present invention is to provide a shielding effect measuring system and a shielding effect measuring method capable of monitoring the inflow and outflow of electromagnetic waves by a connector.

The present invention aims to address the aforementioned needs and/or problems.

The objects of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

A shielding effect measurement system according to an embodiment of the present invention includes a shielded room; a source unit disposed inside the shielding room; connectors connecting the inside and outside of the shielding room; a signal coupler connected to the connectors; and a signal analyzer connected to the signal combiner, wherein the signal analyzer receives a signal generated in the source unit and flows out through the connector, and measures the magnitude of the signal generated in the source unit and the outflow. Analyze the ratio of the magnitude of the signal.

The connectors may include different types of connectors.

The connectors may include an N-type connector, an SMA-type connector, and a LAN-type connector.

It may further include wires connecting the connectors and the signal combining unit and wires connecting the signal combining unit and the signal analyzing unit, and the wires may include a coaxial cable.

The signal combiner may include an impedance matching circuit.

The signal analysis unit may include a spectrum analyzer.

A shielding effect measuring method according to an embodiment of the present invention includes a source signal generating step of generating a signal by a source unit inside a shielded room; a signal combining step of generating a combined signal by combining signals flowing out of the shielded room through connectors connecting the inside and the outside of the shielded room; and a signal analysis step of measuring the shielding effect by analyzing the combined signal with a signal analyzer, wherein the signal analysis step comprises: calculating a ratio between the magnitude of the source signal and the magnitude of the outgoing signal; includes

The method may include determining whether the ratio is lower than a preset threshold.

An alarm may be generated if the ratio is lower than the threshold.

The signal coupling step may include matching impedances of the shielding room and the signal analyzer.

A shielding effect measurement system according to an embodiment of the present invention includes a signal combining unit for combining signals from a plurality of connectors, thereby having an advantage of being able to collectively measure shielding performance of a plurality of connectors.

The method for measuring shielding effectiveness according to an embodiment of the present invention has an advantage of being able to collectively measure shielding performance of a plurality of connectors by using a signal coupling unit that combines signals from a plurality of connectors.

The shielding effect measuring system and method according to an embodiment of the present invention has an advantage in that the time required for measuring the shielding effect can be reduced by allowing the shielding performance of a plurality of connectors to be collectively measured.

The effects of the shielding effect measuring system and method according to the embodiment of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a diagram showing a transmit antenna and a receive antenna for measuring shielding effectiveness.
2 is a diagram showing a transmission antenna and a reception antenna for measuring shielding effectiveness and a shielding wall disposed therebetween.
3 is a view showing a shielded room according to an embodiment of the present invention.
4 is a diagram showing a general shielding effect measurement system.
5 is a diagram illustrating a shielding effect measuring system according to an embodiment of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. The present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only the embodiments will make the disclosure of the present invention complete, and those of ordinary skill in the art to which the present invention belongs It is provided to fully inform the scope of the invention, the invention is defined only by the scope of the claims.

Since the shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, the present invention is not limited to those shown in the drawings. Like reference numbers designate substantially like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

When "comprises", "includes", "has", "consists of", etc. mentioned in this specification is used, other parts may be added unless '~ only' is used. When a component is expressed in the singular, it may be interpreted in the plural unless specifically stated otherwise.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, when a positional relationship between two components is described as 'on ~', 'on top of ~', 'on the bottom of ~', 'next to', etc., ' One or more other components may be interposed between those components where 'immediately' or 'directly' is not used.

Although first, second, etc. may be used to distinguish the components, the function or structure of these components is not limited to the ordinal number or component name attached to the front of the component.

The following embodiments may be partially or wholly combined or combined with each other, and technically various interlocking and driving operations are possible. Each of the embodiments may be implemented independently of each other or together in an association relationship.

Hereinafter, a display device according to an embodiment of the present specification will be described with reference to the accompanying drawings. Like reference numbers throughout the specification indicate substantially the same elements. In the following description, when it is determined that a detailed description of a known function or configuration related to the present specification may unnecessarily obscure the gist of the present specification, the detailed description will be omitted or briefly described.

1 and 2 are views for explaining a method of measuring the shielding effect of an electromagnetic wave shielding room. 1 is a diagram illustrating measurement of reception in the case where there is no shielding wall between two antennas. FIG. 2 is a diagram illustrating measurement of a reception rate when a shielding wall is disposed between two antennas.

Referring to FIG. 1 , signal reception rates between two antennas 20 and 30 located outside a shielded room may be measured. By measuring the signal reception rate between the two antennas 20 and 30 located outside the shielded room, a reference value of the reception rate in a general state can be obtained.

Referring to FIG. 2 , reception rates between the two antennas 20 and 30 may be measured by placing one of the two antennas 20 and 30 inside the shielded room and placing the other one outside the shielded room. That is, the shielding wall 10 may be placed between the two antennas 20 and 30 and the reception rate may be measured.

The transmission antenna 20 may be placed outside the shielded room, and the reception antenna 30 may be located inside. Electromagnetic waves can be generated by the transmitting antenna 20 outside the shielded room and incident into the shielded room. The receiving antenna 30 inside the shielded room may receive electromagnetic waves coming from the transmitting antenna 20 .

Alternatively, the receiving antenna 30 may be located outside the shielded room, and the transmitting antenna 20 may be placed inside. The transmission antenna 20 inside the shielded room can generate electromagnetic waves and send them to the outside of the shielded room. The receiving antenna 30 outside the shielded room may receive electromagnetic waves coming from the transmitting antenna 20 .

At this time, the power of the signal input to the transmission antenna 20 to generate electromagnetic waves may be kept constant. Each of the transmit and receive antennas 20 and 30 may be spaced apart from the wall of the shield room by a predetermined distance. For example, the distance between the transmitting antenna 20 and the receiving antenna 30 may be 2 to 3 m. In this case, the distance between each of the antennas 20 and 30 from the wall of the shielding room may be about 1 to 1.5 m, but is not limited thereto.

The shielding effect can be measured through the ratio of the power of the signal received at the receiving antenna 30 for each case when there is no shielding wall 10 between the antennas and when there is a shielding wall 10 between the antennas.

The shielding effect (SE) can be expressed by Equation 1.

In Equation 1, Pn is the power of a signal received by the receiving antenna when there is no shielded room, and Ps represents the power of the signal received by the receiving antenna when there is a shielded room.

Since this uses a broadband antenna used for transmission and reception, it is a form of measuring and evaluating the direction of emission of electromagnetic waves radiated into the air.

Although the shielding effect (SE) measurement method described above can measure the shielding effect of the shielded room itself, the effect of various connectors located on the wall of the shielded room, that is, the inflow of signals and the coupling of signals through the connectors can be confirmed. There is a limit that is difficult to do. A system and method for measuring the shielding performance of connectors is described below.

3 is a view showing a shielded room according to an embodiment.

Referring to FIG. 3 , a shielding room 100 according to an embodiment of the present invention may include a shielding wall 101, an entrance door 102, and connectors C1, C2, C3, and Cn. The shielding room 100 may include an electromagnetic wave shielding room for shielding electromagnetic waves, but is not limited thereto.

The shielding wall 101 may be a wall forming the shielding room 100 . For example, the shielding wall 101 may block electromagnetic waves introduced from the outside of the shielding room 100 . Alternatively, the shielding wall 101 may block electromagnetic waves leaking from the inside of the shielding room 100 to the outside. In one embodiment, the shielding wall 101 may be formed by attaching small-sized metal panels side by side. In other words, the shielding wall 101 may include a metal wall. In another embodiment, the shielding wall 101 may include a concrete composition, but is not limited thereto.

The entrance door 102 may be formed on one side of the shielding wall 101 . For example, the entrance door 102 may be a door used by a user using the shielded room 100 to enter and exit the shielded room 100 . The door 102 may include the same material as the shielding wall 101 . In one embodiment, the entrance door 102 may be formed by attaching small-sized metal panels side by side. In other words, the door 102 may include a metal wall. In other embodiments, door 102 may include, but is not limited to, a concrete composition. The shielded room 100 may include one or more doors 102 . That is, the shielded room 100 may include a plurality of doors 102, but is not limited thereto.

The connectors C1 , C2 , C3 , and Cn may be formed on one surface of the shielding wall 101 . It may be formed on the same surface as the surface on which the door 101 is formed or formed on another surface. The connectors C1, C2, C3, and Cn may be configured to supply various signals required inside the shield room 100. Alternatively, the connectors C1 , C2 , C3 , and Cn may be configured to transmit signals from inside the shielded room 100 to the outside or to send and receive signals between the inside and outside of the shielded room 100 . In one embodiment, the connectors (C1, C2, C3, Cn) may include a LAN port for using the Internet inside the shield room 100, but is not limited thereto. In order to transmit and receive various signals, the connectors C1, C2, C3, and Cn may be implemented in various types. The connectors C1, C2, C3, and Cn may include an N-type connector, an SMA-type connector, and a LAN-type connector, but are not limited thereto.

Each of the connectors C1 , C2 , C3 , and Cn may be connected to wires L1 , L2 , L3 , and Ln. The wires (L1, L2, L3, Ln) send external signals to the inside of the shield room 100 through the connectors C1, C2, C3, and Cn, or send signals inside the shield room 100 to the connectors C1, C2, C3, and Cn. It may be a wire to send to the outside through C2, C3, Cn). The wires L1, L2, L3, and Ln may include coaxial cables. A coaxial cable is a cable in which an inner conductor is wrapped with an insulator and a normal coaxial outer conductor is wrapped around it, and both conductors can be used as a reciprocating transmission path.

4 is a schematic diagram of a system for measuring the shielding effectiveness of conventional connectors.

Referring to FIG. 4 , a conventional shielding effect system may include a source unit 110' and a signal analyzer 300'. The source unit 110' may be disposed inside the shield room 100 and may generate a source signal. The signal analyzer 300' may measure a shielding effect by receiving a signal flowing into the signal analyzer 300'. The signal analyzer 300' may include a spectrum analyzer. The spectrum analyzer may convert the received time domain signal into a frequency band signal and compare the signals. The signal analyzer 300' may be individually connected to each of the connectors C1, C2, C3, and Cn.

More specifically, first, the shielding performance of the first connector C1 may be measured by connecting the signal analyzer 300' to the first connector C1. The signal analyzer 300' and the first connector C1 may be connected through a first wire L1. The signal analyzer 300' may measure the level of power of a signal generated by the source unit 110' and flowing out through the first connector C1 and the first wire L1. The shielding effect of the first connector C1 may be measured by comparing the power of the transmitted signal and the signal generated by the source unit 110'.

Then, the shielding performance of the second connector C2 may be measured by connecting the signal analyzer 300' to the second connector C2. The signal analyzer 300' and the second connector C2 may be connected through a second wire L2. The signal analyzer 300' may measure the magnitude of power of a signal generated by the source unit 110' and flowing out through the second connector C2 and the second wire L2. The shielding effect of the second connector C2 may be measured by comparing the power of the transmitted signal and the signal generated by the source unit 110'.

Shielding performance of all connectors C1, C2, C3, and Cn can be measured in the same manner as above. This method has a limitation in that it takes a lot of time because the shielding performance of all the connectors C1, C2, C3, and Cn must be repeatedly measured.

5 is a diagram illustrating a shielding effect measuring system according to an embodiment of the present invention.

Referring to FIG. 5 , the shielding effect measuring system according to an embodiment of the present invention may include a source unit 110 , a signal combiner 200 , and a signal analyzer 300 . The source unit 110 may be disposed inside the shielded room 100 and may generate a source signal. The signal analyzer 300 may measure a shielding effect by receiving a signal flowing into the signal analyzer 300 . The signal analyzer 300 may include a spectrum analyzer. The spectrum analyzer may convert the received time domain signal into a frequency band signal and compare the signals.

The signal combiner 200 may be configured to collectively combine a plurality of signals introduced from the connectors C1 , C2 , C3 , and Cn of the shield room 100 . The signal combiner 200 may easily measure shielding effectiveness by combining signals from various types of connectors C1 , C2 , C3 , and Cn. The signal combiner 200 may include an impedance matching circuit for matching impedances of circuits connected to both ends of the signal coupler 200 . The impedance matching circuit may be configured to reduce reflection due to an impedance difference between circuits connected to both ends of the signal coupling unit 200 .

The source unit 110 disposed inside the shielded room 100 may generate a test signal. Information on the signal for test, for example, the magnitude of power may be a value previously known by the user. When a test signal is generated in the source unit 110, the signal flowing out through the connectors C1, C2, C3, and Cn travels through the wires L1, L2, L3, and Ln to the signal coupling unit 200. After being combined, it may reach the signal analysis unit 300 . The wires L1, L2, L3, and Ln may include coaxial cables.

The signal analyzer 300 may measure the shielding effect (SE) by checking the power of the signal that has arrived and comparing it with the power of the initial signal generated by the source unit 110 . The shielding effect of the connectors C1, C2, C3, and Cn can be measured by Equation 2.

Pi is the initial power of a signal generated by the source unit 110. Pi is the initial power of the test signal set by the user, so it is a fixed value. P is the amount of power drained through the connectors C1, C2, C3, and Cn among the signals generated by the source unit 110. As the power received by the source unit 110 increases, the value of P may increase. Therefore, as the variable value P, that is, the power received by the source unit 110 increases, the shielding effect SE may decrease. In other words, when the shielding effect SE is small, it means that there are many electromagnetic waves (or signals) flowing out through the connectors C1, C2, C3, and Cn.

The signal analyzer 300 may store a threshold value set by a user. When the shielding effect (SE) is lower than the threshold value, the signal analyzer 300 may notify the user of this through an audible, visual, or various alarms, since electromagnetic waves exceeding the permissible range may flow in or out. The user can know that there is a problem in the shielding effect (SE) of the shielding room 100 through the alarm, and can take measures for this. In more detail, the user can know that there is a problem in the shielding performance of the connectors C1, C2, C3, and Cn of the shielding room 100 through an alarm, and can take measures.

Components constituting the above-described shielding effect measurement system, that is, the source unit 110, the signal combiner 200, and the signal analyzer 300 are connected to the shielding room 100 only when necessary to measure the shielding effect. It can be separated from the shielding room 100 when used and not measuring the shielding effect.

According to the shielding effect measuring system and measuring method according to the embodiment of the present invention, the shielding effect (SE) of the shield room 100, more specifically, the shielding effect of the connectors (C1, C2, C3, Cn) It has the advantage of being able to check in time.

The shielding effect measuring system shielding effect measuring method in the present invention described above has been described with reference to the accompanying drawings, but this is only exemplary, and those skilled in the art can make various modifications and equivalent other implementations therefrom. It will be appreciated that examples are possible.

Therefore, the scope of true technical protection of the present invention should be determined only by the technical spirit of the appended claims.

100: shield room 110: source unit
200: signal coupling unit 300: signal analysis unit
C1, C2, C3, Cn: Connectors L1, L2, L3, Ln: Wires

Claims (10)

shielded room;
a source unit disposed inside the shielding room;
a plurality of connectors connecting the inside and outside of the shielding room;
a signal combiner connected to the plurality of connectors and synthesizing a plurality of signals transmitted from the plurality of connectors to generate a combined signal; and
A signal analyzer connected to the signal combiner; includes;
The signal analysis unit,
Receiving a signal generated in the source unit and flowing out through the connector;
Shielding effect measuring system for analyzing the ratio of the magnitude of the signal generated by the source unit and the magnitude of the outgoing signal. According to claim 1,
The system for measuring shielding effectiveness, wherein the connectors include connectors of different types. According to claim 2,
The connectors include an N-type connector, an SMA-type connector, and a LAN-type connector. According to claim 1,
Further comprising wires connecting the connectors and the signal combining unit and wires connecting the signal combining unit and the signal analyzing unit,
The shielding effect measurement system wherein the wirings include coaxial cables. According to claim 1,
The signal coupling unit comprises a shielding effect measuring system comprising an impedance matching circuit. According to claim 1,
The signal analysis unit,
A shielding effectiveness measurement system that includes a spectrum analyzer. A source signal generation step of generating a signal by a source unit inside the shielded room;
a signal combining step of generating a combined signal by synthesizing a plurality of signals flowing out of the shielded room through a plurality of connectors connecting the inside and the outside of the shielded room; and
A signal analysis step of measuring the shielding effect by analyzing the combined signal with a signal analyzer;
The signal analysis step,
calculating a ratio between the magnitude of the source signal and the magnitude of the outgoing signal; Shielding effect measurement method comprising a.
According to claim 7,
A shielding effect measuring method comprising the step of determining whether the ratio is lower than a preset threshold value. According to claim 8,
A method for measuring shielding effectiveness that generates an alarm when the ratio is lower than the threshold. According to claim 7,
Wherein the signal coupling step comprises matching impedances of the shielding room and the signal analysis unit.