KR20210103949A - Radio wave shielding chamber and radio wave test method - Google Patents

Abstract

An electric wave shield chamber is equipped with: a chamber; a first partition wall, as the first partition wall dividing an inner space for which a test object is disposed and an outer space surrounding the inner space, capable of transmitting electric waves through a space in the chamber; a temperature control unit that controls a temperature of the inner space; and a dehumidifying part that dehumidifies the outer space. Therefore, the present invention is capable of suppressing a diffused reflection of the electric wave.

Description

Radio shield chamber and radio wave test method

The present invention relates to a radio wave shield chamber and a radio wave test method.

BACKGROUND ART As described in Japanese Patent No. 4440002 (Patent Document 1), there is known a radio wave shield chamber used for a test or the like of performance evaluation of a communication device. This radio wave shield chamber is designed in such a way that radio waves do not penetrate into the chamber from the outside and radio waves do not leak from the inside of the chamber to the outside. called darkroom).

In the radio wave dark room described in Patent Document 1, the radio wave absorber is disposed on the inner surface of the electromagnetic shield room, and a cover surrounding the electronic device as a test body is disposed in the electromagnetic shield room, The temperature of the space in the cover can be adjusted. Thereby, the performance evaluation test is performed in the state in which the ambient temperature of an electronic device was maintained constant.

In the radio wave dark room described in Patent Document 1, the following problems may occur when testing is performed in a state in which the space in the cover is temperature-controlled at a low temperature. That is, when low-temperature air is supplied from the air conditioning equipment to the space inside the cover through the duct, the cover is also filled with the low-temperature air, and the temperature of the outer surface of the cover is below the dew point temperature of the outer space (the space between the outer surface of the cover and the radio wave absorber). Sometimes it goes down to In this case, dew water is generated on the outer surface of the cover, and a problem arises that radio waves are diffusely reflected by the dew water in the chamber.

An object of the present invention is to provide a radio wave shield chamber and radio wave test method capable of suppressing diffuse reflection of radio waves due to dew water in the chamber.

A radio wave shield chamber according to an aspect of the present invention is a first partition wall dividing a chamber and a space in the chamber into an inner space in which a test object is disposed and an outer space surrounding the inner space, wherein the first partition wall capable of transmitting radio waves is provided. A partition wall, a temperature control unit for temperature-regulating the inner space, and a dehumidifying unit for dehumidifying the outer space are provided.

A radio wave shield chamber according to another aspect of the present invention is a first partition wall dividing the chamber and a space in the chamber into an inner space in which a test object is disposed and an outer space surrounding the inner space, wherein the first partition wall capable of transmitting radio waves A partition wall, a temperature control unit for temperature-regulating the inner space, and a heating unit for heating the first partition wall are provided.

In a radio wave test method according to another aspect of the present invention, at least the test object among the test object and the antenna for transmitting and receiving radio waves between the test object and the inner space divided by the first partition wall in the chamber and the inner space It includes installing in the inner space of the surrounding outer space, and evaluating the transmission/reception state of radio waves between the test object and the antenna while temperature-controlling the inner space and dehumidifying the outer space.

In a radio wave test method according to another aspect of the present invention, at least the test object among the test object and the antenna for transmitting and receiving radio waves between the test object and the inner space divided by the first partition wall in the chamber and the inner space It includes installing in the inner space among the surrounding outer spaces, and evaluating the transmission/reception state of radio waves between the test object and the antenna while controlling the temperature of the inner space and heating the first partition wall.

According to the present invention, it is possible to provide a radio wave shield chamber and radio wave test method capable of suppressing diffuse reflection of radio waves due to dew water in the chamber.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically the structure of the radio wave shield chamber which concerns on Embodiment 1 of this invention.
2 is a flowchart for explaining the radio wave test method according to the first embodiment of the present invention.
3 is a flowchart for explaining the operation control of the dry air unit in the modified example of the first embodiment of the present invention.
4 is a flowchart for explaining the operation control of the dry air unit according to the second embodiment of the present invention.
5 is a diagram schematically showing the configuration of a radio wave shield chamber according to Embodiment 3 of the present invention.
6 is a diagram schematically showing the configuration of a radio wave shield chamber according to a fourth embodiment of the present invention.
7 is a diagram schematically showing the configuration of a radio wave shield chamber according to Embodiment 5 of the present invention.
Fig. 8 is a flowchart for explaining the radio wave test method according to the fifth embodiment of the present invention.
9 is a flowchart for explaining the control of the dry air unit and the heating unit according to the sixth embodiment of the present invention.
10 is a flowchart for explaining the control of the dry air unit and the heating unit in a modified example of the sixth embodiment of the present invention.
11 is a diagram schematically showing the configuration of a radio wave shield chamber according to an eighth embodiment of the present invention.
12 is a diagram schematically showing the configuration of a radio wave shield chamber according to a ninth embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, based on drawing, the radio wave shield chamber and radio wave test method which concern on embodiment of this invention are demonstrated in detail.

(Embodiment 1)

First, the configuration of the radio wave shield chamber 1 according to the first embodiment of the present invention will be described with reference to FIG. 1 . The radio wave shield chamber 1 is used for performance evaluation of, for example, a communication device using a high-frequency radio wave, an in-vehicle module, or the like. As shown in FIG. 1 , the radio wave shield chamber 1 includes a chamber 10 , a first partition wall 30 , a radio wave absorber 40 , a temperature control unit 50 , and a dehumidifying unit 60 . A shield member 80 and a control unit 70 are mainly provided. Hereinafter, each of these components will be described.

The chamber 10 is an upper body in which the space 20 is formed, and it is possible to suppress the intrusion of radio waves from the outside of the chamber into the space 20 and the leakage of radio waves from the space 20 to the outside of the chamber. is well composed. The chamber 10 includes an external wound 11 and an inner wound 12 disposed inside the external wound 11 with an air layer 10A interposed therebetween. include The outer box 11 and the inner box 12 are made of, for example, a conductive material such as a stainless steel plate, and are grounded, respectively. In addition, a heat insulating material 13 made of urethane foam or the like is provided on the outer surface of the outer box 11 (the surface facing the side opposite to the air layer 10A).

The first partition wall 30 divides the space 20 in the chamber 10 into an inner space 21 and an outer space 22 surrounding the inner space 21 . Specifically, the first partition wall 30 is made of an upper body smaller than the inner box 12 , and a test body S1 such as a communication device or an in-vehicle module is disposed in the inner space 21 . The first partition wall 30 is capable of transmitting radio waves transmitted and received by the test body S1. For example, a foam material such as foamed styrene or a resin material such as FRP (Fiber Reinforced Plastics) is used, but is not limited thereto. does not Moreover, the inner side temperature sensor 23 and the inner humidity sensor 24 are arrange|positioned in the inner space 21, and the outer side temperature sensor 25 and the outer humidity sensor 26 are arrange|positioned in the outer space 22.

The radio wave absorber 40 is a mixture of, for example, urethane foam or the like with carbon powder, and absorbs radio waves due to dielectric loss (dielectric wave absorber). The radio wave absorber 40 is disposed in the outer space 22, specifically, provided on the inner surface of the inner casing 12 (the surface facing the outer space 22 side) (FIG. 1). In addition, the radio wave absorber 40 is not limited to a dielectric radio wave absorber, for example, a conductive radio wave absorber made of conductive fiber and absorbing radio waves due to internal resistance of the material, and propagation due to magnetic loss such as a ferrite core. It may be a magnetic wave absorber that absorbs .

The temperature control unit 50 controls the temperature of the inner space 21 , and includes a temperature control unit 51 , an air supply duct 52 , and an air discharge duct 53 . The temperature control unit 51 includes devices such as a heater, a refrigerator, a humidifier, and a fan (not shown), and generates air-conditioning air whose temperature and humidity is controlled.

One end of the air supply duct 52 is connected to the air outlet of the temperature control unit 51 , and passes through the heat insulating material 13 , the outer box 11 , the inner box 12 , and the first partition wall 30 to the inside. It extends to the space 21 . An air supply port 52A opened to the inner space 21 is formed at the other end of the air supply duct 52 (the end opposite to the one end connected to the temperature control unit 51 ). The air-conditioning air whose temperature and humidity was adjusted by the temperature control part 51 flows in the inside of the air supply duct 52, and is supplied to the inner space 21 from 52A of air supply ports.

The air exhaust duct 53 has one end connected to the air inlet of the temperature control unit 51 , and similarly to the air supply duct 52 , the heat insulating material 13 , the outer box 11 , the inner box 12 , and the first It extends through the partition wall 30 to the inner space 21 . At the other end of the air discharge duct 53 (the end opposite to the one end connected to the temperature control unit 51 ), an air discharge port 53A that opens into the inner space 21 is formed.

The air in the inner space 21 is discharged into the air discharge duct 53 from the air discharge port 53A, and returns to the air inlet of the temperature control unit 51 through the air discharge duct 53 . As described above, the air conditioning air whose temperature and humidity is controlled circulates between the temperature control unit 51 and the inner space 21 through the air supply duct 52 and the air exhaust duct 53 .

The dehumidifying unit 60 dehumidifies the outer space 22 . The dehumidifying unit 60 in the present embodiment includes a drying gas generating unit 61 disposed outside the chamber 10 , and a drying unit for supplying the drying gas generated in the drying gas generating unit 61 to the outer space 22 . It includes a gas supply path 62 and a drying gas discharge path 63 for discharging the drying gas out of the chamber 10 from the outer space 22 .

The dry gas generating part 61 consists of, for example, a dry air unit, and generates dry air by removing moisture from compressed air with a desiccant such as silica gel. In addition, the dry gas generating part 61 may remove moisture with a cooler, or a dry dehumidifier may be sufficient as it. The drying gas supply path 62 has one end connected to the outlet of the drying gas generator 61 , and extends to the outer space 22 through the heat insulating material 13 , the outer box 11 , and the inner box 12 . have. At the other end of the drying gas supply path 62 (the end opposite to the one end connected to the drying gas generator 61 ), it opens into the outer space 22 , and is generated by the dry gas generator 61 . A drying gas supply port 62A for supplying drying gas (dry air) to the outer space 22 is formed. The drying gas supply path 62 consists of a duct, for example.

The drying gas discharge path 63 is provided with a drying gas discharge port 63A that opens to the outer space 22 and a dry gas discharge port 63B that opens into the outer space (in the air) of the chamber 10 . . The dry air supplied into the outer space 22 is discharged to the outside of the chamber 10 through the drying gas discharge path 63 , and then is discharged to the atmosphere from the drying gas discharge port 63B.

As shown in FIG. 1 , the drying gas discharge port 63A is located on the opposite side to the side where the drying gas supply port 62A is located with the space 20 of the chamber 10 interposed therebetween. Specifically, the drying gas discharge path 63 passes through the wall 15 opposing the wall 14 through which the drying gas supply path 62 penetrates among the plurality of walls constituting the chamber 10 . . The drying gas supply port 62A and the drying gas discharge port 63A are respectively located so that the inner space 21 may be interposed therebetween. In addition, 62 A of drying gas supply ports and 63 A of drying gas discharge ports may mutually oppose and do not need to oppose each other.

The shield member 80 is a member that allows air to pass and reflects radio waves, and as shown in FIG. 1 , an air supply port 52A, an air outlet port 53A, a drying gas supply port 62A, and a drying gas. They are respectively attached to the discharge port 63A. As a result, air conditioning air can flow through the air supply port 52A and the air discharge port 53A, and dry air can flow through the dry gas supply port 62A and the dry gas discharge port 63A. The leakage of radio waves from the four openings is also suppressed. Note that the shield member 80 is not an essential component in the radio wave shield chamber of the present invention, and measures to prevent radio wave leakage from the opening may be taken by other commonly used methods.

The control unit 70 is a controller that controls various operations in the radio wave shield chamber, and includes the reception unit 71 , the storage unit 72 , the determination unit 73 , the temperature control control unit 75 , and the drying gas. a control unit 76 . The acceptance unit 71 , the determination unit 73 , the temperature control control unit 75 , and the dry gas control unit 76 are functions executed by a central processing unit (CPU) of the controller. The storage unit 72 is constituted by a storage device such as a memory.

The receiving unit 71 receives signals of measurement data from each of the inner temperature sensor 23 , the inner humidity sensor 24 , the outer temperature sensor 25 , and the outer humidity sensor 26 . In the storage unit 72 , data of the set temperature and set humidity of the inner space 21 are stored. In addition, the storage unit 72 also stores reference data for determining whether to supply dry gas to the outer space 22 (for example, dry gas supply reference temperature).

The determination unit 73 compares the data of the set temperature and humidity of the inner space 21 obtained from the storage unit 72 with the data of the measured temperature and humidity of the inner space 21 obtained from the reception unit 71, and determines the magnitude relationship. do. Moreover, the determination part 73 compares the data of the set temperature of the inner space 21 acquired from the memory|storage part 72, and the data of the dry gas supply reference temperature, and determines the magnitude relationship.

The temperature adjustment control part 75 is based on the determination result (the result of the comparison determination of the set temperature-humidity of the inner space 21 and the measured temperature-humidity of the inner space 21) by the determination part 73, The temperature adjustment part 51 ) to control the operation. Specifically, the temperature control control unit 75 controls the outputs of the heater, the refrigerator and the humidifier, respectively, based on the determination result, so that the actual temperature and humidity of the inner space 21 approaches the set temperature and humidity (feedback control). .

The drying gas control unit 76 in the present embodiment controls the drying gas generation unit 61 (dry air unit) based on the set temperature of the inner space 21 . Specifically, the dry gas control unit 76 controls the dry air unit based on the determination result by the determination unit 73 (the result of comparison determination between the set temperature of the inner space 21 and the dry gas supply reference temperature). make it work

Next, the radio wave test method according to the present embodiment will be described with reference to the flowchart of FIG. 2 . In this radio wave test method, as follows, temperature control and dehumidification of the inner space 21 in the chamber 10 and transmission and reception of radio waves between the test object S1 and the antenna S2 Evaluate the status.

First, the test object S1 (for example, a communication device such as a smartphone or an in-vehicle module, etc.) is installed in the inner space 21 and the antenna S2 is installed in the outer space 22 (Step S10) . The antenna S2 transmits/receives radio waves to and from the test body S1.

Next, the temperature (test temperature) of the inner space 21 in the chamber 10 is set (step S20). In this embodiment, the set temperature of the inner space 21 is set to minus 40 degreeC, for example.

Next, the temperature control unit 50 is operated (step S30). In this step S30, while circulating the air conditioning air between the temperature control unit 51 and the inner space 21, so that the temperature of the inner space 21 is close to the set temperature, the temperature control control unit 75 is the temperature control unit ( 51) to control the operation. Specifically, the temperature of the inner space 21 is measured by the inner temperature sensor 23, and when the measured temperature is higher than the set temperature, the temperature control control unit 75 lowers the output of the heater, or the output of the refrigerator raise the On the other hand, when the measured temperature of the inner space 21 is lower than the set temperature, the temperature control control part 75 raises the output of a heater, or lowers the output of a refrigerator.

On the other hand, after the temperature of the inner space 21 is set in the step S20 , the determination unit 73 determines whether the set temperature of the inner space 21 is equal to or less than the dry gas supply reference temperature (step S40 ). In this embodiment, the dry gas supply reference temperature is preset to, for example, 10°C. For this reason, the determination part 73 determines that the set temperature (minus 40 degreeC) of the inner space 21 is below the dry gas supply reference temperature (10 degreeC) (YES in step S40).

Based on the determination result, the dry gas control unit 76 operates the dry air unit (step S50). Thereby, dry air is supplied to the outer space 22, and the outer space 22 is dehumidified. As a result, the dew point temperature of the outer space 22 falls.

In this way, while the temperature control of the inner space 21 and the dehumidification of the outer space 22 are performed in parallel, the transmission/reception state of the radio wave between the test body S1 and the antenna S2 is evaluated. Specifically, the antenna S2 receives the radio wave emitted from the test body S1, and evaluates whether or not an appropriate radio wave is being emitted from the test body S1. Moreover, it is evaluated whether the test object S1 is receiving the radio wave emitted from the antenna S2. And if the test termination condition is satisfied (YES in step S60), the operation of the temperature control unit 50 and the dry air unit is stopped, and the present radio wave test method is ended.

On the other hand, when the test termination condition is not satisfied (NO in step S60), the process returns to the determination in step S40. Then, when the set temperature of the inner space 21 is changed during the test and the set temperature after the change is higher than the dry gas supply reference temperature (NO in step S40), the dry gas control unit 76 controls the operation of the dry air unit. It stops (step S70). Thereafter, the set temperature of the inner space 21 is changed again until the test end condition is satisfied, and when the set temperature after the change is equal to or less than the dry gas supply reference temperature (YES in step S40), the dry gas control unit ( 76) restarts the operation of the dry air unit (step S50).

As described above, according to the radio wave shield chamber 1 according to the present embodiment, the humidity of the outer space 22 in the chamber 10 can be lowered by the dehumidifying unit 60 . For this reason, even if the outer surface temperature of the 1st partition wall 30 falls by temperature-regulating the inner space 21 in the chamber 10 to low temperature (for example, minus 40 degreeC), the said outer surface temperature is the outer space 22 It can suppress becoming below the dew point temperature of That is, the outer space 22 can be dehumidified so that the dew point temperature of the outer space 22 is lowered to the outer surface temperature of the first partition wall 30 or less. Thereby, generation|occurrence|production of the dew condensation water in the outer surface of the 1st partition wall 30 can be suppressed, and the diffuse reflection of the radio wave by the dew condensation water in the chamber 10 can be suppressed. In addition, performance degradation of the radio wave absorber 40 due to dew water can be suppressed.

In addition, in order to suppress a decrease in the temperature of the outer surface of the first partition wall 30, if the first partition wall 30 is thickened to increase the thermal insulation performance, the radio wave transmission performance of the first partition wall 30 decreases. . On the other hand, in this embodiment, since dry air is supplied to the outer space 22, it is not necessary to form the 1st partition wall 30 thickly. For this reason, it is possible to suppress the generation|occurrence|production of the dew condensation water in the outer surface of the 1st partition wall 30, suppressing the fall of the radio wave transmission performance of the 1st partition wall 30. As shown in FIG.

Here, the modified example of this embodiment is demonstrated.

<Modification 1>

In this embodiment, although the case where the dry air unit is controlled based on the set temperature of the inner space 21 was demonstrated, based on the measured temperature of the inner space 21 (measured value of the inner temperature sensor 23), drying The gas control unit 76 may control the dry air unit. Specifically, the control shown in the flowchart of FIG. 3 may be executed.

Steps S11 to S31 in FIG. 3 are the same as steps S10 to S30 in FIG. 2 . In this modified example, after the operation of the temperature control unit 50 is started in step S31 , the temperature of the inner space 21 is always measured or the temperature of the inner space 21 is measured by the inner temperature sensor 23 at a predetermined time interval, and the measured temperature The determination unit 73 determines whether or not is below the dry gas supply reference temperature (eg, 10° C.) (step S41).

For example, when the set temperature is low temperature, immediately after the operation of the temperature control unit 50 is started, and the temperature of the inner space 21 has not sufficiently decreased, the measured temperature of the inner space 21 is the dry gas. It is determined that it is higher than the supply reference temperature (NO in step S41). In this case, the dry air unit remains in a stopped state (step S71), and if &quot;NO&quot; is determined in step S61, the flow returns to step S41.

Then, when a certain period of time has elapsed from the start of the operation of the temperature control unit 50, the measured temperature of the inner space 21 decreases, and it is determined that the measured temperature is equal to or less than the dry gas supply reference temperature (YES in step S41). In this case, the dry gas control unit 76 starts the operation of the dry air unit (step S51).

Then, as long as the test end condition is satisfied, the determination in step S41 is repeated. As long as the measured temperature of the inner space 21 is maintained below the dry gas supply reference temperature, the dry air unit is not operated. Continue. According to this modification, since the dry air unit is maintained in a stationary state until the temperature of the inner space 21 falls below the dry gas supply reference temperature, the temperature control of the inner space 21 is started. Compared with the case of operating a dry air unit, power saving can be achieved.

<Modification 2>

In step S40 in FIG. 2 , it may be determined whether or not the set temperature of the inner space 21 is equal to or less than the measured temperature of the outer space 22 . Then, when the set temperature of the inner space 21 is equal to or less than the measured temperature of the outer space 22 , the dry air unit is started (or continues to operate), and the set temperature of the inner space 21 is the temperature of the outer space 22 . When the temperature is higher than the measurement temperature, the operation of the dry air unit may be stopped (or the operation stopped) may be continued.

<Modification 3>

In step S41 in FIG. 3 , it may be determined whether the measured temperature of the inner space 21 is equal to or less than the measured temperature of the outer space 22 . Then, when the measured temperature of the inner space 21 is equal to or less than the measured temperature of the outer space 22 , the dry air unit is started (or continues to operate), and the measured temperature of the inner space 21 is the measured temperature of the outer space 22 . When the temperature is higher than the measurement temperature, the operation of the dry air unit may be stopped (or the operation stopped) may be continued.

(Embodiment 2)

Next, a radio wave shield chamber and radio wave test method according to the second embodiment of the present invention will be described. The radio wave shield chamber and radio wave test method according to the second embodiment are basically the same as those of the first embodiment, but when the set temperature of the inner space 21 is equal to or lower than the dew point temperature of the outer space 22, dry the air with the outer space 22 It is different in that the dry gas control unit 76 controls the dry air unit so that air is supplied. Hereinafter, only the points which differ from the said Embodiment 1 are demonstrated.

In the second embodiment, the control unit 70 further includes an arithmetic unit (not shown) in addition to the configuration described in the first embodiment. The calculation unit calculates the dew point temperature of the inner space 21 and the outer space 22 based on the temperature-humidity data of the inner space 21 and the outer space 22 .

4 : has shown the radio wave test method (control flow of the dry air unit by the control part 70) in Embodiment 2. FIG. Steps S12 to S32 in FIG. 4 are the same as steps S10 to S30 in FIG. 2 .

In the present embodiment, after the step S22, the temperature and humidity of the outer space 22 are measured at all times or at predetermined time intervals by the outer temperature sensor 25 and the outer humidity sensor 26, and based on the measurement result, The calculating section calculates the actual dew point temperature of the outer space 22 . And in step S42, the determination part 73 determines whether the set temperature of the inner space 21 is below the dew point temperature of the outer space 22.

When the set temperature of the inner space 21 (for example, minus 40° C.) is equal to or less than the dew point temperature of the outer space 22 (YES in step S42), the dry gas control unit 76 starts the operation of the dry air unit ( step S52). Thereby, dry air is supplied to the outer space 22, and when the humidity of the outer space 22 falls, the dew point of the said outer space 22 falls.

The determination in step S42 is repeated until the test end condition is satisfied. And when the dew point temperature of the outer space 22 decreases by supply of dry air and it is determined that the set temperature of the inner space 21 is higher than the dew point temperature of the outer space 22 (NO in step S42), dry gas The control unit 76 stops the operation of the dry air unit (step S72). On the other hand, when the set temperature of the inner space 21 is below the dew point temperature of the outer space 22 (YES in step S42), the dry gas control unit 76 continues the operation of the dry air unit (step S52).

As described above, in this embodiment, the supply timing of dry air to the outer space 22 is adjusted in consideration of the dew point temperature of the outer space 22 . For this reason, it becomes possible to more accurately determine whether or not dehumidification in the outer space 22 is necessary, and then supply dry air to the outer space 22 at an appropriate timing.

Moreover, as a modification of this embodiment, based on the comparison result of the measured temperature (measured temperature of the inner temperature sensor 23) of the inner space 21, and the dew point temperature of the outer space 22, the outer space 22 On/off of supply of dry air to the furnace may be controlled. That is, after step S22 in FIG. 4 , the temperature of the inner space 21 is measured at all times or at predetermined time intervals, and whether the measured temperature of the inner space 21 in step S42 is equal to or lower than the dew point temperature of the outer space 22 . may be determined by the determination unit 73 . Then, when the measured temperature of the inner space 21 is equal to or less than the dew point temperature of the outer space 22 , the dry gas control unit 76 starts (or continues to operate) the dry air unit, and the measured temperature of the inner space 21 is When it is higher than the dew point temperature of the outer space 22 , the dry gas control unit 76 may stop (or continue to stop) the dry air unit.

(Embodiment 3)

Next, the structure of the radio wave shield chamber 3 which concerns on Embodiment 3 of this invention is demonstrated based on FIG. The radio wave shield chamber 3 according to the third embodiment has basically the same configuration as the radio wave shield chamber 1 according to the first and second embodiments and exhibits the same effects, but differs in that it circulates dry air. do. Hereinafter, only the points which differ from the said Embodiment 1 are demonstrated.

The dehumidifying unit 60 in the present embodiment is configured to circulate the dry air to the dry gas generating unit 61 through the drying gas discharge path 63 and to adjust the humidity of the dry air. Specifically, as shown in FIG. 5 , an end of the drying gas exhaust path 63 on the opposite side to the drying gas exhaust port 63A is connected to the inlet of the drying gas generator 61 . Thereby, the dry air circulates between the drying gas generating part 61 and the outer space 22 through the drying gas supply path 62 and the drying gas discharge path 63 .

In the dry gas generator 61 in this embodiment, a mechanism (for example, a cooling dehumidifier by a refrigerating device, a desiccant type dehumidifier, etc.) for removing moisture from dry air is incorporated. For this reason, the dry air which absorbed moisture in the outer space 22 is dehumidified in the dry gas generating part 61, and is supplied to the outer space 22 again. The moisture removal mechanism operates based on the measured value of the outside humidity sensor 26 and operates until the humidity of the outside space 22 becomes below a predetermined target humidity, and at the time when the humidity becomes below the target humidity. stop Moreover, when the humidity of the outer space 22 becomes higher than the predetermined target humidity, the moisture removal mechanism is operated. In the present embodiment, the humidity of the outer space 22 can be more reliably adjusted by circulating the dry air while adjusting the humidity of the dry air.

Moreover, the said water|moisture content removal mechanism may operate based on the dew point temperature calculated from the measured values of the outer side temperature sensor 25 and the outer side humidity sensor 26. As shown in FIG. In this case, the water removal mechanism operates until the calculated dew point temperature becomes below the predetermined target temperature and stops when the calculated dew point temperature becomes below the target temperature, and when the calculated dew point temperature becomes higher than the predetermined target temperature It works.

(Embodiment 4)

Next, the structure of the radio wave shield chamber 4 which concerns on Embodiment 4 of this invention is demonstrated based on FIG. The radio wave shield chamber 4 according to the fourth embodiment has basically the same configuration as the radio wave shield chamber 3 according to the third embodiment, but a gas guide plate 81 disposed in the outer space 22 is added. It is different in that it is provided with Hereinafter, only the points which differ from the said Embodiment 3 are demonstrated.

As shown in FIG. 6 , in the present embodiment, the drying gas supply path 62 and the drying gas discharge path 63 penetrate the same wall (wall 14 ) among the plurality of walls constituting the chamber 10 . and the drying gas supply port 62A and the drying gas discharge port 63A are adjacent to each other. The gas guide plate 81 is disposed in the outer space 22 so as to be positioned between the drying gas supply port 62A and the drying gas discharge port 63A.

The gas guide plate 81 forms a flow of dry air so that the dry air circulates around the outer space 22 . Specifically, as indicated by the arrow in FIG. 6 , the dry air supplied from the drying gas supply port 62A to the outer space 22 is the wall 14 , the upper wall 16 , and the wall ( 15), the outer space 22 flows in the order of the lower wall 17, and is sucked into the dry gas discharge path 63 from the drying gas discharge port 63A after that.

In addition, here, the flow of dry air in the outer space 22 in arbitrary cross sections (the cross section including the walls 14 and 15, the upper wall 16, and the lower wall 17) of the chamber 10 is controlled here. As explained, the gas guide plate 81 extends in the forward direction and inward direction of the paper in FIG. 6 . For this reason, the dry air supplied to the outer space 22 from the dry gas supply port 62A flows to the upper wall 16 side and along the gas guide plate 81 in the forward direction and the inside direction of the paper in FIG. 6 . also flows

As described above, in the fourth embodiment, even when the drying gas supply port 62A and the drying gas discharge port 63A are brought close to each other, the dry air can be spread over a wide range of the outer space 22 . For this reason, compared with the case where the drying gas supply port 62A and the drying gas discharge port 63A are mutually located on opposite sides, the duct length of the drying gas discharge path 63 can be made shorter. In addition, the gas guide plate 81 is preferably made of a material that can transmit radio waves.

(Embodiment 5)

Next, the structure of the radio wave shield chamber 5 which concerns on Embodiment 5 of this invention is demonstrated based on FIG. The radio wave shield chamber 5 according to the fifth embodiment has basically the same configuration as the radio wave shield chamber 1 according to the first and second embodiments, but further includes a heating unit 90 for heating dry air. It is different in that it is provided. Hereinafter, only the points which differ from the said Embodiment 1 are demonstrated.

The heating part 90 is comprised by a heater, for example. As shown in FIG. 7 , the heating unit 90 in the present embodiment is disposed in the drying gas supply path 62 . Thereby, the dry air generated by the dry air unit (dry gas generating unit 61 ) is heated by the heating unit 90 , and the dry air after the temperature rise is introduced into the outer space 22 . As a result, the outer space 22 and the first partition wall 30 are heated. That is, the heating part 90 in this embodiment heats the 1st partition wall 30 indirectly by heating the dry air supplied to the outer space 22. As shown in FIG.

The control unit 70 in the present embodiment further includes a heating control unit 77 that controls the heating unit 90 . The heating control unit 77 is one function of the CPU and controls the heater output of the heating unit 90 . The heating control part 77 in this embodiment controls the heating part 90 based on the set temperature-humidity of the inner space 21, and the temperature of the outer space 22. As shown in FIG. Moreover, the control part 70 has the calculating part 74. The calculating part 74 calculates the dew point temperature of the inner space 21 and the outer space 22 based on the temperature-humidity data of the inner space 21 and the outer space 22.

Next, the radio wave test method according to the present embodiment performed using the radio wave shield chamber 5 will be described with reference to the flowchart of FIG. 8 . In this radio wave test method, the state of transmission and reception of radio waves between the test object S1 and the antenna S2 is checked while the temperature of the inner space 21 is controlled and the first partition wall 30 is heated as follows. Evaluate.

First, similarly to the first embodiment, the test body S1 is installed in the inner space 21 and the antenna S2 is installed in the outer space 22 (step S13). Next, the temperature and humidity of the inner space 21 in the chamber 10 is set (step S23). In this embodiment, as an example, the set temperature of the inner space 21 is set to 85 degreeC, and the set humidity of the inner space 21 is set to 85 % (relative humidity).

Next, the temperature control unit 50 is operated (step S33). Although the temperature control of the inner space 21 is the same as that described in the said Embodiment 1, in this embodiment, the humidity of the inner space 21 is also adjusted as follows. Specifically, the humidity of the inner space 21 is measured by the inner humidity sensor 24 , and when the measured humidity is higher than the set humidity, the temperature control control unit 75 lowers the output of the humidifier. On the other hand, when the measured humidity of the inner space 21 is lower than the set humidity, the temperature control control unit 75 increases the output of the humidifier.

On the other hand, after step S23, the temperature of the outer space 22 is measured by the outer temperature sensor 25 at all times or at predetermined time intervals. And in step S43, the determination part 73 determines whether the measurement temperature of the outer space 22 is below the set dew point temperature of the inner space 21. Here, the set dew point temperature is what the calculating part 74 calculates based on the set temperature-humidity (85 degreeC, 85% in this embodiment) of the inner space 21, and is 83 degreeC in this embodiment, for example.

In this embodiment, immediately after the start of the test, the temperature of the outer space 22 is around normal temperature. For this reason, it is determined that the measured temperature of the outer space 22 is below the set dew point temperature of the inner space 21 (YES in step S43), the dry gas control part 76 starts operation of a dry air unit, and a heating control part 77 operates the heating unit 90 (step S53). Thereby, heated dry air is supplied to the outer space 22, and the temperature of the outer space 22 and the 1st partition wall 30 is raised.

Then, when a certain amount of time elapses from the start of the operation of the dry air unit and the operation of the heating unit 90 , the measured temperature of the outer space 22 rises, and the measured temperature becomes the set dew point temperature 83 of the inner space 21 . °C) (NO in step S43). In this case, the drying gas control unit 76 stops the operation of the dry air unit and the heating control unit 77 stops the heating unit 90 (step S73). Until the end condition of the test is satisfied, the determination by step S43 is repeated. Until the measured temperature of the outer space 22 exceeds the set dew point temperature of the inner space 21, the dry air unit The operation and operation of the heating unit 90 are continued.

As described above, in the present embodiment, the temperature of the first partition wall 30 can be raised by supplying heated dry air to the outer space 22 . For this reason, even if the inner space 21 in the chamber 10 is in a high temperature and high humidity state (for example, 85 degreeC, 85%), the inner surface temperature of the 1st partition wall 30 is below the dew point temperature of the inner space 21. can be prevented from becoming Thereby, it becomes possible to suppress generation|occurrence|production of the dew condensation water in the inner surface of the 1st partition wall 30, and to suppress the diffuse reflection of the radio wave by the dew condensation water in the chamber 10. As shown in FIG.

Here, the modified example of this embodiment is demonstrated.

<Modification 1>

In the present embodiment, the set dew point temperature is calculated based on the set temperature and humidity of the inner space 21 , and the dry air unit and the heating unit 90 are based on the comparison result of the set dew point temperature and the measured temperature of the outer space 22 . ), but control based on the measured temperature and humidity of the inner space 21 (measured values by the inner temperature sensor 23 and the inner humidity sensor 24) may be executed. Specifically, after step S23 in FIG. 8 , the temperature and humidity of the inner space 21 are measured at all times or at predetermined time intervals, and the actual dew point temperature of the inner space 21 is calculated by the calculating unit 74 based on the measured value. may be calculated. Then, in step S43, it is determined whether the measured temperature of the outer space 22 is equal to or less than the actual dew point temperature of the inner space 21, and the dry air unit and the heating unit 90 are controlled based on the determination result. You can do it.

<Modification 2>

In step S43 in FIG. 8 , it may be determined whether the measured temperature of the outer space 22 is equal to or lower than the measured temperature of the inner space 21 . Then, when the measured temperature of the outer space 22 is equal to or lower than the measured temperature of the inner space 21 , the dry air unit and the heating unit 90 are started (or continued to operate), and the measured temperature of the outer space 22 is When the temperature of the inner space 21 is higher than the measurement temperature, the operation of the dry air unit and the heating unit 90 may be stopped (or the operation stop may be continued). In addition, in the second modification, the set temperature of the inner space 21 may be used instead of the measured temperature of the inner space 21 .

<Other variations>

In step S53 in FIG. 8 , the heating unit 90 may be operated in a state in which the blowing function of the dry air unit is on and the dehumidifying function is OFF. In this case, the undehumidified air is heated by the heating unit 90 and supplied to the outer space 22 , and the outer space 22 and the first partition wall 30 are heated in the same manner.

Moreover, the heating part 90 may have a blowing function of air. In this case, in the same step S53, both the blowing function and the dehumidifying function of the dry air unit are turned off (operation stop), and the heating function and the blowing function of the heating unit 90 are turned on, so that the outer space 22 is You may supply heating air. Also in this case, the outer space 22 and the first partition wall 30 are heated in the same manner.

The heating part 90 is not limited to the case where it is arrange|positioned in the drying gas supply path 62, The heater incorporated in the dry air unit (dry gas generating part 61) may be sufficient. In addition, a bypass passage (not shown) having both ends connected to the drying gas supply passage 62 may be provided, and the heating unit 90 may be disposed in the bypass passage.

The heating unit 90 described in the present embodiment is also applicable to the radio wave shield chambers 3 and 4 according to the third and fourth embodiments.

(Embodiment 6)

Next, a radio wave shield chamber according to Embodiment 6 of the present invention will be described. The radio wave shield chamber according to the sixth embodiment has basically the same configuration as the radio wave shield chamber 5 according to the fifth embodiment, but the inner space 21 is set without using the measured temperature of the outer space 22 . It is different in that the dry air unit and the heating unit 90 are controlled based on the temperature and humidity. Hereinafter, only the points which differ from the said Embodiment 5 are demonstrated.

9 : has shown the control flow of the dry air unit and the heating part 90 in this embodiment. Steps S14 to S34 in FIG. 9 are the same as steps S13 to S33 in FIG. 8 .

In this embodiment, in step S44, the determination part 73 determines whether the set dew point temperature of the inner space 21 is more than a heating reference temperature. The set dew point temperature is calculated based on the temperature and humidity set in step S24. In addition, the heating reference temperature is a reference temperature for determining whether or not the supply of heated dry air is necessary, and is set to, for example, 30°C. This heating reference temperature data is stored in the storage unit 72 .

When the set dew point temperature of the inner space 21 is equal to or higher than the heating reference temperature (YES in step S44 ), the dry gas control unit 76 starts operation of the dry air unit and the heating control unit 77 controls the heating unit 90 . is operated (step S54). On the other hand, when the set dew point temperature of the inner space 21 is lower than a heating reference temperature (NO in step S44), let the dry air unit and the heating part 90 remain in a stopped state. Then, when the predetermined test termination condition is satisfied (YES in step S64), the radio wave test is finished.

On the other hand, when the test termination condition is not satisfied (NO in step S64), the determination returns to step S44. And when the set temperature and humidity of the inner space 21 is changed during the test, it is determined whether the set dew point temperature of the inner space 21 calculated based on the set temperature and humidity after the change is equal to or higher than the heating reference temperature. When the dry air unit and the heating unit 90 are in operation, if the set dew point temperature of the inner space 21 is equal to or higher than the heating reference temperature, the operation of the dry air unit and the heating unit 90 is continued, and on the other hand, the set dew point temperature is higher. When the temperature is lower than the heating reference temperature, the operation of the dry air unit and the heating unit 90 is stopped (step S74). In addition, when the dry air unit and the heating unit 90 are in operation stop and the set dew point temperature of the inner space 21 is equal to or higher than the heating reference temperature, the operation of the dry air unit and the heating unit 90 is started, and on the other hand, the operation of the dry air unit and the heating unit 90 is started. When the set dew point temperature is lower than the heating reference temperature, the dry air unit and the heating unit 90 are maintained in a stopped state.

<Modification 1>

FIG. 10 shows the control flow of the dry air unit and the heating unit 90 in Modification 1 of the sixth embodiment. The heating control unit 77 may control the heating unit 90 based on the measured temperature and humidity of the inner space 21 instead of the set temperature and humidity of the inner space 21 .

Steps S15 to S35 in FIG. 10 are the same as steps S14 to S34 in FIG. 9 . In this modified example, the temperature and humidity of the inner space 21 are measured at all times or at predetermined time intervals after step S25 , and based on the measurement result, the calculating unit 74 calculates the actual dew point temperature of the inner space 21 . do.

And in step S45, it is determined whether the actual dew point temperature of the inner space 21 is more than a heating reference temperature. When the actual dew point temperature of the inner space 21 is equal to or higher than the heating reference temperature (YES in step S45), the dry gas control unit 76 starts operating the dry air unit and the heating control unit 77 controls the heating unit 90 to operate (step S55). On the other hand, when the actual dew point temperature of the inner space 21 is lower than the heating reference temperature (NO in step S45), the dry air unit and the heating unit 90 are put into a stopped state (step S75).

In this modification, the determination in step S45 is repeated until the test end condition is satisfied. Then, while the actual dew point temperature of the inner space 21 is less than the heating reference temperature, the dry air unit and the heating unit 90 are in a stopped state, and while the heating reference temperature or more, the dry air unit and the heating unit 90 are operated. operate all the time.

<Modification 2>

In step S44 in FIG. 9 , it may be determined whether the measured temperature of the inner space 21 is equal to or greater than the heating reference temperature. Then, when the measured temperature of the inner space 21 is equal to or higher than the heating reference temperature, the dry air unit and the heating unit 90 are started (or continued to operate), and when the measured temperature of the inner space 21 is less than the heating reference temperature The operation of the dry air unit and the heating unit 90 may be stopped (or the operation stop may be continued). Further, in the second modification, the set temperature of the inner space 21 may be used instead of the measured temperature of the inner space 21 .

(Embodiment 7)

Next, a radio wave shield chamber according to Embodiment 7 of the present invention will be described. The radio wave shield chamber according to the seventh embodiment has basically the same configuration as the radio wave shield chamber 5 according to the fifth embodiment, but by the drying state for dehumidifying the outer space 22 and the heating unit 90 . It is different in that the dry air or the first partition wall 30 is further provided with a switching unit for switching the heating state in which it is heated. Hereinafter, only the points which differ from the said Embodiment 5 are demonstrated.

The switching unit switches the dry state and the heated state based on at least the measured temperature of the inner space 21 or at least the set temperature of the inner space 21, and specifically, the following patterns (1) to ( 6) each switching control is performed.

First, in the pattern (1), the switching unit switches the dry state and the heated state based on only the measured temperature of the inner space 21 . Specifically, when the measured temperature of the inner space 21 is equal to or higher than a predetermined reference temperature (for example, 25° C.), the switching unit operates the dry gas control unit 76 and the heating control unit so that the dry air unit and the heating unit 90 operate. A control signal is sent to each of (77). On the other hand, when the measured temperature of the inner space 21 is less than the reference temperature, the switching unit is each of the dry gas control unit 76 and the heating control unit 77 so that the dry air unit operates and the heating unit 90 stops. send a control signal to

In addition, the said reference temperature may have a predetermined range, for example, 15 degreeC or more and 35 degrees C or less. In this case, when the measured temperature of the inner space 21 is equal to or higher than the upper limit of the temperature range, it is switched to the heated state, and when the measured temperature of the inner space 21 is equal to or lower than the lower limit of the temperature range, it is in the dry state. is converted In addition, in the switching control of the pattern (1), instead of the measured temperature of the inner space 21, the set temperature of the inner space 21 may be used.

Next, in the pattern (2), the switching unit switches the dry state and the heated state based on the measured temperature and the measured humidity of the inner space 21 . Specifically, based on the measured temperature and the measured humidity of the inner space 21 , the calculating unit 74 calculates the dew point temperature of the inner space 21, and when the dew point temperature is equal to or higher than a predetermined reference temperature, dry air The switching unit sends a control signal to each of the drying gas control unit 76 and the heating control unit 77 so that the unit and the heating unit 90 operate. On the other hand, when the dew point temperature of the inner space 21 is less than the predetermined reference temperature, the switching unit is a dry gas control unit 76 and a heating control unit 77 so that the dry air unit operates and the heating unit 90 is stopped. sends a control signal to each of the In addition, in the switching control of the pattern (2), instead of the measured temperature-humidity of the inner space 21, the set temperature and humidity of the inner space 21 may be used.

Next, in the pattern (3), the switching unit switches the dry state and the heated state based on the measured temperature of the inner space 21 and the measured temperature of the outer space 22 . Specifically, when the measured temperature of the inner space 21 is higher than the measured temperature of the outer space 22 , the switching unit operates the dry gas control unit 76 and the heating control unit 77 so that the dry air unit and the heating unit 90 operate. ) to each of the control signals. On the other hand, when the measured temperature of the inner space 21 is lower than the measured temperature of the outer space 22 , the switching unit operates the dry gas control unit 76 and the heating unit so that the dry air unit operates and the heating unit 90 stops. A control signal is sent to each of the control units 77 . In addition, in the switching control of the pattern 3, the set temperature of the inner space 21 may be used instead of the measured temperature of the inner space 21. As shown in FIG.

Next, in the pattern (4), the switching unit switches the dry state and the heated state based on the measured temperature of the inner space 21, the measured humidity of the inner space 21, and the measured temperature of the outer space 22. do. Specifically, when the calculation unit 74 calculates the dew point temperature of the inner space 21 based on the measured temperature and the measured humidity of the inner space 21 , the dew point temperature is higher than the measured temperature of the outer space 22 . , the switching unit sends a control signal to each of the dry gas control unit 76 and the heating control unit 77 so that the dry air unit and the heating unit 90 operate. On the other hand, when the measured temperature of the inner space 21 is lower than the measured temperature of the outer space 22 , the switching unit operates the dry gas control unit 76 and the heating unit so that the dry air unit operates and the heating unit 90 stops. A control signal is sent to each of the control units 77 . In addition, in the switching control of the pattern 4, the set temperature and set humidity of the inner space 21 may be used instead of the measured temperature and the measured humidity of the inner space 21. In this case, based on the comparison of the set dew point temperature of the inner space 21 and the measured temperature of the outer space 22 calculated based on the said set temperature and humidity, a switching part switches the said dry state and the said heating state.

Next, in the pattern (5), the switching unit switches the dry state and the heated state based on the measured temperature of the inner space 21, the measured temperature of the outer space 22, and the measured humidity of the outer space 22. do. Specifically, when the measured temperature of the inner space 21 is higher than the measured temperature of the outer space 22 , the switching unit operates the dry gas control unit 76 and the heating control unit 77 so that the dry air unit and the heating unit 90 operate. ) to each of the control signals. On the other hand, based on the measured temperature and the measured humidity of the outer space 22 , the calculating unit 74 calculates the dew point temperature of the outer space 22 , and when the dew point temperature is higher than the measured temperature of the inner space 21 , dry The switching unit sends a control signal to each of the drying gas control unit 76 and the heating control unit 77 so that the air unit operates and the heating unit 90 is stopped. In addition, in the switching control of the pattern 5, instead of the measured temperature of the inner space 21, the set temperature of the inner space 21 may be used.

Finally, in the pattern (6), based on the measured temperature of the inner space 21, the measured humidity of the inner space 21, the measured temperature of the outer space 22, and the measured humidity of the outer space 22, the switching unit is The dry state and the heated state are switched. Specifically, when the calculation unit 74 calculates the dew point temperature of the inner space 21 based on the measured temperature and the measured humidity of the inner space 21 , the dew point temperature is higher than the measured temperature of the outer space 22 . , the switching unit sends a control signal to each of the dry gas control unit 76 and the heating control unit 77 so that the dry air unit and the heating unit 90 operate. On the other hand, based on the measured temperature and the measured humidity of the outer space 22 , the calculating unit 74 calculates the dew point temperature of the outer space 22 , and when the dew point temperature is higher than the measured temperature of the inner space 21 , dry The switching unit sends a control signal to each of the drying gas control unit 76 and the heating control unit 77 so that the air unit operates and the heating unit 90 is stopped. In addition, in the switching control of the pattern 6, the set temperature and set humidity of the inner space 21 may be used instead of the measured temperature and the measured humidity of the inner space 21. In this case, based on the comparison of the set dew point temperature of the inner space 21 and the measured temperature of the outer space 22 calculated based on the said set temperature and humidity, a switching part switches the said dry state and the said heating state.

In addition, in this embodiment, although the case where both the dry air unit and the heating part 90 are operated in the said heating state was demonstrated, in the said pattern (1) - (6), the dry air unit is stopped and The heating unit 90 may be operated. Specifically, as described in the modified example of the fifth embodiment, the outer space 22 and the first partition wall 30 may be heated using the heating function and the blowing function of the air by the heating unit 90 . . Moreover, you may operate the heating part 90 which directly heats the 1st partition wall 30 without passing through air.

(Embodiment 8)

Next, the structure of the radio wave shield chamber 7 which concerns on Embodiment 8 of this invention is demonstrated based on FIG. The radio wave shield chamber 7 according to the eighth embodiment has basically the same configuration as the radio wave shield chamber 5 according to the fifth embodiment, but a second partition wall 91 dividing the outer space 22 is added. It is different in that it is equipped with Hereinafter, only the points which differ from the said Embodiment 5 are demonstrated.

The second partition wall 91 divides the outer space 22 into a first outer space 22A surrounding the inner space 21 and a second outer space 22B in which the antenna S2 can be arranged. As shown in FIG. 11 , the drying gas supply port 62A and the drying gas discharge port 63A are open to the first outer space 22A. Accordingly, the dry air heated by the heating unit 90 is supplied to the first outer space 22A, but not to the second outer space 22B. Further, the second partition wall 91 is made of a material that can transmit radio waves.

According to the above configuration, the inner space 21 is in a state of high temperature and high humidity, and the first outer space ( Even when heated dry air is supplied to 22A), the temperature of the second outer space 22B can be maintained lower than the temperature of the first outer space 22A. Accordingly, when the antenna S2 having low heat resistance is disposed in the second outer space 22B, thermal damage to the antenna S2 can be suppressed. In addition, the 2nd partition wall 91 demonstrated in this embodiment is applicable also in the said Embodiment 1-7.

(Embodiment 9)

Next, the radio wave shield chamber 9 concerning Embodiment 9 of this invention is demonstrated based on FIG. The radio wave shield chamber 9 according to the ninth embodiment is basically the same as the radio wave shield chamber 5 according to the fifth and sixth embodiments, but does not include the drying gas generator 61 and the heating gas circulates. It is different in that it is composed.

The heating unit 90 includes a ventilation mechanism such as a fan and a heating mechanism such as a heater that heats a gas (for example, air) sent from the ventilation mechanism. The heating control unit 77 controls the operation of the ventilation mechanism and the heating mechanism, respectively.

The radio wave shield chamber 9 includes a heating gas supply path 92 for supplying heating gas from the heating unit 90 to the outer space 22 , and a heating unit 90 for heating gas discharged from the outer space 22 . A heating gas discharge path 93 for returning to the furnace is provided. As shown in FIG. 12 , the heating gas supply path 92 extends through the heat insulating material 13 , the outer box 11 , and the inner box 12 to the outer space 22 , and extends from the supply port 92A to the outside. A heating gas is supplied to the space 22 . On the other hand, the heating gas discharge path 93 also extends to the outer space 22 through the heat insulating material 13, the outer box 11, and the inner box 12, and the heating gas in the outer space 22 is discharged through the outlet 93A. It is discharged from the heating gas discharge path (93).

With the above configuration, the heating gas circulates between the heating unit 90 and the outer space 22 through the heating gas supply path 92 and the heating gas discharge path 93 . And the outer space 22 and the 1st partition wall 30 are heated by the heating gas.

The heating part 90 in this embodiment is basically controlled by the same flow as FIGS. 8-10. That is, in steps S53, S54, and S55 of FIGS. 8 to 10, the fan and heater of the heating unit 90 are operated, respectively, and in steps S73, S74, and S75 of the same figure, the fan and heater of the heating unit 90 stop each.

<Modified example>

Although the case of circulating a heating gas was demonstrated in Embodiment 9, the heating gas discharged|emitted from the outer space 22 may be discharge|released to air|atmosphere. That is, the end of the heating gas discharge path 93 on the side opposite to the discharge port 93A may be open to the atmosphere.

The heating unit 90 is not limited to indirectly heating the first partition wall 30 and the outer space 22 by heating the gas supplied to the outer space 22 . A heater for direct heating may be used.

As a control pattern of the heating part 90, the following modification is mentioned.

In step S43 in FIG. 8 , it may be determined whether the measured temperature of the inner space 21 is equal to or greater than a predetermined reference temperature. Then, when the measured temperature of the inner space 21 is equal to or higher than the reference temperature, the operation of the fan and the heater of the heating unit 90 is started (or the operation is continued), and when the measured temperature of the inner space 21 is less than the reference temperature The operation of the fan and the heater of the heating unit 90 may be stopped (or the operation may be continued). At this time, the set temperature of the inner space 21 may be used instead of the measured temperature of the inner space 21 .

In step S43 in FIG. 8 , it may be determined whether the set dew point temperature of the inner space 21 is equal to or greater than a predetermined reference temperature. Then, when the set dew point temperature of the inner space 21 is equal to or higher than the reference temperature, the operation of the fan and the heater of the heating unit 90 is started (or the operation is continued), and the set dew point temperature of the inner space 21 is the reference temperature When it is less than, the operation of the fan and the heater of the heating part 90 may be stopped (or operation stop may be continued). At this time, instead of the set dew point temperature of the inner space 21, the actual dew point temperature of the inner space 21 calculated based on the measured temperature and the measured humidity of the inner space 21 may be used.

In step S43 in FIG. 8 , it may be determined whether the measured temperature of the inner space 21 is equal to or greater than the measured temperature of the outer space 22 . Then, when the measured temperature of the inner space 21 is equal to or higher than the measured temperature of the outer space 22, the operation of the fan and the heater of the heating unit 90 is started (or the operation is continued), and the measured temperature of the inner space 21 is When the temperature of the outer space 22 is less than the measured temperature, the operation of the fan and the heater of the heating unit 90 may be stopped (or the operation may be continued). At this time, the set temperature of the inner space 21 may be used instead of the measured temperature of the inner space 21 .

In step S43 in FIG. 8 , it may be determined whether the set dew point temperature of the inner space 21 is equal to or greater than the measurement temperature of the outer space 22 . Then, when the set dew point temperature of the inner space 21 is equal to or higher than the measured temperature of the outer space 22 , the fan and the heater of the heating unit 90 are started (or continued to operate), and the set dew point of the inner space 21 is When the temperature is lower than the measured temperature of the outer space 22 , the operation of the fan and the heater of the heating unit 90 may be stopped (or the operation may be continued). At this time, instead of the set dew point temperature of the inner space 21, the actual dew point temperature of the inner space 21 calculated based on the measured temperature and the measured humidity of the inner space 21 may be used.

The second partition wall 91 described in the eighth embodiment is also applicable to the radio wave shield chamber 9 according to the ninth embodiment.

(Other embodiments)

Here, other embodiments of the present invention will be described.

As another example of the dehumidifying unit in the present invention, a desiccant such as silica gel disposed in the outer space 22 is exemplified. Moreover, although dry air was demonstrated as an example of a drying gas in the said embodiment, it is also possible to use other types of drying gas, such as an inert gas, for example.

In the radio wave shield chamber according to each of the above embodiments, the radio wave absorber 40 may be omitted. In addition, whether or not the radio wave absorber 40 is disposed in the chamber 10 may be determined according to the type of test conducted using the radio wave shield chamber.

The radio wave shield chamber of the present invention includes not only a relatively small one for conducting radio wave testing such as a smartphone, but also a large one (radio shield room) capable of accommodating a vehicle in which a communication module is mounted.

The dew point temperature of the inner space 21 and the outer space 22 is not limited to the case where it is calculated by calculation based on the measured temperature and humidity or the set temperature and humidity, and may be directly detected using a dew point meter.

In addition, when the said embodiment is outlined, it will be as follows.

The radio wave shield chamber according to the above embodiment is a first partition wall that divides the chamber and a space in the chamber into an inner space in which a test object is disposed and an outer space surrounding the inner space, wherein the first partition capable of transmitting radio waves A wall, a temperature control unit for temperature-regulating the inner space, and a dehumidifying unit for dehumidifying the outer space are provided.

According to this radio wave shield chamber, the humidity of the outer space in a chamber can be lowered|hung by a dehumidifying part. For this reason, even if the outer surface temperature of a 1st partition wall falls by temperature-regulating the inner space in a chamber to low temperature by a temperature control unit, it can suppress that the said outer surface temperature becomes below the dew point temperature of an outer space. Thereby, generation|occurrence|production of the dew condensation water in the outer surface of a 1st partition wall is suppressed, and it becomes possible to suppress the diffuse reflection of the radio wave by the dew condensation water in a chamber.

In the radio wave shield chamber, the dehumidifying unit includes a drying gas generating unit disposed outside the chamber, and a drying gas supply path having a drying gas supply port for supplying the drying gas generated by the drying gas generating unit to the outer space. you may be doing

According to this configuration, it is possible to easily dehumidify the outer space using the dry gas. In addition, when the radio wave absorber is disposed in the outer space, it is possible to suppress performance degradation of the radio wave absorber due to a high humidity environment or dew water.

The radio wave shield chamber may further include a drying gas control unit that controls the drying gas generator based on a set temperature of the inner space or a measured temperature of the inner space.

According to this configuration, when the set temperature or the measured temperature of the inner space is low and the outer surface temperature of the first partition wall is likely to decrease, the drying gas is supplied to the outer space, so that the water dew condensation on the outer surface of the first partition wall is supplied. generation can be more reliably suppressed. Moreover, when the set temperature of inner space or its measurement temperature is high, energy saving can also be achieved by stopping supply of the drying gas to outer space.

The radio wave shield chamber includes a drying gas control unit configured to control the drying gas generator to supply the drying gas to the outer space when the set temperature of the inner space or the measured temperature of the inner space is less than or equal to the dew point temperature of the outer space. You may provide additionally.

According to this structure, since the supply timing of the drying gas to the outer space is adjusted in consideration also of the dew point temperature of the outer space, it is possible to suppress generation|occurrence|production of dew condensation water more reliably.

In the radio wave shield chamber, the dehumidifier may further include a drying gas discharge path for discharging the drying gas from the outer space to the outside of the chamber. The drying gas discharge path may be provided with a drying gas discharge port opened to the outer space and a drying gas discharge port opened to the outer space of the chamber.

According to this structure, since the drying gas can be discharged|released to the outer space of a chamber, compared with the structure which circulates a drying gas, an installation is simplified, and cost reduction can be aimed at.

In the radio wave shield chamber, the dehumidifier may further include a drying gas discharge path for discharging the drying gas from the outer space to the outside of the chamber. The said dehumidifying part may be comprised so that the said drying gas may be circulated to the said drying gas generating part via the said drying gas discharge path.

According to this structure, it becomes possible to adjust the humidity of an outer space more reliably by circulating a drying gas.

The radio wave shield chamber may further include a gas guide plate that forms a flow of the drying gas so that the drying gas goes around the outer space.

According to this configuration, even when the drying gas supply port and the drying gas discharge port are brought close to each other, the drying gas can be spread widely over a wide range of the outer space. And by making the drying gas supply port and the drying gas discharge port close to each other, when a circulation type dehumidifying part is used, the duct length of a drying gas supply path and a dry gas discharge path can be suppressed.

The radio wave shield chamber may further include a shield member that is attached to the drying gas supply port and that allows the drying gas to pass through and reflects radio waves.

According to this structure, while drying gas can be supplied to the outer space from a drying gas supply port, it can suppress that an electric wave leaks out of a chamber through a drying gas supply port.

The radio wave shield chamber may further include a heating unit for heating the dry gas or the first partition wall.

According to this configuration, the temperature of the first partition wall can be raised by supplying the heated dry gas to the outer space or by heating the first partition wall. Thereby, even if the inner space is in a high-temperature, high-humidity state, generation|occurrence|production of the dew condensation water in the inner surface of a 1st partition wall can be suppressed.

The radio wave shield chamber may further include a heating control unit that controls the heating unit based on at least a set temperature of the inner space or at least a measured temperature of the inner space and a measured temperature of the outer space.

According to this configuration, the timing of heating the drying gas can be adjusted in consideration of the measured temperature of the outer space and at least the set temperature or at least the measured temperature of the inner space, so even if the inner space is in a high temperature and high humidity state, the first partition wall It becomes possible to suppress generation|occurrence|production of the dew condensation water in the inner surface more reliably.

The radio wave shield chamber may further include a heating control unit that controls the heating unit based on at least a set temperature of the inner space or at least a measured temperature of the inner space.

According to this structure, compared with the case where heating of dry gas is controlled in consideration of both the temperature of the outer space and at least the set temperature or at least the measured temperature of the inner space, heating control can be further simplified.

The radio wave shield chamber includes a dry state for dehumidifying the outer space based on at least the measured temperature of the inner space or at least a set temperature of the inner space, and the drying gas or the first partition wall by the heating unit. You may further provide the switching part which switches the heating state to be heated.

According to this structure, it becomes possible to perform dehumidification and heating in a chamber efficiently so that generation|occurrence|production of the dew condensation water in both the inner surface and outer surface of a 1st partition wall can be suppressed.

The radio wave shield chamber according to the above embodiment is a first partition wall that divides the chamber and a space in the chamber into an inner space in which a test object is disposed and an outer space surrounding the inner space, wherein the first partition capable of transmitting radio waves It is provided with a wall, a temperature control unit which temperature-controls the said inner space, and the heating part which heats the said 1st partition wall.

According to this radio wave shield chamber, the temperature of the 1st partition wall can be raised by a heating part. For this reason, even if the inner space in a chamber is a state of high temperature, high humidity, it can suppress that the inner surface temperature of a 1st partition wall becomes below the dew point temperature of inner space. Thereby, it becomes possible to suppress generation|occurrence|production of the dew condensation water in the inner surface of a 1st partition wall, and to suppress the diffuse reflection of the radio wave by the dew condensation water in a chamber.

The radio wave shield chamber further includes a second partition wall dividing the outer space into a first outer space surrounding the inner space and a second outer space in which an antenna for transmitting and receiving radio waves between the test object and the antenna can be disposed. You may be equipped. The second partition wall may be configured to transmit radio waves.

According to this configuration, even when the inner space is in a high temperature and high humidity state and the temperature of the first outer space is raised in order to suppress dew condensation on the inner surface of the first partition wall, the temperature of the second outer space is changed to the first outer space. can be kept below the temperature of Thereby, when an antenna with low heat resistance is disposed in the outer space, it is possible to suppress thermal damage of the antenna.

In the radio wave test method according to the above embodiment, at least the test object among the antennas for transmitting and receiving radio waves between the test object and the test object is in a chamber an inner space divided by a first partition wall and an outer side surrounding the inner space. It includes installing in the inner space of the space, controlling the temperature of the inner space and dehumidifying the outer space while evaluating the transmission/reception state of radio waves between the test object and the antenna.

In this method, while temperature-controlling the inner space in the chamber and dehumidifying the outer space, the state of transmission/reception of radio waves between the test object and the antenna is evaluated. For this reason, even if the outer surface temperature of a 1st partition wall falls by temperature-controlling the inner space to low temperature according to test conditions, it can suppress that the said outer surface temperature becomes below the dew point temperature of an outer space. Thereby, generation|occurrence|production of the dew condensation water in the outer surface of a 1st partition wall can be suppressed, and the diffuse reflection of the radio wave by the dew condensation water in a chamber can be suppressed.

In the radio wave test method according to the above embodiment, at least the test object among the antennas for transmitting and receiving radio waves between the test object and the test object is in a chamber an inner space divided by a first partition wall and an outer side surrounding the inner space. It includes installing in the inner space of the space, and evaluating the transmission/reception state of radio waves between the test object and the antenna while controlling the temperature of the inner space and heating the first partition wall.

In this method, while the temperature inside the chamber is controlled and the first partition wall is heated, the transmission/reception state of radio waves between the test object and the antenna is evaluated. For this reason, even when testing in the state which made inner space high temperature, high humidity, it can suppress that the inner surface temperature of a 1st partition wall becomes below the dew point temperature of inner space. Thereby, it becomes possible to suppress generation|occurrence|production of the dew condensation water in the inner surface of a 1st partition wall, and to suppress the diffuse reflection of the radio wave by the dew condensation water in a chamber.

It should be understood that embodiment disclosed this time is an illustration in every point, and is not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and scope equivalent to the claims are included.

Claims (16)

chamber and
a first partition wall dividing the space in the chamber into an inner space where the test object is disposed and an outer space surrounding the inner space, the first partition wall capable of transmitting radio waves;
a temperature control unit for controlling the temperature of the inner space;
A radio wave shield chamber provided with a dehumidifying unit for dehumidifying the outer space. The method according to claim 1,
The dehumidifying unit includes a drying gas generating unit disposed outside the chamber, and a drying gas supply path formed with a drying gas supply port for supplying the drying gas generated by the drying gas generating unit to the outer space. 3. The method according to claim 2,
The radio wave shield chamber further comprising a drying gas control unit for controlling the drying gas generator based on the set temperature of the inner space or the measured temperature of the inner space. 3. The method according to claim 2,
When the set temperature of the inner space or the measured temperature of the inner space is equal to or less than the dew point temperature of the outer space, a drying gas control unit further comprising a drying gas control unit for controlling the drying gas generating unit to supply the drying gas to the outer space, shield chamber. 5. The method according to any one of claims 2 to 4,
The dehumidifying unit further includes a drying gas discharge path for discharging the drying gas from the outer space to the outside of the chamber,
and a drying gas outlet opening to the outer space and a drying gas outlet opening to an outer space of the chamber are formed in the drying gas outlet path. 5. The method according to any one of claims 2 to 4,
The dehumidifying unit further includes a drying gas discharge path for discharging the drying gas from the outer space to the outside of the chamber,
The dehumidifying unit is configured to circulate the drying gas to the drying gas generating unit through the drying gas discharge path. 5. The method according to any one of claims 2 to 4,
and a gas guide plate that forms a flow of the drying gas so that the drying gas revolves around the outer space. 5. The method according to any one of claims 2 to 4,
The radio wave shield chamber, which is mounted on the drying gas supply port and further includes a shield member that allows the drying gas to pass through and reflects radio waves. 5. The method according to any one of claims 1 to 4,
The radio wave shield chamber further comprising a heating unit for heating the drying gas or the first partition wall. 10. The method of claim 9,
The radio wave shield chamber further comprising: a heating control unit configured to control the heating unit based on at least a set temperature of the inner space or at least a measured temperature of the inner space and a measured temperature of the outer space. 10. The method of claim 9,
The radio wave shield chamber further comprising a heating control unit for controlling the heating unit based on at least a set temperature of the inner space or at least a measured temperature of the inner space. 10. The method of claim 9,
Based on at least the measured temperature of the inner space or at least the set temperature of the inner space, a dry state in which the outer space is dehumidified and a heating state in which the dry gas or the first partition wall is heated by the heating unit are switched A radio wave shield chamber additionally provided with a switching unit. chamber and
a first partition wall dividing the space in the chamber into an inner space where the test object is disposed and an outer space surrounding the inner space, the first partition wall capable of transmitting radio waves;
a temperature control unit for controlling the temperature of the inner space;
A radio wave shield chamber provided with a heating unit for heating the first partition wall. 14. The method according to any one of claims 1 to 4 or 13,
Further comprising a second partition wall dividing the outer space into a first outer space surrounding the inner space and a second outer space in which an antenna for transmitting and receiving radio waves between the test object and the antenna can be disposed,
The second partition wall is configured to transmit radio waves. Installing at least the test object among the antennas for transmitting and receiving radio waves between the test object and the test object in the inner space of the inner space divided by the first partition wall and the outer space surrounding the inner space in the chamber;
A radio wave test method comprising evaluating a transmission/reception state of radio waves between the test object and the antenna while temperature controlling the inner space and dehumidifying the outer space. Installing at least the test object among the antennas for transmitting and receiving radio waves between the test object and the test object in the inner space of the inner space divided by the first partition wall and the outer space surrounding the inner space in the chamber;
A radio wave test method comprising evaluating a transmission/reception state of radio waves between the test object and the antenna while heating the first partition wall while controlling the temperature of the inner space.

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