CN108710035A - A kind of method and apparatus improving reverberation chamber uniformity - Google Patents
A kind of method and apparatus improving reverberation chamber uniformity Download PDFInfo
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- CN108710035A CN108710035A CN201810167800.0A CN201810167800A CN108710035A CN 108710035 A CN108710035 A CN 108710035A CN 201810167800 A CN201810167800 A CN 201810167800A CN 108710035 A CN108710035 A CN 108710035A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
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Abstract
The invention discloses a kind of method and apparatus improving reverberation chamber uniformity, solve the problems, such as that existing method improvement factor is single, improvement is poor.The method includes the following steps：By two-way analysis of variance method, to influencing two factors of reverberation chamber field uniform properties, stirring blade length-width ratio, stirring blade angle carry out modeling analysis, and determining influences that big factor is the first factor, to influence small factor be the second factor；First factor is optimized, the first factors optimization value is obtained；On the basis of the first factors optimization value, second factor is optimized, obtains the second factors optimization value；Determine the optimal design value for being combined as the reverberation chamber of the first, second factors optimization value.The present invention can be generalized in the reverberation chamber design of other sizes, and the optimization design for reverberation chamber blender provides foundation, to realize the purpose for improving reverberation chamber field uniformity.
Description
Technical field
The present invention relates to field of electromagnetic compatibility more particularly to a kind of method and apparatus improving reverberation chamber uniformity.
Background technology
Field uniformity is one of most important performance parameter of reverberation chamber, and the quality of reverberation chamber field uniformity influences whether to survey
The consistency of test result clearly requires the field uniformity parameter of reverberation chamber in IEC 61000-4-21 standards.Reverberation
The influence factor of room field uniformity is more, including layout, reverberation in reverberation chamber cavity size, agitator structure, reverberation chamber cavity
The selection of working region in chamber body uses antenna, reverberation chamber making material characteristic etc..In these factors, when determining
The selection and development of angle, which become, after reverberation chamber cavity size and material, between mixing arm shape, size and blade designs rank
The most important key factor of Duan Gaishan reverberation chamber field uniformities.Existing reverberation chamber field uniformity improvement plan is single using only considering
Factor, ignores the multiple factors for influencing field uniformity and the correlation between them, improvement are poor.
Invention content
The present invention provide it is a kind of improve reverberation chamber uniformity method and apparatus, solve existing method improve factor it is single,
The problem of improvement difference.
A method of improving reverberation chamber uniformity, includes the following steps：By two-way analysis of variance method, to influencing institute
Two factors of reverberation chamber field uniform properties are stated, stirring blade length-width ratio, stirring blade angle carry out modeling analysis, and determining influences
It is the second factor that big factor, which is the first factor, influences small factor；First factor is optimized, the first factor is obtained
Optimal value；On the basis of the first factors optimization value, second factor is optimized, obtains the second factors optimization value；
Determine the optimal design value for being combined as the reverberation chamber of the first, second factors optimization value.
Further, the method further includes：Frequency range is monitored according to the uniformity of the reverberation chamber, and multiple monitoring frequencies are set
Point；The optimal design value is calculated to each monitoring frequency point respectively；To it is each it is described monitoring frequency point optimal design value into
Row statistical average obtains the optimal design value of the reverberation chamber of monitoring frequency range.
Preferably, described by two-way analysis of variance method, to influencing two factors of reverberation chamber field uniform properties,
Stirring blade length-width ratio, stirring blade angle carry out modeling analysis, determine influence big factor be the first factor, influence it is small because
The step of element is the second factor, further includes：Respectively to the stirring blade length-width ratio, two factors of stirring blade angle into
Line position grade is decomposed, and the position of stirring blade length-width ratio grade and the position grade of the stirring blade angle are combined, and is established
Test orthogonal arrage；The field uniformity observation combined to each of described experiment orthogonal arrage records, and obtains test data；Root
According to the test data, be calculated the stirring blade length-width ratio and the stirring blade angle side and；According to described
Side and data determine that the first factor, the second factor are：When the stirring blade length-width ratio side and it is more than or equal to the stirring
The side of leaf angle and when, determine that the stirring blade length-width ratio is the first factor, the stirring blade angle be second because
Element, when the stirring blade length-width ratio side and less than the stirring blade angle side and when, determine the stirring blade
Angle is the first factor, and the stirring blade length-width ratio is the second factor.
Preferably, described according to test data, the stirring blade length-width ratio and the stirring blade angle is calculated
Side and the step of, further include：Establishing model according to the test data is：
Xij=μ+αi+βj+εij, i=1 ..., k；J=1 ..., m
α1+...+αk=0
β1+...+βm=0
Wherein, XijIt is j-th of i-th grade and the stirring blade length-width ratio of the stirring blade angle factor
The experimental observation of grade combination, μ XijMean value, αiFor the effect of i-th grade of the stirring blade angle factor, βjIt is
The effect of j-th grade of the stirring blade length-width ratio, εijIt is test error, independently of each other and obeys distribution N (0, σ2)；Meter
It calculates and obtains side and the degree of freedom of the stirring blade length-width ratio and the stirring blade angle.
Preferably, the stirring blade length-width ratio includes 3 positions grade, be respectively first 90 ° of grade, 120 ° of second grade,
150 ° of third position grade, the stirring blade angle includes 4 positions grades, is first grade 1 respectively:1, second grade 1.2:1,
Three grades 1.5:1, the 4th grade 2:1.
Preferably, the monitoring frequency point is 1GHz, 1.1GHz, 1.2GHz, 1.3GHz, 1.4GHz, 1.5GHz.
Further, the reverberation chamber cavity size is the blender leaf of 1.05m × 0.64m × 0.46m, the reverberation chamber
Piece long side regular length is 16cm.
A kind of device improving reverberation chamber uniformity uses any one of claim 1~7 the method, which is characterized in that
Described device includes blender, transmitting antenna；The blender is horizontal positioned, and the leaf angle of the blender is 120 degree, institute
The blade side ratio for stating blender is 1:1.5；The transmitting antenna is placed on the reverberation chamber inside cavity, the reverberation chamber
Cavity size is 1.05m × 0.64m × 0.46m.
Advantageous effect of the present invention includes：The present invention proposes a kind of method for improving reverberation chamber field uniformity, proposes
The theory for the field uniformity pair that two-way analysis of variance method is used to improve reverberation chamber has been obtained two by variance analysis
A factor is in the weight for influencing field uniformity, and the two also has reciprocation, this method to can be generalized to the reverberation of other sizes
In the design of room, the optimization design for reverberation chamber blender provides foundation, to realize the purpose for improving reverberation chamber field uniformity.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and constitutes the part of the present invention, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is a kind of method flow embodiment improving reverberation chamber uniformity；
Fig. 2 is a kind of method flow embodiment of the improvement reverberation chamber uniformity measured comprising multiple frequency points；
Fig. 3 is a kind of method flow embodiment of the improvement reverberation chamber uniformity comprising two-way analysis of variance method；
Fig. 4 is a kind of reverberation chamber ameliorative way test result embodiment；
Fig. 5 is a kind of device embodiment improving reverberation chamber uniformity.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under the premise of creative work, shall fall within the protection scope of the present invention.
Reverberation chamber is one of the place for carrying out EMC test, and reverberation chamber can be considered a high quality factor Q value resonance
Chamber.When indoor transmitting antenna generates radiofrequency signal, electromagnetic energy by reverberation chamber wall and metal machinery blender roundtrip,
It is slowly rotated as blender does not stop, the indoor field distribution of reverberation constantly changes, the field of interior space every bit
Strong size and Orientation also constantly changes, and the rotation of blender can effectively change the electromagnetism side generated by indoor transmitting antenna
Boundary, it is final to stablize and form the mode electric field distribution for meeting electromagnetic boundary conditions to change indoor field distribution.Statistically
It says, in a certain range of workspace in reverberation chamber center, electric field is uniform isotropic.Because reverberation chamber is different from open
The conventional electromagnetic compatibility test place such as field and microwave dark room, its unspecial measure is for ensureing that wave passes under ideal conditions
The generation for phenomena such as broadcasting, can not also avoiding reflection, the refraction of wave, therefore field distribution at a time is impossible uniform.
But the uniform field required by reverberation chamber is in statistical significance.Although the field distribution at i.e. a certain moment is uneven, each observation
The electric field of point can change with the progress of disturbance, and the maximum value of each point electric field is observed in the period if disturbed at one
Distribution, then being uniformly distributed for field is entirely possible realization.
The technical solution provided below in conjunction with attached drawing, each embodiment that the present invention will be described in detail.
Fig. 1 is a kind of method flow embodiment improving reverberation chamber uniformity, and the embodiment of the present invention provides a kind of reverberation chamber
Field uniform properties ameliorative way, includes the following steps：
Step 101, it is stirred by two-way analysis of variance method influencing two factors of reverberation chamber field uniform properties
Blade length-width ratio, stirring blade angle progress modeling analysis are mixed, determining, which influences big factor, is the first factor, influences small factor
For the second factor.
In a step 101, it should be noted that the embodiment of the present invention thinks to influence reverberation chamber field uniform properties important
Two factors are the stirring blade length-width ratio, stirring blade angle, can also carry out modeling analysis to other factors.
Step 102, first factor is optimized, obtains the first factors optimization value.
In a step 102, the method for first factors optimization is obtained according to test data, according to different
The corresponding field characteristic data value of one factor data value is selected.
Step 103, on the basis of the first factors optimization value, second factor is optimized, obtain second because
Plain optimal value.
In step 103, after the first factors optimization value is fixed, second factor is optimized, is obtained described
Second factors optimization value.
Step 104, the optimal design value for being combined as the reverberation chamber of the first, second factors optimization value is determined.
Further, the reverberation chamber cavity size is the blender leaf of 1.05m × 0.64m × 0.46m, the reverberation chamber
Piece long side regular length is 16cm.It should be noted that the mixing arm of the cavity size of the reverberation chamber, the reverberation chamber
Size dimension can be the numerical value in the embodiment of the present invention, can also be other numerical value, be not specially limited here.
Further, when the cavity size of the reverberation chamber is 1.05m × 0.64m × 0.46m, the blade of the blender
120 degree of angle, the blender blade side ratio 1:1.5, the field uniformity of the reverberation chamber is best.It needs to illustrate
It is that mixing arm angle optimal value, the side ratio optimal value of the reverberation chamber are reverberation chambers in embodiments of the present invention
It is obtained under body size.
After reverberation chamber cavity size and material determine, in order to improve the field uniformity of reverberation chamber, the present invention proposes one
The method of angle between kind optimization mixing arm shape, size and blade.This method is first with the reverberation chamber of a specific dimensions
Based on, devise multigroup mixing arm difference angle and emulation that different leaves length-width ratio influences reverberation chamber field uniformity
Experiment, analyze respectively to reverberation chamber field uniformity have an impact as a result, simultaneously further by field uniformity result carry out
Two-way analysis of variance has obtained weight relationship of two geometric senses of blender in influencing reverberation chamber field uniformity, the party
Method can be generalized in the reverberation chamber design of other sizes, and the optimization design for reverberation chamber blender provides foundation.
Fig. 2 is a kind of method flow embodiment of the improvement reverberation chamber uniformity measured comprising multiple frequency points, and the present invention is real
Apply example offer improvement reverberation chamber uniformity method, include the measurement to multiple frequency points in reverberation chamber frequency range, specifically include with
Lower step：
Step 101, it is stirred by two-way analysis of variance method influencing two factors of reverberation chamber field uniform properties
Blade length-width ratio, stirring blade angle progress modeling analysis are mixed, determining, which influences big factor, is the first factor, influences small factor
For the second factor.
Step 102, first factor is optimized, obtains the first factors optimization value.
Step 103, on the basis of the first factors optimization value, second factor is optimized, obtain second because
Plain optimal value.
Step 104, the optimal design value for being combined as the reverberation chamber of the first, second factors optimization value is determined.
Step 105, frequency range is monitored according to the uniformity of the reverberation chamber and multiple monitoring frequency points is set.
Preferably, the monitoring frequency point is 1GHz, 1.1GHz, 1.2GHz, 1.3GHz, 1.4GHz, 1.5GHz.
It should be noted that the monitoring frequency range of reverberation chamber described in the embodiment of the present invention is 1GHz-1.5GHz, the monitoring
Frequency point is set as stepping 0.1GHz, thus the monitoring frequency point is 1GHz, 1.1GHz, 1.2GHz, 1.3GHz, 1.4GHz,
1.5GHz, the reverberation chamber monitoring frequency point can also be other numerical value, be not specially limited here.
Step 106, the optimal design value is calculated to each monitoring frequency point respectively.
In step 106, need to each monitoring blender length-width ratio of frequency point, the blender angle two because
Element carries out modeling analysis, obtains first factor, the second factor, and further obtains the optimal design value of corresponding frequency point.
In step 106, as shown in table 1 below to the optimal design value of each monitoring frequency point calculating.
Table 1 emulates data variance analysis result
| Frequency point (GHz) | A factors side and | B factors side and | Error mean square and |
| 1 | 0.1116 | 0.1813 | 0.7681 |
| 1.1 | 0.0213 | 0.8996 | 0.0241 |
| 1.2 | 0.6223 | 0.9685 | 0.2687 |
| 1.3 | 0.0607 | 0.261 | 0.1073 |
| 1.4 | 0.6294 | 0.0615 | 0.1101 |
| 1.5 | 1.382 | 1.1912 | 0.2214 |
In table 1, the factor A is the blender angle, and factor B is the blender length-width ratio, in the emulation
In data, when frequency point 1GHz, the side of factor A and be 0.1116, the side of factor B and be 0.1813 and is at error mean square
0.7681；When frequency point 1.1GHz, the side of factor A and be 0.0213, the side of factor B and be 0.8996 and is at error mean square
0.0241；When frequency point 1.2GHz, the side of factor A and be 0.6223, the side of factor B and be 0.9685 and is at error mean square
0.2687；When frequency point 1.3GHz, the side of factor A and be 0.0607, the side of factor B and be 0.261 and is at error mean square
0.1073；When frequency point 1.4GHz, the side of factor A and be 0.6294, the side of factor B and be 0.0615 and is at error mean square
0.1101；When frequency point 1.5GHz, the side of factor A and be 1.382, the side of factor B and be 1.1912 and is at error mean square
0.2241。
In six frequency points, in this 4 points of 1GHz-1.3GHz, the B factors of each point side and more than A factors side and.
This 2 points of 1.4GHz and 1.5GHz, A factors side and more than B factors side and.But from the point of view of six points, B factors are not only
In the side of majority point and big, and some points than the side of A factor and go out greatly it is more, and less than A factors side's sum
Those points, difference are little.The comprehensive influence for obtaining leaf angle variation to reverberation chamber field uniformity is more than side ratio and changes to field
The influence of uniformity.
It should be noted that the error sum of squares of some frequency points is bigger, this is because in analysis in order to extract two
A factor brings the influence of interaction between them in error sum of squares into the independent effect of field uniformity, side ratio and folder
Angle is existing on the reciprocation that field uniformity influences.
Step 107, statistical average is carried out to the optimal design value of each monitoring frequency point, obtains the described of monitoring frequency range
The optimal design value of reverberation chamber.
In step 107, it should be noted that the optimal design value of each frequency point is possible to identical or different, such as
Fruit difference needs to carry out statistical average to the optimal design value of each frequency point, obtains the reverberation chamber of monitoring frequency range most
Excellent design value.
The embodiment of the present invention proposes a kind of method for improving reverberation chamber field uniformity, and the method is suitable for entire
Frequency range is monitored, statistical average is carried out on the basis of single frequency point optimizes, the reverberation chamber field for being conducive to entirely monitor frequency range is uniform
Characteristic improves.
Fig. 3 is a kind of method flow embodiment of the improvement reverberation chamber uniformity comprising two-way analysis of variance method, specifically
It comprises the steps of：
Step 201, respectively to two the stirring blade length-width ratio, stirring blade angle factors into line position fraction solution, and
The position grade of the stirring blade length-width ratio and the position grade of the stirring blade angle are combined, experiment orthogonal arrage is established.
In step 201, the stirring blade length-width ratio includes 3 position grades, is first 90 ° of grade, second grade respectively
120 °, 150 ° of third position grade, the stirring blade angle includes 4 positions grades, is first grade 1 respectively:1, second grade
1.2:1, third position grade 1.5:1, the 4th grade 2:1, the experiment orthogonal arrage is as shown in table 2.
Table 2 tests orthogonal arrage
Wherein, factor A is the stirring blade angle, and the stirring blade angle includes 3 position grades, is A1 first respectively
90 ° of the grade in position, 120 ° of A2 seconds grade, 150 ° of A3 thirds position grade, factor B are the stirring blade length-width ratio, the stirring blade
Length-width ratio includes 4 positions grades, is first grade 1 of B1 respectively:1, B2 seconds grade 1.2:1, B3 thirds position grade 1.5:1, B4
Four grades 2:1.The orthogonal arrage first row tested number is experiment serial number, needs to complete 12 sequence numbers in embodiments of the present invention,
There are 2 factors for the problem of being analyzed, i.e., the described stirring blade angle, the stirring blade angle, the row number 1 is institute
Stirring blade angle factor is stated, the row number 2 is the stirring blade side ratio factor, and the row number 1 is according to first grade of A1
90 °, the sequence repeated arrangement 4 times of 120 ° of A2 seconds grade, 150 ° of A3 thirds position grade, the row number 2 is according to first grade 1 of B1:1
Arrange 3 times, B2 seconds grade 1.2:1 arrangement 3 times, B3 thirds position grade 1.5:1 arrangement the 4th 3 times, B4 grade 2:1 arrangement 3 times
Sequentially.Therefore, the embodiment of the present invention needs 12 experiments completing to be respectively：No. 1 experiment A1B1, i.e., the described mixing arm
90 ° of angle, the mixing arm side ratio 1:1；No. 2 experiment A2B1, i.e., described 120 ° of the mixing arm angle are described to stir
Mix device blade side ratio 1:1；No. 3 experiment A3B1, i.e., described 150 ° of the mixing arm angle, the mixing arm side ratio
1:1；No. 4 experiment A1B2, i.e., described 90 ° of the mixing arm angle, the mixing arm side ratio 1.2:1；No. 5 experiment
A2B2, i.e., described 120 ° of the mixing arm angle, the mixing arm side ratio 1.2:1；No. 6 is tested A3B2, i.e., described
150 ° of mixing arm angle, the mixing arm side ratio 1.2:1；No. 7 experiment A1B3, i.e., the described mixing arm folder
90 ° of angle, the mixing arm side ratio 1.5:1；No. 8 experiment A2B3, i.e., described 120 ° of the mixing arm angle are described to stir
Mix device blade side ratio 1.5:1；No. 9 experiment A3B3, i.e., described 150 ° of the mixing arm angle, the mixing arm length of side
Than 1.5:1；No. 10 experiment A1B4, i.e., described 90 ° of the mixing arm angle, the mixing arm side ratio 2:1；O.11
Test A2B4, i.e., described 120 ° of the mixing arm angle, the mixing arm side ratio 2:1；No. 12 experiment A3B4, i.e. institute
State 150 ° of mixing arm angle, the mixing arm side ratio 2:1.
It should be noted that two the stirring blade length-width ratio, stirring blade angle factors into line position fraction solution
Method can be the position grade decomposition method in the embodiment of the present invention, can also be other grade decomposition methods, do not do here especially
It limits.
Step 202, the field uniformity observation combined to each of described experiment orthogonal arrage records, and obtains experiment number
According to.
Step 203, according to the test data, the stirring blade length-width ratio and the stirring blade angle is calculated
Side and.
Preferably, described according to test data, the stirring blade length-width ratio and the stirring blade angle is calculated
Side and the step of, further include：Establishing model according to the test data is：
Xij=μ+αi+βj+εij, i=1 ..., k；J=1 ..., m (1)
α1+...+αk=0 (2)
β1+...+βm=0 (3)
Wherein, XijIt is j-th of i-th grade and the stirring blade length-width ratio of the stirring blade angle factor
The experimental observation of grade combination, μ XijMean value, αiFor the effect of i-th grade of the stirring blade angle factor, βjIt is
The effect of j-th grade of the stirring blade length-width ratio, εijIt is test error, independently of each other and obeys distribution N (0, σ2)；Meter
Calculation obtains the stirring blade length-width ratio and side and the degree of freedom of the stirring blade angle are：
fT=k*m-1 (5)
fA=k-1 (7)
fB=m-1 (9)
fE=(m-1) * (k-1) (11)
Wherein, STFor the total sum of squares, k is the position grade number of the stirring blade angle, and i presss from both sides for the stirring blade
The position grade serial number at angle, m are the position grade number of the stirring blade length-width ratio, and j is the position grade serial number of the stirring blade length-width ratio,
XijThe experiment combined with j-th grade of the stirring blade length-width ratio for i-th grade of the stirring blade angle factor
Observation,It is the mean value of the observation, A is the stirring blade angle, and B is the stirring blade length-width ratio, SAIt is described
The effect quadratic sum of stirring blade angle, fTFor total degree of freedom,It is the mean value of i-th grade of stirring blade angle,
fAFor the degree of freedom of the stirring blade angle, SBFor the effect quadratic sum of the stirring blade length-width ratio, fBFor the paddle
The degree of freedom of piece length-width ratio,It is the mean value of j-th grade of stirring blade length-width ratio, SEFor the error mean square and MSA
Side for the stirring blade angle and MSBFor stirring blade length-width ratio side and.
Step 204, according to the side and data, determine that the first factor, the second factor are：When the stirring blade length and width
Than side and more than or equal to the stirring blade angle side and when, determine the stirring blade length-width ratio be the first factor,
The stirring blade angle is the second factor, when the stirring blade length-width ratio is square and equal less than the stirring blade angle
Side and when, determine that the stirring blade angle is the first factor, the stirring blade length-width ratio be the second factor.
In step 204, according to the value of the side sum, judge significance degree of each factor in result influence, that is, weigh
Series of fortified passes system：If MSA≥MSB, then factor A effects are notable, if MSA< MSB, then factor B effects are notable, wherein MSAIt is described
Side and the MS of stirring blade angleBFor stirring blade length-width ratio side and, factor A be the stirring blade angle, factor
B is the stirring blade length-width ratio.
The embodiment of the present invention proposes the reason for the field uniformity pair that two-way analysis of variance method is used to improve reverberation chamber
It reads, by variance analysis, has obtained two factors in the weight for influencing field uniformity, and the two also has reciprocation, this method
It can be generalized in the reverberation chamber design of other sizes, the optimization design for reverberation chamber blender provides foundation, changes to realize
The purpose of kind reverberation chamber field uniformity.
Fig. 4 is a kind of reverberation chamber ameliorative way test result embodiment, the experimental condition of the embodiment of the present invention：Monitor frequency point
Respectively 1GHz, 1.1GHz, 1.2GHz, 1.3GHz, 1.4GHz, 1.5GHz need 12 examinations of record in embodiments of the present invention
The test result tested is：The mixing arm side ratio 1:1, the mixing arm angle is respectively 90 °, 120 °, 150 °；
The mixing arm side ratio 1.2:1, the mixing arm angle is respectively 90 °, 120 °, 150 °；The blender leaf
Piece side ratio 1.5:1, the mixing arm angle is respectively 90 °, 120 °, 150 °；The mixing arm side ratio 2:1,
The mixing arm angle is respectively 90 °, 120 °, 150 °.
Fig. 5 is a kind of device embodiment improving reverberation chamber uniformity, and the embodiment of the present invention provides a kind of improvement reverberation chamber
The device of uniformity uses the method for improving reverberation chamber uniformity.Described device includes：Blender 1, transmitting antenna 2.
The blender is horizontal positioned, and the leaf angle of the blender is 120 degree, the blade side ratio of the blender
It is 1:1.5；The transmitting antenna is placed on the reverberation chamber inside cavity, the cavity size of the reverberation chamber be 1.05m ×
0.64m×0.46m。
The influence of reverberation chamber field uniformity is compared in order to investigate mixing arm angle and the blade length of side merely, the present invention is real
The tool of use one of example is applied there are five " Z " font blender of blade, the horizontal positioned reverberation chamber of blender as analysis model,
In addition a transmitting antenna is placed in the reverberation chamber inside cavity.Cavity size is 1.05m × 0.64m × 0.46m, blender
Blade long side regular length is 16cm.Field strength monitoring point is located at eight vertex of working region rectangle, area size be 0.55m ×
0.26m×0.2m.It is 1GHz-1.5GHz, stepping 0.1GHz, total of six frequency point that reverberation chamber field uniformity, which monitors frequency range,.
It should be noted that the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that process, method, commodity or equipment including a series of elements include not only those elements, but also includes
Other elements that are not explicitly listed, or further include for this process, method, commodity or the intrinsic element of equipment.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, there is also other identical elements in commodity or equipment.
Example the above is only the implementation of the present invention is not intended to restrict the invention.For those skilled in the art
For, the invention may be variously modified and varied.It is all within spirit and principles of the present invention made by any modification, equivalent
Replace, improve etc., it should be included within scope of the presently claimed invention.
Claims (8)
1. a kind of method improving reverberation chamber uniformity, which is characterized in that include the following steps：
By two-way analysis of variance method, to influencing two factors of reverberation chamber field uniform properties, stirring blade length-width ratio,
Stirring blade angle carries out modeling analysis, and determining influences that big factor is the first factor, to influence small factor be the second factor；
First factor is optimized, the first factors optimization value is obtained；
On the basis of the first factors optimization value, second factor is optimized, obtains the second factors optimization value；
Determine the optimal design value for being combined as the reverberation chamber of the first, second factors optimization value.
2. improving the method for reverberation chamber uniformity as described in claim 1, which is characterized in that the method further includes：
Frequency range is monitored according to the uniformity of the reverberation chamber, and multiple monitoring frequency points are set；
The optimal design value is calculated to each monitoring frequency point respectively；
Statistical average is carried out to the optimal design value of each monitoring frequency point, obtains the optimal of the reverberation chamber of monitoring frequency range
Design value.
3. as claim 1~2 any one of them improves the method for reverberation chamber uniformity, which is characterized in that described by double
Analysis of variance method, to influencing two factors of reverberation chamber field uniform properties, stirring blade length-width ratio, stirring blade folder
Angle carries out modeling analysis, and determining, which influences big factor, is the first factor, influences the step of small factor is the second factor, further
Including：
Respectively to two the stirring blade length-width ratio, stirring blade angle factors into line position fraction solution, and by the paddle
The position grade of piece length-width ratio is combined with the position grade of the stirring blade angle, establishes experiment orthogonal arrage；
The field uniformity observation combined to each of described experiment orthogonal arrage records, and obtains test data；
According to the test data, be calculated the stirring blade length-width ratio and the stirring blade angle side and；
According to the side and data, determine that the first factor, the second factor are：When the stirring blade length-width ratio side and it is more than
Equal to the stirring blade angle side and when, determine the stirring blade length-width ratio be the first factor, the stirring blade
Angle is the second factor, when the stirring blade length-width ratio side and less than the stirring blade angle side and when, determine
The stirring blade angle is the first factor, and the stirring blade length-width ratio is the second factor.
4. improving the method for reverberation chamber uniformity as claimed in claim 3, which is characterized in that described according to test data, meter
Calculate obtain the stirring blade length-width ratio and the stirring blade angle side and the step of, further include：
Establishing model according to the test data is：
Xij=μ+αi+βj+εij, i=1 ..., k；J=1 ..., m
α1+...+αk=0
β1+...+βm=0
Wherein, XijFor j-th grade group of i-th grade and the stirring blade length-width ratio of the stirring blade angle factor
The experimental observation of conjunction, μ XijMean value, αiFor the effect of i-th grade of the stirring blade angle factor, βjIt is described
The effect of j-th grade of stirring blade length-width ratio, εijIt is test error, independently of each other and obeys distribution N (0, σ2)；
The stirring blade length-width ratio is calculated and the square of the stirring blade angle is with degree of freedom：
fT=k*m-1
fA=k-1
fB=m-1
fE=(m-1) * (k-1)
Wherein, STFor the total sum of squares, k is the position grade number of the stirring blade angle, and i is the stirring blade angle
Position grade serial number, m are the position grade number of the stirring blade length-width ratio, and j is the position grade serial number of the stirring blade length-width ratio, XijFor
The test observation that i-th grade of the stirring blade angle factor is combined with j-th grade of the stirring blade length-width ratio
Value,It is the mean value of the observation, A is the stirring blade angle, and B is the stirring blade length-width ratio, SAFor the stirring
The effect quadratic sum of leaf angle, fTFor total degree of freedom,It is the mean value of i-th grade of stirring blade angle, fAFor
The degree of freedom of the stirring blade angle, SBFor the effect quadratic sum of the stirring blade length-width ratio, fBFor the paddle length of a film
The degree of freedom of wide ratio,It is the mean value of j-th grade of stirring blade length-width ratio, SEFor the error mean square and MSAFor institute
State side and the MS of stirring blade angleBFor stirring blade length-width ratio side and.
5. as claim 1~2 any one of them improves the method for reverberation chamber uniformity, which is characterized in that the paddle
Piece length-width ratio includes 3 position grades, is first 90 ° of grade, 120 ° of second grade, 150 ° of third position grade, the stirring blade respectively
Angle includes 4 positions grades, is first grade 1 respectively:1, second grade 1.2:1, third position grade 1.5:1, the 4th grade 2:1.
6. as claimed in claim 2 improve reverberation chamber uniformity method, which is characterized in that the monitoring frequency point be 1GHz,
1.1GHz、1.2GHz、1.3GHz、1.4GHz、1.5GHz。
7. as claim 1~6 any one of them improves the method for reverberation chamber uniformity, which is characterized in that the reverberation chamber
Cavity size is 1.05m × 0.64m × 0.46m, the mixing arm long side regular length of the reverberation chamber is 16cm.
8. a kind of device improving reverberation chamber uniformity uses any one of claim 1~7 the method, which is characterized in that institute
It includes blender, transmitting antenna to state device；
The blender is horizontal positioned, and the leaf angle of the blender is 120 degree, and the blade side ratio of the blender is 1:
1.5；
The transmitting antenna is placed on the reverberation chamber inside cavity, the cavity size of the reverberation chamber be 1.05m × 0.64m ×
0.46m。
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