CN207662824U - A kind of microwave remote sensor - Google Patents
A kind of microwave remote sensor Download PDFInfo
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- CN207662824U CN207662824U CN201721771325.5U CN201721771325U CN207662824U CN 207662824 U CN207662824 U CN 207662824U CN 201721771325 U CN201721771325 U CN 201721771325U CN 207662824 U CN207662824 U CN 207662824U
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- line
- rabbet joint
- open
- transmission line
- joint detail
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- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analysing Biological Materials (AREA)
Abstract
The utility model discloses a kind of microwave remote sensors, the line of rabbet joint detail of multiple open-ends including coplanar waveguide transmission line and loaded in series among the coplanar waveguide transmission line on conduction band, the line of rabbet joint detail of the open-end is for electric field and then improves the accuracy detected and sensitivity, the line of rabbet joint detail of open-end is equipped with the test zone for placing tested biological 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 test device of the utility model is simple in structure, high sensitivity, and the line of rabbet joint detail of open-end is processed using traditional etching technics on sensor, 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 biological sample device for measuring dielectric characteristics technical field, and in particular to a kind of microwave sensing
Device.
Background technology
In electromagnetic field biomedical sector, the electrical measurement of biological sample is because it has non-destructive, real-time online detection, exempts from
The advantages that label, high accuracy, obtains the favor of numerous researchers.The microwave device of miscellaneous detection biological sample is not
It is disconnected to be suggested.But because the volume of biological sample is very small, volume proposes the sensitivity and accuracy of detection in a nanoliter magnitude
Very high requirement is gone out, otherwise small-signal caused by these micro volumes will be submerged in the ambient noise of test device.
In general the characteristics of dielectric property measurement method of biological sample can be divided into the resonance method and disresonance method, the resonance method is that have
Very high high sensitivity and very accurate accuracy, but belong to narrowband and untouchable test.The characteristics of disresonance method is equipment
Simply, measurement sensitivity is low but belongs to broadband, it can be achieved that contact and untouchable measurement.Document " Noncontact
Measurement of Complex Permittivity of Electrically Small Samples at
Microwave Frequencies[J]. IEEE Transactions on Microwave Theory & Techniques,
2016, 64(9):2883-2893. " reports realize the dielectric property test of small size samples blocks of solid using the resonance method,
But belong to narrow band detection.Disresonance method is to realize the main method of wide band detection, and transmission/bounce technique is answered in non-the resonance method
With most commonly used.The Measurement by Dielectric Method of many biological samples is all made of coplanar waveguide transmission line, and conduction band adds therebetween
Microchannel is carried, but does not account for the electric field of enhancing microchannel, does not also account for impedance matching, causes entirely to detect dress
It sets the strongest part of electromagnetism to concentrate in two transmission gaps of coplanar waveguide transmission line, and microchannel is also needed to using spy
Different technique is processed, and this considerably increases the processing cost of sensor and difficulty, are difficult to batch production and in big model
It is promoted the use of in enclosing, liquid sample can only be detected.In consideration of it, the utility model proposes a kind of microwave remote sensor, the microwave
Sensor among coplanar waveguide transmission line using multiple co-planar waveguide open circuit details are loaded on conduction band, this greatly enhances tests
The electric field in region, to make detection sensitivity greatly improve, and detectable solid sample.
Invention content
To overcome the strict demand of the attribute in current most of biological sample microwave detecting devices to tested sample, this
Utility model provides a kind of microwave remote sensor, by loading multiple open-ends on the intermediate conduction band of coplanar waveguide transmission line
Line of rabbet joint detail improve detection accuracy and sensitivity.
The utility model adopts the following technical scheme that a kind of microwave remote sensor, feature exists to solve above-mentioned technical problem
In the line of rabbet joint of multiple open-ends including coplanar waveguide transmission line and loaded in series among coplanar waveguide transmission line on conduction band
The line of rabbet joint detail of detail, the open-end for electric field and then improves the accuracy detected and sensitivity, open-end
Line of rabbet joint detail is equipped with the test zone for placing tested biological sample, the input port and output end of coplanar waveguide transmission line
Mouth is connected by sub-miniature A connector with vector network analyzer respectively.
Further preferably, the tested biological sample, which is blocks of solid, can be directly placed at test zone, be tested biology sample
This, which is fluid or solid powder, to be loaded in test zone by arc type microflow channels, which passes through conductive gluing
It is attached to test zone.
Further preferably, the line of rabbet joint detail of the coplanar waveguide transmission line and multiple open-ends is 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, the gap width of the line of rabbet joint detail of open-end is 0.15mm, open-end
Line of rabbet joint detail length be 1.7mm, number be 6.
Measurement method described in the utility model for measuring the microwave remote sensor of biological sample dielectric property, feature
Be the specific steps are：
（1）Determine that the terminal loaded on coplanar waveguide transmission line and in-between conduction band is opened by emulation and practical measure first
The optimum number of the line of rabbet joint detail on road, while determining the actual size of various pieces, then etch media substrate obtains microwave biography
Sensor, the input port and output port at coplanar waveguide transmission line both ends pass through sub-miniature A connector and vector network analyzer phase respectively
Even；
（2）According to microwave transmission characteristic, microwave signal is inputted by input port, the line of rabbet joint detail through open-end, finally
Output port is reached, the line of rabbet joint detail of multiple open-ends of loaded in series makes test zone have very strong electric field, Jin Er great
It is big to improve the accuracy measured and sensitivity, tested biological sample is positioned over test zone, is equivalent in coplanar wave guide transmission
Discontinuous structure is introduced on line, this discontinuous structure will be configured to coplanar waveguide transmission line two-port scattering parameter, and scatter
The situation of change of parameter carries the information of tested biological sample dielectric property, finally uses BP neural network method, based on survey
The scattering parameter information inverting comprising test sample of examination is tested the dielectric property of biological sample.
Further preferably, step（2）Detailed process be：Tested lifes of the finite element FEM to different electrical characteristics is used first
The amplitude of scattering parameter and phase information caused by object sample are emulated, and a large amount of sample needed for training neural network is obtained
This；Secondly the suitable neural network of selection and algorithm, the scattering parameter information for establishing test and the dielectric of tested biological sample are special
Property between relationship, the sample data training neural network being used in combination constantly regulates and controls the parameter of neural network until reach net
There is network the ability intelligently exported, i.e. network can correctly provide output information according to continually changing input information；Finally
By the information input of the scattering parameter of measuring device caused by different samples to trained network, dielectric property will be by just
Really output.
The utility model has the advantages that compared with prior art：Test device is simple in structure, high sensitivity, passes
The line of rabbet joint detail of open-end is processed using traditional etching technics on sensor, and cheap, difficulty of processing is low, raw convenient for batch
Production is, it can be achieved that online real-time broadband detection.The utility model proposes sensor because of the in parallel line of rabbet joint for loading multiple open-ends
Detail makes test zone have very strong electric field, is measured compared with conventional co-planar waveguide transmission line, and measurement sensitivity greatly improves,
It can be used for detecting small biological sample.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model microwave remote sensor；
Fig. 2 is the structural schematic diagram of microflow channels in the utility model microwave remote sensor；
Fig. 3 is the scattering parameter of the utility model microwave remote sensor；
Fig. 4 is the field distribution schematic diagram of the utility model microwave remote sensor test zone.
In figure：1- medium substrates, 2- metal layers, 3- coplanar waveguide transmission lines, 4- signal transmissions gap, the centres 5- conduction band,
51- metals, the line of rabbet joint details of 6- open-ends, 7- test zones, 8- input ports, 9, output port.
Specific implementation mode
The particular content of the utility model is described in detail in conjunction with attached drawing.As shown in Figure 1, microwave described in the utility model passes
Sensor is made of bilayer, and 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 51, in intermediate conduction band 5 and far from double-end feed part
Parallel connection is loaded with the line of rabbet joint detail 6 of multiple open-ends, and the line of rabbet joint detail 6 of the open-end is equipped with for placing tested biology
The test zone 7 of sample can be added if tested biological sample is fluid by the way that arc type microflow channels are added in tested biological sample
It is loaded on test zone 7, can be directly placed on test zone 7 without microflow channels if tested biological sample is solid.Eventually
The line of rabbet joint detail of end open circuit should meet impedance matching and assemble a large amount of electric field again to improve accuracy and the sensitivity of detection,
The microflow channels structure that it is used cooperatively is as shown in Figure 2.The working band of the microwave remote sensor is by the open-end loaded
The influence of line of rabbet joint detail.The material of medium substrate 1 be Rogers R4003C, relative dielectric constant 3.38, medium substrate 1
Thickness is 0.8mm, and the width in the two bars transmission gap 4 of coplanar waveguide transmission line 3 is 0.15mm, coplanar waveguide transmission line 3
The width of intermediate conduction band 5 be 2.3mm, the gap width of the line of rabbet joint detail 6 of the open-end loaded thereon is 0.15mm, terminal
The length of the line of rabbet joint detail 6 of open circuit is 1.7mm, and number is 6.By the input port of microwave remote sensor 8 and output end when test
Mouth 9 is connected with vector network analyzer respectively.
Fig. 3 gives the scattering parameter information of the utility model microwave remote sensor, there it can be seen that the microwave remote sensor
In its reflectance factor of 10-18GHz S11Less than -15dB, transmission coefficient S21More than -2dB, i.e., the microwave remote sensor work frequency
Rate is 10-18GHz, belongs to wide band detection.I broadcast sensor test region electric field and be strongest in whole device and reach this
105V, therefore tested biological sample is loaded in test zone, caused signal can be captured by sensor sensing.And this reality
Size with the microwave remote sensor of novel proposition is 13.8mm*12.5mm*0.8mm, can easily with other circuit arrangements
It is integrated into micro-analysis system.
The measurement method of the microwave remote sensor, the specific steps are：
1, determine that the terminal loaded on coplanar waveguide transmission line and in-between conduction band is opened by emulation and practical measure first
The optimum number of the line of rabbet joint detail on road, while determining the actual size of various pieces, then etch media substrate obtains microwave biography
Sensor, the input port and output port at coplanar waveguide transmission line both ends pass through sub-miniature A connector and vector network analyzer phase respectively
Even；
2, according to microwave transmission characteristic, microwave signal is inputted by input port, and the line of rabbet joint detail through open-end finally arrives
Up to output port, the line of rabbet joint detail of multiple open-ends of parallel connection load makes test zone have very strong electric field, and is working
Meet impedance matching in frequency band, and then greatly improve accuracy and the sensitivity of measurement, tested biological sample is positioned over test
Region is equivalent on coplanar waveguide transmission line and introduces discontinuous structure, and this discontinuous structure will be configured to co-planar waveguide biography
Defeated line two-port scattering parameter, and the situation of change of scattering parameter carries the information of tested biological sample dielectric property, finally
Using BP neural network method, the scattering parameter information inverting comprising test sample based on test is tested the dielectric of biological sample
Characteristic, detailed process are：The amplitude of scattering parameter caused by tested microfluids of the finite element FEM to different electrical characteristics is used first
It is emulated with phase information, obtains a large amount of sample needed for training neural network；Secondly the suitable neural network of selection and
Algorithm establishes the relationship between the scattering parameter information of test and the dielectric property of tested microfluid, the sample number being used in combination
According to training neural network, constantly regulate and control the parameter of neural network until reaching network has the ability intelligently exported, i.e. network can
Correctly to provide output information according to continually changing input information；Finally dissipating measuring device caused by different samples
The information input of parameter is penetrated to trained network, dielectric property will be exported correctly.
The utility model proposes for detect biological sample dielectric property microwave remote sensor, all using coplanar wave
Transmission line and line of rabbet joint construction are led, and each section is not necessarily to welding lead, it is easy to carry, it is easy to be integrated into microanalysis system with other circuits
The potential quality of system, the microwave remote sensor which is proposed are made of coplanar waveguide transmission line, its biggest advantage is that can be with
The size of reasonable arrangement sensor is needed according to impedance operator, which is that the impedance of coplanar waveguide transmission line is led by centre
Band and the ratio in two bars transmission gap determine, therefore the utility model can be processed according to the attribute of institute's sample, feature
More rational size.
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. a kind of microwave remote sensor, it is characterised in that including coplanar waveguide transmission line and loaded in series in coplanar waveguide transmission line
Between multiple open-ends on conduction band line of rabbet joint detail, the line of rabbet joint detail of the open-end for electric field and then improves detection
Accuracy and sensitivity, the line of rabbet joint detail of open-end is equipped with the test zone for placing tested biological sample, coplanar
The input port and output port of waveguide transmission line are connected by sub-miniature A connector with vector network analyzer respectively.
2. a kind of microwave remote sensor according to claim 1, it is characterised in that：The tested biological sample is blocks of solid
It can be directly placed at test zone, tested biological sample, which is fluid or solid powder, can be loaded by arc type microflow channels and tested
Region, the arc type microflow channels are pasted onto test zone by conducting resinl.
3. a kind of microwave remote sensor according to claim 1, it is characterised in that：The coplanar waveguide transmission line and multiple ends
The line of rabbet joint detail of end open circuit is all made of conventional etch processes and etches on the metal layer, which is set to medium substrate
On, the material of medium substrate is Rogers R4003C, and the thickness of relative dielectric constant 3.38, medium substrate is 0.8mm, altogether
The width of two bars transmission gap and intermediate conduction band is respectively 0.15mm and 2.3mm in coplanar waveguide transmission line, open-end
The gap width of line of rabbet joint detail is 0.15mm, and the length of the line of rabbet joint detail of open-end is 1.7mm, and number is 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721771325.5U CN207662824U (en) | 2017-12-18 | 2017-12-18 | A kind of microwave remote sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721771325.5U CN207662824U (en) | 2017-12-18 | 2017-12-18 | A kind of microwave remote sensor |
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| Publication Number | Publication Date |
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| CN207662824U true CN207662824U (en) | 2018-07-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051455A (en) * | 2017-12-18 | 2018-05-18 | 河南师范大学 | A kind of microwave remote sensor for being used to measure biological sample dielectric property |
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2017
- 2017-12-18 CN CN201721771325.5U patent/CN207662824U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051455A (en) * | 2017-12-18 | 2018-05-18 | 河南师范大学 | A kind of microwave remote sensor for being used to measure biological sample dielectric property |
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Granted publication date: 20180727 Termination date: 20201218 |