CN106291145B - The test macro of wireless terminal - Google Patents
The test macro of wireless terminal Download PDFInfo
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- CN106291145B CN106291145B CN201510239297.1A CN201510239297A CN106291145B CN 106291145 B CN106291145 B CN 106291145B CN 201510239297 A CN201510239297 A CN 201510239297A CN 106291145 B CN106291145 B CN 106291145B
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Abstract
本发明公开了一种无线终端的测试系统，包括：被测件，被测件为无线终端；屏蔽箱体；反射面，反射面设置在屏蔽箱体的内壁，反射面用于对被测件发送的无线信号进行聚焦全反射，其中，反射面为椭球形反射面，反射面所组成的椭球面具有第一焦点和第二焦点，被测件设置在第一焦点上；测量天线，测量天线设置在第二焦点上；以及测量装置，测量装置通过连接电缆与测量天线连接，测量装置用于检测测量天线接收的无线信号的功率之和。该系统具有测试空间体积小、测试结果重复性误差小、测试结果稳定、测试效率高等优点，尤其适用于无线终端性能在生产线的快速通信性能检测。
The invention discloses a testing system for a wireless terminal, comprising: a tested part, which is a wireless terminal; a shielding box; The transmitted wireless signal is subjected to focused total reflection, wherein the reflective surface is an ellipsoid reflective surface, the ellipsoid formed by the reflective surface has a first focus and a second focus, and the DUT is set on the first focus; the measurement antenna, the measurement antenna set on the second focus; and a measuring device, the measuring device is connected with the measuring antenna through a connecting cable, and the measuring device is used for detecting the sum of the powers of the wireless signals received by the measuring antenna. The system has the advantages of small test space, small repeatability error of test results, stable test results, and high test efficiency, and is especially suitable for fast communication performance detection of wireless terminal performance in production lines.
Description
Technical field
The present invention relates to the field of test technology more particularly to a kind of test macros of wireless terminal.
Background technique
Currently, the product (such as mobile phone, tablet computer) of wireless terminal has become the important need of people's life.Intelligence
Wireless terminal is just entering each link of people's daily routines at a terrific speed.And the mass production of these wireless terminals
It needs effective radio-frequency measurement device to make rapid survey to its radiance, can just produce end product with guaranteeing both quality and quantity.It measures
The main representative index of wireless terminal product communication performance is total radiant power and receiver total sensitivity.Measure the two performances
Refer to that calibration method can only be by making actinometry to finished parts terminal.
The antenna of mobile radio-communications terminal is not usually directional aerial, but has radiation to space all directions and connect
Performance is received to guarantee to keep wireless communication with communication base station as much as possible nearby.According to CTIA (U.S.'s wireless communication and interconnection
Net association) testing standard, the test definition that the wireless performance of wireless terminal is carried out is OTA (Over-The-Air, vacant terminal
Port communications performance) test.The basic ideas of OTA test are by measuring the energy radiated from wireless terminal in different solid angles
It measures to measure the total radiant power TRP (Total Radiated Power) of terminal；Simultaneously by being measured in different solid angles
Terminal receiving sensitivity determine total receiving sensitivity TIS (Total Isotropic Sensitivity) of terminal.
It in the related technology, is a kind of test macro of existing wireless terminal as shown in Fig. 1 (a), the test macro is main
The OTA measurement to wireless terminal is realized by great circle patterning method, specific implementation can be as follows: by measured piece (i.e. wireless terminal)
It is placed in the center of a dimensional turntable, measured piece (can respectively correspond spherical coordinates around 2 rotation axis rotations with turntable
The angle θ and the angle φ), antenna is measured using a quadrature dualpolarized, measured piece and measurement antenna are arranged at shielding electromagnetic wave darkroom
In, the direct signal of measured piece towards measurement antenna is measured antenna and receives, and dark by microwave to the radiation signal in other directions
The absorbing material of indoor placement absorbs.Its test process is as follows: the angle θ turns to 180 ° from 0 °, and interval is 15 °；The angle φ turns from 0 °
It moves to 360 °, interval is also 15 °；Specific rotating manner is, when θ is 0 °, the angle φ ° is rotated from 0 ° to 360 with 15 ° of interval,
As soon as often turning to a position, stops and carry out the measurement of direction signal strength；Then the angle θ goes to 15 °, and the angle φ is still from 0 °
It is rotated to 360 ° with 15 ° of intervals, often turns to a position and just stop and carry out the test of signal strength；And so on, θ is each
A position, the angle φ all rotate 360 °；266 positions are amounted in this way.Two cross-polarized antennas want point of each measurement solid angle
It Zuo not measure for 2 times；Therefore add up to 532 measurement data points.This 532 measurement data from different directions is made into surface integral,
It can obtain the total radiant power TRP that measured piece is radiated to free space.
If doing sensitivity measure, in order to reduce time of measuring, then the angle θ and the angle φ rotation interval are 30 °, overall measurement orientation
It is 62.The sensitivity threshold of terminal receiver is searched in two polarization of measuring system in all directions respectively, also passes through spherical surface
Integral can obtain total receiving sensitivity TIS of wireless terminal.
As shown in Fig. 1 (b), for the test macro of another existing wireless terminal, which mainly passes through circular cone
Patterning method realizes that specific implementation can be as follows: in the angular direction θ of spherical coordinates according to 15 ° of spacing to the OTA of wireless terminal measurement
Multiple quadrature dualpolarized measurement antennas (shown in such as Fig. 1 (b)) are laid, and the φ angular range of spherical coordinates is then completed by turntable.It is surveyed
Examination process is as follows: during the angle φ is from 0 ° of stepping for turning to 360 °, measuring system is successively directed toward the every of the angle θ with electronic switch
One probe antenna makees the measurement of direction signal strength or sensitivity.When the same orientation of completion, the acquisition of polarization measurement point data
Afterwards, by surface integral data processing, so that it may show that total radiant power TRP that wireless terminal is radiated to free space or terminal connect
Receipts machine global radiation sensitivity TIS.
But presently, there are the problem of be: the measuring speed of above-mentioned common two kinds of test methods is slow, and due to requiring
The distance between probe and measured piece need to be greater than far field distance, be typically larger than 2 meters, so that the volume of measuring system is excessively huge
Greatly, manufacturing cost is high, is not suitable for Quality Detection when wireless terminal scale of mass production.
Summary of the invention
The present invention is directed to solve above-mentioned one of technical problem at least to a certain extent.
For this purpose, an object of the present invention is to provide a kind of test macros of wireless terminal.The system has test empty
Between it is small in size, test result repeatability error is small, test result is stable, testing efficiency is high the advantages that.
To achieve the goals above, the test macro of the wireless terminal of one aspect of the present invention embodiment, comprising: measured piece,
The measured piece is wireless terminal；Shielding case body；Reflecting surface, the inner wall of the shielding case body is arranged in the reflecting surface, described
The wireless signal that reflecting surface is used to send the measured piece is focused total reflection, wherein the reflecting surface is that elliposoidal is anti-
Face is penetrated, ellipsoid composed by the reflecting surface has the first focus and the second focus, and the measured piece is arranged described first
In focus；Antenna is measured, the measurement antenna is arranged in second focus；And measuring device, the measuring device are logical
It crosses connecting cable to connect with the measurement antenna, the measuring device is used to detect the measurement received wireless signal of antenna
The sum of power.
The test macro of wireless terminal according to an embodiment of the present invention is emitted measured piece by elliposoidal reflecting surface more
The radiation signal in a direction converges to measurement antenna, and the radiation signal of multiple directions is made to reach same phase phase at measurement antenna
Superposition, power combing, so as to once measure the sum of the power for the multiple directions radiation signal that measured piece emits, operation letter
Single, testing efficiency is high, and has many advantages, such as that the test space is small in size, test result repeatability error is small, test result is stablized, especially
It is suitable for wireless terminal performance production line high-speed traffic performance detection.
According to one embodiment of present invention, test macro further include: two suction wave screens, described two suction wave screen difference
The viscous top surface up and down for being placed on the elliposoidal reflecting surface, so that the reflecting surface becomes flat-top ellipsoid reflecting surface.
Wherein, in one embodiment of the invention, the suction wave screen is that plate inhales wave cotton.
In another embodiment of the present invention, the suction wave screen is that pyramid inhales wave cotton.
According to one embodiment of present invention, the test macro further include: controller, the controller are tested with described
Part connection sends the wireless signal for controlling the measured piece.
In an embodiment of the present invention, the controller and the measuring device are located at outside the shielding case body.
According to one embodiment of present invention, the test macro further include: fixture, for fixing the measured piece.?
In the embodiment of the present invention, the principal direction that the controller is also used to the wireless signal transmitted by the measured piece is the suction
When direction where wave screen, the angle that the fixture adjusts the measured piece is controlled.
According to one embodiment of present invention, first focus and the second focus and the flat-top ellipsoid reflecting surface away from
From 1/4 wavelength when being in least significant end working frequency for the measured piece.
Wherein, in one embodiment of the invention, the shape of the shielding case body is elliposoidal.
Wherein, in one embodiment of the invention, the material of the reflecting surface is made of metal material.Wherein, metal
Material can be the preferable metal of conductivity.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, wherein
Fig. 1 (a) is a kind of schematic diagram of the test macro of existing wireless terminal；
Fig. 1 (b) is the schematic diagram of the test macro of another existing wireless terminal；
Fig. 2 is the structural schematic diagram of the test macro of wireless terminal according to an embodiment of the invention；
Fig. 3 is the structural schematic diagram of the test macro of wireless terminal in accordance with another embodiment of the present invention；
Fig. 4 is the structural schematic diagram of the test macro of the wireless terminal of another embodiment according to the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the test macro of wireless terminal according to an embodiment of the present invention is described.
Fig. 2 is the structural schematic diagram of the test macro of wireless terminal according to an embodiment of the invention.As shown in Fig. 2,
The test macro of the wireless terminal may include: measured piece 10, shielding case body 20 (being not shown in Fig. 2), reflecting surface 30, measurement day
Line 40 and measuring device 50.Wherein, in an embodiment of the present invention, measured piece 10 can be wireless terminal, and wireless terminal can be
Mobile phone, tablet computer, personal digital assistant etc. have the hardware device of various operating systems.In addition, the shape of shielding case body 20
It can be elliposoidal.
As shown in Fig. 2, inner wall of the setting of reflecting surface 30 in shielding case body 20 (being not shown in Fig. 2), reflecting surface 30 can be used for
The wireless signal sent to measured piece 10 is focused total reflection.Wherein, in an embodiment of the present invention, reflecting surface 30 is ellipsoid
Shape reflecting surface, ellipsoid composed by reflecting surface 30 have the first focus 31 and the second focus 32, the setting of measured piece 10 this
In one focus 31, measurement antenna 40 is arranged in the second focus 32.In addition, in an embodiment of the present invention, reflecting surface 30 can be by
Metal material is made, and metal material can be conductivity preferable metal, such as copper, aluminium etc..It should be noted that measured piece 10
It is not limited in the first focus 31 and the second focus 32 with the placement location of measurement antenna 40.That is, measured piece 10
It may be provided in the second focus 32, measurement antenna 40 is arranged in the first focus 31, as long as by measured piece 10 and measurement antenna 40
It is separately positioned in the two focuses.
Measuring device 50 can be connect by connecting cable C with measurement antenna 40, and measuring device 50 can be used for detecting measurement day
The sum of the power of the received wireless signal of line 40.
Further, in one embodiment of the invention, as shown in Fig. 2, the test macro of the wireless terminal can also wrap
Controller 60 is included, controller 60 is connect with measured piece 10, and controller 60 can be used for controlling the wireless signal of the transmission of measured piece 10.?
In the embodiment of the present invention, controller 60 can be located separately the outside of shielding case body 20 (being not shown in Fig. 2) with measuring device 50.
More specifically, shielding case body 20 can be used for shielding extraneous Electromagnetic Interference, shielding case body 20 (is not shown) in Fig. 2
Inner surface constitutes an ellipsoid, in specific embodiment, the ellipsoid can metallize, elliposoidal reflecting surface can be obtained
30.The elliposoidal reflecting surface 30 can form two focuses in the cavity, and the energy emitted in principle from a focus is through elliposoidal
Reflecting surface 30 will be focused onto another focus after reflecting.Therefore, measurement antenna 40 is arranged in a focus (such as second
Focus 32) on, and measured piece 10 is placed in another focus (such as the first focus 10)；As shown in Fig. 2, this set can be most
Expeditiously the electromagnetic wave energy that measured piece 10 emits is focused on the measurement antenna 40 of the second focus 32, then by measuring
Antenna 40 and measuring device 50 constitute effective communication link.
The principle of the test macro of the embodiment of the present invention is further illustrated below.
As shown in Fig. 2, the electromagnetic wave signal emitted from measured piece 10 is by elliposoidal according to the definition and property of ellipsoid
The reflection of reflecting surface 30 can be incident on where another focus measurement antenna 40, and according to the physics of ellipsoid reflecting surface original
Reason, all multipath electromagnetic wave signals emitted from different directions from measured piece 10 enter after the reflection of elliposoidal reflecting surface 30
Be mapped to measurement antenna 40 diffusion path length it is identical, thus phase difference caused by propagation path be it is identical, therefore, from one
Multiple signals that focus issues can be realized substantially by reflecting, converging to another focal point and focus received in-phase stacking
Power combing purpose.Again since the measured piece 10 for being located at the first focus 31 has certain EDS maps, through elliposoidal reflecting surface
Energy after 30 reflections is concentrated in the transversal plane around the second focus 32, therefore receiving measurement antenna 40 needs certain face
Distribution could more effectively receive the electromagnetic wave energy of convergence.
It should be noted that since the presence backwards to metal mirror 30 will lead to the day of measurement antenna 40 and measured piece 10
Line mismatch.In order to reduce the negative effect for measuring not accuracy brought by this effect, further, in a reality of the invention
It applies in example, such as Fig. 3 and as shown in figure 4, the test macro may also include two suction wave screens 70, two suction wave screens 70 are glued respectively to be placed on
Reflecting surface 30 is modified and is made a variation so that reflecting surface 30 becomes flat-top ellipsoid reflecting surface in the top surface up and down of elliposoidal reflecting surface 30
At band, there are two the part ellipsoidal shape reflectings surface for inhaling wave screen.Wherein, in one embodiment of the invention, as shown in figure 3, two
Wave cotton can be inhaled for plate by inhaling wave screen 70, and plate, which inhales wave cotton, to be made of sheet absorbing material.In another embodiment of the invention
In, as shown in figure 4, two suction wave screens 70 can inhale wave cotton for pyramid, pyramid, which inhales wave cotton, to be made of cone cell absorbing material.As a result,
The measurement reproducibility of measurement cavity can be improved by inhaling wave screen 70.
It should be noted that Fig. 3 and Fig. 4 show the part-ellipsoids measuring system of flat-top elliposoidal reflecting surface composition
Schematic diagram.Both design focus (i.e. the first focus 31 and the second focus 32) and with inhale wave screen 70 reflecting surface 30 (i.e.
Above-mentioned flat-top ellipsoid reflecting surface) 1/4 wavelength of distance when be in least significant end working frequency range with measured piece 10 as far as possible be to design
Guide, to guarantee that direct wave and back wave are in-phase stackings when low side working frequency absorbing property is bad.
Thus, it is possible to find out, measuring system proposed by the invention is when measuring measured piece 10, according to tested
The measured piece 10 for being located at a near focal point is converged to another coke in the radiation signal of multiple directions by the requirement that part 10 is tested
Measurement antenna 40 near point；Again because the characteristic of elliposoidal reflecting surface 30 is utilized, the radiation signal of multiple directions is being measured
It can reach superposition, the power combing of same phase phase at antenna 40, so as to once measure the multiple direction radiation signal
The sum of power.However, if used conventional methods, it is necessary to the radiation signal in each direction will be measured, then by measurement
As a result data processing, power addition are carried out, the time of measuring taken may be more than 500 times or more than 120 times.
It should be noted that when being measured using measuring system as shown in Figure 3 or Figure 4, due to upper and lower ellipsoid top
Face, which is scabbled and is added to, inhales wave screen 70, if the radiation energy principal direction of measured piece 10 is handled towards suction wave screen 70
Reflecting surface is largely absorbed, when the energy that measured piece 10 is focused becomes the fraction of gross energy, the spirit of measuring system
Sensitivity and accuracy will will receive bigger influence.In order to improve the measurement accuracy of this specific measured piece 10, in the present invention
One embodiment in, which may also include fixture (not shown), and fixture can be used for fixing measured piece 10.At this
In the embodiment of invention, controller 60 can also be used in the principal direction of the wireless signal transmitted by measured piece 10 to inhale 70 institute of wave screen
Direction when, control fixture adjustment measured piece 10 angle, such as stir measured piece 10.
It is appreciated that being reciprocity due to receiving, emitting, so foregoing description is also applied for 10 receptivity of measured piece
Test, details are not described herein.
The test macro of wireless terminal according to an embodiment of the present invention is emitted measured piece by elliposoidal reflecting surface more
The radiation signal in a direction converges to measurement antenna, and the radiation signal of multiple directions is made to reach same phase phase at measurement antenna
Superposition, power combing, so as to once measure the sum of the power for the multiple directions radiation signal that measured piece emits, operation letter
Single, testing efficiency is high, and has many advantages, such as that the test space is small in size, test result repeatability error is small, test result is stablized, especially
It is suitable for wireless terminal performance production line high-speed traffic performance detection.
In the description of the present invention, it is to be understood that, term " on ", "lower", "top", "inner", "outside", " axial direction ", " diameter
To " etc. instructions orientation or positional relationship be based on the orientation or positional relationship shown in the drawings, be merely for convenience of describing this hair
Bright and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation
Construction and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (9)
1. a kind of test macro of wireless terminal characterized by comprising
Measured piece, the measured piece are wireless terminal；
Shielding case body；
The inner wall of the shielding case body is arranged in reflecting surface, the reflecting surface, and the reflecting surface is used to send the measured piece
Wireless signal be focused total reflection, wherein the reflecting surface is elliposoidal reflecting surface, ellipsoid composed by the reflecting surface
Face has the first focus and the second focus, and the measured piece is arranged in first focus；
Antenna is measured, the measurement antenna is arranged in second focus；And
Measuring device, the measuring device are connect by connecting cable with the measurement antenna, and the measuring device is for detecting
The sum of the power of the measurement received wireless signal of antenna；
Two suction wave screens, described two wave screens of inhaling glue the top surface up and down for being placed on the elliposoidal reflecting surface respectively, so that described anti-
Face is penetrated as flat-top ellipsoid reflecting surface.
2. the test macro of wireless terminal as described in claim 1, which is characterized in that wherein, the suction wave screen is plate suction
Wave cotton.
3. the test macro of wireless terminal as described in claim 1, which is characterized in that wherein, the suction wave screen is pyramid suction
Wave cotton.
4. the test macro of wireless terminal as described in claim 1, which is characterized in that further include:
Controller, the controller are connect with the measured piece, send the wireless signal for controlling the measured piece.
5. the test macro of wireless terminal as claimed in claim 4, which is characterized in that the controller and the measuring device
It is located at outside the shielding case body.
6. the test macro of wireless terminal as claimed in claim 4, which is characterized in that further include:
Fixture, for fixing the measured piece；
The principal direction that the controller is also used to the wireless signal transmitted by the measured piece is the side inhaled where wave screen
Xiang Shi controls the angle that the fixture adjusts the measured piece.
7. the test macro of wireless terminal as described in claim 1, which is characterized in that first focus and the second focus with
The distance of the flat-top ellipsoid reflecting surface is 1/4 wavelength when the measured piece is in least significant end working frequency.
8. the test macro of wireless terminal as described in claim 1, which is characterized in that wherein, the shape of the shielding case body
For elliposoidal.
9. the test macro of wireless terminal as described in claim 1, which is characterized in that wherein, the reflecting surface is by metal material
Material is made.
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| CN201510239297.1A CN106291145B (en) | 2015-05-12 | 2015-05-12 | The test macro of wireless terminal |
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| CN201510239297.1A CN106291145B (en) | 2015-05-12 | 2015-05-12 | The test macro of wireless terminal |
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| CN106291145B true CN106291145B (en) | 2019-03-01 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108574608A (en) * | 2017-03-13 | 2018-09-25 | 深圳市新益技术有限公司 | A wireless communication throughput test system and method based on MIMO |
| CN110391855B (en) * | 2018-04-17 | 2022-12-30 | 罗德施瓦兹两合股份有限公司 | Measuring system and method for operating a measuring system |
| CN109358215B (en) * | 2018-09-04 | 2024-03-26 | 广州市诚臻电子科技有限公司 | Shielding room of rotary replacement detection table |
| CN112397863B (en) * | 2019-08-16 | 2022-02-22 | 稜研科技股份有限公司 | Switching structure for millimeter wave and multilayer switching structure |
| EP3796008B1 (en) * | 2019-09-17 | 2023-07-26 | Rohde & Schwarz GmbH & Co. KG | System and method for parallel measurement of devices under test in an open over the air environment |
| WO2022036545A1 (en) * | 2020-08-18 | 2022-02-24 | Qualcomm Incorporated | Total radiated power tests for transmit diversity |
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| JP5577300B2 (en) * | 2011-07-14 | 2014-08-20 | アンリツ株式会社 | Method and apparatus for measuring antenna reflection loss of wireless terminal |
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| US4931798A (en) * | 1987-06-03 | 1990-06-05 | Tokin Corporation | Electromagnetic anechoic chamber with an inner electromagnetic wave reflection surface and an electromagnetic wave absorption small ball disposed in the chamber |
| CN101802625A (en) * | 2007-09-28 | 2010-08-11 | 安立股份有限公司 | Radiated power measuring method, coupler for radiate power measurement, and radiated power measuring device |
| CN103812586A (en) * | 2012-11-13 | 2014-05-21 | 深圳市鼎立方无线技术有限公司 | Measuring system |
| CN103856272A (en) * | 2012-12-03 | 2014-06-11 | 深圳市通用测试系统有限公司 | Method of testing wireless performance of MIMO wireless terminal |
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