JPH11231003A - Electromagnetic environment evaluation method and system device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure and evaluate a variety of radio wave communication characteristics relative to various indoor environment. SOLUTION: For this device α, an ideal indoor space structure 1 is provided, which is constituted by combining together a building material applied at constituting an actual indoor space, and materially equivalent exchangeable wall material 11, exchangeable ceiling material 12, and exchangeable floor material 13, and by setting a radio wave absorbing body 14 intercepting electromagnetic continuity with the outer field on the whole territory of the outer circumferential surface. Then between the optional two points of the ideal indoor space structure 1, transmission and receiving of the radio wave are carried out to measure various radio wave characteristics, and based on the measured result at this time, the electromagnetic environment of the ideal indoor space structure 1 decided by combination of materials of the exchangeable wall material 11, the exchangeable ceiling material 12, and the exchangeable floor material 13 is evaluated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and system for evaluating an electromagnetic environment, and more particularly, to a method for simulating an ideal indoor electromagnetic environment and strictly evaluating various radio wave communication characteristics, thereby realizing an indoor environment. Indoor environment configuration method for optimizing the electromagnetic environment in the space, electromagnetic environment evaluation method for knowing the ideal wireless device arrangement method when building a wireless system in the actual indoor space, and directly used in its implementation The present invention relates to an electromagnetic environment evaluation system device.

[0002]

2. Description of the Related Art In recent years, with the spread of the Internet, multimedia communication has begun to attract attention, and the demand for communication using a computer has been increasing. Accordingly, various forms of wireless systems are frequently used in offices because there is no complicated wiring and the network configuration can be freely changed. In particular, a system such as a wireless LAN connects base stations that control the minimum network unit to each other,
Since it is possible to construct a complex network in a chain, it can be said that it has an excellent form in terms of expandability.

[0003] However, when attempting to construct a complex network in the above-described wireless system, there is no guideline such as an optimal arrangement method of base stations for each network unit. First of all, many base stations are easily located at relatively appropriate places within a range that meets the budget for introduction. For this reason, the radio communication characteristics such as the radio wave propagation characteristics and the radio system communication characteristics in the radio wave environment of the installation indoor space are grasped in advance, and as a result, the necessary minimum number of base stations are arranged in the optimal location to implement the radio system Although efficient use is desired, at present, the above-described radio wave propagation characteristics and wireless system communication characteristics have not been clarified.

[0004] As another problem, the frequency of an internal clock tends to increase with the progress of digitalization of electronic devices today, and electromagnetic interference waves radiated from the various electronic devices are generated by mobile phones. And PHS, and even the wireless LAN frequency band, causing various electromagnetic interferences such as malfunctions of other electronic devices and interference with wireless systems. For this reason, it is necessary to understand the distribution characteristics of electromagnetic interference waves in the electromagnetic environment of the indoor space and install electronic devices in a place where electromagnetic interference does not occur, but at present it is difficult because the indoor electromagnetic environment is not clear It is.

Further, in recent years, TEMPEST has begun to attract attention, and there has been a concern about information leakage due to electromagnetic waves, and electromagnetic shielding buildings and the like have been sold by major construction companies. However, although leakage of information can be prevented to some extent by electromagnetically shielding the office, it may increase unnecessary reflected waves and significantly reduce the communication characteristics of the wireless device. For this reason, it is necessary to control the indoor electromagnetic environment according to the purpose. However, as described above, it is difficult to control various electromagnetic wave communication characteristics for various indoor radio wave environments at present.

[0006]

In order to solve the above-mentioned problems, it is preferable to use an actual office or the like in order to investigate various radio wave communication characteristics with respect to various indoor environments. Of course, in an actual office, various electromagnetic interference waves and radio waves exist, so it is extremely difficult to rigorously investigate radio communication characteristics.

Further, radiating radio waves for investigating various radio wave communication characteristics in an indoor space is a violation of the Radio Law if the radiated radio waves exceed a certain reference value. There is a possibility of causing electromagnetic interference of the device, which is not preferable.

In recent years, a method of simulating various electromagnetic environments by using an electromagnetic field analysis method has been studied. However, in an actual office, the building structure is complicated and various reflecting objects exist. In addition, it is difficult to perform a detailed simulation, and in addition, since various electromagnetic interference waves and radio waves exist as described above, it is difficult to verify and improve the accuracy of the electromagnetic field simulation result.

The main objects to be solved by the present invention are as follows.

That is, a first object of the present invention is to provide an electromagnetic environment evaluation method and a system device for obtaining an ideal indoor electromagnetic environment.

A second object of the present invention is to provide an electromagnetic environment evaluation method and a system device capable of measuring and evaluating various radio communication characteristics with respect to various indoor radio environments.

A third object of the present invention is to provide an electromagnetic environment evaluation method and a system device capable of verifying an electromagnetic field simulation result.

[0013] Other objects of the present invention will become apparent from the description of the specification, the drawings, and particularly from the claims.

[0014]

According to the method of the present invention,
In order to solve the above-mentioned problems, a material equivalent to the building material applied when constructing a real indoor space such as an office is combined, and electromagnetic continuity with the outside world is applied to the entire area of the outer peripheral surface. An electromagnetic discontinuity surface to be cut off is set, and a radio wave is transmitted and received in an ideal indoor space obtained thereby, thereby evaluating the indoor electromagnetic environment.

On the other hand, in the device of the present invention, a material equivalent to a building material applied when constructing a real indoor space such as an office is combined with a material equivalent to the material, and a radio wave absorber is provided over the entire outer peripheral surface thereof. , A transmitter capable of generating a high-frequency signal of an arbitrary frequency, a transmitting antenna installed inside the ideal indoor space structure, and a transmitter. It is characterized by using a receiver capable of detecting a high-frequency signal of the same quality as the above, and a receiving antenna provided inside the ideal indoor space structure.

More specifically, in solving the problem, the present invention achieves the above object by adopting a novel characteristic configuration method or means ranging from a high-level concept to a low-level concept listed below. Is done.

That is, the first feature of the method of the present invention is that it is constructed based on the same interchangeable physical environment conditions as the real indoor space, and that it absorbs radio waves entering and exiting the indoor space. An electromagnetic environment that measures various radio wave communication characteristics of transmitting and receiving radio waves and electromagnetic field characteristics based on the various radio wave communication characteristics in a space, and evaluates the effects on the radio wave communication environment and the electromagnetic environment by simulation. It consists in adopting the configuration of the evaluation method.

A second feature of the method according to the present invention is that it is configured based on the same interchangeable physical environmental conditions as a real indoor space,
In addition, it is possible to absorb radio waves entering and exiting indoors and outdoors, and furthermore, in an ideal indoor space with an electromagnetic shield applied thereon, various radio wave communication characteristics transmitting and receiving radio waves, and electromagnetic field characteristics based on the various radio wave communication characteristics , And the influence of the radio wave communication environment and the electromagnetic environment is evaluated by simulation.

According to a third feature of the method of the present invention, the interchangeable physical environmental conditions in the first or second feature of the method of the present invention can replace the type, material, and arrangement of the space constituting material. The configuration of the electromagnetic environment evaluation method is adopted.

A fourth feature of the method of the present invention is that the interchangeable physical environmental condition in the first, second or third feature of the method of the present invention is such that the type, material and arrangement of the structure in the space The present invention resides in the adoption of the configuration of the electromagnetic environment evaluation method that enables the replacement of the electromagnetic environment.

A fifth feature of the method of the present invention is that the transmission / reception of the radio wave in the first, second, third or fourth feature of the method of the present invention is opposed to two points in the ideal indoor space. The present invention resides in adoption of a configuration of an electromagnetic environment evaluation method performed between a pair of transmitting antenna means and receiving antenna means.

According to a sixth feature of the method of the present invention, the transmission and reception of the radio wave in the fifth feature of the method of the present invention is performed by fixing both the transmitting antenna means and the receiving antenna means or fixing one of the transmitting antenna means and the other. Of the electromagnetic environment evaluation method that is performed by intermittently moving one of the two.

A seventh feature of the method of the present invention is that a combination of a building material applied when constructing a real indoor space and a replaceable wall material, a replaceable ceiling material and a replaceable floor material, which are equivalent in material, respectively. And an ideal indoor space in which an electromagnetic discontinuity surface that interrupts electromagnetic continuity with the outside world is provided in the entire area of the outer peripheral surface, and radio waves are transmitted between any two points in the ideal indoor space. The various types of radio communication characteristics are measured by transmitting and receiving, and the electromagnetic environment of the ideal indoor space determined by the combination of the materials of the replaceable wall material, the replaceable ceiling material, and the replaceable floor material based on the measurement results at this time. In the configuration of an electromagnetic environment evaluation method that evaluates

According to an eighth feature of the method of the present invention, in addition to the seventh feature of the method of the present invention, the ideal indoor space for which the electromagnetic environment is evaluated is determined based on the result of measuring the various radio communication characteristics. Another object of the present invention is to adopt a configuration of an electromagnetic environment evaluation method used in a real indoor space and determined by the type, material, and location of various structures disposed in the ideal indoor space.

A ninth feature of the method of the present invention is that the various structures in the eighth feature of the method of the present invention are at least desks,
The present invention resides in the adoption of a configuration of an electromagnetic environment evaluation method including a chair and a partition wall.

A tenth feature of the method of the present invention resides in that, as the partition wall in the ninth feature of the above-described method of the present invention, an electromagnetic continuity between two partition spaces generated by the installation is partially cut off. The present invention resides in the adoption of a configuration of an electromagnetic environment evaluation method using a component having a partially discontinuous surface.

An eleventh feature of the method of the present invention is that the measurement of various radio wave communication characteristics in the seventh, eighth, ninth or tenth feature of the method of the present invention is different from the measurement of radio wave propagation characteristics in an ideal indoor space. The present invention resides in the adoption of the configuration of the electromagnetic environment evaluation method.

The twelfth feature of the method of the present invention is that the measurement of various radio wave communication characteristics in the seventh, eighth, ninth, or tenth feature of the method of the present invention can operate an arbitrary wireless system in an ideal indoor space. The present invention resides in the adoption of a configuration of an electromagnetic environment evaluation method including measurement of various wireless system communication characteristics when the wireless communication is performed.

According to a thirteenth feature of the method of the present invention, the measurement relating to the communication characteristics of various wireless systems in the twelfth feature of the method of the present invention is different from the measurement relating to the throughput characteristics when file transfer is performed by an arbitrary wireless system. The present invention resides in the adoption of the configuration of the electromagnetic environment evaluation method.

A fourteenth feature of the method of the present invention is that the measurement relating to the communication characteristics of various wireless systems in the twelfth feature of the method of the present invention relates to a bit error rate characteristic when a file is transferred by an arbitrary wireless system. The present invention resides in adopting a configuration of an electromagnetic environment evaluation method including measurement.

On the other hand, the first feature of the device of the present invention is that a replaceable wall material, a replaceable ceiling material and a replaceable floor material which are respectively equivalent in material to building materials applied when constructing a real indoor space are used. An ideal indoor space component having a combination thereof, and a radio wave absorber disposed in the entire outer peripheral surface thereof, and being installed outside the ideal indoor space component to generate a high-frequency signal of an arbitrary frequency. And a transmitting antenna connected to the transmitter and installed inside the ideal indoor space structure, and a transmitter installed outside the ideal indoor space structure and generated by the transmitter. A receiver capable of detecting a high-frequency signal of the same quality as that received, and a receiving antenna connected to the receiver and installed inside the ideal indoor space structure. Of the electromagnetic environment evaluation system In the adopted adult.

A second feature of the device of the present invention resides in that the ideal indoor space constituting member according to the first feature of the above-described device of the present invention has an electromagnetic shield material disposed over the entire outer peripheral surface of the radio wave absorber. Configuration of the electromagnetic environment evaluation system.

A third feature of the device of the present invention is that one of the transmitting antenna and the receiving antenna in the first or second feature of the device of the present invention is fixed, and the other is movable in the horizontal direction. The present invention resides in the adoption of a configuration of an electromagnetic environment evaluation system device which is semi-fixed in a specific form.

A fourth feature of the device of the present invention is that, in addition to the first or second feature of the device of the present invention, a transmitting antenna and a receiving antenna are further used in a real indoor space,
In addition, the present invention resides in adopting a configuration of an electromagnetic environment evaluation system device which is mounted on various structures arranged inside the ideal indoor space structure.

A fifth feature of the device of the present invention is that the various structures in the above-described fourth feature of the device of the present invention include at least a desk,
The present invention resides in the adoption of a configuration of an electromagnetic environment evaluation system device including a chair and a partition wall.

A sixth feature of the device of the present invention is that the partition wall in the fifth feature of the above-described device of the present invention employs the configuration of an electromagnetic environment evaluation system device in which a radio wave absorbing material is attached to at least a part of the partition wall. is there.

A seventh feature of the device of the present invention is that the partition wall in the fifth feature of the above-described device of the present invention adopts a configuration of an electromagnetic environment evaluation system device in which a radio wave reflecting material is attached to at least a part of its area. is there.

An eighth feature of the device of the present invention is that the transmitter, the transmitting antenna, the receiver and the transmitter according to the first, second, third, fourth, fifth, sixth or seventh feature of the above-described device of the present invention. The receiving antenna is installed outside the ideal indoor space structure,
A radio system base station capable of generating and detecting a digitally modulated high frequency signal in a predetermined frequency band, and a base connected to the radio system base station and installed inside an ideal indoor space structure A station antenna, and a wireless system slave unit that is installed outside the ideal indoor space structure and that can generate and detect a high-frequency signal of the same quality as that generated and detected by the wireless system base station, A slave unit antenna connected to the wireless system slave unit and installed inside the ideal indoor space structure;
The configuration and adoption of the electromagnetic environment evaluation system device that is configured to substitute for each.

A ninth feature of the device of the present invention resides in that the wireless system base station, base station antenna, wireless system slave unit, and slave unit antenna in the eighth feature of the above-described device of the present invention are wireless LAN system components. The present invention is based on the configuration of a certain electromagnetic environment evaluation system.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the accompanying drawings with reference to examples of apparatuses and methods.

(First Device Example) First, a first device example of the present invention will be described. FIG. 1 is a partially longitudinal side view showing a schematic configuration of an electromagnetic environment evaluation system apparatus according to a first apparatus example of the present invention, and FIG. 2 is an electromagnetic environment evaluation apparatus according to a modification of the first apparatus example of the present invention. It is a partial vertical side view showing a schematic configuration of a system device.

First, as shown in FIG. 1, the electromagnetic environment evaluation system device α according to the first device example is provided with an ideal indoor space structure 1 and installed outside the ideal indoor space structure 1. A transmitter 2 for measuring various radio communication characteristics capable of generating a high-frequency signal of an arbitrary frequency, and various radio communication connected to the transmitter 2 and installed inside the ideal indoor space structure 1 Transmission antenna 3 for measuring characteristics
And a receiver 4 for measuring various radio wave communication characteristics, which is installed outside the ideal indoor space structure 1 and is capable of detecting a high-frequency signal of the same quality as that generated by the transmitter 2. And a receiving antenna 5 for measuring various radio communication characteristics, which is installed inside the ideal indoor space structure 1.

Here, the ideal indoor space constituting body 1 is a replaceable wall material 11 (actually, four surrounding surfaces) each of which is equivalent in material to a building material applied when constructing a real indoor space such as an office. ), A replaceable ceiling material 12 and a replaceable floor material 13 are combined, and a radio wave absorber 14 is hermetically disposed around the entire outer peripheral surface thereof.

The above-described ideal indoor space structure 1 will be described in detail. First, the replaceable wall member 11 is formed of a partition-like wall which can be freely replaced. Metal material, gypsum board, wood, etc. can be selected. Further, the replaceable ceiling member 12 is made of a system ceiling or the like which can be freely replaced, and a gypsum board or a metal material such as aluminum can be selected as the material. Furthermore, exchangeable flooring 1
Reference numeral 3 denotes a double floor which can also be freely replaced, and the material thereof can be selected from concrete non-metallic materials and various metallic materials. The radio wave absorber 14 is hermetically enclosed and arranged on the entire outside of the ideal indoor space structure 1 including the inside of the ceiling (outside of the replaceable ceiling material 12) and the underfloor (outside of the replaceable floor material 13). In addition to preventing external leakage of radio waves existing inside the indoor space structure 1, it also functions so as to prevent internal penetration of radio waves existing outside the same.

On the other hand, as shown in FIG. 2, an electromagnetic environment evaluation system device α ′ according to a modification of the first device example is an ideal component in addition to the components of the electromagnetic environment evaluation system device α shown in FIG. The indoor space constituent body 1 is configured to include an electromagnetic shield material 15 arranged on the entire outer peripheral surface of the radio wave absorber 14.

The electromagnetic shield material 15 completely prevents the above-described external leakage and intrusion of radio waves, and in particular, uses various relatively strong radio waves inside the ideal indoor space structure 1 to perform various radio wave communication characteristics. Is to be installed when measuring (when characteristic measurement is performed using weak radio waves, the installation is not particularly required). That is, the ideal indoor space structure 1 in which the electromagnetic shielding material 15 is installed as described above.
When a relatively strong radio wave is radiated inside the antenna, a part of the radio wave is transmitted through the radio wave absorber 14 and reaches the electromagnetic shield member 15, where the external leakage of the radio wave is prevented. However, at this time, since the reflected wave generated by the electromagnetic shield material 15 is absorbed again by the radio wave absorber 14, the reflected wave does not exist inside the ideal indoor space constituting body 1, and the ideal (Electromagnetic shielding material 1
5 cannot be used alone).

The transmitting antenna 3 and the receiving antenna 5
Of these, one of them is fixed, and the other is semi-fixed so as to be movable in the horizontal direction. This is to enable data to be acquired at a plurality of points inside the ideal indoor space structure 1 at the time of measuring various radio wave communication characteristics described later. Various types of antenna moving means to be used at this time are conceivable. For example, a pole having a predetermined length to which an antenna (the transmitting antenna 3 or the receiving antenna 5) is attached is mounted on a bogie with the other end. And the carriage is placed on the upper surface of the replaceable floor material 13 or on a rail laid on the upper surface, and is moved by remote control outside the ideal indoor space structure 1. I just need.

(First Method Example) Next, a first method example applied to the first device example configured as described above will be described.

First, a replaceable wall material 11, a replaceable ceiling material 12, and a replaceable floor material 13 which are respectively equivalent in material to a building material used to construct a real indoor space such as an office are combined. In order to set an electromagnetic discontinuity surface that interrupts electromagnetic continuity with the outside world, a radio wave absorber 1
4 is used alone, or the radio wave absorber 14 and the electromagnetic shield material 15 are used in a double combination to provide an ideal indoor space structure 1 as a required ideal indoor space.

At this time, for convenience in forming an ideal indoor space (ideal indoor space constituting body 1), the radio wave absorber 1
4 may be attached in advance to each single surface (the surface that becomes outside at the time of arrangement) of the replaceable wall material 11, the replaceable ceiling material 12, and the replaceable floor material 13. Also, when applying the electromagnetic shielding material 15, it may be similarly attached to a required location.

Then, radio waves are transmitted and received between any two points in the ideal indoor space (inside the ideal indoor space structure 1) using the transmitter 2, the transmitting antenna 3, the receiver 4, and the receiving antenna 5. Various radio communication characteristics such as radio propagation characteristics, wireless system communication characteristics including throughput characteristics and bit error rate characteristics are measured, and the exchangeable wall material 11, the exchangeable ceiling material 12, and the The electromagnetic environment of the ideal indoor space determined by the combination of the materials of the bed changing material 13 is evaluated.

(Second Example) Next, a second example of the present invention will be described. FIG. 3 is a partial longitudinal side view showing a schematic configuration of an electromagnetic environment evaluation system device according to a second device example of the present invention, and FIG. 4 is an electromagnetic environment evaluation according to a modification of the second device example of the present invention. It is a partial vertical side view showing a schematic configuration of a system device.

First, as shown in FIG. 3, the electromagnetic environment evaluation system device β according to the second device example is the same as the first device shown in FIG.
The components of the electromagnetic environment evaluation system device α according to the device example are adopted as they are, and the desks 16a and 16b and the chairs 17a and 17a used in a real indoor space such as an office are further used.
17b, various structures such as partition walls (partitions) 18a, 18b are arranged inside the ideal indoor space structure 1, and the transmitting antenna 3 and the receiving antenna 5 are connected to the desks 16a, 1
6b.

Here, the partition walls 18a and 18b have radio wave absorbing materials 19a and 19b attached to at least a part of the area. Instead of the above-described radio wave absorbing materials 19a and 19b, a radio wave reflecting material made of a metal material (with the same reference numeral “19a, 19b”) may be used.

On the other hand, as shown in FIG. 4, an electromagnetic environment evaluation system apparatus β 'according to a modification of the second apparatus example is an ideal element in addition to the components of the electromagnetic environment evaluation system apparatus β shown in FIG. The electromagnetic shielding material 1 in which the indoor space constituting body 1 is hermetically disposed in the entire outer peripheral surface of the radio wave absorber 14.
5 and its functions are described in the first section.
This is exactly the same as that in the electromagnetic environment evaluation system device α 'according to the modification of the device example.

(Second Method Example) Next, a second method example applied to the second apparatus example configured as described above will be described.

First, various structures such as desks 16a and 16b, chairs 17a and 17b, and partition walls 18a and 18b used in a real indoor space such as an office are placed in an ideal indoor space (inside the ideal indoor space structure 1). In this state, various radio wave communication characteristics such as radio wave propagation characteristics, wireless system communication characteristics including throughput characteristics and bit error rate characteristics are measured, and based on the measurement results, types and materials of various structures are measured. And the electromagnetic environment of the ideal indoor space determined by the arrangement location is evaluated.

As the partition walls 18a and 18b,
In order to set an electromagnetic partial discontinuous surface that partially blocks electromagnetic continuity between two partition spaces generated by the installation, a radio wave absorbing material or a radio wave reflecting material 19a, 19b
The electromagnetic environment inside the ideal indoor space structure 1 is controlled by changing the size, the mounting position, and the like of the ideal indoor space structure 1.

[0059]

EXAMPLES Next, the results of measurements of various radio wave communication characteristics according to the present invention will be shown as examples with reference to the accompanying drawings.

(Premise) First, the premise for measuring various radio wave communication characteristics according to the present invention will be described. FIG. 5 is a perspective view showing the inner dimensions of the ideal indoor space structure 1 used for measuring various radio wave communication characteristics according to the present invention.

As shown in the figure, the ideal indoor space structure 1 is premised on measuring various radio wave communication characteristics according to the present invention.
The inside dimensions are 10.0 m long, 5.3 m wide, and 2.
Set to 8m. This inner size corresponds to a real indoor space having a floor area of 16 tsubo.

(First Embodiment) Next, as a first embodiment of the present invention, a mode for measuring radio wave propagation characteristics will be described. FIG.
Is a partial cross-sectional plan view showing a measurement system of radio wave propagation characteristics according to the present invention, and FIG. 7 is a graph showing measurement results of the radio wave propagation characteristics.

First, as shown in FIG. 6, when measuring the radio wave propagation characteristics according to the present invention, the electromagnetic environment evaluation system devices α and α ′ according to the first device example shown in FIG. 1 or FIG. The transmitting antenna 3 is set in the x-axis direction from the wall surface.
0 m, 2.65 m apart in the y-axis direction, and the receiving antenna 5 is moved at intervals of 2 cm from 2.0 m to 8.0 m in the x-axis direction. (Measurement point) is measured. The installation heights of the transmitting antenna 3 and the receiving antenna 5 are both 1.5 m.

The frequency of the radio wave (the generated high-frequency signal in the transmitter 2 and the detected high-frequency signal in the receiver 4) used for the actual measurement is set to 2.485 GHz, which is the center frequency of the frequency band used in the wireless LAN system. In addition, as the material of the ideal indoor space structure 1, a metal material is used for the replaceable wall material (11), a gypsum board is used for the replaceable ceiling material (12), and a replaceable floor material (13) is used. Metal materials were selected respectively.

When the radio wave propagation characteristics were measured by the above measurement system, as shown in FIG. 7, the measurement result (thick line) almost coincided with the electromagnetic field simulation calculation result (thin line) using ray tracing. (The dielectric constant of the interchangeable ceiling material in the simulation is 1.56 by actual measurement with a material measuring instrument, and the interchangeable wall material and the replaceable floor material are:
It was treated as if there were no irregularities on the surface).

In general, in this type of electromagnetic field simulation, calculations are performed using material constants such as the dielectric constant measured for each building material alone, but most of the material constants differ depending on the measurement system to be measured or may vary in actual use. May differ from the values in the environment. For this reason, when the simulation calculation result is different from the actual result, it is very difficult to determine whether the material constant is a problem or another element is a problem.

However, since the measurement results of the radio wave propagation characteristics according to the present invention agree well with the simulation calculation results, various electromagnetic field simulations can be verified. As a result, the material constants in a real indoor space can be verified. Alternatively, it is possible to clarify the optimal arrangement method of the wireless system, the optimum building material conditions for the use of the wireless system, and the indoor environment free from electromagnetic interference.

(Second Embodiment) Next, as a second embodiment of the present invention, a mode for measuring the throughput characteristic among the wireless system communication characteristics will be described. FIG. 8 is a partial cross-sectional plan view showing a throughput characteristic measurement system according to the present invention, and FIG. 9 is a graph showing the measurement result of the throughput characteristic.

First, as shown in FIG. 8, when measuring the throughput characteristics according to the present invention, the electromagnetic environment evaluation system devices α and α ′ according to the first device example shown in FIG. 1 or FIG.
Wireless LAN used for wireless LAN system
Base station antenna 3 'and wireless LAN handset antenna 5'
Is installed in the same form as the first embodiment. And
As a component of the wireless LAN system, a wireless LAN base station 2 'replacing the transmitter (2) and a wireless LAN slave unit 4' replacing the receiver (4) are prepared.
The HUB (hub) 6, the workstation 7, and the personal computer 8 of T are connected to each other, and a file transfer of 5 MB is performed using an FTP command to measure the throughput characteristic at 301 measurement points.

The frequencies of the digitally modulated radio waves (the generated high-frequency signal in the wireless LAN base station 2 'and the detected high-frequency signal in the wireless LAN slave unit 4') used for the actual measurement are also the same as those in the first embodiment. Similarly, 2.4 is the center frequency of the frequency band used in the wireless LAN system.
85 GHz, and as a material of the ideal indoor space structure 1, after fixing a replaceable ceiling material (12) to a non-metallic material such as a gypsum board, a replaceable wall material (11) and a replaceable floor material ( 1
3) and <1> wall: non-metallic material, floor: non-metallic material, <2>
Wall: Non-metallic material, Floor: Metallic material, <3> Wall: Metallic material, Floor: Non-metallic material, <4> Wall: Metallic material, Floor: Metallic material And

When the throughput characteristics were measured by the above measurement system, as shown in FIG. 9 (the horizontal axis is the throughput satisfaction, and the vertical axis is the ratio of the positions satisfying the throughput at the 301 measurement points). When a metal material is used as the exchangeable wall material (11), the throughput characteristics are extremely deteriorated, and the throughput becomes the worst (<3).
> Wall: metal material, floor: non-metal material), it is understood that only about 40% of the positions satisfy the throughput of 10% or more. In other words, almost no communication is possible at about 60% of the measurement points.

On the other hand, when the exchangeable wall material (11) is a non-metal material (<1> wall: non-metal material, floor: non-metal material, <2>
It can be understood that the throughput is 90% or more at most of the measurement points (wall: non-metal material, floor: metal material).
Therefore, from these results, when constructing a wireless LAN system, it is desirable that the wall in the actual indoor space be made of a nonmetallic material, and from this, an optimal indoor environment for the wireless system is configured. You can get guidelines for building materials.

As described above, as the first embodiment and the second embodiment,
Although the case of measuring the radio wave propagation characteristic and the throughput characteristic has been described as an example, in the present invention, the bit error rate characteristic (BER characteristic) of the wireless system communication characteristic is also shown in FIG. Can be measured using the measurement system shown in FIG. Although not particularly described, these characteristic measurements are naturally applied to the electromagnetic environment evaluation system devices β and β ′ according to the second device example shown in FIG. 3 or FIG. In the measurement, it is possible to verify the electromagnetic field simulation, or to clarify the optimal arrangement method of the wireless system, the optimum building material conditions for the wireless system, and the indoor environment where no radio interference occurs.

The present invention is not necessarily limited to the means and methods described above, but can be appropriately modified and implemented within the scope of achieving the object of the present invention and having the effects described below. It is something.

[0075]

As described above, according to the present invention,
Combine building materials applied when constructing a real indoor space with interchangeable wall materials, interchangeable ceiling materials, and interchangeable floor materials that are equivalent in material, and electromagnetically communicate with the outside world over the entire area of the outer peripheral surface. Because an ideal indoor space was set by setting an electromagnetic discontinuity surface that interrupts continuity, and various radio communication characteristics were measured by transmitting and receiving radio waves between any two points in the ideal indoor space. The electromagnetic environment of the ideal indoor space determined by the combination of the materials of the replaceable wall material, the replaceable ceiling material, and the replaceable floor material based on the measurement results at this time, and the types, materials, and locations of various structures. The electromagnetic environment of the ideal indoor space determined by the above can be accurately evaluated.

The measurement results of various radio wave communication characteristics according to the present invention are in good agreement with various electromagnetic field simulations, and it is possible to verify the simulation calculation results and the material constants of building materials. By using, it is possible to clarify the optimal indoor environment configuration method and wireless device arrangement method for the wireless system.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal side view showing a schematic configuration of an electromagnetic environment evaluation system device according to a first device example of the present invention.

FIG. 2 is a partially longitudinal side view showing a schematic configuration of an electromagnetic environment evaluation system device according to a modification of the first device example of the present invention.

FIG. 3 is a partially longitudinal side view showing a schematic configuration of an electromagnetic environment evaluation system device according to a second device example of the present invention.

FIG. 4 is a partially longitudinal side view showing a schematic configuration of an electromagnetic environment evaluation system device according to a modification of the first device example of the present invention.

FIG. 5 is a perspective view showing the inner dimensions of an ideal indoor space structure used for measuring various radio wave communication characteristics according to the present invention.

FIG. 6 is a partial cross-sectional plan view showing a measurement system of radio wave propagation characteristics according to the present invention.

FIG. 7 is a graph showing measurement results of the radio wave propagation characteristics.

FIG. 8 is a partial cross-sectional plan view showing a measurement system of a throughput characteristic according to the present invention.

FIG. 9 is a graph showing measurement results of the throughput characteristics.

[Explanation of symbols]

 α, α ', β, β' ... electromagnetic environment evaluation system device 1 ... ideal indoor space structure 11 ... replaceable wall material 12 ... replaceable ceiling material 13 ... replaceable floor material 14 ... radio wave absorber 15 ... electromagnetic shielding material 16a, 16b ... desks 17a, 17b ... chairs 18a, 18b ... partition walls (partitions) 19a, 19b ... radio wave absorbing material (or radio wave reflecting material) 2 ... transmitter 2 '... wireless LAN base station 3 ... transmitting antenna 3' ... Wireless LAN base station antenna 4 ... Receiver 4 '... Wireless LAN slave unit 5 ... Reception antenna 5' ... Wireless LAN slave unit antenna 6 ... HUB (hub) 7 ... Workstation 8 ... Personal computer

Claims (23)

[Claims] 1. A radio wave is transmitted and received in an ideal indoor space which is configured based on the same interchangeable physical environment conditions as a real indoor space and which can absorb radio waves entering and exiting the room. An electromagnetic environment evaluation method characterized by measuring various radio wave communication characteristics and electromagnetic field characteristics based on the various radio wave communication characteristics, and performing simulation evaluation of effects on a radio wave communication environment and an electromagnetic environment. 2. An ideal indoor space constructed based on the same interchangeable physical environment conditions as a real indoor space, and capable of absorbing radio waves entering and exiting indoors and outdoors, and further provided with an electromagnetic shield thereon. Within, various radio wave communication characteristics that performed transmission and reception of radio waves, electromagnetic field characteristics based on the various radio wave communication characteristics,
And evaluating the effects on the radio communication environment and the electromagnetic environment by simulation. 3. The electromagnetic environment evaluation method according to claim 1, wherein the interchangeable physical environmental conditions allow replacement of the type, material, and arrangement of the space constituent material. 4. The electromagnetic environment according to claim 1, wherein the interchangeable physical environmental conditions allow replacement of the type, material, and arrangement of the structure in the space. Evaluation methods. 5. The transmission / reception of the radio wave is performed between a pair of transmission antenna means and reception antenna means facing two points in the ideal indoor space. 4. The method for evaluating an electromagnetic environment according to item 4. 6. The transmission / reception of the radio wave, wherein both the transmission antenna means and the reception antenna means are fixed, or one is fixed and the other is intermittently moved. The described electromagnetic environment evaluation method. 7. A combination of a building material applied when constructing a real indoor space and a replaceable wall material, a replaceable ceiling material and a replaceable floor material, which are equivalent in material, respectively, An ideal indoor space in which an electromagnetic discontinuity surface that blocks electromagnetic continuity with the outside world is provided in all areas, and radio waves are transmitted and received between any two points in the ideal indoor space by various types of radio communication Measuring the characteristics, and evaluating the electromagnetic environment of the ideal indoor space determined by the combination of the materials of the replaceable wall material, the replaceable ceiling material, and the replaceable floor material based on the measurement result at this time. Electromagnetic environment evaluation method. 8. The ideal indoor space for which the electromagnetic environment is evaluated is based on a result of measuring the various radio wave communication characteristics, and is further used in the real indoor space and disposed in the ideal indoor space. The method according to claim 7, wherein the method is determined by a type, a material, and a location of the structure. 9. The electromagnetic environment evaluation method according to claim 8, wherein the various structures include at least a desk, a chair, and a partition wall. 10. A partition wall having an electromagnetic partially discontinuous surface that partially blocks electromagnetic continuity between two partition spaces generated by its installation is used as the partition wall. The electromagnetic environment evaluation method according to claim 9, wherein: 11. The electromagnetic environment evaluation method according to claim 7, wherein the measurement of the various radio wave communication characteristics includes a measurement of a radio wave propagation characteristic in the ideal indoor space. 12. The wireless communication system according to claim 7, wherein the measurement of various radio communication characteristics includes a measurement of various radio system communication characteristics when an arbitrary radio system is operated in the ideal indoor space. The method for evaluating an electromagnetic environment according to 9 or 10. 13. The electromagnetic environment evaluation according to claim 12, wherein the measurement related to the communication characteristics of the various wireless systems includes a measurement related to a throughput characteristic when a file is transferred by the arbitrary wireless system. Method. 14. The electromagnetic apparatus according to claim 12, wherein the measurement related to the communication characteristics of the various wireless systems includes a measurement related to a bit error rate characteristic when a file is transferred by the arbitrary wireless system. Environmental evaluation method. 15. A combination of a building material applied when constructing a real indoor space and a replaceable wall material, a replaceable ceiling material, and a replaceable floor material, which are equivalent in material, respectively. An ideal indoor space structure in which radio wave absorbers are arranged in all regions; a transmitter installed outside the ideal indoor space structure and capable of generating a high-frequency signal of an arbitrary frequency; A transmitting antenna connected to a device and installed inside the ideal indoor space structure. A receiver capable of detecting a signal, and a receiving antenna connected to the receiver and installed inside the ideal indoor space structure, Electromagnetic environment evaluation system . 16. The electromagnetic environment according to claim 15, wherein the ideal indoor space constituting member has an electromagnetic shielding material disposed on the entire outer peripheral surface of the radio wave absorber. Evaluation system equipment. 17. The transmission antenna and the reception antenna, wherein one of them is fixed, and the other is semi-fixed so as to be movable in the horizontal direction. The electromagnetic environment evaluation system device according to 1. 18. The transmission antenna and the reception antenna, further comprising: being used in the real indoor space, and being mounted on various structures arranged inside the ideal indoor space structure, respectively. The electromagnetic environment evaluation system device according to claim 15 or 16, wherein: 19. The electromagnetic environment evaluation system device according to claim 18, wherein said various structures include at least a desk, a chair, and a partition wall. 20. The electromagnetic environment evaluation system device according to claim 19, wherein the partition wall is formed by attaching a radio wave absorbing material to at least a part of the partition wall. 21. The electromagnetic environment evaluation system device according to claim 19, wherein the partition wall is formed by attaching a radio wave reflection material to at least a part of the partition wall. 22. The transmitter, the transmitting antenna, the receiver, and the receiving antenna are installed outside the ideal indoor space structure, and generate and detect a digitally modulated high-frequency signal in a predetermined frequency band. And a base station antenna connected to the wireless system base station and installed inside the ideal indoor space structure, and installed outside the ideal indoor space structure A wireless system slave unit capable of generating and detecting a high-frequency signal of the same quality as that generated and detected by the wireless system base station; and 21. The portable device antenna installed inside the spatial structure, and the portable device antenna and the portable device antenna are respectively configured and replaced. Electromagnetic environment evaluation system according to 21. 23. The electromagnetic environment evaluation system according to claim 22, wherein said wireless system base station, base station antenna, wireless system slave unit, and slave unit antenna are each a system component of a wireless LAN. apparatus.