JP2023007899A - Radio wave black box, and test device using the radio wave black box - Google Patents

Abstract

To provide a radio wave black box that is easily carryable with the black box divided, and can be assembled at a carriage destination.SOLUTION: A radio wave black box for measuring a transmission/reception characteristic of a radio terminal comprises: a first to third chamber parts 300, 400 and 500; and connection shafts 310 that each connect adjacent two of the chamber parts.The respective chamber parts each comprise a frame, and metal outer plates fixed to the frame, and are mutually connected to constitute a box-shaped body. The frame provided in the first chamber part includes columnar connection frames 301A that extend over an entire width of the first chamber part horizontally in a connection direction, and are formed with through-holes in a longitudinal direction. The connection shaft 310 is inserted into the through-holes of the connection frame, with one end part of the connection shaft removably fixed to the second chamber part 400 at one end of the connection frame, meanwhile, the end of the connection shaft removably fixed to the other end of the connection frame and the outer plate of the first chamber part.SELECTED DRAWING: Figure 7

Description

The present invention relates to an anechoic box and a test apparatus using the anechoic box.

2. Description of the Related Art In recent years, with the development of multimedia, wireless terminals (smartphones, etc.) equipped with antennas for wireless communication such as cellular and wireless LAN have been actively produced. In the future, wireless terminals that transmit and receive wireless signals compatible with IEEE 802.11ad, 5G cellular, and the like, which use broadband signals in the millimeter wave band, will be especially required.

A wireless terminal design and development company or its manufacturing factory measures the output level and reception sensitivity of the transmission radio waves specified for each communication standard for the wireless communication antenna provided in the wireless terminal, and measures these RF (Radio A performance test is performed to determine whether the frequency characteristics meet predetermined criteria. In the performance test, RRM (Radio Resource Management) characteristics are also measured. Measurement of RRM characteristics is performed to confirm whether or not radio resource control between a base station and a radio terminal, such as handover between adjacent base stations, operates correctly.

With the generation shift from 4G or 4G Advanced to 5G, the test method for the performance test described above is also changing. For example, in a performance test using a wireless terminal for a 5G NR (New Radio) system as a device under test (DUT), the antenna terminal and test equipment of the DUT, which were the mainstream in tests such as 4G and 4G advanced, In the method of connecting by wire, the characteristics deteriorate due to attaching an antenna terminal to the high frequency circuit, or the number of elements of the array antenna is large, and it is not realistic to attach an antenna terminal to all elements in terms of space and cost. cannot be used for some reason. For this reason, the DUT is housed together with the test antenna in an anechoic box that is not affected by the surrounding radio wave environment. A so-called OTA (Over The Air) test, in which reception by an antenna is performed by wireless communication, is being conducted (see, for example, Patent Document 1).

In OTA testing, a test antenna placed in an anechoic box creates a quiet zone, for example a spherical shape, and the DUT is placed in the quiet zone. Here, the quiet zone is a concept that represents the range of a spatial region in which the DUT is irradiated with radio waves of substantially uniform amplitude and phase from the test antenna in the anechoic box that constitutes the OTA test environment (for example, non-patented Reference 1). By arranging the DUT in such a quiet zone, it becomes possible to perform an OTA test while suppressing the influence of scattered waves from the surroundings.

JP 2020-085784 A

3GPP TR 38.810

In the test apparatus described in Patent Document 1, a plurality of test antennas capable of transmitting and receiving with the antenna under test of the DUT are provided in an anechoic box to measure the transmission and reception characteristics of the DUT. Far field measurement (FFM (Far Field Measurement)) is generally performed in the measurement of transmission/reception characteristics. In the test apparatus described in Patent Document 1, a reflector having a paraboloidal reflecting surface of revolution is provided. is reflected toward the test antenna. In order to perform indirect far-field measurement using a relatively large reflector, a relatively large anechoic box having a width of 2.2 m, a depth of 1.2 m, and a height of 2.0 m, for example, was required.

In the case of such a large anechoic box, the maximum volume that can be loaded on a transportation machine is limited when transporting it from a manufacturing plant to a delivery site in the finished product state, especially when transporting it to a foreign country. In addition, there is a problem that transportation costs become high when the volume is large. In order to avoid this, even if parts are brought in and assembled on site, there are many attachment points using screws or the like, and the assembly work takes time and effort, and is not easy.

The present invention has been made to solve such conventional problems, and an anechoic box that can be easily divided and transported and can be easily assembled at the destination, and a test using the same. The purpose is to provide an apparatus.

In order to solve the above problems, an anechoic box according to the present invention is an anechoic box (50) used for measuring transmission or reception characteristics of a wireless terminal, comprising metal frames (301, 401, 501) and A plurality of chambers (300, 400, 500) comprising metal planar portions (302, 402, 502) fixed to the frame, and connected to each other to form a box-shaped body surrounded by the planar portions. ) and a connecting shaft (310) connecting a first chamber portion (300) and a second chamber portion (400) adjacent among the plurality of chamber portions, wherein the first chamber portion is The frame includes a columnar connection frame (301A) extending horizontally in the connection direction across the entire width of the first chamber portion and having a through hole (301d) formed in the longitudinal direction, and the connection shaft is inserted through the through hole of the connecting frame, one end of the connecting shaft (310a) is detachably fixed to the second chamber part at one end of the connecting frame, and the other end of the connecting shaft The part (310b) is detachably fixed to the other end of the connecting frame.

As described above, the anechoic box according to the present invention forms a box-shaped body in which a plurality of chamber sections are connected by a connecting shaft and surrounded by a metal planar section. As a result, even a large anechoic box can be divided and easily transported.

Further, in the anechoic box according to the present invention, the connecting shaft is inserted through the through hole of the connecting frame provided in the adjacent first chamber portion, and one end of the connecting shaft is inserted into the adjacent second chamber portion at one end of the connecting frame. It is detachably fixed to the chamber part, and the other end of the connecting shaft is detachably fixed to the other end of the connecting frame. By fixing one end and the other end of the connecting shaft to the adjacent first and second chambers, respectively, the anechoic box can be easily assembled. In addition, since the connecting shaft is guided through the through-hole of the connecting frame, the movement of the connecting shaft is restricted, and the connecting shaft can be easily attached. By releasing the fixation of both ends of the connecting shaft, the anechoic box can be easily divided.

Moreover, since the connecting shaft is fixed by being inserted through the through hole of the connecting frame that extends horizontally in the left and right connecting direction over the entire width of the first chamber part, it is not necessary to go behind the anechoic box when assembling and dividing. In addition, even if there is a wall or the like in the back and workers cannot enter, it is possible to easily assemble and divide from the left and right.

Therefore, the anechoic box according to the present invention can be easily divided and transported, and can be easily assembled at the transport destination.

Further, in the anechoic box according to the present invention, the frame provided in the second chamber section includes a columnar support frame (401A) having a fixture (420) that is slidable in the longitudinal direction, The one end portion may be fixed to the fixture of the strut frame in a non-slidable state in the longitudinal direction.

With this configuration, in the anechoic box according to the present invention, one end of the connecting shaft is fixed to the fixture of the support frame having relatively strong strength provided in the adjacent second chamber section, so that it can be firmly fixed. can. In addition, since the fixture is slidable before the one end of the connecting shaft is fixed to the fixture, the positions of the one end of the connecting shaft and the fixture can be easily adjusted.

Further, in the anechoic box according to the present invention, the frames included in the plurality of chambers have through holes formed in the longitudinal direction through which the connecting shafts can be inserted, and the fixtures are slidably accommodated in the side portions. A configuration having the same cross-sectional shape with possible grooves is also possible.

With this configuration, the anechoic box according to the present invention can be used by cutting the same type of frame having the same cross section into a required length, so that the manufacturing cost can be reduced.

Further, in the anechoic box according to the present invention, the other end of the connecting shaft may be detachably fixed to the planar portion of the first chamber together with the other end of the connecting frame. .

With this configuration, in the electromagnetic wave anechoic box according to the present invention, the other end of the connecting shaft is detachably fixed not only to the other end of the connecting frame but also to the planar portion such as the exterior plate, so that the assembly work can be efficiently performed. It can be carried out.

Further, the anechoic box according to the present invention further includes another connecting shaft (510) connecting the second chamber portion and the third chamber portion (500) adjacent among the plurality of chamber portions, The frame provided in the third chamber part includes a columnar connection frame (501A) extending horizontally in the direction of the connection over the entire width of the third chamber part and having a through hole formed in the longitudinal direction, The separate connecting shaft is inserted through the through hole of the connecting frame of the third chamber, and one end of the separate connecting shaft attaches to and detaches from the second chamber at one end of the connecting frame. It may be freely fixed, and the other end of the separate connection shaft may be detachably fixed to the other end of the connection frame.

With this configuration, even if the anechoic box according to the present invention is large, it can be easily divided into three parts for transportation, and can be easily assembled at the transportation destination.

Further, in the anechoic box according to the present invention, a positioning pin (430) is provided on the frame included in one of two adjacent chambers among the plurality of chambers, and the other corresponding chamber is provided with The frame may be provided with a pin receiving portion (532) having a guide hole for guiding and fitting the positioning pin.

With this configuration, the anechoic box according to the present invention can easily and accurately position the two connected chamber parts. Further, since the positioning pins and the pin receiving portion are attached to the relatively strong frame in the anechoic box, the opposing chamber portion can be supported by the positioning pin or the pin receiving portion during positioning.

Further, the test apparatus according to the present invention is a test apparatus (1) for measuring transmission characteristics or reception characteristics of a device under test (100) having an antenna under test (110). Any one of the above anechoic boxes having a space (51), one or more test antennas (6) for transmitting or receiving radio signals between the antenna under test, and a quiet zone in the internal space a posture varying mechanism (56) for sequentially changing the posture of the test subject placed in the inner space (QZ); and a measuring device (2) that selectively uses one or a plurality of test antennas among the antennas to measure transmission characteristics or reception characteristics of the object under test.

With this configuration, the test apparatus according to the present invention can measure the orientation dependence of the transmission characteristics or reception characteristics of the test object. Also, the RF characteristics and RMM characteristics of the object under test can be measured.

A method of assembling an anechoic box according to the present invention is a method of assembling an anechoic box (50) used for measuring transmission or reception characteristics of a wireless terminal, comprising metal frames (301, 401, 501) and A plurality of chambers (300, 400, 500) comprising metal planar portions (302, 402, 502) fixed to the frame, and connected to each other to form a box-shaped body surrounded by the planar portions. ) and a connecting shaft (310) connecting the adjacent first chamber portion (300) and the second chamber portion (400) among the plurality of chamber portions, The frame provided in the chamber part (300) is a columnar connection frame (301A) extending horizontally in the direction of the connection over the entire width of the first chamber part and having a through hole (301d) formed in the longitudinal direction. one end (310a) of the connecting shaft is detachably fixed to the adjacent second chamber part (400), and the connecting shaft is inserted through the through hole of the connecting frame. and detachably fixing the other end (310b) of the connecting shaft to the other end of the connecting frame and the planar portion of the first chamber.

With this configuration, in the method of assembling the electromagnetic wave anechoic box according to the present invention, both ends of the connecting shaft can be fixed to the two chamber parts respectively by working from the side side, so that the electromagnetic waves can be The dark box can be assembled easily. Furthermore, work can be done even if there is no space behind the anechoic box, so the work space can be saved.

According to the present invention, it is possible to provide an anechoic box which can be easily divided and transported, and which can be easily assembled at the destination, and a test apparatus using the same.

It is a figure showing a schematic structure of the whole test device concerning an embodiment of the present invention. 1 is a block diagram showing the functional configuration of a test device according to an embodiment of the present invention; FIG. 3 is a block diagram showing the functional configuration of the integrated control device of the test apparatus according to the embodiment of the present invention; FIG. 3 is a block diagram showing the functional configuration of the NR system simulator of the test device according to the embodiment of the present invention; FIG. 1 is a perspective view of an anechoic box according to an embodiment of the present invention; FIG. 6 is a front view showing a state in which the anechoic box of FIG. 5 is separated by removing the door. FIG. FIG. 6 is an exploded perspective view of the anechoic box of FIG. 5; FIG. 4 is a schematic diagram showing how to connect the divided chambers. 2 is a cross-sectional view taken along line IX-IX of the anechoic box of FIG. 1; FIG. FIG. 8 is a partially enlarged view of FIG. 7 showing a method of alignment using positioning pins; FIG. 8 is a partially enlarged view of FIG. 7 showing how the connecting shaft is secured; FIG. 8 is a partially enlarged view of FIG. 7 showing how the ends of the connecting shaft are screwed; FIG. 8 is a partial enlarged view of FIG. 7 showing how the cradles are connected; 4 is a flow chart showing an outline of an assembling method of the anechoic box according to the embodiment of the present invention;

A test apparatus using an anechoic box according to an embodiment of the present invention will be described below with reference to the drawings. Note that the dimensional ratio of each component on each drawing does not necessarily match the actual dimensional ratio.

The test apparatus 1 according to this embodiment measures transmission characteristics or reception characteristics of a DUT 100 having an antenna 110, and measures RF characteristics and RRM characteristics of the DUT 100, for example. For this purpose, the test apparatus 1 includes an anechoic box (also referred to as an OTA chamber) 50 and a plurality of test antennas 6a, 6b, 6c, 6d, 6e, and 6f (hereinafter also collectively referred to as test antennas 6). , an attitude varying mechanism 56 , an integrated control device 10 , an NR system simulator 20 , a signal processing section 40 and a signal switching section 41 . The integrated control device 10, the NR system simulator 20, the signal processing section 40, and the signal switching section 41 of this embodiment correspond to the measuring device 2 of the present invention.

FIG. 1 shows the external structure of a test device 1, and FIG. 2 shows functional blocks of the test device 1. As shown in FIG. However, FIG. 1 shows the layout of each component in a state in which the anechoic box 50 is seen through from the front.

As shown in FIGS. 1 and 2, the anechoic box 50 has an internal space 51 that is not affected by the surrounding radio wave environment. The test antenna 6 and the reflector 7 are installed in the inner space 51 of the anechoic box 50, and transmit or receive radio signals to and from the antenna 110 for measuring the transmission characteristics or reception characteristics of the DUT 100. . The posture varying mechanism 56 changes the posture of the DUT 100 placed within the quiet zone QZ in the internal space 51 of the anechoic box 50 . The integrated control device 10, the NR system simulator 20, the signal processing unit 40, and the signal switching unit 41 use one or two test antennas 6 for the DUT 100 whose posture has been changed by the posture changing mechanism 56, so that the DUT 100 It is designed to measure transmission characteristics or reception characteristics. Each component will be described below.

(anechoic box)
The anechoic box 50 is used to measure the transmission or reception characteristics of a wireless terminal, and realizes an OTA test environment for performance testing of, for example, a 5G wireless terminal. The anechoic box 50 is composed of, for example, a metallic housing main body 52 having a rectangular parallelepiped internal space 51 . The anechoic box 50 accommodates the DUT 100, the reflector 7 facing the antenna 110 of the DUT 100, and the test antenna 6 in an internal space 51 in such a manner as to prevent the intrusion of radio waves from the outside and the radiation of radio waves to the outside. It has become.

In addition, a radio wave absorber 55 is attached to the entire inner surface of the anechoic box 50, that is, the entire bottom surface 52a, side surface 52b, and upper surface 52c of the housing main body 52 to ensure the anechoic characteristics of the internal space 51. , the function to control the emission of radio waves to the outside has been strengthened. Thus, the anechoic box 50 forms an internal space 51 that is not affected by the surrounding radio wave environment. The anechoic box 50 used in this embodiment is, for example, a CATR (Compact Antenna Test Range) type anechoic chamber.

FIG. 5 is a perspective view of the anechoic box 50 according to the embodiment of the present invention, and FIG. 6 is a front view showing a state in which the door 470 of the anechoic box 50 of FIG. 5 is removed to separate the chambers. As shown in FIGS. 5 and 6, the anechoic box 50 according to this embodiment includes, in order from the left in FIG. These three chambers (also called divided chambers) are detachably connected to each other, and a box-shaped radio wave surrounded by a planar portion 67 such as a metal plate as shown in FIG. A dark box 50 is constructed. Specifically, the anechoic box 50 in the connected state has a peripheral wall portion 60 that encloses the periphery, and a top surface portion 61 and a bottom surface portion 62 that face each other above and below the peripheral wall portion 60 . The side of the anechoic box 50 on which the door 470 is attached is called the front, the left side is called the left side, the right side is called the right side, and the side facing the front is called the rear side.

FIG. 9 is a cross-sectional view of the anechoic box 50 of FIG. 1 taken along the line IX-IX. As shown in FIGS. 6 and 9, the anechoic box 50 or the housing main body 52 has a frame made of, for example, aluminum columnar frames 301, 401, and 501. Planar portions 67 such as 302, 402, 502 and metal interior plates 303, 403, 503 are attached. That is, each chamber part 300, 400, 500 comprises a frame 301, 401, 501 and a metal planar part 67 fixed to the frame, which are connected to each other to form a single or double layer. An internal space 51 surrounded by metal plates is formed. With such a frame structure, the desired strength is maintained, and the desired electromagnetic shielding performance is exhibited by fixing the planar portion 67 having a metal plate of appropriate thickness to the frame to form the wall portion and the like. It has become. In this embodiment, the frames 301, 401, and 501 are all of the same type, that is, have the same cross-sectional shape, but the type may be changed depending on where they are used.

(Connection structure of anechoic box)
FIG. 7 is an exploded perspective view of the anechoic box 50 of FIG. As shown in FIG. 7, the adjacent first chamber part 300 and second chamber part 400, and the adjacent second chamber part 400 and third chamber part 500 are connected using connecting shafts 310 and 510, respectively. are connected to each other. The connecting shaft 310 is passed through a through hole formed in the longitudinal direction of a frame 301A (referred to as a connecting frame) that extends across the entire width of the first chamber part 300 parallel to the Z-axis in the first chamber part 300, and is connected. One end of the shaft 310 is attached to the side surface of a frame 401 (referred to as a column frame) provided on the side facing the first chamber 300 in the second chamber 400, and the other end is attached to a hexagon socket bolt 326 or the like. is fixed to the first chamber part 300 by means of a fixture. Ten connecting shafts 310 are used, and therefore ten connecting frames 301A are provided. However, the number of connecting shafts 310 is not limited to this, and may be any number.

Similarly, the connecting shaft 510 passes through a through hole formed in the longitudinal direction of a frame 501A (referred to as a connecting frame) extending across the entire width of the third chamber portion 500 parallel to the Z-axis in the third chamber portion 500. One end of the connecting shaft 510 is attached to the side surface of a frame 401 (referred to as a column frame) provided on the side facing the third chamber 500 in the second chamber 400, and the other end has a hexagonal hole. It is secured to the third chamber portion 500 by a fixture such as a bolt 526 . Ten connecting shafts 510 are used, and therefore ten connecting frames 501A are provided. However, the number of connecting shafts 510 is not limited to this, and may be any number.

The second chamber part 400 is provided with a positioning pin 430 extending in the Z-axis direction on the side facing the first chamber part 300, and the first chamber part 300 guides the positioning pin 430. A pin receiving portion 532 having a guide hole for fitting is provided. Further, the second chamber portion 400 is provided with a positioning pin 430 extending in the negative direction of the Z-axis on the side facing the third chamber portion 500 . A pin receiving portion 532 having a guide hole for guiding and fitting the pin receiving portion 532 is provided.

FIG. 8 is a schematic diagram for explaining a method of connecting the first chamber section 300 and the second chamber section 400 using the connecting shaft 310. As shown in FIG. As shown in FIG. 8A, the connecting shaft 310 has a male thread 310c formed at one end 310a and a female thread 310d formed at the other end 310b. In addition, the frame 301 provided in the first chamber portion 300 extends horizontally across the entire width of the first chamber portion 300 in the direction of connection between adjacent chamber portions (referred to as the connection direction, which is the same as the Z-axis direction in FIG. 7). It includes a columnar connection frame 301A that extends and has a through hole 301d formed in the longitudinal direction. "Connecting direction" refers to the first chamber part 300 and the third chamber part 300 on either side of the central second chamber part 400 when connecting the first to third chamber parts 300, 400, 500 in FIG. is the direction in which the chamber part 500 is moved, and is also referred to as the Z-axis direction, the left-right direction, or the width direction.

The frame 401 provided in the second chamber section 400 includes a columnar support frame 401A having fixtures 420 that are slidable in the longitudinal direction on its sides. The support frame 401A extends in the vertical direction (Y-axis direction), but may be a frame extending in the front-rear horizontal direction (X-axis direction). The fixture 420 is formed with a female thread so as to be screwed into the male thread 310c formed on the one end 310a of the connecting shaft 310 . A concave streak portion 401e capable of accommodating the fixture 420 is formed in the longitudinal direction on the side portion of the support frame 401A. Further, the support frame 401A is formed with a through hole 401d through which the connecting shaft 310 can be inserted in the longitudinal direction.

Specifically, the support frame 401A has a columnar support section 401c having a through hole 401d in the longitudinal direction, and an outer frame 401g having a substantially rectangular cross-sectional outline supported by a support section 401f. is making A portion of the outer frame 401g is formed with an opening, and the outer frame 401, the support portion 401c, and the support portion 401f form a concave streak portion 401e extending in the longitudinal direction.

In this embodiment, the male thread 310c is formed on the one end 310a of the connecting shaft 310, and the female thread is formed on the fixture 420 side. may be provided, and a male thread may be provided on the fixture 420 side.

As shown in FIGS. 8(b), (c), and (d), the connecting shaft 310 has a gasket 424 and a retainer 422 attached to the side of the support frame 401A, and the male screw 310c at one end 310a is attached. , is detachably fixed by screwing it into the female screw of the fixture 420 of the adjacent second chamber part 400 . In this fixed state, the fixing member 420 cannot slide in the longitudinal direction of the support frame 401A because the outer frame 401g is sandwiched between the end portion of the fixing member 420 and the pressing member 422. Then, the connecting shaft 310 is inserted through the through hole 301d of the connecting frame 301A, and one end 301a of the connecting frame 301A contacts the side portion of the support frame 401A.

As shown in FIG. 8(e), the other end 310b of the connecting shaft 310 is attached to the other end 301b of the connecting frame 301A and the metal exterior plate 302 of the first chamber 300 from the outside, for example, a hexagon socket bolt 326 or the like. It is detachably fixed by means of a mounting fixture. Specifically, the outer plate 302 is brought into contact with the other end 301b of the connecting frame 301A with the gasket 324 and the retainer 322 interposed therebetween, and the hexagon socket bolt 326 is inserted into the hole formed in the outer plate 302 from the outside. A threaded portion is inserted, and the threaded portion is screwed into a female thread 310d formed on the other end portion 310b of the connecting shaft 310. As shown in FIG. As a result, the other end 310b of the connecting shaft 310 is fixed to the other end 301b of the connecting frame 301A and the exterior plate 302. As shown in FIG.

Although the connecting structure of the first chamber part 300 and the fourth chamber part 400 has been described with reference to FIG. 8, the connecting structure of the fifth chamber part 500 and the fourth chamber part 400 is the same.

The frames 301, 401, 501 used for the first to third chamber parts 300, 400, 500 are all formed with through-holes through which the connecting shafts 310, 510 can be inserted in the longitudinal direction, and are connected to the sides. The same cross-sectional structure may be provided with a grooved portion 401e capable of slidably accommodating a fixture 420 for fixing one end portion 310a of the shaft 310. As shown in FIG.

As shown in FIG. 7, the second chamber portion 400 is provided with a positioning pin 430, and a pin receiver having a guide hole for guiding and fitting the positioning pin 430 into the adjacent first and third chamber portions 300 and 500. A portion 532 is provided. However, the first and third chamber portions 300 and 500 may be provided with positioning pins, and the second chamber portion 400 may be provided with a pin receiving portion.

As shown in FIGS. 5 and 7, the anechoic box 50 of this embodiment further includes a door 470, which is formed on the walls of the second chamber part 400 and the third chamber part 500. It is attached to the openings 406 and 506 so as to be openable and closable.

As shown in FIG. 5, the anechoic box 50 is placed on a frame 53, and the measuring device 2 can be stored inside the frame 53 as shown in FIG. . As shown in FIG. 6, the pedestal 53 also has a first pedestal 350, a second pedestal 450, and a third pedestal 550 corresponding to each chamber. Each pedestal mounts the corresponding chamber part so that the height position can be adjusted, moves, and can be fixed on the installation floor.

(Assembly method)
FIG. 14 is a flow chart showing an outline of a method for assembling the anechoic box 50 according to the embodiment of the present invention.

First, the first to third chamber parts 300, 400, 500, the first to third mounts 350, 450, 550, the connecting shafts 310, 510, etc. are prepared. Then, the corresponding chamber section is placed on each mount.

Next, as shown in FIG. 10, the connecting shafts 310 are passed through the through holes 301d of the connecting frame 301A of the first chamber portion 300, and the pin receiving portions of the first chamber portion 300 position the second chamber portion 400. The first chamber part 300 is moved together with the mount 350 to the central second chamber part 400 so as to fit the pin 430 .

After the first chamber portion 300 is arranged at a position where the positioning pin 430 can be fitted to the mating pin receiving portion, one end portion 310a of the connecting shaft 310 is provided on the side portion of the support frame 401A of the second chamber portion 400. It is detachably fixed to the fixing tool 420 with female screw (S1). Specifically, as shown in FIG. 11, a flat portion 310e formed on the side surface of the connecting shaft 310 is rotated with a wrench 360, and a male screw 310c formed on one end portion 310a of the connecting shaft 310 is rotated at the center. The female screw of the fixture 420 of the column frame 401A of the second chamber part 400 is screwed.

Next, as shown in FIGS. 8(c) and 8(d), the first chamber part 300 together with the base 350 is further moved toward the second chamber part 400, and the connecting shaft 310 is inserted into the through hole of the connecting frame 301A. 301d is inserted (S2).

8D, 8E, and 12, the other end 310b of the connecting shaft 310 is detachably attached to the other end 301b of the connecting frame 301A and the exterior plate 302 of the first chamber section 300. (S3). Specifically, the connecting shaft 310 positioned near the other end 301b of the connecting frame 301A with the gasket 324 and the retainer 322 interposed between the end surface of the other end 301b of the connecting frame 301A and the exterior plate 302. A fixture such as a hexagon socket head bolt 326 is screwed from the outside of the exterior plate 302 into a female screw 310d formed on the other end 310b of the housing plate 302 and fixed. A similar connection work is performed for all the connection frames 301A of the first chamber section 300 (S4).

Next, as shown in FIG. 13, the pedestal 350 and the pedestal 450 are connected by connecting tools such as a pedestal connection plate 352 and screws 354 .

Similarly to the first chamber section 300, the third chamber section 500 is also connected to the second chamber section 400 using the connecting shaft 510 (S5). Also, the pedestal 450 and the pedestal 550 are connected by a pedestal connecting plate 552 or the like.

(DUT)
The DUT 100 to be tested is, for example, a wireless terminal such as a smart phone. Communication standards for the DUT 100 include cellular (LTE, LTE-A, W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, 1xEV-DO, TD-SCDMA, etc.), wireless LAN (IEEE802.11b/g/ a/n/ac/ad, etc.), Bluetooth®, GNSS (GPS, Galileo, GLONASS, BeiDou, etc.), FM, and digital broadcasting (DVB-H, ISDB-T, etc.). Also, the DUT 100 may be a wireless terminal that transmits and receives wireless signals in the millimeter waveband compatible with 5G cellular or the like.

In this embodiment, the DUT 100 is, for example, a 5G NR wireless terminal. For 5G NR wireless terminals, the 5G NR standard stipulates that a predetermined frequency band including other frequency bands used in LTE and the like, in addition to the millimeter wave band, should be the communicable frequency range. Therefore, the antenna 110 of the DUT 100 transmits or receives radio signals in a predetermined frequency band (5G NR band), which is the target of measurement of the transmission characteristics or reception characteristics of the DUT 100 . The antenna 110 is, for example, an array antenna such as a Massive-MIMO antenna, and corresponds to the antenna under test in the present invention.

In this embodiment, the DUT 100 can transmit and receive the test signal and the signal under test via the test antenna 6 and, if necessary, the reflector 7 or the mirror 9 during measurement of transmission and reception in the anechoic box 50. .

(attitude variable mechanism)
Next, the posture varying mechanism 56 provided in the internal space 51 of the anechoic box 50 will be described. As shown in FIG. 1, the bottom surface 52a of the housing main body 52 of the anechoic box 50 on the side of the internal space 51 is provided with an attitude variable mechanism 56 that changes the attitude of the DUT 100 placed in the quiet zone QZ. . The attitude variable mechanism 56 is, for example, a two-axis positioner having a rotation mechanism that rotates around each of two axes. The posture variable mechanism 56 constitutes an OTA test system (Combined-axes system) that rotates the DUT 100 with rotational freedom around two axes while the test antenna 6 is fixed. Specifically, the posture varying mechanism 56 has a driving section 56a, a turntable 56b, a support 56c, and a DUT mounting section 56d as a test target mounting section.

The driving unit 56a is composed of a driving motor such as a stepping motor that generates a rotational driving force, and is installed on the bottom surface 52a, for example. The turntable 56b is rotated by a predetermined angle around one of the two axes orthogonal to each other by the rotational driving force of the driving portion 56a. The post 56c is connected to the turntable 56b, extends in one axial direction from the turntable 56b, and rotates together with the turntable 56b by the rotational driving force of the driving portion 56a. The DUT mounting portion 56d extends from the side surface of the column 56c in the direction of the other of the two axes, and rotates about the other axis by a predetermined angle by the rotational driving force of the driving portion 56a. The DUT 100 is placed on the DUT placement portion 56d.

The one axis mentioned above is, for example, an axis (Y-axis in the figure) extending in a direction perpendicular to the bottom surface 52a. Further, the other axis mentioned above is, for example, an axis extending horizontally from the side surface of the column 56c. The attitude variable mechanism 56 configured in this manner rotates the DUT 100 held on the DUT mounting portion 56 d in all three-dimensional directions with respect to the test antenna 6 and the reflector 7 with the center of the DUT 100 as the rotation center, for example. The antenna 110 can be rotated so that the attitude can be changed sequentially.

(link antenna)
In the anechoic box 50, two types of link antennas 5 and 8 for establishing or maintaining a link (call) with the DUT 100 are provided at required positions of the housing body 52 using holders 57 and 59, respectively. installed. A link antenna 5 is a link antenna for LTE and is used in a non-standalone mode. On the other hand, the link antenna 8 is a link antenna for 5G and is used for maintaining 5G calls. The link antennas 5 and 8 are held by holders 57 and 59 respectively so as to have directivity with respect to the DUT 100 held by the attitude variable mechanism 56 . Since it is also possible to use the test antenna 6 as a link antenna instead of using the link antennas 5 and 8 described above, the test antenna 6 will be described below as also functioning as a link antenna. do.

(near field and far field)
Next, the near field and far field will be explained. A case where radio waves are transmitted directly from an antenna to the DUT 100 is called a DFF (Direct Far Field) system, and a case where radio waves are reflected from an antenna and propagated to the DUT 100 by a reflector 7 having a paraboloid of revolution is called an IFF (Indirect Far Field) system.

Radio waves emitted from an antenna as a radiation source have the property of propagating while a surface (wavefront) connecting points of the same phase spreads spherically around the radiation source. At a short distance from the radiation source, the wavefront is a curved spherical surface (spherical wave), but at a distance from the radiation source, the wavefront approaches a plane (plane wave). In general, the area where the wavefront should be considered spherical is called the near field (NEAR FIELD), and the area where the wavefront can be considered as a plane is called the far field (FAR FIELD). DUT 100 preferably receives plane waves rather than spherical waves for accurate measurements.

To receive plane waves, the DUT 100 needs to be placed in the far field. When the position of the antenna 110 within the DUT 100 and the size of the antenna are unknown, the far field is the area beyond 2D ² /λ from the antenna. where D is the maximum linear size of the DUT 100 and λ is the wavelength of radio waves.

In this embodiment, the CATR system is used, which is a system in which radio waves from the test antenna 6 a are reflected by the paraboloid of revolution of the reflector 7 and the reflected waves reach the position of the DUT 100 . According to this method, the distance between the test antenna 6a and the DUT 100 can be shortened, and since the area of the plane wave expands from the distance immediately after reflection on the reflecting mirror surface of the reflector 7, propagation loss can also be reduced. The degree of plane waves can be represented by the phase difference between waves in phase. An acceptable phase difference for plane waves is, for example, λ/16. The phase difference can be evaluated with a vector network analyzer (VNA), for example.

(test antenna)
Next, the test antenna 6 and the reflector 7 will be explained.

The test antenna 6 and the reflector 7 are placed inside the anechoic box 50 so as to transmit or receive radio signals to/from the antenna 110 of the DUT 100 . The test antenna 6 of this embodiment includes a reflector reflection type test antenna 6a, a direct type test antenna 6b, and mirror reflection type test antennas 6c, 6d, 6e, and 6f. The test antennas 6 each have a horizontally polarized antenna and a vertically polarized antenna (see FIG. 2).

A reflector reflection type test antenna 6a is used together with a reflector 7 and functions as a primary radiator. As the test antenna 6a, for example, a directional millimeter wave antenna such as a horn antenna can be used. The reflector 7 has a curved reflecting surface made of aluminum, for example, and reflects radio waves of radio signals for measurement. It has a parabolic structure. The reflector 7 is attached to a required position on the side surface 52b of the anechoic box 50 using a reflector holder 58, as shown in FIG.

Reflector 7 receives radio waves of test signals radiated from test antenna 6 a as a primary radiator arranged at a focal position determined by the paraboloid of rotation, and is held by attitude varying mechanism 56 . (during transmission). In addition, the reflector 7 receives the radio wave of the signal under test emitted from the antenna 110 by the DUT 100 receiving the test signal with its paraboloid of revolution, and reflects the radio wave toward the test antenna 6 (during reception). The reflector 7 is arranged at a position and posture that enable simultaneous transmission and reception. That is, the reflector 7 reflects radio waves of radio signals transmitted and received between the test antenna 6 and the antenna 110 of the DUT 100 on the paraboloid of revolution.

With this configuration, a radio wave (for example, a test signal for the DUT 100) radiated from the test antenna 6a is reflected by the paraboloid of revolution in a direction parallel to the axial direction of the paraboloid of revolution. A radio wave incident on the paraboloid of revolution in a direction parallel to the direction (for example, a signal to be measured transmitted from the DUT 100) can be reflected by the paraboloid of revolution and guided to the test antenna 6a. In other words, the reflector 7 converts the spherical radio waves radiated from the test antenna 6a into plane wave radio waves and sends them to the DUT 100, and converts the plane wave radio waves radiated from the DUT 100 and incident on the reflector 7 to the test antenna. 6a is focused. Compared to the parabolic type, the offset parabola can make the reflector 7 itself smaller and can be arranged such that the mirror surface is nearly vertical, so that the structure of the anechoic box 50 can be made smaller.

As shown in FIG. 1, the reflector reflection type test antenna 6a is arranged below a horizontal plane passing through the arrangement position of the DUT 100. As shown in FIG. A radio wave beam radiated from the test antenna 6 and reflected by the reflector 7 is propagated in the negative direction of the Z-axis to form a quiet zone QZ with a required radius.

The reflector reflection type test antenna 6a is adapted to form a so-called indirect far field (IFF). An indirect far field is a far field formed by a reflective antenna using a reflector that converts a spherical wave into a plane wave.

The direct-type test antenna 6b directly transmits or receives radio waves for measuring the transmission characteristics or reception characteristics of the DUT 100 between the antenna 110 of the DUT 100 and not through the reflector 7 or the mirror. It's like

The mirror reflection test antennas 6c, 6d, 6e, and 6f communicate with the antenna 110 of the DUT 100 via mirrors 9c, 9d, 9e, and 9f, respectively, to measure the transmission characteristics or reception characteristics of the DUT 100. is adapted to transmit or receive radio signals of Hereinafter, the mirrors 9c, 9d, 9e, and 9f may be collectively referred to simply as the mirror 9. Each mirror 9 is made of aluminum, for example, and has a flat mirror surface. A radio wave beam radiated from a mirror reflection type test antenna 6 is specularly reflected by a corresponding mirror 9 .

In this embodiment, the test antenna 6 and the mirror 9 have different arrival angles (for example, 30°, 60 , 90°, 120°, 150°). With this configuration, by switching and using the test antennas 6b, 6c, 6d, 6e, and 6f used together with a specific test antenna (for example, the test antenna 6a), the arrival angle is changed to transmit and receive the RRM characteristics of the DUT 100, etc. Far-field measurements of properties can be performed efficiently.

Next, the integrated control device 10 and the NR system simulator 20 of the test device 1 according to this embodiment will be described with reference to FIGS. 2 to 4. FIG.

(Integrated control device)
The integrated control device 10 comprehensively controls the NR system simulator 20 and the attitude variable mechanism 56 as described below. For this purpose, the integrated control device 10 is connected to the NR system simulator 20 and the attitude varying mechanism 56 so as to be able to communicate with each other via a network 19 such as Ethernet (registered trademark).

FIG. 3 is a block diagram showing the functional configuration of the integrated control device 10. As shown in FIG. As shown in FIG. 3 , the integrated control device 10 has a control section 11 , an operation section 12 and a display section 13 . The control unit 11 is configured by, for example, a computer device. This computer device, for example, as shown in FIG. , a non-volatile storage medium such as an SSD (Solid State Drive) or hard disk device (not shown), and various input/output ports.

The CPU 11a performs overall control of the NR system simulator 20 as a target. The ROM 11b stores an OS (Operating System) for starting up the CPU 11a, other programs, parameters for control, and the like. The RAM 11c stores the OS and application execution codes and data used by the CPU 11a. An external interface (I/F) unit 11d has an input interface function for inputting a predetermined signal and an output interface function for outputting a predetermined signal.

The external I/F section 11 d is communicably connected to the NR system simulator 20 via the network 19 . The external I/F section 11 d is also connected to the attitude varying mechanism 56 in the anechoic box 50 via the network 19 . An operation unit 12 and a display unit 13 are connected to the input/output port. The operation unit 12 is a functional unit for inputting various information such as commands, and the display unit 13 is a functional unit for displaying various information such as an input screen for the various information and measurement results.

The computer device described above functions as the control unit 11 by executing the program stored in the ROM 11b by the CPU 11a using the RAM 11c as a work area. The control unit 11 has a call connection control unit 14, a signal transmission/reception control unit 15, and a DUT attitude control unit 17, as shown in FIG. The call connection control unit 14, the signal transmission/reception control unit 15, and the DUT attitude control unit 17 are also implemented by the CPU 11a executing a predetermined program stored in the ROM 11b in the work area of the RAM 11c.

The call connection control unit 14 drives the test antenna 6 to transmit/receive a control signal (radio signal) to/from the DUT 100, thereby establishing a call (radio signal capable of transmitting/receiving) between the NR system simulator 20 and the DUT 100. state).

The signal transmission/reception control unit 15 monitors user operations on the operation unit 12, and when the user performs a predetermined measurement start operation related to measurement of the transmission characteristics and reception characteristics of the DUT 100, the call connection control unit 14 After the call connection control, a signal transmission command is transmitted to the NR system simulator 20 . Furthermore, the signal transmission/reception control unit 15 controls the NR system simulator 20 to transmit a test signal via the test antenna 6, transmits a signal reception command to the NR system simulator 20, control to receive the signal under measurement through the

In addition, the signal transmission/reception control unit 15 sets the arrival angle and selects the test antenna to be used in the transmission/reception characteristic test such as the RRM characteristic using two test antennas. Specifically, one of a plurality of predetermined arrival angles (eg, 30°, 60°, 90°, 120°, 150°) is selected and set as a measurement condition (stored in RAM 11c, etc.). . The arrival angle may be selected by the user, or may be automatically selected by the control unit 11 or the like. The signal transmission/reception control unit 15 selects a test antenna to be used from the plurality of test antennas 6 based on the set arrival angle. For this reason, for example, the RAM 11c or ROM 11b stores in advance an arrival angle-test antenna correspondence table 17b that indicates the correspondence between the arrival angles and the test antennas. The control unit 11 or the control unit 22 of the NR system simulator 20 may set the arrival angle and select the test antenna to be used.

The DUT attitude control section 17 controls the attitude of the DUT 100 held by the attitude varying mechanism 56 during measurement. To implement this control, for example, the RAM 11c or ROM 11b stores in advance a DUT attitude control table 17a. For example, when a stepping motor is employed as the driving unit 56a, the DUT attitude control table 17a stores the number of driving pulses (the number of operating pulses) for determining the rotational driving of the stepping motor as control data.

The DUT attitude control unit 17 develops the DUT attitude control table 17a in the work area of the RAM 11c, and based on the DUT attitude control table 17a, the DUT 100 is moved so that the antenna 110 is sequentially directed in all three-dimensional directions as described above. It drives and controls the attitude variable mechanism 56 so as to change its attitude.

(NR system simulator)
As shown in FIG. 4, the NR system simulator 20 of the test apparatus 1 according to this embodiment has a signal measurement section 21, a control section 22, an operation section 23, and a display section 24. FIG. The signal measurement unit 21 includes a signal generation function unit including a signal generation unit 21a, a digital/analog converter (DAC) 21b, a modulation unit 21c, and a transmission unit 21e of the RF unit 21d, a reception unit 21f of the RF unit 21d, It has a signal analysis function unit composed of an analog/digital converter (ADC) 21g and an analysis processing unit 21h. It should be noted that two sets of signal measurement units 21 may be provided so as to correspond to two test antennas to be used.

In the signal generation function unit of the signal measurement unit 21, the signal generation unit 21a generates waveform data having a reference waveform, specifically, for example, an I component baseband signal and a Q component baseband signal which is an orthogonal component signal thereof. Generate. The DAC 21b converts the waveform data (I component baseband signal and Q component baseband signal) having the reference waveform output from the signal generator 21a from a digital signal to an analog signal and outputs the analog signal to the modulator 21c. The modulation unit 21c mixes the local signal with respect to each of the I component baseband signal and the Q component baseband signal, further combines the two, and performs modulation processing to output a digital modulated signal. The RF section 21d generates a test signal corresponding to the frequency of each communication standard from the digital modulated signal output from the modulation section 21c, and outputs the generated test signal to the signal processing section 40 through the transmission section 21e.

The signal processing unit 40 performs signal processing such as frequency conversion of signals transmitted and received with the test antenna. The test signal output from the signal processing section 40 is sent to the test antenna via the signal switching section 41 and output from the test antenna toward the DUT 100 .

In the signal analysis function unit of the signal measurement unit 21, the RF unit 21d transmits the signal under measurement transmitted from the DUT 100 that received the test signal through the antenna 110, via the signal switching unit 41 and the signal processing unit 40. After being received by the receiving section 21f, the signal under measurement is mixed with a local signal to be converted into an intermediate frequency band signal (IF signal). The ADC 21g converts the signal under measurement, which has been converted into an IF signal by the receiving section 21f of the RF section 21d, from an analog signal into a digital signal, and outputs the digital signal to the analysis processing section 21h.

The analysis processing unit 21h digitally processes the signal under measurement, which is a digital signal output from the ADC 21g, to generate waveform data corresponding to the I component baseband signal and the Q component baseband signal, respectively, and converts the waveform data to A process for analyzing the I-component baseband signal and the Q-component baseband signal is performed based on . In measuring the transmission characteristics (RF characteristics) of the DUT 100, the analysis processing unit 21h measures, for example, Equivalent Isotropically Radiated Power (EIRP), Total Radiated Power (TRP), spurious radiation, and modulation accuracy. (EVM), transmission power, constellation, spectrum, etc. can be measured. In addition, the analysis processing unit 21h can measure, for example, reception sensitivity, bit error rate (BER), packet error rate (PER), etc. in measuring the reception characteristics (RF characteristics) of the DUT 100 . Here, EIRP is the radio signal strength in the main beam direction of antenna 110 of DUT 100 . Also, TRP is the total value of power radiated into space from the antenna 110 of the DUT 100 .

The analysis processing unit 21h can also analyze the RRM characteristics of the DUT 100, for example, whether or not the handover operation from one selected test antenna to another selected test antenna is performed normally. It's like

Like the control unit 11 of the integrated control device 10 described above, the control unit 22 is configured by a computer device including, for example, a CPU, a RAM, a ROM, and various input/output interfaces. The CPU performs predetermined information processing and control for realizing each function of the signal generation function section, the signal analysis function section, the operation section 23 and the display section 24 .

The operation unit 23 and the display unit 24 are connected to the input/output interface of the computer device. The operation unit 23 is a functional unit for inputting various information such as commands, and the display unit 24 is a functional unit for displaying various information such as an input screen for the various information and measurement results.

In this embodiment, the integrated control device 10 and the NR system simulator 20 are separate devices, but they may be configured as one device. In this case, the control section 11 of the integrated control device 10 and the control section 22 of the NR system simulator 20 may be integrated into one computer device.

(signal processor)
Next, the signal processing section 40 will be described.

The signal processing unit 40 is provided between the NR system simulator 20 and the signal switching unit 41, and is a first signal processing unit 40a that performs signal processing such as frequency conversion of signals transmitted and received with one test antenna used. and a second signal processing unit 40b that performs signal processing such as frequency conversion of signals transmitted and received with other test antennas to be used.

The first signal processing unit 40a and the second signal processing unit 40b each include an upconverter, a downconverter, an amplifier, a frequency filter, etc., and perform frequency conversion (upconversion) on the test signal to be transmitted to the test antenna used. ), amplification, frequency selection and other signal processing, and then output to the signal switching unit 41 . Also, the first and second signal processing units 40a and 40b each perform frequency conversion (down-conversion), amplification, The signals are subjected to signal processing such as selection and output to the signal measuring section 21 .

The signal switching unit 41 is provided between the signal processing unit 40 and the test antenna, and under the control of the control unit 22, the first signal processing unit 40a and the test antenna to be used are connected, and/or The signal path is switched so that the 2-signal processing unit 40b and the test antenna to be used are connected. The signal switching section 41 may be included in the signal processing section 40 .

(action/effect)
As described above, in the anechoic box 50 according to this embodiment, the first chamber section 300 and the second chamber section 400 are connected by the connecting shaft 310, and the second chamber section 400 and the third chamber section 400 are connected by the connecting shaft 510. are connected to form a box-like body surrounded by a planar portion 67 made up of metal exterior plates 302, 402, 502, and the like. As a result, even the anechoic box 50 having a large size can be divided and easily transported.

In addition, in the anechoic box 50 according to this embodiment, the connecting shaft 310 is inserted through the through hole 301d of the connecting frame 301A of the first chamber part 300, and the one end 310a of the connecting shaft 310 extends from the one end 301a of the connecting frame 301A. The other end 310b of the connecting shaft 310 is detachably fixed to the other end 301b of the connecting frame and the exterior plate 302 of the first chamber 300. It has become so. By fixing one end and the other end of the connecting shaft 310 to the adjacent first chamber 300 and second chamber 400, respectively, the anechoic box 50 can be easily assembled. . Further, since the connecting shaft 310 is guided and inserted into the through hole 301d of the connecting frame 301A, the movement of the connecting shaft 310 is restricted, and the connecting shaft 310 can be easily attached. By releasing the fixation of both ends of the connecting shaft 310, the anechoic box 50 can be easily divided.

Moreover, since the connecting shaft 310 is inserted through the through-hole 301d of the connecting frame 301A extending over the entire width of the first chamber portion 300 horizontally in the left and right connecting direction and fixed, the anechoic box 50 can be removed during assembly and division. There is no need to go around behind the machine, and even if there is a wall behind the machine and workers cannot enter, the machine can be easily assembled and divided from the left and right sides.

Therefore, the anechoic box 50 according to this embodiment can be easily divided and transported, and can be easily assembled at the transport destination.

In addition, in the anechoic box 50 according to the present embodiment, the frame 401 provided in the second chamber section 400 includes a columnar support frame 401A having a fixture 420 that is slidable in the longitudinal direction. is fixed to the fixture 420 of the support frame 401A in a longitudinally non-slidable state.

With this configuration, the one end portion 310a of the connecting shaft 310 is fixed to the fixture 420 of the support frame 401A having a relatively high strength provided in the adjacent second chamber portion 400, so that it can be firmly fixed. In addition, since the fixture 420 is slidable before the one end 310a of the connecting shaft 310 is fixed to the fixture 420, the positions of the one end 310a of the connecting shaft 310 and the fixture 420 can be easily adjusted.

Further, in the anechoic box 50 according to the present embodiment, the frames included in the first to third chamber parts 300, 400, 500 are formed with through holes 301d through which the connecting shafts 310 can be inserted in the longitudinal direction, It has the same cross-sectional shape provided with a recessed streak portion 401e capable of slidably accommodating the fixture 420 at its portion. With this configuration, the same type of frame having the same shape in cross section can be cut to a required length and used, so that the manufacturing cost can be reduced.

In addition, in the anechoic box 50 according to the present embodiment, the frame included in one chamber portion 400 of the two adjacent chamber portions is provided with the positioning pin 430, and the frame included in the corresponding other chamber portion 300, 500 A pin receiving portion 532 having a guide hole for guiding and inserting the positioning pin 430 is provided. With this configuration, it is possible to accurately and easily position the two connected chamber parts. Further, since the positioning pin 430 and the pin receiving portion 532 are attached to the relatively strong frame of the anechoic box 50, the positioning pin 430 or the pin receiving portion 532 can support the mating chamber portion during positioning.

(Other embodiments)
Although the 3-partitioned anechoic box 50 has been described, the number of divisions is not limited to 3, and a 2-partitioned anechoic box may be formed by connecting two chambers.

In the above embodiment, the connecting shaft 310 is inserted through the through hole 301d of the connecting frame 301A of the first chamber part 300, and the one end 310a of the connecting shaft 310 is fixed to the support frame 401A of the second chamber part 400. is not limited to this configuration. For example, the connecting shaft 310 is inserted into the through hole 301d of the connecting frame 301A of the first chamber part 300 and through the through hole of the frame 401 of the second chamber part 400 extending in the same direction as the connecting frame 301A. , and may be fixed to the frame 501 of the third chamber portion 500 .

Further, for example, the connecting shaft 310 is inserted through the through hole 301d of the connecting frame 301A of the first chamber part 300, and penetrates the frame 401 of the second chamber part 400 extending in the same direction as the connecting frame 301A. The end of the connecting shaft 310 is then inserted through the hole, and further through the through hole of the frame 501 of the third chamber portion 500, and the end of the connecting shaft 310 is fastened from the outside of the exterior plate 502 of the third chamber portion 500 with a hexagon bolt or the like. You may make it fix a part.

INDUSTRIAL APPLICABILITY As described above, the present invention has the effect that it can be easily divided and transported, and can be easily assembled at the destination. Useful.

Reference Signs List 1 test device 2 measurement device 5, 8 link antenna 6, 6a, 6b, 6c, 6d, 6e, 6f test antenna 7 reflector 9, 9c, 9d, 9e, 9f mirror 10 integrated control device 11, 22 control unit 11a CPU
11b ROM
11c RAM
11d External interface unit 12, 23 Operation unit 13, 24 Display unit 14 Call connection control unit 15 Signal transmission/reception control unit 17 DUT attitude control unit 17a DUT attitude control table 17b Arrival angle-test antenna correspondence table 19 Network 20 NR system simulator 21 Signal measuring section 21a Signal generating section 21b DAC
21c modulating section 21d RF section 21e transmitting section 21f receiving section 21g ADC
21h analysis processing unit 40 signal processing unit 40a first signal processing unit 40b second signal processing unit 41 signal switching unit 50 electromagnetic anechoic box 51 internal space 52 housing body 52a bottom surface 52b side surface 52c top surface 53 base 55 electromagnetic wave absorber 56 attitude variable Mechanism 56a Drive section 56b Turntable 56c Post 56d DUT placement section 57, 59 Holder 58 Reflector holder 60 Peripheral wall section 61 Top panel section 62 Bottom panel section 67 Planar section 100 DUT (test object)
110 Antenna under test 300 First chamber 301, 401, 501 Frame 301A, 501A Connection frame 301a One end 301b Other end 301d Through hole 302, 402, 502 Exterior plate 303, 403, 503 Interior plate 310, 510 Connection shaft 310a One end Part 310b Other end 310c Male screw 310d Female screw 310e Flat part 322, 422 Clamps 324, 424 Gaskets 326, 526 Hexagon socket head bolts 350 First mounts 352, 552 Mounts connector 354 Screw 360 Spanner 400 Second chamber Part 401A Support frame 401c Support part 401d Through hole 401e Concave part 401f Support part 401g Outer frame 406 Opening 420 Fixing tool 430 Positioning pin 450 Second mount 470 Door 500 Third chamber 506 Opening 532 Pin receiving part 550 Third stand QZ Quiet Zone

In order to solve the above problems, an anechoic box according to the present invention is an anechoic box (50) used for measuring transmission or reception characteristics of a wireless terminal, comprising metal frames (301, 401, 501) and A plurality of chambers (300, 400, 500) comprising metal planar portions (302, 402, 502) fixed to the frame, and connected to each other to form a box-shaped body surrounded by the planar portions. ) and a connecting shaft (310) connecting a first chamber portion (300) and a second chamber portion (400) adjacent among the plurality of chamber portions, wherein the first chamber portion is The frame includes a columnar connection frame (301A) extending horizontally in the connection direction across the entire width of the first chamber portion and having a through hole (301d) formed in the longitudinal direction, and the connection shaft is inserted through the through hole of the connecting frame, one end of the connecting shaft (310a) is detachably fixed to the second chamber part at one end of the connecting frame, and the other end of the connecting shaft A portion (310b) is detachably fixed to the other end of the connecting frame, and the other end of the connecting shaft is orthogonal to the connecting direction of the first chamber portion together with the other end of the connecting frame. It is fixed detachably to the planar portion .

Moreover, since the connecting shaft is fixed by being inserted through the through hole of the connecting frame extending horizontally in the left and right connecting direction over the entire width of the first chamber part, it is not necessary to go behind the anechoic box when assembling and dividing. In addition, even if there is a wall or the like in the back and workers cannot enter, it is possible to easily assemble and divide from the left and right.
Further, in the anechoic box according to the present invention, the other end of the connecting shaft is detachably fixed not only to the other end of the connecting frame but also to the planar portion such as the exterior plate, so that the assembly work can be performed efficiently. can be done.

A method of assembling an anechoic box according to the present invention is a method of assembling an anechoic box (50) used for measuring transmission or reception characteristics of a wireless terminal, comprising metal frames (301, 401, 501) and A plurality of chambers (300, 400, 500) comprising metal planar portions (302, 402, 502) fixed to the frame, and connected to each other to form a box-shaped body surrounded by the planar portions. ) and a connecting shaft (310) connecting the adjacent first chamber portion (300) and the second chamber portion (400) among the plurality of chamber portions, The frame provided in the chamber part (300) is a columnar connection frame (301A) extending horizontally in the direction of the connection over the entire width of the first chamber part and having a through hole (301d) formed in the longitudinal direction. one end (310a) of the connecting shaft is detachably fixed to the adjacent second chamber part (400), and the connecting shaft is inserted through the through hole of the connecting frame. and detachably fixing the other end (310b) of the connecting shaft to the other end of the connecting frame and the planar portion orthogonal to the connecting direction of the first chamber. characterized by

Claims (8)

An anechoic box (50) used for measuring transmission or reception characteristics of a wireless terminal,
Box-shaped bodies each comprising a metal frame (301, 401, 501) and a metal planar part (302, 402, 502) fixed to the frame, connected to each other and surrounded by the planar part a plurality of chambers (300, 400, 500) constituting
a connecting shaft (310) connecting a first chamber part (300) and a second chamber part (400) adjacent among the plurality of chamber parts,
The frame provided in the first chamber part is a columnar connection frame (301A) extending horizontally in the direction of connection over the entire width of the first chamber part and having a through hole (301d) formed in the longitudinal direction. ), including
The connecting shaft is inserted through the through hole of the connecting frame, one end (310a) of the connecting shaft is detachably fixed to the second chamber part at one end of the connecting frame, and the connecting shaft is The anechoic box, wherein the other end (310b) is detachably fixed to the other end of the connecting frame. The frame provided in the second chamber part includes a columnar strut frame (401A) having a longitudinally slidable fixture (420), and the one end of the connecting shaft is connected to the fixing part of the strut frame. 2. The anechoic box according to claim 1, wherein said anechoic box is fixed to said fixture so as not to be slidable in said longitudinal direction. The frames included in the plurality of chambers have the same cross section, each having a through hole through which the connecting shaft can be inserted in the longitudinal direction, and a concave streak that can slidably accommodate the fixture on the side. 3. The anechoic box according to claim 2, having a shape. 4. The anechoic box according to claim 1, wherein the other end of said connecting shaft is detachably fixed to said planar portion of said first chamber together with the other end of said connecting frame. . further comprising another connecting shaft (510) connecting the second chamber portion and the third chamber portion (500) adjacent among the plurality of chamber portions;
The frame included in the third chamber portion includes a columnar connection frame (501A) extending horizontally in the direction of connection over the entire width of the third chamber portion and having a through hole formed in the longitudinal direction. ,
The separate connecting shaft is inserted through the through hole of the connecting frame of the third chamber, and one end of the separate connecting shaft attaches to and detaches from the second chamber at one end of the connecting frame. 5. The anechoic box according to any one of claims 1 to 4, wherein the other connecting shaft is fixed freely, and the other end of the separate connecting shaft is detachably fixed to the other end of the connecting frame. A positioning pin (430) is provided in the frame provided in one of the two adjacent chambers among the plurality of chambers, and guides the positioning pin to the frame provided in the other corresponding chamber. 6. The anechoic box according to any one of claims 1 to 5, further comprising a pin receiving portion (532) having a guide hole into which the pin receiving portion (532) is fitted. A test apparatus (1) for measuring transmission characteristics or reception characteristics of a device under test (100) having an antenna under test (110),
The anechoic box according to any one of claims 1 to 6, which has an internal space (51) that is not affected by the surrounding radio wave environment;
one or more test antennas (6) for transmitting or receiving radio signals to or from the antenna under test;
a posture changing mechanism (56) for sequentially changing the posture of the test object placed in the quiet zone (QZ) in the internal space;
Selectively using one or a plurality of test antennas among the plurality of test antennas for the test object disposed within the quiet zone in the internal space, the transmission characteristics or reception of the test object a measuring device (2) for measuring properties. A method of assembling an anechoic box (50) used for measuring transmission or reception characteristics of a wireless terminal,
Box-shaped bodies each comprising a metal frame (301, 401, 501) and a metal planar part (302, 402, 502) fixed to the frame, connected to each other and surrounded by the planar part a plurality of chambers (300, 400, 500) constituting
preparing a connecting shaft (310) that connects the first chamber portion (300) and the second chamber portion (400) that are adjacent among the plurality of chamber portions;
The frame provided by the adjacent first chamber part (300) extends horizontally in the direction of the connection over the entire width of the first chamber part and has a through hole (301d) formed in the longitudinal direction. including a columnar connecting frame (301A),
one end portion (310a) of the connecting shaft is removably fixed to the adjacent second chamber portion (400);
inserting the connecting shaft through the through hole of the connecting frame;
the other end (310b) of the connecting shaft is detachably fixed to the other end of the connecting frame and the planar portion of the first chamber;
A method of assembling an anechoic box, comprising:

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