CN207908583U - A kind of small size samples dielectric constant detection device - Google Patents
A kind of small size samples dielectric constant detection device Download PDFInfo
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- CN207908583U CN207908583U CN201721769979.4U CN201721769979U CN207908583U CN 207908583 U CN207908583 U CN 207908583U CN 201721769979 U CN201721769979 U CN 201721769979U CN 207908583 U CN207908583 U CN 207908583U
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- line
- rabbet joint
- sensor
- dielectric constant
- transmission line
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Abstract
The utility model discloses a kind of small size samples dielectric constant detection devices, including vector network analyzer and sensor, wherein sensor is made of metal layer and medium substrate setting up and down, coplanar waveguide transmission line is etched on metal layer, the coplanar waveguide transmission line is including two bars transmission gap, intermediate conduction band and metal, loaded in series is vertically connected at the both sides of rectangular capacitive by the test zone being made of rectangular capacitive and line of rabbet joint detail, line of rabbet joint detail on intermediate conduction band and the line of rabbet joint detail and two bars transmit gap vertical connection.The test device of the utility model is simple in structure, high sensitivity, and the line of rabbet joint detail of measured zone, that is, rectangular capacitive and both ends on sensor is processed using traditional etching technics, and cheap, difficulty of processing is low, convenient for batch production, it can be achieved that on-line real-time measuremen.
Description
Technical field
The utility model belongs to MMU microwave measurement unit technical field, and in particular to a kind of small size samples dielectric constant detection
Device.
Background technology
As applying for microwave technology constantly obtains in the fields such as biology, cytology, food chemistry and electromagnetic compatibility
Breakthrough development, many emerging cross disciplines are come into being, such as microwave chemical, electromagnetic field biomedicine.However, because of people
It is insufficient with Biomedia or the research of chemical substance interaction mechanism to microwave, result in microwave technology answering in above-mentioned field
With still facing many technical barriers.It is important that Biomedia or the electrical parameter of chemical substance are that reflected microwave interacts therewith
Parameter, it is non-as protein heat denaturation, double-deck plasma membrane, unicellular characteristic and in microwave chemical field such as in field of biology
The research of fuel factor is all the variation expansion research by analyzing biological or chemical substance dielectric property.In these fields
The very small i.e. measurand of research object is microfluid, and caused test signal is more faint, therefore to the sensitive of detection
Degree and accuracy propose very high requirement, and otherwise small-signal caused by these micro volumes will be submerged in test device
In ambient noise.In general the electrical characteristics measurement method of microfluid can be divided into the resonance method and disresonance method, the spy of the resonance method
Point is that have very high sensitivity and accuracy, but belong to narrowband and untouchable test.The characteristics of disresonance method is equipment
Simply, measurement sensitivity is low, but belongs to broadband test, it can be achieved that contact and untouchable measurement.
The electrical measurement method of many small samples is all made of coplanar waveguide transmission line, and conduction band loads miniflow therebetween
Channel, but the electric field of enhancing microchannel is not accounted for, impedance matching is not accounted for yet, entire detection device is caused to power on
The strongest part of magnetic concentrates in the two bars transmission gap of coplanar waveguide transmission line, and microchannel is also needed to using special
Technique be processed, this considerably increases the processing cost of sensor and difficulty, be difficult to batch production and a wide range of
It inside promotes the use of, and is only used for detection fluid sample.In consideration of it, the utility model proposes a kind of small size samples dielectrics
Constant detection device, the detection device are constituted using coplanar waveguide transmission line load microchannel, and microchannel is using multiple total
Surface wave leads open circuit detail, and this greatly enhances the electric fields of test zone, to make detection sensitivity greatly improve, and can be used for
Detect solid sample.
Invention content
There is provided a kind of higher small sizes of simple in structure and measurement sensitivity for the technical issues of the utility model solves
Sample dielectric constant detection device, the detection device can be used for detecting the dielectric property of fluid, powder and blocks of solid.
The utility model adopts the following technical scheme that solve above-mentioned technical problem, a kind of small size samples dielectric constant inspection
Survey device, it is characterised in that including vector network analyzer and sensor, wherein sensor is by metal layer setting up and down and Jie
Matter substrate is constituted, and is etched with coplanar waveguide transmission line on metal layer, the coplanar waveguide transmission line include two bars transmission gap,
Intermediate conduction band and metal, loaded in series is by the test zone being made of rectangular capacitive and line of rabbet joint detail, slot on intermediate conduction band
Line detail is vertically connected at the both sides of rectangular capacitive and the line of rabbet joint detail and two bars transmit gap vertical connection, test section
Domain is connected with coplanar waveguide transmission line, and the input port and output port of coplanar waveguide transmission line pass through sub-miniature A connector and arrow respectively
Network Analyzer is measured to be connected.
Further preferably, the material of the medium substrate is Rogers R4003C, relative dielectric constant 3.38, medium
The thickness of substrate is 0.8mm, and the width of two bars transmission gap and intermediate conduction band is respectively in coplanar waveguide transmission line
0.15mm and 2.3mm, the gap width that two bars transmit load line of rabbet joint detail on gap is 0.15mm, and rectangular capacitive size is
3.4mm*2.8mm。
Further preferably, the test sample, which is blocks of solid, can be directly placed at test zone, and test 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.
The detection method of small size samples dielectric constant detection device described in the utility model, detailed process are：Microwave
Signal is inputted by input port, after tested region, finally reaches output port, passes through the rectangular capacitive of line of rabbet joint detail loaded in series
Make test zone that there is very strong electric field, and meet impedance matching in working band, detection sensitivity is improved, by test sample
It is positioned over test zone, is equivalent on coplanar waveguide transmission line and introduces discontinuous structure, this discontinuous structure will be configured to
Coplanar waveguide transmission line two-port scattering parameter, and the situation of change of scattering parameter carries the letter of test sample dielectric property
Breath finally uses neural network method, Jie of the scattering parameter information inverting test sample comprising test sample based on test
Electric constant.
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 measured zone, that is, rectangular capacitive and both ends on sensor is processed using traditional etching technics, cheap, is added
Work difficulty is low, convenient for batch production, it can be achieved that on-line real-time measuremen.The utility model proposes sensor because load rectangle electricity
Hold and the line of rabbet joint detail at both ends makes test zone have very strong electric field, and meets impedance matching in working band, it is more traditional
Coplanar waveguide transmission line measures, and sensitivity greatly improves, and can be used to the dielectric constant for measuring tiny sampler.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model sensor；
Fig. 2 is the structural schematic diagram of microflow channels in the utility model sensor；
Fig. 3 is the scattering parameter of the utility model sensor；
Scattering parameter when Fig. 4 is the utility model sensor test region load polytetrafluoroethylene (PTFE).
In figure：1- medium substrates, 2- metal layers, 3- coplanar waveguide transmission lines, 4- signal transmissions gap, the centres 5- conduction band,
51- metals, 6- line of rabbet joint details, 7- rectangular capacitives, 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, small size described in the utility model
Sample dielectric constant detection device, including vector network analyzer and sensor, wherein sensor are made of bilayer, and bottom is
Medium substrate 1, upper layer are metal layer 2, and coplanar waveguide transmission line 3 is etched on metal layer 2 comprising two bars transmission seam
Gap 4, intermediate conduction band 5 and metal 51, be loaded with by line of rabbet joint detail 6 and rectangle in intermediate conduction band 5 and far from double-end feed part
The test zone T that capacitance 7 forms, sinual costa detail 6 be vertically connected at the both sides of rectangular capacitive 7 and the line of rabbet joint detail 6 with
Two bars transmit 4 vertical connection of gap, and test zone T connects with coplanar waveguide transmission line 3, coplanar waveguide transmission line 3 it is defeated
Inbound port 8 and output port 9 are connected by sub-miniature A connector with vector network analyzer respectively, are loaded on coplanar waveguide transmission line 3
Test zone T meets the requirement of 50 Ω impedance matchings in working frequency points.If sample is fluid or solid powder, can survey
Pass through the microflow channels for placing sample of conductive glue arc type, structure such as Fig. 2 institutes of the microflow channels on examination region T
Show；If sample, which is fluid, to be placed on by microflow channels on the test zone T of sensor, if sample is solid
It can be directly placed on rectangular capacitive 7 without using microflow channels.The line of rabbet joint detail 6 and rectangular capacitive 7 of load should meet resistance
Anti- matching assembles a large amount of electric field to improve accuracy and the sensitivity of detection again, and the working frequency points of sensor are by being loaded
The size of line of rabbet joint detail 6 and rectangular capacitive 7 influences.
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, and the gap width of the line of rabbet joint detail loaded thereon is 0.15mm, and the size of rectangular capacitive is 3.4mm*
The input port of sensor and output port are connected with vector network analyzer by 2.8mm, when test respectively.
The sample, which is solid, can be directly placed on the measured zone T of measuring device；If the sample
It is fluid or solid powder, measured zone can be placed on by an arc type plastic tube, the arc type plastic tube
As shown in Fig. 2, its size can be customized freely, a diameter of 2mm of the arc type plastic tube of the utility model selection is highly shape
3mm, middle section length are 3mm, which can be pasted onto the measured zone of sensor by conducting resinl.
Fig. 3 is the scattering parameter when sensor proposed does not place any sample, it can be seen from the figure that measuring
Frequency point, reflectance factor S11Down to -28dB, transmission coefficient S21More than -2dB, Fig. 4 is the poly- of sensor load 1mm*1mm*1mm
Scattering parameter after tetrafluoroethene, after comparison diagram 3 and 4 understands the measured object of the small size loaded, the amplitude and phase of scattering parameter
Apparent change has occurred in position, and the utility model is exactly according to such variation, in conjunction with neural network method inverting detected sample
The dielectric property of product.
The electric field of the measured zone of the sensor of proposition is calculated with FEM numerical computations, the results show that rectangle
Capacitance be the utility model proposes the electric field of measured zone of sensor reached 2.0889*105V has reached enhancing and has surveyed
Measure the purpose of region electric field.The utility model proposes sensor compared compared with coplanar waveguide transmission line measurement method, sacrifice band
Width, but the electric field of measured zone is greatly strengthened, improve measurement sensitivity.It can pointedly realize small sample dielectric
The measurement of characteristic.And the utility model proposes sensor size be 15mm*12.5 mm*0.8mm, can easily with
Other circuit arrangements are integrated into micro-analysis system.The sensor that the utility model is proposed is made of coplanar waveguide transmission line,
Biggest advantage is that the size of reasonable arrangement sensor can be needed according to its impedance operator, which passes for co-planar waveguide
The ratio that gap is transmitted in the impedance of defeated line by intermediate conduction band and two bars determines, therefore the utility model can be according to institute's sample
Attribute, feature process more rational size.
Studies have shown that coplanar waveguide transmission line has obtained liking for numerous researchers, allusion quotation in terms of the measurement of dielectric Changshu
Type feature is ultra wide band and preferable sensitivity.Its measuring principle is, when electromagnetic wave is propagated along coplanar waveguide transmission line, in case of
There are other media to surrounding, then the two-port scattering parameter of coplanar waveguide transmission line will change, and for different media,
The change information of scattering parameter is also different.I.e. when sample to be placed on coplanar waveguide transmission line, it is equivalent to and is passing
Discontinuity structure is introduced on defeated line, this discontinuity structure will cause coplanar waveguide transmission line two-port scattering parameter,
And the information for having example dielectric characteristic that the situation of change of scattering parameter carries, neural network method is finally used, based on test
Packet scattering parameter information inverting sample with sample dielectric constant.The utility model is based on above-mentioned microwave and passes
Defeated principle realizes example dielectric characteristic detection, since the strongest part of coplanar waveguide transmission line signal is two bars transmission seam
Gap, and must be placed on the intermediate conduction band of coplanar waveguide transmission line for most of samples, to enhance its electric field, spy is on it
It is loaded with two line of rabbet joint details and rectangular capacitive, the sensor designed in this manner can make test zone electric field increase
By force, allow sample fully by electromagnetic wave influence, to improve detection sensitivity, this is to sacrifice bandwidth as cost
, according to above-mentioned size, the utility model proposes the working frequency points of sensor be 8GHz.
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 small size samples dielectric constant detection device, it is characterised in that including vector network analyzer and sensor,
Middle sensor is made of metal layer and medium substrate setting up and down, coplanar waveguide transmission line is etched on metal layer, this is coplanar
Including two bars transmission gap, intermediate conduction band and metal, loaded in series has by rectangle waveguide transmission line on intermediate conduction band
The test zone of capacitance and the line of rabbet joint detail composition, line of rabbet joint detail be vertically connected at the both sides of rectangular capacitive and the line of rabbet joint detail with
Two bars transmit gap vertical connection, and test zone is connected with coplanar waveguide transmission line, the input terminal of coplanar waveguide transmission line
Mouth and output port are connected by sub-miniature A connector with vector network analyzer respectively.
2. a kind of small size samples dielectric constant detection device according to claim 1, it is characterised in that：The medium base
The material of plate is Rogers R4003C, and the thickness of relative dielectric constant 3.38, medium substrate is 0.8mm, and co-planar waveguide passes
The width of two bars transmission gap and intermediate conduction band is respectively 0.15mm and 2.3mm in defeated line, and two bars are transmitted on gap
The gap width for loading line of rabbet joint detail is 0.15mm, and rectangular capacitive size is 3.4mm*2.8mm.
3. a kind of small size samples dielectric constant detection device according to claim 1, it is characterised in that：The test specimens
Product, which are blocks of solid, can be directly placed at test zone, and test sample, which is fluid or solid powder, to be added by arc type microflow channels
It is loaded in test zone, which is pasted onto test zone by conducting resinl.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721769979.4U CN207908583U (en) | 2017-12-18 | 2017-12-18 | A kind of small size samples dielectric constant detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721769979.4U CN207908583U (en) | 2017-12-18 | 2017-12-18 | A kind of small size samples dielectric constant detection device |
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| Publication Number | Publication Date |
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| CN207908583U true CN207908583U (en) | 2018-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721769979.4U Expired - Fee Related CN207908583U (en) | 2017-12-18 | 2017-12-18 | A kind of small size samples dielectric constant detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169573A (en) * | 2017-12-18 | 2018-06-15 | 河南师范大学 | Small sample dielectric property detection device based on microchannel electric-field enhancing |
| CN112986692A (en) * | 2021-02-03 | 2021-06-18 | 四川大学 | Complex dielectric constant sensor based on medium integrated suspension line, measuring system and measuring method |
-
2017
- 2017-12-18 CN CN201721769979.4U patent/CN207908583U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169573A (en) * | 2017-12-18 | 2018-06-15 | 河南师范大学 | Small sample dielectric property detection device based on microchannel electric-field enhancing |
| CN112986692A (en) * | 2021-02-03 | 2021-06-18 | 四川大学 | Complex dielectric constant sensor based on medium integrated suspension line, measuring system and measuring method |
| CN112986692B (en) * | 2021-02-03 | 2022-05-24 | 四川大学 | Complex dielectric constant sensor based on medium integrated suspension line and measuring system |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180925 Termination date: 20201218 |