CN107543970A - A kind of dielectric constant measurement method based on data base calibration method - Google Patents
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Abstract
The invention belongs to dielectric constant measurement technical field, there is provided a kind of dielectric constant measurement method based on data base calibration method, the measurement for coaxial configuration dielectric material；The present invention uses three-stage coaxial holder, including left section of fixture, stage casing fixture and right section of fixture, is used to fill testing medium, its connected mode is：Left section of fixture is connected with right section of fixture or left section of fixture, stage casing fixture, right section of fixture are sequentially connected；First, database is established using multiple sample medium materials；Then left section of fixture after filling testing medium material is connected with right section of fixture, measures S parameter, and determine fixture parameter；Finally three sections of fixtures after filling testing medium material are sequentially connected, measure S parameter, and are handled by fixture De- embedding, it is calibrated end face and is located inside sample to be tested, the testing medium material dielectric constant accurately measured.The present invention has the advantages that inexpensive, easy to operate, matching requirements are relatively low, has degree of precision.
Description
Technical field
The invention belongs to dielectric constant measurement technical field, and in particular to it is a kind of for coaxial configuration dielectric material based on
The dielectric constant measurement method of data base calibration method.
Background technology
With the development of science and technology microwave technology is more and more applied in production, life and national defense and military, and
In microwave technology, electromagnetic wave propagation and transmitting are the theoretical bases, and therefore, the research to microwave transmission line is always
The focus of research, and the combination of material science in, microwave transmission line obtained quick development, and transmission line is utilized
The assurance of the electromagnetic property of material medium, it is the key point in transmission line production process.It is in microwave regime, coaxial line at present
A kind of wide variety of transmission line, therefore, the dielectric constant of quick, accurate, low cost measurement coaxial configuration material, studying
With it is significant in production process.
At present, the measuring method of common vehicle dielectric constant have transmission bounce technique, Resonant-cavity Method, free-space Method.Its
In, free-space Method can realize the non-cpntact measurement to medium, such as Application No. CN201410049841.1, entitled
One kind, which is disclosed, in the patent document of " a kind of test system and method for accurate Measuring Dielectric Constant " utilizes antenna feed impedance
Change and radiation field accurately measure sample electromagnetic parameter method；But this method for dielectric material processing requirement compared with
Height, and this method it is relative complex, it is necessary to design a whole set of T such as LNA, frequency mixer, power amplifier R components and special
Antenna etc., cost is higher, and restricted application.Resonant-cavity Method, although having preferable measurement accuracy for low-loss material,
But it is narrow to equally exist measurement frequency range, the shortcomings of measuring instrument complexity.Transmission bounce technique earliest by Nicolson, Ross and Weir
Et al. proposed in 1970, therefore also referred to as NRW methods, its method essence be using individual reflection coefficient and single transmission coefficient with
The relation of dielectric constant obtains complex dielectric permittivity；Sample to be tested is placed in air transfer line by this method, by measuring both-end
The S parameter of mouth, in conjunction with De- embedding processing, inverting obtains the complex dielectric permittivity of sample to be tested, for this method, obtained at present
Certain application, such as Application No. CN201510305197.4, entitled " the broadband alternating temperature dielectric of solid and dusty material
A kind of temperature variation testing method of the dielectric constant based on transmission bounce techniques is disclosed in the patent document of constant test system "；But
It is to be directed to such a method, however it remains certain shortcoming：First, during measurement, because sample is placed in air transfer line, for
The matching requirements of system are higher, to be accurately positioned for sample to be tested, otherwise will cause measurement error；Secondly, for surveying
End face is measured, it is necessary to carry out De- embedding processing, if using TRL De- embedding methods, higher calibration accuracy can be obtained, but fixture is often
It is nonstandard device, calibrating device need to be customized, it is with high costs, if being handled merely with phse conversion, certain loss can be brought
Error.
The content of the invention
The shortcomings that it is an object of the invention to for above dielectric constant measurement method, there is provided one kind is based on data base calibration
The dielectric constant measurement method of method, this method obtain S parameter, and pass through by coaxial holder using vector network analyzer
Establish database and carry out fixture De- embedding, and be calibrated to sample to be tested internal end surface to directly obtain multiple Jie of single propagation constant
Electric constant.Measurement object of the present invention is the dielectric material for coaxial configuration, relative to traditional dielectric constant measuring method, this hair
It is bright to have the advantages that inexpensive, easy to operate, matching requirements are relatively low, there is degree of precision.
To achieve the above object, the solution that uses of the present invention for：
A kind of dielectric constant measurement method based on data base calibration method, it is characterised in that using the same axle clamp of three-stage
Tool, including left section of fixture, stage casing fixture and right section of fixture, it is used to fill testing medium, its connected mode is：Left section of fixture with
Right section of fixture connection or left section of fixture, stage casing fixture, right section of fixture are sequentially connected；Specifically include following steps：
Step 1. establishes database：N number of sample media material is filled to left section of fixture and right section of fixture respectively, passes through electricity
Magnetic simulation software measures the S parameter of left section of fixture and right section of fixture respectively：
Left section of fixture Sl：Right section of fixture Sr：
And left section of fixture and right section of fixture S parameter are transformed to T parameters respectively：
Left section of fixture Tl：Right section of fixture Tr：
Calculate to obtain left section of fixture and the T parameters T of right section of fixture cascadea：
In the T parameters T for cascading left section of fixture with right section of fixtureaBe converted to S parameter Sa：
By parameter Tl、Tr、Ta、SaDatabase is stored in, that is, establishes parameter database, for carrying out fixture De- embedding；
Step 2. fills testing medium material to left section, stage casing and right section of fixture respectively, by left section of fixture and right section of folder
Tool connects and accesses vector network analyzer, measures to obtain S parameter Ss：
Calculate parameter S in databaseaWith SsError amount：
Find out the S of minimum error valuesaParameter, it is labeled asIts corresponding Tl、TrParameter is regarded as filling testing medium rear left
Section fixture, right section of fixture T parameters, be respectively labeled as
Step 3. fixture De- embedding：Left section of fixture, stage casing fixture, right section of fixture are sequentially connected, and access vector network
Analyzer, measure to obtain S parameter Sz, and be converted to T parameters Tz：
The T parameters T of stage casing fixture after testing medium must be filled by calculatingx：
And be converted to S parameter Sx：
Then calculate to obtain testing medium material dielectric constant εr：Wherein, T=Sx21, c is the light velocity,
π f of ω=2, f are frequency, and d is the length of interlude testing medium.
In the present invention, S parameter and the mutual conversion formula of T parameters are as follows：
Wherein, Δ S=S11S22-S12S21, i=1,2,3...N,
Wherein, Δ T=T11T22-T12T21, i=1,2,3...N；
The beneficial effects of the present invention are：
The present invention provides a kind of dielectric constant measurement method based on data base calibration method, and this method is using three-stage
Coaxial holder, testing medium material is filled in the fixture of three sections of left, center, right, due to treating test sample dielectric material in left and right ends fixture
Inside identical, i.e., it is continuous, institute in the hope of S parameter be sample to be tested single transmission coefficient, and then according to single biography
Relation between defeated coefficient and complex dielectric permittivity, obtain complex dielectric permittivity to be measured；Meanwhile testing medium material as fixture one
Part, then calibrate between end face and fixture end face and discontinuity is not present, after the processing of fixture De- embedding, it calibrates end face position
Inside sample to be tested, measurement accuracy is greatly improved；Meanwhile the fixture turns as far as possible to reduce by sample positioning not during matching somebody with somebody
Error caused by accurate；To sum up, the present invention with it is inexpensive, easy to operate, matching requirements are relatively low, excellent with degree of precision etc.
Point.
Brief description of the drawings
Fig. 1 is three-stage coaxial holder in the present invention along the sectional view in axis vertical direction；Wherein, 1 is metal threaded,
2 be outer conductor, and 3 be SMA adapters Supporting Media (being usually polytetrafluoroethylene (PTFE)), and 4 be SMA inner wires, and 5 be air, and 6,7 be pin
Nail, A-F represent end face A to end face F.
Fig. 2 is the assembling schematic diagram of testing medium material in the present invention.
Fig. 3 is the schematic three dimensional views of three-stage coaxial holder in the present invention.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples, it is impossible to is interpreted as limitation of the present invention.
The present embodiment provides a kind of dielectric constant measurement method based on data base calibration method, and the three-stage that it is used is same
The structure of axle clamp tool between fixture using pin or screw as shown in figure 1, connected, especially, left section of fixture both can be direct
Connect with right section of fixture, shown in such as Fig. 3 (b), can also three sections of left, center, right be sequentially connected, shown in such as Fig. 3 (a)；Two sections of left and right folder
Have for nonstandard coaxial dielectric to be changed into SMA connector sizes, S parameter is measured with connected vector Network Analyzer, fixture
Left and right port is designed using SMA adapters, directly can be connected by SMA and coaxial line and then with arrow net.Wherein institute as shown in Figure 1, Figure 2
Show, left side fixture is end face A, a length of L1 of C portion, and intermediate sample fixture is a length of L2 between end face C, D, right side fixture be end face D,
A length of L3 between F, it should be pointed out that, L1=L3.
In the present embodiment, database is established using multiple sample media materials first, for example, being foamed for polytetrafluoroethylene (PTFE)
Material, dielectric constant 1.0~2.1 can be established, the database of imaginary part 0.002~0.02, the selection of its step value is more accurate, then measures
As a result it is more accurate；Cut the coaxial cable to be measured that a segment length is 2*L1+L2+2*L3, first by cable be cut into it is long be respectively L1,
L3, L1+L2+L3 three parts, a length of L1, L3 are respectively charged into left section and right section of fixture, especially, Ll=L3；By left and right two
Side fixture docking, accesses vector network analyzer, S parameter Ss；And contrasted with the S parameter in database, selection actual measurement with
The minimum S parameter of model error, the S parameter as fixture；It is sequentially connected by three sections of fixtures, and a length of L1+L2+L3 is treated
Survey medium to load, connected vector Network Analyzer measurement medium S parameter；The De- embedding algorithm that matlab writes is substituted into, passes through institute
The method for stating two-port network matrix cascade, medium S parameter will be measured and be transformed into C, D end face from A, F end face, as shown in Figure 1；Most
Bring the S parameter of resulting C, D end face into designed matlab programs afterwards, be calculated the multiple dielectric of testing medium
Constant, by Microwave Net and transmission line theory, the S of C, D end face21Single transmission coefficient T as in sample, for non magnetic
Material, there is formula：By the Shi Ke get：Wherein T=S21, ω=2 π f, c are the light velocity,
F is frequency, d length, i.e. testing medium length L2 between end face C, D.
The foregoing is only a specific embodiment of the invention, any feature disclosed in this specification, except non-specifically
Narration, can alternative features equivalent by other or with similar purpose replaced；Disclosed all features or all sides
Method or during the step of, in addition to mutually exclusive feature and/or step, can be combined in any way.
Claims (1)
- A kind of 1. dielectric constant measurement method based on data base calibration method, it is characterised in that using three-stage coaxial holder, Including left section of fixture, stage casing fixture and right section of fixture, it is used to fill testing medium, its connected mode is：Left section of fixture and the right side The connection of section fixture or left section of fixture, stage casing fixture, right section of fixture are sequentially connected；Specifically include following steps：Step 1. establishes database：N number of sample media material is filled to left section of fixture and right section of fixture respectively, imitated by electromagnetism True software measures the S parameter of left section of fixture and right section of fixture respectively：Left section of fixture Sl：Right section of fixture Sr：And left section of fixture and right section of fixture S parameter are transformed to T parameters respectively：Left section of fixture Tl：Right section of fixture Tr：Calculate to obtain left section of fixture and the T parameters T of right section of fixture cascadea：<mrow> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>a</mi> <mn>11</mn> </mrow> </msub> </mtd> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>a</mi> <mn>12</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>a</mi> <mn>21</mn> </mrow> </msub> </mtd> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>a</mi> <mn>22</mn> </mrow> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>=</mo> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>l</mi> <mn>11</mn> </mrow> </msub> </mtd> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>l</mi> <mn>12</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>l</mi> <mn>21</mn> </mrow> </msub> </mtd> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>l</mi> <mn>22</mn> </mrow> </msub> </mtd> </mtr> </mtable> </mfenced> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>r</mi> <mn>11</mn> </mrow> </msub> </mtd> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>r</mi> <mn>12</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>r</mi> <mn>21</mn> </mrow> </msub> </mtd> <mtd> <msub> <mover> <mi>T</mi> <mi>i</mi> </mover> <mrow> <mi>r</mi> <mn>22</mn> </mrow> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> <mi>i</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mn>2</mn> <mo>,</mo> <mn>3...</mn> <mi>N</mi> <mo>,</mo> </mrow>In the T parameters T for cascading left section of fixture with right section of fixtureaBe converted to S parameter Sa：By parameter Tl、Tr、Ta、SaDatabase is stored in, that is, establishes parameter database, for carrying out fixture De- embedding；Step 2. fills testing medium material to left section, stage casing and right section of fixture respectively, and left section of fixture and right section of fixture are connected Connect and access vector network analyzer, measure to obtain S parameter Ss：Calculate parameter S in databaseaWith SsError amount：Find out the S of minimum error valuesaParameter, it is labeled asIts corresponding Tl、TrParameter is regarded as filling testing medium rear left section folder Tool, right section of fixture T parameters, be respectively labeled asStep 3. fixture De- embedding：Left section of fixture, stage casing fixture, right section of fixture are sequentially connected, and access vector network analysis Instrument, measure to obtain S parameter Sz, and be converted to T parameters Tz：The T parameters T of stage casing fixture after testing medium must be filled by calculatingx：<mrow> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msub> <mi>T</mi> <mrow> <mi>x</mi> <mn>11</mn> </mrow> </msub> </mtd> <mtd> <msub> <mi>T</mi> <mrow> <mi>x</mi> <mn>12</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>T</mi> <mrow> <mi>x</mi> <mn>21</mn> </mrow> </msub> </mtd> <mtd> <msub> <mi>T</mi> <mrow> <mi>x</mi> <mn>22</mn> </mrow> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>=</mo> <msup> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msub> <mover> <mi>T</mi> <mo>^</mo> </mover> <mrow> <mi>l</mi> <mn>11</mn> </mrow> </msub> </mtd> <mtd> <msub> <mover> <mi>T</mi> <mo>^</mo> </mover> <mrow> <mi>l</mi> <mn>12</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>T</mi> <mo>^</mo> </mover> <mrow> <mi>l</mi> <mn>21</mn> </mrow> </msub> </mtd> <mtd> <msub> <mover> <mi>T</mi> <mo>^</mo> </mover> <mrow> <mi>l</mi> <mn>22</mn> </mrow> </msub> </mtd> </mtr> </mtable> </mfenced> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msub> <mi>T</mi> <mrow> <mi>z</mi> <mn>11</mn> </mrow> </msub> </mtd> <mtd> <msub> <mi>T</mi> <mrow> <mi>z</mi> <mn>12</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>T</mi> <mrow> <mi>z</mi> <mn>21</mn> </mrow> </msub> </mtd> <mtd> <msub> <mi>T</mi> <mrow> <mi>z</mi> <mn>22</mn> </mrow> </msub> </mtd> </mtr> </mtable> </mfenced> <msup> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msub> <mover> <mi>T</mi> <mo>^</mo> </mover> <mrow> <mi>r</mi> <mn>11</mn> </mrow> </msub> </mtd> <mtd> <msub> <mover> <mi>T</mi> <mo>^</mo> </mover> <mrow> <mi>r</mi> <mn>12</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>T</mi> <mo>^</mo> </mover> <mrow> <mi>r</mi> <mn>21</mn> </mrow> </msub> </mtd> <mtd> <msub> <mover> <mi>T</mi> <mo>^</mo> </mover> <mrow> <mi>r</mi> <mn>22</mn> </mrow> </msub> </mtd> </mtr> </mtable> </mfenced> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> <mo>,</mo> </mrow>And be converted to S parameter Sx：Then calculate to obtain testing medium material dielectric constant εr：Wherein, T=Sx21, c is the light velocity, the π of ω=2 F, f are frequency, and d is the length of interlude testing medium.
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| CN110048769A (en) * | 2019-04-29 | 2019-07-23 | 中国电子科技集团公司第四十一研究所 | A kind of adaptive frequency response function test device and method |
| CN110361685A (en) * | 2019-07-01 | 2019-10-22 | 北京无线电计量测试研究所 | A kind of wide-band oscilloscope probe transmission characteristic calibration method and system |
| CN110361685B (en) * | 2019-07-01 | 2021-07-30 | 北京无线电计量测试研究所 | Broadband oscilloscope probe transmission characteristic calibration method and system |
| CN110596463A (en) * | 2019-09-20 | 2019-12-20 | 电子科技大学 | Coaxial measuring device, testing system and method for measuring dielectric constant of medium |
| CN110703054A (en) * | 2019-10-29 | 2020-01-17 | 山东省科学院自动化研究所 | Sample dielectric property testing device and method based on terahertz free space method |
| CN117491743A (en) * | 2024-01-02 | 2024-02-02 | 青岛农业大学 | Radio frequency complex permittivity measuring device and method |
| CN117491743B (en) * | 2024-01-02 | 2024-04-02 | 青岛农业大学 | Radio frequency complex permittivity measuring device and method |
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