CN106559145A - A kind of isolation between antennas test system and method for testing - Google Patents
A kind of isolation between antennas test system and method for testing Download PDFInfo
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- CN106559145A CN106559145A CN201510612481.6A CN201510612481A CN106559145A CN 106559145 A CN106559145 A CN 106559145A CN 201510612481 A CN201510612481 A CN 201510612481A CN 106559145 A CN106559145 A CN 106559145A
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Abstract
The invention discloses a kind of isolation between antennas test system and method for testing, its test system includes：Test mechanical platform, at least two antennas to be tested are installed on test mechanical platform；Radio frequency testing unit, is connected with least two antennas to be tested, for measuring multiple isolation between antennas values of at least two antennas to be tested in different relative positions；And, control unit, the first control end of control unit are connected with test mechanical platform, adjust the relative position of at least two antennas to be tested for controlling test mechanical platform according to default regulation rule.At least two antennas to be tested are installed on test mechanical platform, the relative position that test mechanical platform adjusts antenna to be tested is controlled by control unit, and isolation between antennas value of the antenna to be tested in different relative positions is measured by radio frequency testing unit, so as to obtain multigroup test data, testing efficiency is improve, planning is laid to antenna significant.
Description
Technical field
The present invention relates to wireless communication field, more particularly to a kind of isolation between antennas test system and test side
Method.
Background technology
With the fast development in wireless telecommunications market, the especially outburst of data service in recent years, to network
Cover and capacity requirement more and more higher.For this purpose, operator's input huge fund, deploys the nothing of a large amount of various standards
Gauze network, radius of society are also less and less, and the multiplexed situation of antenna mounting surface resource is also more and more；At this
In the case of kind, the antenna of the multiple systems of operator be possible to can cloth be placed on an antenna mounting surface, it is many
The antenna of multiple systems of individual operator is also possible to meeting cloth and is placed on an antenna mounting surface.
When different antennas, simultaneously cloth is placed on a steel tower or when on an antenna mounting surface, the pendulum of antenna
Put the requirement that should be able to meet isolation.And spacing, the antenna of the isolation and antenna between these antenna
Relative angle, the angle of pitch of antenna etc. factor have relation, lay offer foundation to provide antenna, because
This needs isolation when testing different relative positions between different system antenna.
The method of measurement isolation between antennas is mainly in microwave dark room, using vector network analyzer at present
The isolation of two antenna systems is directly tested, a passage can only be tested every time, a relative angle, one
Individual spacing, testing efficiency are low, it is difficult to meet testing requirement.
The content of the invention
The invention provides a kind of isolation between antennas test system and method for testing, solve in prior art
The less efficient problem of isolation between antennas method of testing.
According to one aspect of the present invention, there is provided a kind of isolation between antennas test system, including：
Test mechanical platform, at least two antennas to be tested are installed on test mechanical platform；
Radio frequency testing unit, is connected with least two antennas to be tested, for measuring at least two days to be tested
Multiple isolation between antennas values of the line in different relative positions；And,
Control unit, the first control end of control unit are connected with test mechanical platform, for controlling test machine
Tool platform adjusts the relative position of at least two antennas to be tested according to default regulation rule.
Wherein, radio frequency testing unit includes：
For gating the radio-frequency (RF) switch of at least two antenna different ports to be tested, radio-frequency (RF) switch includes multiple choosings
Go side mouth, wherein, port is one-to-one with the port of antenna to be tested connects for gating；Second control of control unit
End processed is connected with radio-frequency (RF) switch, for according to default gating rule, control radio-frequency (RF) switch gates every successively respectively
The a port of one antenna to be tested；
For measuring the test device of isolation between antennas, electrically connect with radio-frequency (RF) switch.
Wherein, control unit includes：
Control circuit, first outfan of first control end for control circuit, the second control end are control circuit
The second outfan；
For the current relative position according to default regulation rule adjustment at least two antennas to be tested of adjustment
Driving means, the first outfan of control circuit are connected with one end of driving means, the other end of driving means
It is connected with test mechanical platform.
Wherein, test mechanical platform includes：
Platform body；
Multiple mounting brackets, are fixed on platform body, and the first control end and the mounting bracket of control unit connect
Connect；Wherein, each antenna to be tested is installed in a mounting bracket；
Wherein, mounting bracket includes：
The first axle body on platform body surface is arranged at, the first axle body can slide along platform body surface；
The first pillar arranged perpendicular to the first axle body and the second pillar, one end of the first pillar and the second pillar
One end be individually fixed in the two ends of the first axle body；Wherein, the first pillar and the second pillar can extend along itself
Stretch in direction；And,
The other end of the second axle body be arrangeding in parallel with the first axle body, the other end of the first pillar and the second pillar
It is individually fixed in the two ends of the second axle body；Wherein, antenna to be tested is arranged on the second axle body, and the second axle
Body can be rotated along itself axial direction.
Wherein, the first control end includes：
First control terminal, is connected with the first axle body, for controlling the water of at least two antennas to be tested of adjustment
Flat distance；
Second control terminal, is connected with the first pillar and the second pillar, to be measured for controlling adjustment at least two
The vertical dimension of examination antenna and relative angle of declination；
3rd control terminal, is connected with the second axle body, for controlling the phase of at least two antennas to be tested of adjustment
To angle.
According to another aspect of the present invention, a kind of isolation between antennas method of testing is additionally provided, is applied to
Isolation test system between antenna as described above, wherein, the method for testing includes：
According to default regulation rule, the relative position of at least two antennas to be tested is adjusted；
Successively measure multiple antenna spacings of at least two antennas to be tested in different relative positions from
Angle value；
According to the relation of isolation threshold value between isolation between antennas value and default antenna, it is determined that for adjusting antenna
The reference relative position information for laying.
Wherein, measure successively between multiple antennas of at least two antennas to be tested in different relative positions
Isolation angle value, specifically includes：
Measure isolation between antennas value of at least two antennas to be tested at current relative position；
After relative position adjustment, the antenna for measuring at least two antennas to be tested in next relative position is isolated
Angle value.
Wherein, isolation between antennas value of at least two antennas to be tested at current relative position is measured, specifically
Including：
According to default gating rule, a port of each antenna to be tested is gated successively respectively；
Measure isolation between multiple first antennas of at least two antennas to be tested when different port is strobed
Value；
Be averaged angle value is isolated between the first antenna for measuring, at least two antennas to be tested are obtained current
The isolation between antennas value of relative position.
Wherein, the relation according to isolation threshold value between isolation between antennas value and default antenna, it is determined that for adjusting
The reference relative position information that all day, line laid, specifically includes：
If isolation between antennas value is more than or equal to isolation between default antenna, it is determined that current relative position is
For adjusting the reference relative position information that antenna lays.
Wherein, the relative position of at least two antennas to be tested according to default regulation rule, is adjusted, specially：
According to default regulation rule, the horizontal range of at least two antennas to be tested of adjustment, vertical dimension, phase
To one or more in angle of declination and relative flip angle.
The beneficial effect of embodiments of the invention is：
At least two antennas to be tested are installed on test mechanical platform, test machine is controlled by control unit
Tool platform adjusts the relative position of antenna to be tested, and measures antenna to be tested not by radio frequency testing unit
With isolation between antennas value during relative position, so as to obtain multigroup test data, testing efficiency is improve,
Planning is laid to antenna significant.
Description of the drawings
Fig. 1 represents the overall architecture schematic diagram of the isolation between antennas test system of the present invention；
Fig. 2 represents the structural representation of the isolation between antennas test system of the present invention；
Fig. 3 represents the schematic flow sheet of the isolation between antennas method of testing of the present invention.
Wherein in figure：1st, antenna to be tested, 2, test mechanical platform, 3, radio frequency testing unit, 4,
Control unit；
21st, platform body, 22, mounting bracket；221st, the first axle body, the 222, first pillar, 223,
Second pillar, 224, the second axle body；
31st, radio-frequency (RF) switch, 32, test device.
Specific embodiment
The exemplary embodiment of the present invention is more fully described below with reference to accompanying drawings.Although showing in accompanying drawing
The exemplary embodiment of the present invention, it being understood, however, that may be realized in various forms the present invention and should not be by
Embodiments set forth here is limited.On the contrary, there is provided these embodiments are able to be best understood from this
Invention, and the scope of the present invention complete can be conveyed to those skilled in the art.
Embodiment one
As shown in figure 1, The embodiment provides a kind of isolation between antennas test system, concrete to wrap
Include：Test mechanical platform 2, radio frequency testing unit 3 and control unit 4.Below in conjunction with concrete structure and
Annexation, is described in detail to above-mentioned part.
Test mechanical platform 2 is mainly used in carrying antenna to be tested 1, wherein, at least two antennas to be tested
1 is installed on test mechanical platform 2.
Radio frequency testing unit 3 is connected with antenna to be tested, for measuring at least two antennas to be tested in difference
The isolation between antennas value of relative position.
First control end of control unit 4 is connected with test mechanical platform 2, for controlling test mechanical platform
2 relative positions that antenna to be tested is adjusted according to default regulation rule.
Wherein, the regulating object of default regulation rule mentioned here is：Horizontal adjustment distance, vertical adjustment
One or more in distance, relative angle and gating port；Concrete regulation rule independently can set adjustment away from
From step footpath, the anglec of rotation or gating port rule.
Wherein, as depicted in figs. 1 and 2, radio frequency testing unit 3 includes：Radio-frequency (RF) switch 31 and test dress
Put 32.
Radio-frequency (RF) switch 31 includes multiple gating ports, each gating port port respectively with antenna to be tested
One-to-one connection.Second control end of control unit 4 is connected with radio-frequency (RF) switch 31, and radio-frequency (RF) switch 31 is in control
Under the control of unit processed 4, a port of each to be tested antenna is gated successively respectively.
Test device 32 is electrically connected with radio-frequency (RF) switch 31, and test device 32 is used to measure alternatively logical to be tested
Isolation between antennas between antenna port.
Wherein, control unit 4 is specifically included：Control circuit, and for according to default regulation rule adjustment
Adjust the driving means of the current relative position of at least two antennas to be tested 1；Wherein, control unit 4
The first control end for control circuit the first outfan, the second control end for control circuit the second outfan；
First outfan of control circuit is connected with one end of driving means, the other end and test mechanical of driving means
Platform 2 connects.Driving means drive test mechanical platform 2 in the presence of control circuit, to be measured to adjust
Relative position between examination antenna 1.
Wherein, the structure that implements of test mechanical platform 2 has various, and the present embodiment is only made with following structure
Illustrate for example, it is worthy of note that other can realize the knot for adjusting 1 relative position of antenna to be tested
Structure also can be used for in embodiments of the invention.Wherein test mechanical platform 2 is specifically included：Platform body
21 and multiple mounting brackets 22, wherein, mounting bracket 22 is fixed on platform body 1, control unit 4
The first control end be connected with mounting bracket 22；Wherein, each antenna to be tested 1 is installed on an installation
On support 22.
Specifically, mounting bracket 22 includes：
The first axle body 221 on 21 surface of platform body is arranged at, the first axle body 221 can be along platform body 21
Surface is slided, so the first axle body 221 is mainly used in the level of relative position for adjusting antenna to be tested 1；
The first pillar 222 arranged perpendicular to the first axle body 221 and the second pillar 223, the first pillar 222
One end and one end of the second pillar 223 be individually fixed in the two ends of the first axle body 221；Wherein, first
Post 222 and the second pillar 223 can be flexible along itself bearing of trend, the first pillar 222 and the second pillar 223
It is mainly used in adjusting the vertically opposite position of antenna to be tested 1 and relative angle of declination；Wherein, by the first pillar
222 with the height adjustment of the second pillar 223 to consistent, that is, keep 1 level of antenna to be tested, adjustment is different
The relative altitude of group mounting bracket 22, you can adjust the vertically opposite position of antenna to be tested 1；By first
The height adjustment of pillar 222 and the second pillar 223 to inconsistent, i.e., antenna 1 to be tested have it is certain under
Inclination angle, adjusts the difference in height between the first pillar 222 and the second pillar 223 as needed, you can simulation is treated
1 different angle of declinations of test antenna；And,
The second axle body 224 be arrangeding in parallel with the first axle body 221, the other end and second of the first pillar 222
The other end of pillar 223 is individually fixed in the two ends of the second axle body 224；Wherein, antenna to be tested 1 wears
On the second axle body 224, and the second axle body 224 can be rotated along itself axial direction, be mainly used in adjustment not
With the relative angle between antenna to be tested 1.
Wherein, the first control end is connected with mounting bracket 22, is mainly used in the control adjustment of mounting bracket 22 and is treated
The relative position of test antenna 1, implements and can refer to following manner, wherein the first control end includes：
First control terminal, is connected with the first axle body 221, for controlling at least two antennas to be tested of adjustment
1 horizontal range；
Second control terminal, is connected with the first pillar 222 and the second pillar 223, for controlling adjustment at least
The vertical dimension of two antennas to be tested 1 and relative angle of declination；
3rd control terminal, is connected with the second axle body 224, for controlling at least two antennas to be tested of adjustment
221 relative angle.
To sum up, at least two antennas to be tested are installed on survey by isolation between antennas test system of the invention
On examination mechanical platform, the relative position that test mechanical platform adjusts antenna to be tested is controlled by control unit,
And isolation between antennas value of the antenna to be tested in different relative positions is measured by radio frequency testing unit,
So as to obtain multigroup test data, testing efficiency is improve, planning is laid to antenna significant.
Embodiment two
Above example one describes the overall architecture of isolation between antennas test system, below in conjunction with concrete
Application scenarios are made into one to the isolation between antennas method of testing for being applied to the isolation between antennas test system
Step description.
As shown in figure 3, the isolation between antennas method of testing is specifically included：
Step S31：According to default regulation rule, the relative position of at least two antennas to be tested is adjusted.
Step S31 referred to herein is specifically included：According to default regulation rule, at least two are adjusted to be tested
One or more in the horizontal range of antenna, vertical dimension or relative angle.
Wherein, the regulating object of default regulation rule mentioned here is：Horizontal adjustment distance, vertical adjustment
One or more in distance, relative angle and gating port；Concrete regulation rule independently can set adjustment away from
From step footpath, the anglec of rotation or gating port rule.
Step S32：Multiple days of at least two antennas to be tested in different relative positions are measured successively
Isolate angle value between line.
Wherein, step S32 is specifically included：
At least two antennas to be tested are measured after the isolation between antennas value at current relative position, measurement is at least
Isolation between antennas value of two antennas to be tested in next relative position.
Here it is to say, after a relative position of antenna to be tested is adjusted, measures antenna to be tested and be in
Isolation between antennas when at current relative position are simultaneously recorded, then according to default regulation rule, adjust automatically
The next relative position of antenna to be tested, and isolation between antennas value is measured again, until in not homophase
The isolation between antennas of position are all measured.
Step S33：According to the relation of isolation threshold value between isolation between antennas value and default antenna, it is determined that using
In the reference relative position information that adjustment antenna lays.
From multiple measurement data obtained above, selection is met isolation between antennas value and is spaced with default antenna
From the data message of the relative position of degree threshold value relation, as the reference relative position information that adjustment antenna lays.
Wherein, between default antenna mentioned here, isolation threshold value refers to normal work is ensure that between antenna, does
Disturbing affects minimum isolation angle value.
In order to ensure the accuracy and effectiveness of each isolation between antennas value for measuring, its measuring process is concrete
Including：
According to default gating rule, a port of each antenna to be tested is gated successively respectively；Communicate at present
The antenna used by field is generally multi-port antenna, when isolation between antennas value is measured, once need to gate
A port is measured.
Measure isolation between multiple first antennas of at least two antennas to be tested when different port is strobed
Value；The different port of gating, measured isolation between antennas value are different, so that measurement different port
Whole isolation between antennas values under strobe case.
Be averaged angle value is isolated between the first antenna for measuring, at least two antennas to be tested are obtained current
The isolation between antennas value of relative position.
Wherein, the relation according to isolation threshold value between isolation between antennas value and default antenna, it is determined that for adjusting
The reference relative position information that all day, line laid, specifically includes：
If isolation between antennas value is more than or equal to isolation between default antenna, it is determined that current relative position is
For adjusting the reference relative position information that antenna lays.Here it is to say
In or be equal to default antenna between isolation, multiple antennas could be met and be installed on laying for an antenna mounting surface
Require, therefore the isolation between antennas value that measurement is obtained is more than or equal to isolation threshold value institute between default antenna
The reference information that corresponding relative position parameter information is laid as antenna.
Isolation between antennas test system described in one, at least two antennas to be tested are installed in conjunction with the embodiments
On test mechanical platform, the relative position that test mechanical platform adjusts antenna to be tested is controlled by control unit
Put, and isolation between antennas of the antenna to be tested in different relative positions are measured by radio frequency testing unit
Value, so as to obtain multigroup test data, improves testing efficiency, planning is laid to antenna significant.
Embodiment three
Above example once and the isolation between antennas test system respectively of embodiment two overall architecture and day
Between line, the specific implementation step of isolation method of testing has been described in detail, below will be with practical application scene
The present invention is described further, to test 2 port day of FDD LTE (frequency multiplexing technique) standard
Line is with 8 port smart antenna of TD-LTE (time-division multiplex technology) standard under which kind of spacing and relative angle
As a example by the test process of 50dB insulated degree requirements can be met.
Step 1：Two antennas to be tested are fixed in the mounting bracket of test mechanical platform, and related
Connection is good.Wherein, the gating port of radio-frequency (RF) switch is connected with two ports of FDD LTE respectively,
And eight port connections of TD-LTE；Radio-frequency (RF) switch is connected with test device；First control of control unit
End processed is connected with the mounting bracket of test mechanical platform by drive circuit, the second control end of control unit with
Radio-frequency (RF) switch connects.
Step 2：The initial position of two antennas to be tested of setting, the relative angle of two antennas is 0 degree, is hung down
Straight distance is 0 meter, and horizontal range is 0.5 meter.That is, the relative angle between the second axle body be 0 degree, first
Intercolumniation and second intercolumniation it is highly identical；Spacing between the first axle body is 0.5 meter.
Step 3：Under the control of the control unit, radio-frequency (RF) switch gates the port Port1 of FDD LTE antennas
With the port Port1 ' of TD-LTE antennas.
Step 4：Test device measures isolation between antennas value of two antennas in the relative position.
Step 5：FDD antenna port1, port2, TDD antenna port1 '～port8 ' are gated successively, and
Isolation between antennas value of two antennas in the relative position is measured successively.FDD days can be tested out so
The isolation angle value that any combines between 8 mouths of 2 mouths of line and TDD antennas, then enters to this value
Row is average, you can obtain in such cases, isolation degree between two antennas value.
Step 6：According to the step footpath of 0.5m, the level interval between antenna to be tested is adjusted from 1m～10m,
Distance between the first axle body is adjusted from 1m～10m.And successively execution step 3 to step 5.
Step 7：According to 0.5 step footpath, vertical interval between antenna to be tested is adjusted from 1m～10m, i.e.,
The height distance of first intercolumniation of adjustment and second intercolumniation is from 1m～10m.And execution step 6.
Step 8：Adjust the height distance between the second pillar and the first pillar so that antenna modeling to be tested
Angle of declination, concrete adjustment distance are adjusted according to the step footpath that inclination angle is 1 degree, and execution step 7.
Step 9：According to 10 degree of step footpath rotation the second axle body, to adjust the relative upset between two antennas
Angle, and execution step 8.
So, you can the isolation between antennas of whole relative positions are all measured, from measurement data
It is middle to choose more than the relative position corresponding to 50dB isolations, and in this, as the reference for instructing antenna to lay
Information.
Above-described is the preferred embodiment of the present invention, it should be pointed out that for the ordinary people of the art
For member, some improvements and modifications can also be made under the premise of without departing from principle of the present invention, these
Improvements and modifications are also within the scope of the present invention.
Claims (10)
1. a kind of isolation between antennas test system, it is characterised in that include：
Test mechanical platform, at least two antennas to be tested are installed on the test mechanical platform；
Radio frequency testing unit, is connected with described at least two antennas to be tested, for measuring described at least two
Multiple isolation between antennas values of the antenna to be tested in different relative positions；And,
Control unit, the first control end of described control unit are connected with the test mechanical platform, for controlling
Make the test mechanical platform the relative of at least two antenna to be tested is adjusted according to default regulation rule
Position.
2. isolation between antennas test system according to claim 1, it is characterised in that described to penetrate
Frequency test cell includes：
Radio-frequency (RF) switch, the radio-frequency (RF) switch include multiple gating ports, wherein, the gating port with it is to be measured
The one-to-one connection in port of examination antenna；Second control end of described control unit is connected with the radio-frequency (RF) switch,
For according to default gating rule, controlling the radio-frequency (RF) switch and gating the one of each antenna to be tested successively respectively
Individual port；
For measuring the test device of isolation between antennas, electrically connect with the radio-frequency (RF) switch.
3. isolation between antennas test system according to claim 2, it is characterised in that the control
Unit processed includes：
Control circuit, first control end are the first outfan of the control circuit, second control
Hold the second outfan for the control circuit；
For the current relative position according to default regulation rule adjustment adjustment at least two antenna to be tested
The driving means put, the first outfan of the control circuit are connected with one end of the driving means, described
The other end of driving means is connected with the test mechanical platform.
4. isolation between antennas test system according to claim 2, it is characterised in that the survey
Examination mechanical platform includes：
Platform body；
Multiple mounting brackets, are fixed on the platform body, the first control end of described control unit and institute
State mounting bracket connection；Wherein, each antenna to be tested is installed in a mounting bracket；
Wherein, the mounting bracket includes：
The first axle body on the platform body surface is arranged at, the first axle body can be along the platform body table
Slide in face；
Perpendicular to the first axle body arrange the first pillar and the second pillar, one end of first pillar and
One end of second pillar is individually fixed in the two ends of the first axle body；Wherein, first pillar and
Second pillar can be flexible along itself bearing of trend；And,
The second axle body be arrangeding in parallel with the first axle body, the other end of first pillar and described second
The other end of pillar is individually fixed in the two ends of the second axle body；Wherein, antenna to be tested is arranged in described
On the second axle body, and the second axle body can be rotated along itself axial direction.
5. isolation between antennas test system according to claim 4, it is characterised in that described
One control end includes：
First control terminal, is connected with the first axle body, adjusts described at least two for control to be tested
The horizontal range of antenna；
Second control terminal, is connected with first pillar and second pillar, described for controlling adjustment
The vertical dimension of at least two antennas to be tested and relative angle of declination；
3rd control terminal, is connected with the second axle body, adjusts described at least two for control to be tested
The relative angle of antenna.
6. a kind of isolation between antennas method of testing, is applied to the antenna as described in any one of Claims 1 to 5
Between isolation test system, it is characterised in that methods described includes：
According to default regulation rule, the relative position of at least two antenna to be tested is adjusted；
Successively measure multiple antenna spacings of at least two antennas to be tested in different relative positions from
Angle value；
According to the relation of isolation threshold value between the isolation between antennas value and default antenna, it is determined that for adjusting
The reference relative position information that antenna lays.
7. isolation between antennas method of testing according to claim 6, it is characterised in that survey successively
Multiple isolation between antennas values of at least two antennas to be tested in different relative positions are measured, it is concrete to wrap
Include：
Measure isolation between antennas value of described at least two antennas to be tested at current relative position；
After relative position adjustment, antenna of at least two antenna to be tested in next relative position is measured
Isolation angle value.
8. isolation between antennas method of testing according to claim 7, it is characterised in that measurement institute
Isolation between antennas value of at least two antennas to be tested at current relative position is stated, is specifically included：
According to default gating rule, a port of each antenna to be tested is gated successively respectively；
Measure multiple first antenna intervals of described at least two antennas to be tested when different port is strobed
From angle value；
It is averaged angle value is isolated between the first antenna for measuring, obtains described at least two days to be tested
Isolation between antennas value of the line at the current relative position.
9. isolation between antennas method of testing according to claim 6, it is characterised in that according to institute
The relation of isolation threshold value between isolation between antennas value and default antenna is stated, it is determined that for adjusting what antenna laid
With reference to relative position information, specifically include：
If the isolation between antennas value is more than or equal to isolation between the default antenna, it is determined that described to work as
Front relative position is for adjusting the reference relative position information that antenna lays.
10. isolation between antennas method of testing according to claim 6, it is characterised in that according to pre-
If regulation rule, the relative position of at least two antennas to be tested is adjusted, specially：
According to default regulation rule, adjust the horizontal range of at least two antenna to be tested, vertical dimension,
With respect to one or more in angle of declination and relative flip angle.
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Cited By (5)
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| CN110072014A (en) * | 2019-05-20 | 2019-07-30 | 维沃移动通信有限公司 | A kind of screen folded state determines method and mobile terminal |
| CN111371515A (en) * | 2020-03-12 | 2020-07-03 | 电子科技大学 | Equivalent test method for isolation between base station antennas |
| CN112449353A (en) * | 2019-09-05 | 2021-03-05 | 丽水青达科技合伙企业(有限合伙) | Indoor deployment method |
| CN113037397A (en) * | 2021-03-02 | 2021-06-25 | 苏州天希电子科技有限公司 | 5G antenna interface board port isolation measurement system |
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