CN111541497A - Air interface testing device for wireless communication performance of Internet of things terminal - Google Patents
Air interface testing device for wireless communication performance of Internet of things terminal Download PDFInfo
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- CN111541497A CN111541497A CN202010323250.4A CN202010323250A CN111541497A CN 111541497 A CN111541497 A CN 111541497A CN 202010323250 A CN202010323250 A CN 202010323250A CN 111541497 A CN111541497 A CN 111541497A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses an air interface testing device for wireless communication performance of an Internet of things terminal, which comprises a shielding body, wherein a wave absorbing material layer is laid on the inner surface of the shielding body, a shielding door for placing a tested piece is arranged on one side surface of the shielding body, an interface board connected with a testing instrument is arranged on the side wall of the bottom outside the shielding body, a dual-polarized horn antenna is embedded in the center of the upper end surface of the shielding body and extends into an inner cavity of the shielding body, a supporting frame is arranged on the inner bottom surface of the shielding body, an object placing table with an adjustable vertical position is arranged at the upper end of the supporting frame, the center of the object placing table is over against the center of the dual-polarized horn. The test equipment can meet the far field test conditions of the tested terminals with different height sizes, and the path loss can be accurately measured.
Description
Technical Field
The invention relates to the technical field of Internet of things, in particular to an air interface testing device for wireless communication performance of an Internet of things terminal.
Background
The current internet of things terminal uses various wireless communication technologies (such as NB-IOT, Lora, WIFI, Bluetooth and the like, and the working frequency band is 450 MHz-6 GHz) to realize information interaction and control among objects, so the wireless communication performance is one of the performances of the internet of things terminal which needs to pay attention, and the existing wireless performance air interface test methods have two types:
the first is to use a shielding box, as shown in fig. 1, a terminal of the internet of things is placed in the shielding box, and connection is established in the shielding box through an antenna coupling mode between a test instrument (externally connected with an antenna through a radio frequency cable) and the terminal (a complete machine with the antenna), so as to perform corresponding wireless communication performance test. The performance test is carried out by the spatial coupling of the measuring antenna (external test instrument) inside the shielding box and the terminal antenna, and in this way, the shielding box is used for shielding external interference signals. However, the space loss from the terminal antenna to the measuring antenna in the shielded room environment cannot be accurately measured because the shielded room environment reflects and refracts the transmitted signal. And the terminal moves slightly relative to the measuring antenna position, a loss deviation of 3dB and above may occur. Therefore, the test mode can only carry out qualitative test analysis and can not carry out quantitative test.
The second is to use a far-field OTA antenna darkroom to continue the test mode of the portable mobile terminal. As shown in fig. 2 or fig. 3, a performance test is performed by spatially coupling a measuring antenna 3 (external test instrument) and a terminal antenna inside a darkroom 1, the terminal antenna is located at the center of a rotating system as much as possible, the terminal antenna and the measuring antenna 3 keep a fixed distance in the test process, and the far field condition of electromagnetic wave transmission is satisfied. In the environment of the darkroom 1, the shell of the darkroom 1 is made of shielding materials and used for shielding external interference, and wave-absorbing materials are paved in the darkroom 1, so that the signal transmission from the measuring antenna 3 to a measured terminal is close to ideal free space transmission. And the measurement antenna 3 used in the darkroom 1 is a high gain (gain calibratable) dual polarized horn antenna, which allows accurate measurement of the path (including space loss) loss using a standard dipole antenna. The value of the tester table plus the value of the corresponding path loss is the corresponding quantitative wireless communication performance test index. As shown in fig. 2, the combined shaft system drives the tested terminal 2 fixed on the bracket to rotate by connecting two rotating shafts, so as to generate test points in a 360-degree space relative to the tested terminal 2, and the weighted average of the values of all the test points is the value of the wireless communication performance of the terminal. As shown in fig. 3, the distributed system generates test points in 360 degrees relative to the terminal 2 under test by the rotation of the support rod plus the selection of the measuring antenna 3 on the test ring, and the weighted average of the values of all the test points is the value of the wireless communication performance of the terminal.
1. As shown in fig. 3, the far-field OTA antenna darkroom 1 is suitable for a portable mobile terminal, and mainly considers that when the portable mobile terminal is in operation, the terminal is moving, and signals may be transmitted from a 360-degree space, so that the 360-degree signal transmission quality of the space needs to be tested. Therefore, a large darkroom 1 and a large 3D turntable need to be built, so that the manufacturing cost is expensive; and many thing networking terminals are used in the specified position after being installed, and these thing networking terminal backplate still have bold metal, so, thing networking terminal only need consider preceding equiangular signal transmission's quality. Therefore, a far-field OTA small darkroom with a fixed angle can be constructed.
2. Because the size and the form of the terminal of the internet of things are various, if a combined shaft system is used, the terminal of the internet of things in each form needs to customize a corresponding test fixture, so the system is not suitable for testing the wireless communication performance of the terminal of the internet of things. For a distributed system, a tested terminal can be conveniently placed on a storage platform on a support bar; however, for the terminal test of the internet of things, the antenna position of the tested terminal needs to be at the rotation center in the test process, but the height of the supporting rod is fixed, so that the tested terminal can only be a terminal with the antenna height being a certain fixed height, and the height plus the height of the supporting rod just falls into the rotation center.
Disclosure of Invention
The invention aims to provide an air interface testing device for wireless communication performance of an Internet of things terminal.
The technical scheme adopted by the invention is as follows:
thing networking terminal wireless communication performance empty port testing arrangement, it includes the shielding body, the absorbing material layer is laid to the internal surface of shielding body, the shield door that supplies the measured piece to put into is seted up to a side of shielding body, be equipped with the interface board of being connected with the test instrument on the outside bottom lateral wall of shielding body, the up end center department embedding dual polarization horn antenna of shielding body, dual polarization horn antenna stretches into the inner chamber setting of shielding body, be equipped with the support frame on the inside bottom surface of shielding body, the upper end of support frame has a vertical direction position adjustable and puts the thing platform, it is just setting up to dual polarization horn antenna's center to put the center of thing platform, it is used for placing the measured.
Furthermore, the upper surface of the object placing table is provided with a grid formed by dividing longitudinal lines and transverse lines, the central axis of the grid is a thickened line, the central point of the grid is thickened with marks, a plurality of positioning points distributed at intervals are selected around the central point of the grid, and the positioning points are marked by thickened crossed lines.
Furthermore, the locating point is 24, and 24 locating points and central point even interval distribution put the thing platform upper surface.
Furthermore, the grid is provided with one thick line every 2CM, and a thin line is arranged between the two thick lines at the interval of 1 CM.
Further, the support frame is still including placing the backplate in the inside bottom surface of shield, the vertical bracing piece that sets up in four corners of backplate, and the surface of bracing piece has the screw thread, and the four corners of putting the thing platform is equipped with the via hole, and the diameter of via hole is greater than the diameter of bracing piece, puts the thing platform setting in the upper end of bracing piece, and every bracing piece corresponds the bottom cover of putting the thing platform and is equipped with the nut, and the internal thread diameter of nut is the same with the external diameter of supporting the thick stick, and the periphery diameter of nut. Through the position of adjusting nut, drive and put the thing platform and reciprocate in the range of 2m ~2.4m apart from dual polarization horn antenna.
In order to put placing stability of thing platform, the via hole diameter only need be a little more than and support thick stick diameter, recommends 2mm greatly.
Furthermore, the object placing table is made of an electromagnetic wave transparent and high-hardness material, such as an acrylic or high-density polystyrene material; the thickness of the object placing table is not less than 2 CM.
Further, the shield has a housing made of a metal plate.
Furthermore, universal wheels are arranged on four corners of the outer bottom surface of the shielding body.
By adopting the technical scheme, the invention has the beneficial effects of: 1. the accuracy is as follows: the testing equipment can meet far-field testing conditions of a tested terminal (the size is within 50cm x 40cm, the size of an antenna is within 19cm, and the working frequency band is within 450 MHz-8 GHz), and path loss (including space loss) can be accurately measured. 2. Convenience: the method comprises the steps that firstly, the terminals of the Internet of things in various shapes are placed conveniently in a placing table mode; the second path loss is convenient to calibrate, the object placing surface is adjustable within the range of 0-40 cm, various internet of things terminal tests within the height of 40cm can be met, and the antenna central plane and the measuring antenna are guaranteed to keep a fixed height. Therefore, various internet of things terminals within 40cm of height can be suitable only by calibrating the path loss under the height; 3. the economic efficiency is as follows: the far-field small darkroom is not more than 1/4 which meets the requirement of a similar terminal far-field OTA antenna darkroom.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and the detailed description;
FIG. 1 is a diagram illustrating a shielding chamber test architecture in the prior art;
FIG. 2 is a schematic diagram of a prior art axial combination test structure for a darkroom of a far-field OTA antenna;
FIG. 3 is a diagram of a distributed test structure for a darkroom of a far-field OTA antenna in the prior art;
fig. 4 is an external structural schematic diagram of an air interface testing device for wireless communication performance of an internet of things terminal according to the invention;
fig. 5 is a schematic diagram of an internal structure of an air interface testing device for wireless communication performance of an internet of things terminal according to the present invention;
FIG. 6 is a partially enlarged view of the connection between the support rod and the object placing table in FIG. 5A;
fig. 7 is a partially enlarged view of the connection between the support rod and the back plate in fig. 5B.
FIG. 8 is a schematic view of a grid on the top surface of the object table of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solution in the present application will be described below with reference to the accompanying drawings.
As shown in fig. 4 to 8, the invention discloses an air interface testing device for wireless communication performance of an internet of things terminal, which comprises a shielding body 1, wherein a wave absorbing material layer 2 is laid on the inner surface of the shielding body 1, a shielding door 3 for placing a tested piece is arranged on one side surface of the shielding body 1, an interface board 4 connected with a testing instrument is arranged on the side wall of the bottom outside the shielding body 1, a dual-polarized horn antenna 5 is embedded in the center of the upper end surface of the shielding body 1, the dual-polarized horn antenna 5 extends into an inner cavity of the shielding body 1, a support frame 6 is arranged on the bottom surface inside the shielding body 1, an object placing table 7 with an adjustable vertical position is arranged at the upper end of the support frame 6, the center of the object placing table 7 is arranged right opposite to the center of.
Specifically, the shield 1 (darkroom housing) is a cuboid, the whole small darkroom housing is made of metal plates, and is generally made of shielding steel, and the size of the shielding steel is not less than 95cm (width) 95cm (depth) 275cm (height); the device is used for shielding external interference signals; the shielding door 3 is also made of a metal plate, has the size of not less than 50cm (long) by 50cm (high), and is used for placing a measured piece into a door of a dark room; the frequency range of the dual-polarized horn antenna 5 is 450 MHz-8 GHz, and the gain in the frequency band range is not less than 4 dBi.
The interface board 4 is provided with 2N-type adapters, 2 SMA-type adapters, 2 BNC-type adapters and 4 USB adapters (with USB filters);
the object placing table 7 is a cuboid, the size is not less than 50CM (long) by 50CM (wide), and the thickness of the object placing table 7 is not less than 2 CM. The object placing table 7 is made of an electromagnetic wave transparent and high-hardness material, such as an acrylic or high-density polystyrene material. During testing, the center of the antenna of the tested piece is as close to the center of the object placing table 7 as possible.
Further, the upper surface of the platform 7 has a mesh 70 divided by the vertical and horizontal lines 70, the mesh 70 is provided with one thick line 74 every 2CM, and one thin line 75 is provided between the two thick lines 74 at an interval of 1 CM. The central axis 71 of the grid 70 is a thickened line, the grid central point 72 is marked with a thickened line, a plurality of positioning points 73 distributed at intervals are selected around the grid central point 72, and the positioning points 73 are marked with thickened cross lines.
Furthermore, the number of the positioning points 73 is 24, and the 24 positioning points 73 and the central point 72 are uniformly distributed on the upper surface of the object placing table 7 at intervals.
Specifically, if the transverse central axis 71 is an X axis, the longitudinal central axis 71 is a Y axis, the coordinates of the central point 72 are (0, 0), and the coordinates of the other 24 points are: (-20, 20), (-10, 20), (0, 20), (10, 20), (20, 20); (-20, 10), (-10, 10), (0, 10), (10, 10), (20, 10); (-20, 0), (-10, 0), (10, 0), (20, 0); (-20, -10), (-10 ), (0, -10), (10, -10), (20, -10); (-20),(-10, -20),(0, -20),(10, -20),(20, -20).
Further, support frame 6 is still including placing backplate 8 in the inside bottom surface of shield 1, the vertical bracing piece 9 that sets up in four corners of backplate 8, the surface of bracing piece 9 has the screw thread, the four corners of putting thing platform 7 is equipped with via hole 12, the diameter of via hole 12 is greater than the diameter of bracing piece 9, it sets up the upper end at bracing piece 9 to put thing platform 7, every bracing piece 9 corresponds the bottom cover of putting thing platform 7 and is equipped with nut 10, the internal thread diameter of nut 10 is the same with the external diameter of supporting the thick stick, the periphery diameter of nut 10 is greater than and puts thing platform 7 via hole 12 diameter. Through the position of adjusting nut 10, drive and put thing platform 7 and reciprocate at 2m ~2.4m within range apart from dual polarization horn antenna 5. In order to stably place the object placing table 7, the diameter of the through hole 12 is only slightly larger than that of the supporting rod, and is recommended to be 2mm larger.
Specifically, the support rod 9 is made of a cylindrical material and is provided with a platform 7, the diameter of the cylindrical material is not less than 3cm, and the height of the cylindrical material is not less than 60 cm. The material of backplate 8 also puts thing platform 7 together, and backplate 8 is the cuboid, 8 sizes of backplate are with 1 internal dimensions of shielding body, and 8 thickness of backplate are not less than 3cm, and bracing piece 9 is fixed on this backplate 8. The back plate 8 is arranged at the bottom of the darkroom, and the wave-absorbing material is arranged on the back plate 8;
4 nuts 10 are matched with the support rods 9, the nuts 10 are made of materials and are matched with the object placing table 7, the main bodies of the nuts 10 are hollow cylinders, the inner diameters of the nuts 10 are matched with the support rods, threads are arranged on the inner surfaces of the nuts, the outer diameters of the nuts 10 are larger than the through holes 12 of the object placing table 7, and are recommended to be larger than 5mm and more, and the nuts can support the weight of a detected piece to be adjusted according to needs; the nut 10 is provided with ears to facilitate forced rotation. The nut 10 is rotated to drive the object placing table 7 to move up and down within a range of 2 m-2.4 m away from the horn antenna. Thus, the position of the object placing table 7 is adjusted according to the height of the antenna of the detected object, and the center of the antenna of the detected object is ensured to fall on the surface 2m away from the center of the horn antenna.
Further, in order to facilitate the movement of the darkroom, universal wheels 11 are arranged on four corners of the outer bottom surface of the shielding body 1.
Specifically, the test device of the present invention meets the following performance index requirements. 1. Shielding performance: according to an EN50147-1 standard test method, the shielding performance is more than 90dB from 450MHz to 8 GHz; 2. keeping the testing distance of 2 m; 3. path loss fluctuation: and a vertical plane (opposite to the horn antenna) 2m away from the center of the horn antenna, wherein the center of the darkroom is positioned in a 50 cm-50 cm area, the signal frequency range is 450 MHz-8 GHz, and the point of the area fluctuates between-1 dB relative to the spatial transmission loss of the horn antenna. The testing method is that the object placing table 7 is adjusted to be 2m away from the horn antenna, the standard dipole antenna (with the frequency range of 450 MHz-8 GHz) is used for testing the space transmission loss at 25 points marked by the object placing table 7,
by adopting the technical scheme, the invention has the beneficial effects of: 1. the accuracy is as follows: the testing equipment can meet far-field testing conditions of a tested terminal (the size is within 50cm x 40cm, the size of an antenna is within 19cm, and the working frequency band is within 450 MHz-8 GHz), and path loss (including space loss) can be accurately measured. 2. Convenience: the method comprises the steps that firstly, the terminals of the Internet of things in various shapes are placed conveniently in a placing table mode; the second path loss is convenient to calibrate, the object placing surface is adjustable within the range of 0-40 cm, various internet of things terminal tests within the height of 40cm can be met, and the antenna central plane and the measuring antenna are guaranteed to keep a fixed height. Therefore, various internet of things terminals within 40cm of height can be suitable only by calibrating the path loss under the height; 3. the economic efficiency is as follows: the far-field small darkroom is not more than 1/4 which meets the requirement of a similar terminal far-field OTA antenna darkroom.
In the description of the embodiments of the present application, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as conventionally placed in use of the product of the application, or as conventionally understood by those skilled in the art, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Claims (9)
1. Thing networking terminal wireless communication performance air interface testing arrangement, its characterized in that: it includes the shielding body, the absorbing material layer is laid to the internal surface of shielding body, the shield door that supplies the measured piece to put into is seted up to a side of shielding body, be equipped with the interface board of being connected with the test instrument on the outside bottom lateral wall of shielding body, the up end center department embedding dual polarization horn antenna of shielding body, dual polarization horn antenna stretches into the inner chamber setting of shielding body, be equipped with the support frame on the inside bottom surface of shielding body, the upper end of support frame has a vertical direction position adjustable and puts the thing platform, the center of putting the thing platform is just setting up the center of dual polarization horn antenna, it is used for placing the measured piece to put the.
2. The internet of things terminal wireless communication performance air interface testing device of claim 1, characterized in that: the upper surface of the object placing table is provided with a grid formed by dividing longitudinal lines and transverse lines, the central axis of the grid is a thickened line, the central point of the grid is thickened and marked, a plurality of positioning points distributed at intervals are selected around the central point of the grid, and the positioning points are marked by thickened crossed lines.
3. The internet of things terminal wireless communication performance air interface testing device of claim 2, characterized in that: the setpoint is 24, and 24 locating points and the even interval distribution of central point put thing platform upper surface.
4. The internet of things terminal wireless communication performance air interface testing device of claim 2, characterized in that: the grid is provided with one thick line every 2CM, and a thin line is arranged between the two thick lines at the interval of 1 CM.
5. The internet of things terminal wireless communication performance air interface testing device of claim 1, characterized in that: the support frame is still including placing the backplate in the inside bottom surface of shield, the vertical bracing piece that sets up in four corners of backplate, the surface of bracing piece has the screw thread, the four corners of putting the thing platform is equipped with the via hole, the diameter of via hole is greater than the diameter of bracing piece, put the thing platform setting in the upper end of bracing piece, every bracing piece corresponds the bottom cover of putting the thing platform and is equipped with the nut, the internal thread diameter of nut is the same with the external diameter of supporting the thick stick, the periphery diameter of nut is greater than puts thing platform via hole diameter, it passes through swivel nut adjustable position and then drives by survey terminal antenna and measure.
6. The Internet of things terminal wireless communication performance air interface testing device of claim 5, wherein: the diameter of the via hole is 2mm larger than that of the supporting rod.
7. The internet of things terminal wireless communication performance air interface testing device of claim 1, characterized in that: the object placing table is made of electromagnetic wave transparent and high-hardness materials, and the thickness of the object placing table is not less than 2 CM.
8. The internet of things terminal wireless communication performance air interface testing device of claim 1, characterized in that: the shield has a housing made of sheet metal.
9. The internet of things terminal wireless communication performance air interface testing device of claim 1, characterized in that: the four corners of the outer bottom surface of the shielding body are provided with universal wheels.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010323250.4A CN111541497A (en) | 2020-04-22 | 2020-04-22 | Air interface testing device for wireless communication performance of Internet of things terminal |
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| CN202010323250.4A CN111541497A (en) | 2020-04-22 | 2020-04-22 | Air interface testing device for wireless communication performance of Internet of things terminal |
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Cited By (1)
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| CN113295934A (en) * | 2021-05-28 | 2021-08-24 | 中国信息通信研究院 | Device for signal testing |
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Application publication date: 20200814 |