CN110398636A - Liquid dielectric Sensors & Application based on miniaturization medium resonator antenna - Google Patents
Liquid dielectric Sensors & Application based on miniaturization medium resonator antenna Download PDFInfo
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- CN110398636A CN110398636A CN201910512229.6A CN201910512229A CN110398636A CN 110398636 A CN110398636 A CN 110398636A CN 201910512229 A CN201910512229 A CN 201910512229A CN 110398636 A CN110398636 A CN 110398636A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
- G01R27/2635—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
- G01R27/2635—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells
- G01R27/267—Coils or antennae arrangements, e.g. coils surrounding the sample or transmitter/receiver antennae
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
- G01R27/2635—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells
- G01R27/2676—Probes
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Abstract
The invention belongs to characteristics of liquids detection technique fields, disclose a kind of liquid dielectric Sensors & Application based on miniaturization medium resonator antenna, and the top of dielectric resonator introduces miniature cavities, and the middle position of dielectric resonator introduces short-circuit column.Feed structure is the feed probes positioned at resonator side；Feed probes are located at the side of dielectric resonator, and feed probes are tightly attached to the side of dielectric resonator.The short-circuit column introduced among dielectric resonator, short-circuit column are connected with floor.Dielectric resonator and feed structure are located at the same side on floor.Liquid dielectric sensor of the invention has the characteristics that small in size, structure is simple and highly sensitive, has broad application prospects in liquid sensor field；By introducing short-circuit column among cylindrical dielectric resonator antenna, by its basic mode by HEM11δMode change is TM10δMode.And compared to traditional cylindrical dielectric resonator antenna, TM10δMode is also greatly diminished.
Description
Technical field
The invention belongs to characteristics of liquids detection technique fields more particularly to a kind of based on miniaturization medium resonator antenna
Liquid dielectric Sensors & Application.
Background technique
Currently, the immediate prior art: microwave remote sensor has wide in daily life and industrial production application field
General application.Since working frequency range is high (being often ghz band), microwave remote sensor has small in size, high sensitivity, reliability
By force, the advantages that pollution-free and at low cost, be widely used in temperature detection, building Morphology observation, it is biomedical with
And chemical field.Common microwave remote sensor is applied to be situated between including temperature sensor, pulling force and object changing sensor and substance
Electrical characteristic sensor etc..Liquid dielectric property sensor is due to capableing of the dielectric property of accurate detection different liquids and then discriminating
Not different types of liquid and liquid component have wide in terms of Food Inspection, medicine detection and chemical component identification
Wealthy prospect.
The prior art one, using the microwave resonator with high q-factor, by the different mode in excitation resonator structure,
Quasi- TM mode, the TE mode of rectangular cavities resonator of such as cylindrical waveguide resonator structure, liquid to be tested is injected into
Inspection in resonant cavity, by test resonant frequency with the variation realization of testing liquid dielectric constant to different liquids
It surveys.The size of dielectric resonator described in these technologies usually within 5 to 15cm, the volume of required liquid to be detected also compared with
Greatly, it is possible to cause certain waste.And if measuring trace sample, and will appear inaccurate result.
The prior art second is that using plane form resonator, such as the resonator based on microstrip transmission line and be based on medium
The resonator etc. of integrated waveguide.By observation testing liquid dielectric constant and planar resonant device resonance frequency between relationship,
Determine the dielectric constant of testing liquid.Under normal circumstances, the testing liquid that this method is also required to certain volume could be completed to survey
Examination.
For the prior art third is that traditional resonator structure is combined with microflow control technique, leading to too small amount of liquid can be real
Now detect.In recent years, the development of microflow control technique, this kind of technologies are greatly improved, to be realized using micro solution
Dielectric property detection provides a kind of very good solution thinking.The above several method, due to needing to complete by transmission line technology
Test, therefore, it is necessary to use dual-port microwave transmission line, tests the configured transmission of transmission line, and then obtains analysis knot
Fruit.The test of these methods is complex.
The prior art four is then to use to be loaded onto liquid on the antenna structure with certain resonance frequency, different
The liquid of dielectric constant influences difference to the resonance frequency of antenna, and the resonance frequency by testing antenna is finally inversed by liquid
Dielectric property.This method structure and principle are simple, and the impedance operator for often only needing to test antenna input port can be completed
Test, therefore, this method also receives the concern of people, including microstrip antenna in recent years, and the medium for working in HEM mode is humorous
The different types of antennas such as vibration device antenna are all used to realize the detection of liquid dielectric characteristic.But this method often also needs
It wants the liquid of certain volume that could complete to detect, causes the waste and environmental pollution of liquid.
In conclusion problem of the existing technology is: the existing liquid dielectric based on resonant aerial design passes
Sensor majority size is larger, and the dosage of required testing liquid is also more, be easy to cause the waste and environmental pollution of liquid.And if
Trace sample is measured, and will appear inaccurate result.
Solve the difficulty of above-mentioned technical problem: key of the invention is to find a kind of innovative resonant aerial knot
Structure.Medium resonator antenna gets more and more people's extensive concerning since it has many advantages, such as at low cost, high-efficient, works in HEM mould
The cylindrical dielectric resonator antenna of formula is introduced into the design of liquid sensor, however due to the original of its operating mode
Cause cannot achieve the Miniaturization Design of antenna, so that sensor bulk is larger.Traditional medium resonator antenna structure includes half
Spherical dielectric resonator device antenna, cylindrical dielectric resonator antenna and Rectangular Enclosure with Participating Media resonant aerial apply novel cylinder here
Shape medium resonator antenna: a short-circuit column is introduced among cylindrical dielectric resonator antenna, significantly reduces the ruler of antenna
It is very little.Meanwhile in liquid sensor field, realize that highly sensitive liquid sensor is still to be developed.Utilize the short-circuit column of introducing
Cylindrical dielectric resonator antenna can complete highly sensitive detection in the case where a small amount of liquid sample.
Solve the meaning of above-mentioned technical problem: the present invention is big using the cylindrical dielectric resonator antenna for introducing short-circuit column
The working frequency of the TM01 δ mode reduced greatly can reduce antenna size and then obtain higher sensitivity, significantly needed for detection
The liquid sample volume wanted also greatly is reduced.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of liquid based on miniaturization medium resonator antenna
Dielectric constant sensor and application.
The invention is realized in this way a kind of liquid dielectric sensor based on miniaturization medium resonator antenna,
The liquid dielectric sensor based on miniaturization medium resonator antenna is provided with dielectric resonator and feed structure；
The top of dielectric resonator introduces miniature cavities, and the middle position of dielectric resonator introduces short-circuit column.
Feed structure is the feed probes positioned at resonator side；Feed probes are located at the side of dielectric resonator, feed
Probe is tightly attached to the side of dielectric resonator.
Further, the short-circuit column introduced among dielectric resonator, short-circuit column are connected with floor.
Further, dielectric resonator and feed structure are located at the same side on floor.
Further, the radius r1=5mm of cylindrical dielectric resonator, the radius r2=0.32mm of feed probes, medium
The radius r3=0.32mm of the short-circuit column introduced among resonator, the radius r4=for the miniature cavities that dielectric resonator top introduces
1mm, the height h1=5mm of cylindrical dielectric resonator, the height h2=5mm of feed probes, dielectric resonator centre introduce
Short-circuit column height h3=5mm, the height h4=2mm of the miniature cavities introduced at the top of dielectric resonator, square floor
Side length w_g=50mm.
Another object of the present invention is to provide the liquid based on miniaturization medium resonator antenna described in a kind of application to be situated between
The Food Inspection system of electric constant sensor.Constituent analysis and the ingredient detected to realize food to food to be measured can be passed through
The measurement of content, to achieve the purpose that guarantee food quality.
Another object of the present invention is to provide the liquid based on miniaturization medium resonator antenna described in a kind of application to be situated between
The medical detecting system of electric constant sensor.Disease or injury can result in the metabolite level in blood and significant changes occur,
Wherein metabolin is the compound that human metabolism generates, and can be carried out by testing metabolite concentration to a variety of medicals diagnosis on disease
And monitoring.
Another object of the present invention is to provide the liquid based on miniaturization medium resonator antenna described in a kind of application to be situated between
The chemical component identification systems of electric constant sensor.Liquid dielectric property sensor is due to capableing of accurate detection different liquids
Dielectric property screens different types of liquid and liquid component in turn, thus detect chemical substance heterogeneity type and at
Divide content.
In conclusion advantages of the present invention and good effect are as follows: the present invention passes through in cylindrical dielectric resonator antenna
Between introduce short-circuit column, by its basic mode by HEM11δMode change is TM10δMode.And compared to traditional cylindrical dielectric resonator
Antenna, TM10δMode is also greatly diminished.The resonance frequency of antenna after introducing short-circuit column reaches 5.14GHz, far below not drawing
Enter the TM mode frequency of the antenna of short-circuit column, therefore antenna size is reduced, realizes the purpose of miniaturization.Wherein antenna height
For 5mm, radius 5mm, much smaller than the size of the sensor obtained based on cylindrical waveguide resonator, height 9.5cm, half
Diameter is 6.8cm, and also much smaller than the sensor obtained based on rectangular cavities resonator, bottom edge side length is 11.065cm, is highly
5.45cm。
The present invention carries out Electromagnetic Simulation by simulation software and simulates in medium resonator antenna structure in Different Plane
Electric field and Distribution of Magnetic Field, it can be found that the electric field strength in aerial head is most strong.Miniature cavities are introduced at this for holding
Testing liquid can realize the highly sensitive characteristic of sensor to the maximum extent.The average sensitive of the sensor is obtained through emulating
Degree reaches 47.6MHz/ εr, it is HEM much larger than basic mode mode is based on11δThe traditional cylindrical dielectric resonator of mode is obtained
The average sensitivity 10.28MHz/ ε of sensorr, there is apparent advantage compared with other liquid sensors.The liquid dielectric is normal
The features such as number sensor has structure simple, small in size, high sensitivity and easy processing, has in liquid dielectric sensor field
Wide application prospect.
Compared with prior art, present invention has the advantage that
1, the present invention is among cylindrical dielectric resonator antenna by introducing short-circuit column, by the basic mode mode of script by
HEM11δMode change is TM10δMode, and substantially reduced.The size of antenna is effectively reduced, realizes miniaturization.
2, the TM that the present invention passes through analysis cylindrical dielectric resonator antenna10δMiniature cavities are placed on electric-field strength by mode
Strongest aerial head is spent, higher sensitivity is realized, the average sensitivity of final sensor reaches 47.6MHz/ εr。
3, the configuration of the present invention is simple need to only introduce a short-circuit column i.e. on the basis of traditional cylindrical medium resonator antenna
Its operating mode can be changed to reduce antenna size.It is small in size, antenna height 5mm, radius 5mm, much smaller than cylinder
The height 9.5cm and radius 6.8cm of waveguide resonator, also much smaller than the bottom edge side length 11.065cm and height of rectangular cavities resonator
Spend 5.45cm.High sensitivity, the average sensitivity of sensor reach 47.6MHz/ εr, it is HEM much larger than basic mode mode is based on11δ
The average sensitivity 10.28MHz/ ε of the obtained sensor of traditional cylindrical dielectric resonator of moder.Since structure is simple,
Therefore facilitate processing.
Detailed description of the invention
Fig. 1 is the liquid dielectric sensor provided in an embodiment of the present invention based on miniaturization medium resonator antenna
Structural schematic diagram；
In figure: (a) being sensor structure side view；It (b) is sensor structure top view；
In figure: 1, dielectric resonator；2, feed probes；3, short-circuit column；4, floor；5, miniature cavities.
Fig. 2 is emulation S parameter signal when medium resonator antenna provided in an embodiment of the present invention is not introduced into miniature cavities
Figure.
Fig. 3 is the field pattern in medium resonator antenna Different Plane provided in an embodiment of the present invention；
In figure: being (a) field pattern in the dielectric resonator structure on the face xoz；It (b) is the dielectric resonance on the face xoy
Field pattern in device structure.
Fig. 4 is S parameter schematic diagram of the sensor provided in an embodiment of the present invention when injecting different liquids.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Larger, the required prepare liquid for the existing liquid dielectric sensor majority size based on resonant aerial design
The dosage of body also more problem.The present invention, will be former by introducing short-circuit column among traditional cylindrical medium resonator antenna
This basic mode mode is by HEM11δMode change is TM10δMode greatly reduces TM10δMode effectively reduces the ruler of antenna
It is very little.Miniature cavities are placed on the strongest place of medium resonator antenna electric field strength by Electromagnetic Simulation by the present invention, are realized high
The characteristic of sensitivity.
Technical solution of the present invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, the liquid dielectric provided in an embodiment of the present invention based on miniaturization medium resonator antenna passes
Sensor includes: dielectric resonator 1, feed probes 2, short-circuit column 3, floor 4, miniature cavities 5.
Short-circuit column 3 is introduced among dielectric resonator 1, short-circuit column 3 is connected with floor 4, can change dielectric resonator day
The basic mode mode of line reduces antenna size.Feed probes 2 are located at the side of dielectric resonator 1.
It is provided in an embodiment of the present invention based on miniaturization medium resonator antenna liquid dielectric sensor it is main
Parameter has: r1, r2, r3, r4, h1, h2, h3, h4, w_g.R1=5mm, r2=0.32mm, r3=0.32mm, r4=1mm, h1=
5mm, h2=5mm, h3=5mm, h4=2mm, w_g=50mm.Wherein r1 is the radius of cylindrical dielectric resonator 1, and r2 is
The radius of feed probes 2, r3 are the radiuses of the short-circuit column 3 introduced among dielectric resonator 1, and r4 is drawn at the top of dielectric resonator 1
The radius of the miniature cavities 5 entered, h1 are the height of cylindrical dielectric resonator 1, and h2 is the height of feed probes 2, and h3 is to be situated between
The height of the short-circuit column 3 introduced among matter resonator 1, h4 are the height of the miniature cavities 5 introduced at the top of dielectric resonator 1, w_g
The side length on the floor 4 being square.R1 and h1 is the size of dielectric resonator, influences the resonance frequency of dielectric resonator, r2 and
H2 is the size of feed probes, and for feeding to medium resonator antenna, r3 and h3 are the size for introducing short-circuit column, changes medium
The basic mode mode of resonator, reduction antenna size, the size for the miniature cavities that r4 and h4 are introduced, for holding testing liquid, certainly
The volume for having determined testing liquid changes simultaneously the resonance frequency of antenna.The present invention passes through in cylindrical dielectric resonator antenna
Between introduce short-circuit column, by the basic mode mode of script by HEM11δMode change is TM10δMode, and substantially reduced.Effectively
The size of antenna is reduced, realizes miniaturization.Miniature cavities are placed on the strongest aerial head of electric field strength, are realized higher
Sensitivity, the average sensitivity of final sensor reaches 47.6MHz/ εr。
The cylindrical dielectric resonator 1 of the embodiment of the present invention includes the short-circuit column 3 introduced, and to hold testing liquid
Miniature cavities 5；Feed structure is the feed probes 2 positioned at resonator side.Short-circuit column 3 is located at the centre of dielectric resonator 1,
It is connected with floor 4.Miniature cavities 5 are located at the top of dielectric resonator 1.Dielectric resonator 1 and feed structure are located at floor 4
The same side.
With reference to the accompanying drawing to it is of the invention be exactly that effect is explained in detail.
As shown in Fig. 2, emulation S when middle medium resonator antenna provided in an embodiment of the present invention is not introduced into miniature cavities joins
Number schematic diagram；Curve shows that the resonance frequency of antenna is 5.14GHz, dielectric resonator day when far below column short-circuit for introducing
The TM mode frequency of line can use the size of this characteristic reduction antenna.
As shown in figure 3, the field pattern in middle medium resonator antenna Different Plane provided in an embodiment of the present invention.It can be with
Find out, medium resonator antenna work at this time is in TM10δMode, and it is most strong in the top electric field strength of antenna.Draw at the position
Enter miniature cavities, can be realized highly sensitive dielectric property sensor.
It gives the liquid sensor as shown in figure 4, provided in an embodiment of the present invention to inject dielectric in miniature cavities normal
The S parameter of medium resonator antenna when the different liquid of number.It can be seen that the resonance frequency of antenna is normal with the dielectric of liquid
Several increases and reduce, and this variation relation is nonlinear.The sensor has highly sensitive characteristic.
The present invention by introducing short-circuit column among cylindrical dielectric resonator antenna, by the basic mode mode of script by
HEM11δMode change is TM10δMode, and substantially reduced.Meanwhile passing through analysis cylindrical dielectric resonator antenna
TM10δMiniature cavities are placed on the strongest aerial head of electric field strength, realize higher sensitivity by mode.When it is different to
When survey liquid is added to microcavity, the resonant frequency response of antenna changes, and then completes the detection of liquid dielectric characteristic.Benefit
With ANSYS HFSS electromagnetic simulation software, simulating, verifying has been carried out to designed sensor.Simulation result shows when microcavity body
Product is 5.6mm3(i.e. 0.0056ml), when liquid relative dielectric constant is changed to 60 by 10, the resonance frequency of antenna is by 5.5GHz
It is changed to 4.3GHz, the average sensitivity of sensor is 47.6MHz/ εr。
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of liquid dielectric sensor based on miniaturization medium resonator antenna, which is characterized in that described based on small
The liquid dielectric sensor of type medium resonator antenna is provided with dielectric resonator and feed structure；
The top of dielectric resonator introduces miniature cavities, and the middle position of dielectric resonator introduces short-circuit column.
Feed structure is the feed probes positioned at resonator side；Feed probes are located at the side of dielectric resonator, feed probes
It is tightly attached to the side of dielectric resonator.
2. the liquid dielectric sensor as described in claim 1 based on miniaturization medium resonator antenna, feature exist
In the short-circuit column introduced among dielectric resonator, short-circuit column is connected with floor.
3. the liquid dielectric sensor as described in claim 1 based on miniaturization medium resonator antenna, feature exist
It is located at the same side on floor in, dielectric resonator and feed structure.
4. the liquid dielectric sensor as described in claim 1 based on miniaturization medium resonator antenna, feature exist
In the radius r1=5mm of cylindrical dielectric resonator, the radius r2=0.32mm of feed probes draw among dielectric resonator
The radius r3=0.32mm of the short-circuit column entered, the radius r4=1mm of the miniature cavities introduced at the top of dielectric resonator, it is cylindrical
The height h1=5mm of dielectric resonator, the height h2=5mm of feed probes, the height for the short-circuit column that dielectric resonator centre introduces
Spend h3=5mm, the height h4=2mm, the side length w_g=on square floor of the miniature cavities introduced at the top of dielectric resonator
50mm。
5. a kind of liquid dielectric using based on miniaturization medium resonator antenna described in Claims 1 to 4 any one
The Food Inspection system of sensor.
6. a kind of liquid dielectric using based on miniaturization medium resonator antenna described in Claims 1 to 4 any one
The medical detecting system of sensor.
7. a kind of liquid dielectric using based on miniaturization medium resonator antenna described in Claims 1 to 4 any one
The chemical component identification systems of sensor.
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Cited By (3)
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| CN112259967A (en) * | 2020-11-05 | 2021-01-22 | 西安电子科技大学 | Wide-beam dielectric resonator antenna |
| CN112736427A (en) * | 2020-12-23 | 2021-04-30 | 西安交通大学 | Dual-band dual-circular-polarization mixed dielectric resonator antenna for vehicle-mounted internal device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112259967A (en) * | 2020-11-05 | 2021-01-22 | 西安电子科技大学 | Wide-beam dielectric resonator antenna |
| CN112736427A (en) * | 2020-12-23 | 2021-04-30 | 西安交通大学 | Dual-band dual-circular-polarization mixed dielectric resonator antenna for vehicle-mounted internal device |
| CN112964936A (en) * | 2021-01-30 | 2021-06-15 | 天津理工大学 | Miniature antenna sensor sensitive to dielectric constant of surrounding environment |
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