CN207908584U - Microfluid dielectric property detection device based on coplanar waveguide transmission line - Google Patents
Microfluid dielectric property detection device based on coplanar waveguide transmission line Download PDFInfo
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- CN207908584U CN207908584U CN201721771602.2U CN201721771602U CN207908584U CN 207908584 U CN207908584 U CN 207908584U CN 201721771602 U CN201721771602 U CN 201721771602U CN 207908584 U CN207908584 U CN 207908584U
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Abstract
The microfluid dielectric property detection device based on coplanar waveguide transmission line that the utility model discloses a kind of, include two symmetrical compound detail I and compound detail II of coplanar waveguide transmission line and the loaded in series conduction band among coplanar waveguide transmission line, compound detail I and compound detail II are made of the line of rabbet joint detail of multiple open-ends, compound detail I is equipped with the test zone for placing test sample, and the input port and output port of coplanar waveguide transmission line are connected by sub-miniature A connector with vector network analyzer respectively.The structure of the detecting device of the utility model is simple, high sensitivity, and the compound detail on sensor is processed using traditional etching technics, and cheap, difficulty of processing is low, convenient for batch production, it can be achieved that online real-time broadband detection.
Description
Technical field
The utility model belongs to MMU microwave measurement unit technical field, and in particular to a kind of based on the micro- of coplanar waveguide transmission line
Fluid dielectric property detection device.
Background technology
As applying for microwave technology constantly obtains in the fields such as biology, cytology, food chemistry and electromagnetic compatibility
Alarming development, many emerging cross disciplines are come into being, as microwave chemical, electromagnetic field are biomedical.However, because of people couple
Microwave is insufficient with Biomedia or the research of chemical substance interaction mechanism, results in microwave technology answering in above-mentioned field
With still facing many technical barriers.Biomedia or the electrical parameter of chemical substance are the weights that reflected microwave interacts therewith
Parameter is wanted, such as in field of biology, as protein heat denaturation, the double-deck plasma membrane, unicellular characteristic, and in microwave chemical field
The research of non-thermal effect is all the variation expansion research by analyzing biological or chemical substance dielectric property.
The very small i.e. measurand of research object in these fields is microfluid, causes the micro- of test signal
It is small, therefore sensitivity to detection and accuracy propose very high requirement, otherwise letter faint caused by these micro volumes
It number will be submerged in the ambient noise of test device.In general the electrical characteristics measurement method of microfluid can be divided into resonance
The characteristics of method and disresonance method, the resonance method is that have very high high sensitivity and very accurate accuracy, but belong to narrowband and non-
Contact is tested.The characteristics of disresonance method, is that equipment is simple, measurement sensitivity is low but belongs to broadband, it can be achieved that contact and non-connecing
Property is touched to measure.Document Dong J, Shen F, Dong Y, et al. " Noncontact Measurement of
Complex Permittivity of Electrically Small Samples at Microwave Frequencies
[J]”. IEEE Transactions on Microwave Theory & Techniques, 2016, 64(9):2883-
2893. realize the electrical characteristics test of electric small-size sample using the resonance method, but belong to narrow band detection.Disresonance method is to realize width
Main method with detection, and transmission/bounce technique is most widely used in non-the resonance method.The electrical measurement side of many microfluids
Method is all made of coplanar waveguide transmission line, and conduction band loads microchannel therebetween, but does not account for enhancing microchannel
Electric field, do not account for impedance matching yet, the strongest part of electromagnetism in entire detection device caused to concentrate on coplanar wave guide transmission
In two transmission gaps of line, and microchannel also needs to be processed using special technique, and this considerably increases sensors
Processing cost and difficulty, be difficult to batch production and promote the use of in a wide range of.
In consideration of it, the utility model proposes a kind of, the broadband microfluid electrical characteristics microwave detection based on transmission/shooting method fills
It sets, which is constituted using coplanar waveguide transmission line plus microchannel, and microchannel uses the slot of multiple open-ends
Line detail, this greatly enhances the electric fields of test zone, to make detection sensitivity greatly improve.
Invention content
For the office for overcoming in current most of microfluid dielectric property microwave detecting devices to the sensitivity for being detected sample
It is sex-limited, the microfluid dielectric property detection device based on coplanar waveguide transmission line that the purpose of this utility model is to provide a kind of.
Line of rabbet joint detail by loading multiple open-ends of two symmetrical structures on the intermediate conduction band of coplanar waveguide transmission line improves
Detection sensitivity.
The utility model adopts the following technical scheme that solve above-mentioned technical problem, the miniflow based on coplanar waveguide transmission line
Body dielectric property detection device, it is characterised in that including coplanar waveguide transmission line and loaded in series among coplanar waveguide transmission line
The symmetrical compound detail I and compound detail II of two of conduction band, compound detail I and compound detail II are by multiple open-ends
Line of rabbet joint detail forms, and compound detail I is equipped with the test zone for placing test sample, and compound detail II is compound for enhancing
On detail I the electric field strength of test zone and meet impedance matching so that improve detection sensitivity and accuracy, compound detail I
Spacing is equipped between compound detail II for ensureing signal normal transmission without by crosstalk, the input terminal of coplanar waveguide transmission line
Mouth and output port are connected by sub-miniature A connector with vector network analyzer respectively.
Further preferably, the sample, which is blocks of solid, can be directly placed at test zone, and sample is fluid
Or solid powder can be loaded by arc type microflow channels in test zone, which is pasted onto test by conducting resinl
Region.
Further preferably, the coplanar waveguide transmission line and compound detail I and compound detail II are all made of conventional etch work
Skill etches on the metal layer, which is set on medium substrate, and the material of medium substrate is Rogers R4003C,
Relative dielectric constant is 3.38, and the thickness of medium substrate is 0.8mm, in coplanar waveguide transmission line two bars transmission gap and in
Between the width of conduction band be respectively 0.15mm and 2.3mm, compound detail I and compound detail II by 6 open-ends line of rabbet joint branch
Section composition, the line of rabbet joint detail length and gap width of open-end are respectively 1.7mm and 0.15mm.
The detection method of microfluid electrical characteristics microwave detecting device described in the utility model, it is characterised in that specific steps
For：
（1）First two composite supports for determining and being loaded on conduction band among coplanar waveguide transmission line are measured with practical by emulating
The optimum size of section, then etch media substrate obtain detection device, the input port at coplanar waveguide transmission line both ends and output
Port is connected by sub-miniature A connector with vector network analyzer respectively；
（2）According to microwave transmission characteristic, microwave signal is inputted by input port, through compound detail I and compound detail II, most
After reach output port, the compound detail I and compound detail II of loaded in series make test zone have very strong electric field, and in work
Make to meet impedance matching in frequency band, and then greatly improve the sensitivity of measurement, tested microfluid is positioned over the micro- of test zone
It in flow tube, is equivalent on coplanar waveguide transmission line and introduces discontinuous structure, this discontinuous structure will be configured to co-planar waveguide
Transmission line two-port scattering parameter, and the situation of change of scattering parameter carries the information of test sample dielectric property, finally adopts
With neural network method, the scattering parameter information inverting comprising test sample based on test is tested the dielectric constant of microfluid
Further preferably, step（2）Detailed process be：Use finite element FEM to different electrical characteristics by micrometer first
The amplitude and phase information of scattering parameter caused by fluid are emulated, and a large amount of sample needed for training neural network is obtained；
Secondly the suitable neural network of selection and algorithm, are established between the scattering parameter information of test and the dielectric property of tested microfluid
Relationship, the sample data training neural network being used in combination constantly regulates and controls the parameter of neural network until reaching network and having
The ability intelligently exported, i.e. network can correctly provide output information according to continually changing input information；It finally will be different
Sample caused by measuring device scattering parameter information input to trained network, the dielectric property of measured object will be by
Trained network is correctly exported according to the scattering parameter information of its test.
The utility model has the advantages that compared with prior art：Structure of the detecting device is simple, high sensitivity, passes
Compound detail on sensor is processed using traditional etching technics, and cheap, difficulty of processing is low, can be real convenient for batch production
Present line real-time broadband detection.The utility model proposes detection device because of two of load identical and symmetrical compound details,
The electric field in test zone is not only enhanced, impedance matching is improved, reduces reflectance factor, and the work of sensor can be adjusted
Make frequency band, measured compared with conventional co-planar waveguide transmission line, sensitivity greatly improves, and can be used for detecting small sample.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model detection device；
Fig. 2 is the structural schematic diagram of microflow channels in the utility model detection device；
Fig. 3 is that the utility model detection device loads compound detail I and loads the emission ratio comparison of compound detail I, II
Figure；
Fig. 4 is that the utility model detection device loads compound detail I and loads the transmission coefficient comparison of compound detail I, II
Figure；
Fig. 5 is the field distribution schematic diagram of test zone in the utility model detection device.
In figure：1- medium substrates, 2- metal layers, 3- coplanar waveguide transmission lines, 4- signal transmissions gap, the centres 5- conduction band,
The line of rabbet joint detail of 6- terminal short circuits, 7- metals, 8- input ports, 9- output ports, T- test zones.
Specific implementation mode
The particular content of the utility model is described in detail in conjunction with attached drawing.As shown in Figure 1, detection dress described in the utility model
It sets and is made of doubling plate, bottom is medium substrate 1, and upper layer is metal layer 2, and coplanar wave guide transmission is etched on metal layer 2
Line 3 comprising two bars with transmitting gap 4, intermediate conduction band 5 and metal 7, there are two identical for etching on intermediate conduction band 5
Symmetrical structure compound detail I and compound detail II, the compound detail I and compound detail II by 6 open-ends line of rabbet joint detail 6
It constitutes, the miniflow for placing sample of arc type is pasted with above the line of rabbet joint detail 6 of the open-end of compound detail I
Pipe, the structures of the microflow channels as shown in Fig. 2, i.e. the test zone of the utility model is the upper test zone T of compound detail I,
Detected fluid can be placed on by microflow channels on the test zone T on compound detail I, and the line of rabbet joint detail of open-end should meet
A large amount of electric field is assembled in impedance matching again, to improve accuracy and the sensitivity of detection, the microflow channels structure being used cooperatively
As shown in Fig. 2, the size of the microflow channels can customize as needed.
The working band of the detection device is influenced by the compound detail I and compound detail II that are loaded.As shown in Figure 1
Be signal transmission direction along Y-direction, compound detail I and compound detail II are symmetrical about X-axis, and the distance between be not easy it is too close,
Otherwise easily cause signal cross-talk, the distance between two symmetrical compound details are 4.2mm in the utility model, pass through FEM numerical value
Method calculates the working band that display slightly increases detection device plus compound detail II, and maximum result is reduction of reflection system
Number, enhances the electric field strength of test zone on compound detail I, electric field strength can reach 105V.It compares and co-planar waveguide
Line method is transmitted, the utility model greatly strengthens test zone using the symmetrical compound detail I and compound detail II of load
Electric field strength, largely improve detection sensitivity and accuracy, but sacrifice detection frequency band, both just in this way, this
Utility model still belongs to wide band detection, working range 8-18GHz.
The material of the medium substrate is Rogers R4003C, relative dielectric constant 3.38, the thickness of medium substrate
Width for 0.8mm, the two bars transmission gap of coplanar waveguide transmission line is 0.15mm, and the centre of coplanar waveguide transmission line is led
The width of band is 2.3mm, two loaded thereon symmetrical compound detail I and compound detail II, the compound detail I and composite support
Section II is made of the line of rabbet joint detail of open-end, and the length and gap width of the line of rabbet joint detail of open-end are respectively 1.7mm
And 0.15mm, the number of detail is 6, and the length of the line of rabbet joint detail of open-end can influence the working band of sensor.
Fig. 3 and Fig. 4 be the detection device proposed load compound detail I and while be symmetrical with X-axis load as shown in Figure 1 it is compound
The scattering parameter of detail I, II compare, it can be seen from the figure that after the symmetrical compound detail I and compound detail II of load, improve
Reflectance factor, slightly broadening working band so that working frequency from 10-18GHz broadenings be 9-18GHz.From Fig. 3 and Fig. 4
It can also be seen that the detection device is in its reflectance factor of 9-18GHz S11Less than -15dB, transmission coefficient S21More than -2dB, i.e.,
The working frequency of the detection device is 9-18GHz, belongs to wide band detection, and D shown in Fig. 3 and 4 represents measuring device and only loads
Compound detail I, S represent measuring device while loading compound detail I and compound detail II, the terminal of test zone, that is, sensor
The field distribution of 6 part of detail of the line of rabbet joint detail structure I as shown in Figure 1 of open circuit was as shown in figure 5, it can be seen from the figure that should
The test zone electric field of detection device is strongest in entire detection device and has reached 105V, therefore sample load is existed
Test zone, caused signal can be captured by detection device sensitivity.And the utility model proposes detection device size
For 19.8mm*12.5mm*0.8mm, easily micro-analysis system can be integrated into other circuit arrangements.Particularly, the reality
It is made of coplanar waveguide transmission line with novel proposed detection device, its biggest advantage is that can be according to its impedance operator need
The size of reasonable arrangement sensor is wanted, which is that the impedance of coplanar waveguide transmission line is passed by intermediate conduction band and two bars
The ratio in defeated gap determines, therefore the utility model can process more rational size according to the attribute of institute's sample, feature.
The utility model proposes microfluid dielectric property calculating process it is as follows：
1, two composite supports loaded on conduction band among coplanar waveguide transmission line are determined by emulation and practical measurement first
The optimum size of section, then etch media substrate obtain detection device, the input port at coplanar waveguide transmission line both ends and output
Port is connected by sub-miniature A connector with vector network analyzer respectively；
2, according to microwave transmission characteristic, microwave signal is inputted by input port, through compound detail I and compound detail II, most
After reach output port, the compound detail I and compound detail II of loaded in series make test zone have very strong electric field, and in work
Make to meet impedance matching in frequency band, and then greatly improve the sensitivity of measurement, tested microfluid is positioned over the micro- of test zone
It in flow tube, is equivalent on coplanar waveguide transmission line and introduces discontinuous structure, this discontinuous structure will be configured to co-planar waveguide
Transmission line two-port scattering parameter, and the situation of change of scattering parameter carries the information of test sample dielectric property, finally adopts
With neural network method, the scattering parameter information inverting comprising test sample based on test is tested the dielectric constant of microfluid,
Detailed process is：The amplitude and phase of scattering parameter caused by tested microfluids of the finite element FEM to different electrical characteristics are used first
Position information is emulated, and a large amount of sample needed for training neural network is obtained；Secondly the suitable neural network of selection and algorithm,
The relationship between the scattering parameter information and the dielectric property of tested microfluid of test is established, the sample data training being used in combination
Neural network constantly regulates and controls the parameter of neural network until reaching network has the ability intelligently exported, i.e. network can foundation
Continually changing input information correctly provides output information；Finally by the scattering parameter of measuring device caused by different samples
Information input to trained network, the dielectric property of measured object will be joined by trained network according to the scattering of its test
Number information correctly exports.
The utility model proposes microfluid electrical characteristics microwave detecting device all using coplanar waveguide transmission line and the line of rabbet joint
Construction, and each section is not necessarily to welding lead, it is easy to carry, it is easy to be integrated into the potential quality of micro-analysis system with other circuits.
Embodiment above describes the basic principles and main features of the utility model and advantage, the technical staff of the industry
It should be appreciated that the present utility model is not limited to the above embodiments, the above embodiments and description only describe this
The principle of utility model, under the range for not departing from the utility model principle, the utility model also has various changes and improvements,
These changes and improvements are each fallen in the range of the utility model protection.
Claims (3)
1. the microfluid dielectric property detection device based on coplanar waveguide transmission line, it is characterised in that including coplanar waveguide transmission line
And two symmetrical compound detail I and compound detail II, compound detail I of loaded in series conduction band among coplanar waveguide transmission line
It is made of the line of rabbet joint detail of multiple open-ends with compound detail II, compound detail I is equipped with for placing test sample
Test zone, compound detail II are used to enhance the electric field strength of test zone on compound detail I and meet impedance matching and then carry
The sensitivity of high detection and accuracy are equipped with spacing for ensureing signal normal transmission between compound detail I and compound detail II
Without being passed through sub-miniature A connector and vector network analyzer respectively by the input port and output port of crosstalk, coplanar waveguide transmission line
It is connected.
2. the microfluid dielectric property detection device according to claim 1 based on coplanar waveguide transmission line, feature exist
In：The sample, which is blocks of solid, can be directly placed at test zone, and sample, which is fluid or solid powder, to be passed through
Arc type microflow channels are loaded in test zone, which is pasted onto test zone by conducting resinl.
3. the microfluid dielectric property detection device according to claim 1 based on coplanar waveguide transmission line, feature exist
In：The coplanar waveguide transmission line and compound detail I and compound detail II are all made of conventional etch processes and etch on the metal layer
It forms, which is set on medium substrate, and the material of medium substrate is Rogers R4003C, and relative dielectric constant is
3.38, the thickness of medium substrate is 0.8mm, the width point of two bars transmission gap and intermediate conduction band in coplanar waveguide transmission line
Not Wei 0.15mm and 2.3mm, compound detail I and compound detail II be made of the line of rabbet joint detail of 6 open-ends, open-end
Line of rabbet joint detail length and gap width be respectively 1.7mm and 0.15mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147473A (en) * | 2020-09-28 | 2020-12-29 | 哈尔滨理工大学 | Screening method of high-insulation-strength gas |
| CN112162182A (en) * | 2020-09-28 | 2021-01-01 | 哈尔滨理工大学 | Gas dielectric strength prediction method based on neural network |
| CN114200282A (en) * | 2022-02-16 | 2022-03-18 | 阿里巴巴达摩院(杭州)科技有限公司 | Test device and test method for testing by using test device |
| CN116973634A (en) * | 2023-09-25 | 2023-10-31 | 河南师范大学 | Sensor for measuring dielectric constant of liquid and method for measuring concentration of ethanol |
-
2017
- 2017-12-18 CN CN201721771602.2U patent/CN207908584U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147473A (en) * | 2020-09-28 | 2020-12-29 | 哈尔滨理工大学 | Screening method of high-insulation-strength gas |
| CN112162182A (en) * | 2020-09-28 | 2021-01-01 | 哈尔滨理工大学 | Gas dielectric strength prediction method based on neural network |
| CN114200282A (en) * | 2022-02-16 | 2022-03-18 | 阿里巴巴达摩院(杭州)科技有限公司 | Test device and test method for testing by using test device |
| CN116973634A (en) * | 2023-09-25 | 2023-10-31 | 河南师范大学 | Sensor for measuring dielectric constant of liquid and method for measuring concentration of ethanol |
| CN116973634B (en) * | 2023-09-25 | 2024-02-13 | 河南师范大学 | Sensor for measuring dielectric constant of liquid and method for measuring concentration of ethanol |
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Granted publication date: 20180925 Termination date: 20201218 |
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