JP2002026576A - Electric wave mapping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide novel business tools such as visualized 3D electric waves and EMI information, and make it possible to visually recognize EMI damage conditions at a working site or the like. SOLUTION: Interfering conditions of electric waves which can cause electric wave interference and/or EMI are expressed as digital cell mapping data to visualize the interfering conditions of electric waves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave absorber used in the fields of radio interference prevention, indoor LAN correspondence, radar false image prevention, and EMC countermeasures, particularly, millimeter waves such as indoor LAN and radio interference caused by building interference. The present invention relates to radio wave mapping, which is visualized radio wave information used as a tool during business related to high frequency radio wave absorbers. For example, in the business of solving the problem of electromagnetic interference by collectively managing the measurement of radio waves, contracting orders, printing, information processing, construction and delivery to consumers, contracting activities directly with consumers. It is related to radio wave mapping sometimes used as a tool.

[0002]

2. Description of the Related Art Conventionally, various electromagnetic wave shielding materials have been used as countermeasures against noise in electronic equipment products that emit electromagnetic waves. In the case of the electromagnetic wave shield, basically, the electromagnetic wave is prevented from entering the electronic device housing by utilizing the reflection function of the incident unnecessary electromagnetic wave. Therefore, in this case, the electromagnetic wave exists in the use space in some sense, and causes a secondary noise.

On the other hand, in the case of a conventional electromagnetic wave absorber, from the design stage, the reflection level from a radio wave absorber layer having the same geometrical area as the reflection level from a metal plate which is a perfect reflector is determined. It is manufactured in consideration of the degree of reduction, that is, how much the incident electromagnetic wave is absorbed. Therefore, in this case, there is no electromagnetic wave incident on the use space. Therefore, this is a fundamental solution to unnecessary electromagnetic waves, and both are clearly distinguished in their operation and configuration.

[0004] Further, in the past, consumers demanding improvement with respect to electromagnetic interference are generally not aware unless some sort of interference appears, because the invisible information of electromagnetic waves is the root cause. In that case, no business opportunity for electromagnetic wave countermeasures will be realized. In other words, in the past, there has not been visualization of electromagnetic waves so that awareness is expressed,
Therefore, inconvenience is felt after appearing as a phenomenon, and it is necessary to take action for the first time. More specifically, it is common to take a self-response after a TV becomes difficult to see or cannot be seen due to a radio wave obstruction such as a ghost to a monitor such as a TV. In other words, such measures are simple, such as purchasing and replacing an antenna at a retail store such as a supermarket.

On the other hand, in an indoor LAN that has been developing in recent years, for example, a plurality of computers are provided in a home, and opportunities for exchanging each room by wireless communication are increasing. In this case, since radio in a high-frequency range that is technically high is targeted, the response that can be taken by an individual must be limited to a simple one, such as trying a solution using a specialized book or the like.

[0006] Furthermore, there has been a small number of computers compatible with wireless LAN and no wireless interference has been received.
As the number of children increases or the number of connected devices increases or the room distance and installation location are changed without fail, consumers may experience sudden radio interference, loss of communication, or errors in communication data. Unawares of the situation and has to deal with it. Furthermore, the contract is conventionally performed only between the consumer and the trader A, the processing is separately performed by the processor S, and the construction is separately performed by the house maker H, etc., and the electromagnetic wave absorber is attached to solve the consumer's problem and satisfy the customer. The business flow of getting a degree was complicated.

[0007] The design and processing of the electromagnetic wave absorber after measurement also poses a problem. The first companies to deal directly with consumers (including consultation complaints) are, for example, traditionally those of public institutions, publicly licensed companies (Ministry of Posts and Telecommunications), and shield measurement specialists. In that case, a direct contact is received from the consumer side, and after receiving the contact, a simple hearing (telephone, fax, etc.) is performed. After detailed examination, bring in a measuring device,
It is customary for the contractor to proceed with the installation → measurement → result examination almost using his own know-how. Therefore, consumer opinion is almost ignored. In other words, the explanation of the data is insufficient, the data is not visualized as a drawing, and it is too professional to understand, so it will be proceeding with the advantage of the trader itself. Coupled with the inability to do so, customer satisfaction is low.

In general, the value of the S-parameter for defining the performance of the electromagnetic wave absorber is important, and the measurement methods for obtaining the S-parameter are “coaxial, waveguide method”, “cavity resonator method”,
"The free space method, etc. is selected according to the size and shape of the place or the measurement site, and the measurement is performed. In addition, the amount of radio wave absorption of the material itself is determined by the" free space standing wave method "or simply the" Advantest method. And so on.

A special measuring device or the like is used in accordance with the frequency of the electromagnetic wave. For example, a cavity resonator or a network analyzer is required for measuring a transmission coefficient using a cavity resonator. In addition, EMC (Electro Mag
As a measurement facility, a spectroanalyzer with a built-in electric field strength receiver, static electricity, burst wave, lightning surge wave, radio frequency analysis, pulse magnetic field, voltage dip drop, instantaneous power failure / voltage fluctuation, DC voltage fluctuation Some of the 7 tests have been all-in-one on one device (EIA 3U height).

[0010] Regulations (including regulations) on EMC are becoming particularly strict. Assurance of measurement is usually a proof of compliance with the EMC Directive, and CE (Communant
It is also obligatory to display an (Eeuropeenne) mark. In addition, it is customary that only the trader decides whether to use a radio wave absorber or an electromagnetic wave shield. Furthermore, there is also a type of radio wave absorber to be used as an example. In other words, since the standards such as types and frequencies are various and a high degree of specialized knowledge is required, it is generally difficult for consumers to cope with each other.

The most basic electromagnetic wave absorber is a single-layer type electromagnetic wave absorber lined with a structurally simple metal. Generally, there are many one-layer rubber sheet radio wave absorbers in which carbon particles are mixed in a rubber material. Further, there is a two-layer type radio wave absorber having a surface layer and an absorption layer. It is made of graphite-containing styrofoam or silicon carbide FR
There are many radio wave absorbers using P.

Further, there is a multilayer type radio wave absorber which requires a wide band, such as a radio wave absorber used in an anechoic chamber. This is classified into a pyramid type and a wedge type according to the structural form. As a thin film multilayer electromagnetic wave absorber, there is, for example, "Flextel" (trade name) of Nippon Enesis Co., Ltd. In this method, a combination of more than 15 kinds of materials is determined from the construction conditions and manufactured. Furthermore, each layer is firmly bonded with a special thermoplastic adhesive, and it is impossible to correct it after construction or correct it on the spot. In addition, it is inevitable to be in a form corresponding to the frequency, and it is necessary to separately prepare constituent materials. Also,
In recent years, the demand for radio waves conscious of the millimeter wave band, mainly for mobile phones, has been rapidly increasing, and accompanying this, the demand for the millimeter wave band (particularly 60G
(Hz, 90 GHz band), research and development of radio wave absorbers are also being actively conducted, and in many cases, difficult control is required in terms of processing accuracy. Receive orders and advance processing. On the other hand, in the case of construction, a contractor who can construct the above-described radio wave absorber on a building structure on the consumer side, generally a house maker H, is generally used. In such a case, the flow is that each contractor, who performs construction and delivery according to the instructions of the measurement contractor and performs final inspection, is separately and complicatedly involved.

[0013]

The problem to be solved by the present invention is a 3D radio wave visualized by a computer,
To provide a new business tool called electromagnetic interference information. To be able to visually recognize the status of obstacles caused by electromagnetic waves at construction sites as images. Wireless interference prevention, indoor LAN correspondence, radar false image prevention, and E
Radio wave absorbers used in the field of MC countermeasures, especially indoor LA
N: To realize visualized radio wave information that can be an extremely effective tool in business related to high-frequency radio wave absorbers including millimeter waves such as radio interference caused by building interference.

[0014]

Means for Solving the Problems To solve the above problems, radio wave mapping according to the present invention comprises the following steps: (1) Converting the interference state of radio waves and / or radio waves causing electromagnetic interference into digital cell mapping data; Radio wave mapping characterized by visualization. (2) The radio wave mapping according to (1), wherein the mapping area is a specified area or space. (3) The mapping area is in a tunnel, in an underground shopping mall, in an underground mall, in an underpass, in a subway, between cities, between structures, or between rooms in a house building (1) or Radio wave mapping according to (2). It is what it was.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of radio wave mapping according to the present invention will be described with reference to the drawings. FIG.
It is a schematic diagram which shows one form (Example) of the radio wave mapping 10 of this invention. Such a radio wave mapping was produced by the following steps. (A), (b), (c) of FIG.
3 is a perspective view showing digital cells 3 of various sizes.

The radio wave mapping 10 of the present invention uses radio waves and
And / or visualization of the interference state of radio waves causing electromagnetic interference as digital cell mapping data 9. Therefore, it starts by converting radio waves into visualization information. Therefore, first, in preparing the digital cell mapping data 9, for example, the entire layout of a house building,
Data such as room allocation, framework / electrical wiring, wireless repeaters and connectors are also input as symbols and numerical values, and CAD data digitally processed in a 3D state is used. For these, CAD software conventionally used in construction, design and the like may be used as it is, or may be specially produced.

Next, the 3D-CAD data is divided by a cell 1 corresponding to a unit volume of a certain cube. This cell division may be performed in an equivalent manner, or may be performed by weighting data by digital processing or the like. Further, the digital cell 3 may be a cone, a sphere, a polygon or the like instead of the cubic cell 1.

FIGS. 2A, 2B and 2C are perspective views showing digital cells 3 of various sizes. As a method of processing digital cell data (digital cell mapping data), when importance is placed on the speed of analysis processing over measurement accuracy, the number of digital cells 3 is limited or the size of cell unit 2 is changed. And set it. The arrangement of the digital cells 3 can be freely arranged as three-dimensional, and data processing such as rotation, illumination direction, etc. may be performed so as to facilitate explanation to consumers. The area of the digital cell 3 can also be set freely according to the measurement location and the number of measurement points. Furthermore, the cell unit 2 can be differentiated and set to the minimum bit of the digital data. The number of cells is not limited, and data processing may be performed as random number generation. Also, data may be encoded or thinned out to perform intermediate processing to increase speed and convenience.

Next, digital processing software for analyzing electromagnetic interference is used separately. This is for visualizing the interference state, and is preferably one capable of performing detailed simulation analysis of the flow and behavior of the electromagnetic wave in 3D as much as possible. Commercially available electromagnetic field analysis software may be used, and further, basic software (Mathematica, d-BASE, visual-BASIC) may be combined,
It may be dedicated by self-production or the like. For example, if it is a commercially available electromagnetic field analysis software, there are a lot of software for microwave CAD in particular.
c. , A linear simulator, Supercompac
t, Tochstone, SN
AP, Libra, MDS, MSPICE and the like are used.

Further, the OS is not particularly limited, and any OS may be used. For example, the OS is Win
dows (registered trademark), MacOS (registered trademark), UN
IX (registered trademark), Linux, or the like may be used. These simulators are associated with computing power.
For example, in the basic SPICE, RAM is 640K-
100M, CPU is in the range of about 8086-68030, and HFSS is compatible with 3D, RAM is 60M-1G, CPU is PA-RISCP.
Class (II) class is basically required.
In any case, it is preferable to use a workstation-class computer after preparing a use environment, and it is preferable to provide a large-scale supercomputer-class computer and a plurality of dedicated servers.

In the configuration of the simulator, the load on the computer is reduced by simplifying the input section. In this case, Use
r Interface and a Frame section that regulates the exchange of data with other CAD, and a circuit parameter calculation, various analysis programs, and a program for optimization.
In the ngine part, and in a device such as a circuit element having a discontinuity such as a cross or a bend, or a Datab based on measured data.
Basically, it is composed of a Library section or the like that stores “ase” or the like.

Further, it is more preferable to use dedicated software capable of performing digital processing at a higher level, such as combining a plurality of such software rather than using a single software. The visualized radio wave mapping (electromagnetic wave digital mapping) 10 is obtained by combining these separately prepared softwares into digital cell mapping data and visualizing them.

The radio wave mapping (electromagnetic wave digital mapping) is analyzed as follows. The measurements are spatially multipoint measurements. Alternatively, the number may be reduced to a number that can be analyzed by performing data processing such as data complementation. Data such as the magnitude of electromagnetic wave absorption, the magnitude of electromagnetic interference, and the distance between the radio wave source and the measurement point are used as the measurement values. In the electromagnetic wave digital mapping, the position of the computer or the position of the wireless repeater, etc., which has been claimed by the consumer S, are further placed, and the necessary numerical values are input so that electromagnetic wave analysis can be performed.

Necessary numerical values may be measured on site, and in the case of a house, since the dimensional standard is unified, it is measured or simulated in a model house according to the standard or used based on data prepared in advance. The calculated value may be substituted. Further, when advanced and strict processing is required, for example, the measurement data may be obtained through a measurement company designated by D together with the business of the printing company D (which may include technology). The measurement may be performed by a specialized measurement company designated by D, or if it is determined that past data can be used, it is used.

The measurement results further show the 3D-CA of the target house.
A special symbol that superimposes on the data of D to distinguish the direction of radio waves → and distinguish, the magnitude of electromagnetic wave absorption, the magnitude of symbols with numerical values and signs, the magnitude of radio wave interference is described by wave symbols and waveforms, etc. And process the data. These are not limited as long as they can be distinguished as data. Since these are both digital data, they can be easily processed by computer.

The visualization is performed by forming a contour line, color classification (illustrated in FIG. 1), a histogram, a graph such as a wave and a polygonal line, and the like according to the result of the digital numerical value subjected to the calculation processing. This result can be displayed or presented as a display display, output on a simple printer, or printed using a digital on-demand printer.

[0027]

EXAMPLES The present invention will be further described below with reference to examples.

(Embodiment 1) FIG. 1 is a schematic diagram showing an embodiment of radio wave mapping of the present invention. Such a radio wave mapping 10 was produced by the following steps.

(1) The floor plan of a house to be subjected to radio wave measurement is converted from a floor plan (plan view) into a three-dimensional view by 3D-CAD (for building and design). (3D drawing 4 of the house). (2) Next, a digital cell 3 having a size corresponding to the space to be measured was prepared. Here, a cube having a reference amount of 1 in the same direction is classified as a unit cell 1. (3) The digital cell 3 was arranged in accordance with the measurement space. The coordinate position of each digital cell was represented and determined in an (X, Y, Z) coordinate system. However, when necessary for electromagnetic wave analysis, it was converted to a polar coordinate system and used.

(4) Specific radio wave measurement values are as follows. For the radio wave absorber material, the S-parameter, load impedance, and voltage standing wave ratio (VSWR) are measured by the resonator method and the coaxial waveguide method, respectively. I asked. Furthermore, the state of the electromagnetic interference in the room is based on a spatial standing wave method based on EMC measurement,
The reflection coefficient and the amount of absorption were measured and determined by the reflected power method. (5) Next, electromagnetic wave analysis was performed based on the measurement results. The reflection coefficient and the amount of radio wave absorption calculated and processed from the standing wave that changed in a complicated manner were arranged as digital numerical values in portions corresponding to the respective spatial positions of the digital cell 3.

The computer used for these was SUN
Workstation. Performance / Window
s NT version compatible, OS UNIX, 800MB memory,
Hard disk 40GB. Since the software used differs in the basic processing method of electromagnetic wave analysis, the following combination was analyzed. MAGNA / TDM (CRC Research Laboratory)
Electromagnetic wave analysis by finite integral equation
NA / FIM (manufactured by CRC Research Institute) and MSPICICE were used for wave analysis for the fundamental propagation part.

(6) Further, the digital cell mapping data 9 and the 3D drawing 4 of the house were superimposed and calculated to obtain the radio wave mapping 10. Here, as a result after the radio wave analysis, in the visualization of the radio wave mapping drawing, the 3D drawing 4 of the house was represented by a gradation pattern by color-coding the interference state of the radio wave according to the result of the calculated digital numerical value. A bright (white) portion in the gradation pattern indicates a place where radio interference is strong. A dark (black) part in the gradation pattern indicates a place where radio interference is weak. This is shown in FIG.

[0033]

As described above, according to the present invention, it is possible to provide a new business tool of 3D radio wave and electromagnetic interference information visualized by a computer. The use of radio wave mapping has made it possible to visually recognize the status of obstacles caused by electromagnetic waves in construction sites and the like as images. By using radio wave mapping (electromagnetic wave digital mapping), the phenomena can be understood as 3D images (moving images are also possible), and at the time of construction work together with visualization information, it is possible to meet according to the progress,
Consumer opinions are more likely to be included.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of one embodiment of radio wave mapping of the present invention.

FIG. 2 is a perspective view showing a configuration example of a digital cell of the present invention.

[Explanation of symbols]

 1 cell 2 cell unit 3 digital cell 4 3D drawing of house 9 digital cell mapping data 10 radio wave mapping

Claims (3)

[Claims] A radio wave mapping characterized in that the interference state of radio waves and / or radio waves causing electromagnetic interference is visualized as digital cell mapping data. 2. The radio wave mapping according to claim 1, wherein the mapping area is a specified area or space. 3. The mapping area is in a tunnel, in an underground shopping mall, in an underground mall, in an underpass, in a subway, between cities, between structures, and between rooms in a house building. Radio wave mapping according to 1 or 2.