CN107132420A - The microwave complex dielectric constant test system and method for low loss dielectric powder or liquid - Google Patents
The microwave complex dielectric constant test system and method for low loss dielectric powder or liquid Download PDFInfo
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- CN107132420A CN107132420A CN201710220506.7A CN201710220506A CN107132420A CN 107132420 A CN107132420 A CN 107132420A CN 201710220506 A CN201710220506 A CN 201710220506A CN 107132420 A CN107132420 A CN 107132420A
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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
- G01R27/2623—Measuring-systems or electronic circuits
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Abstract
The invention discloses the microwave complex dielectric constant test system and method for a kind of low loss dielectric powder or liquid, belong to microwave testing field.The microwave complex dielectric constant test system of the low loss dielectric powder or liquid includes Network Analyzer, Special-purpose testing jig and coaxial cable, the Special-purpose testing jig includes upper semiclosed resonator semiclosed resonator with, the upper semiclosed resonator and under be provided with specimen holder between semiclosed resonator, the upper center of the specimen holder is provided with the first blind hole for placing sample, the upper semiclosed resonator is provided with coupling probe with on semiclosed resonator, and the coupling probe is connected by the coaxial cable with Network Analyzer.The present invention does not result in damage to sample or lost, and simple in construction, easy to operate, testing efficiency is high and test accuracy is high.
Description
Technical field
The present invention relates to microwave testing field, the microwave for particularly relating to a kind of low loss dielectric powder or liquid is situated between again
Electric constant test system and method.
Background technology
Microwave material has been widely used in the every field of microwave as electromagnetic transmission medium, such as microwave circuit,
Communication, missile guidance, electronic countermeasure, radar invisible, remote sensing and remote measurement etc..For non-magnetic media material, multiple dielectric is normal
Number (i.e. two parameters of relative dielectric constant and dielectric loss angle tangent) is the Main Basiss for evaluating non-magnetic media material property,
It is also the important parameter for carrying out microwave components design.Therefore, apply or research and develop this kind of material be used for Aero-Space, communication and
During the fields such as information technology, people must assess the complex dielectric permittivity size under its specific frequency by testing first.In recent years
Come, the requirement more and more higher with high-tech area to frequency microwave component, people become more concerned with associated materials in microwave
The complex dielectric permittivity of wave band.
For block dielectric substance, according to its different qualities, the resonance method, transmission method, transmission can be used at present
The many kinds methods such as line terminal method, free-space Method measure its complex dielectric permittivity.Wherein, the resonance method is to be put into sample
In resonator, determine that the multiple dielectric of sample is normal according to the change of its resonant frequency and quality factor before and after sample is put into
Number, it is that complex-permittivity measurement uses a kind of more method, and its accuracy of measurement is also highest.
For medium dusty material, it usually needs in advance by its dry-pressing into specific bulk shape, then using with block
The principles such as the similar the resonance method of body, transmission method are measured.The major defect of this kind of method is：
(1) for different method of testings, it is necessary to by the dry-pressing of medium powder into different shapes, it is necessary to prepare specific mould
Tool；
(2) dry-pressing formed sample is easily damaged, so that Contamination measurement fixture, causes measurement result inaccurate；
(3) material for not easy-formation is, it is necessary to using binding agent, and binding agent can influence the accurate of measurement result in itself
Property.
It is general using opening coaxial transmission line probe for liquid medium, it usually needs be placed in special container,
Transmission-wire terminal method is made to measure, and this method is typically only suitable for the larger liquid of measurement loss, to low-loss liquid
Measurement accuracy error is larger.
The content of the invention
Damage or loss, and structure are not resulted in sample the technical problem to be solved in the present invention is to provide a kind of
Be simple and convenient to operate, high and the high low loss dielectric powder of test accuracy or liquid the microwave complex dielectric constant of testing efficiency
Test system and method.
In order to solve the above technical problems, present invention offer technical scheme is as follows：
A kind of test system of the microwave complex dielectric constant of low loss dielectric powder or liquid, including Network Analyzer, specially
With test fixture and coaxial cable, the Special-purpose testing jig includes upper semiclosed resonator semiclosed resonator and setting with
In the upper semiclosed resonator and under specimen holder between semiclosed resonator, the upper center of the specimen holder is provided with use
In the first blind hole for placing sample, the upper semiclosed resonator is provided with coupling with and visited on semiclosed resonator
Pin, the coupling probe is connected by the coaxial cable with Network Analyzer.
Further, the diameter of first blind hole be more than the upper semiclosed resonator intracavity diameter and under it is semiclosed
The intracavity diameter of resonator, and the outer wall of outer diameter semiclosed resonator with less than the upper semiclosed resonator is straight
Footpath.
Further, second blind hole coaxial with first blind hole, described are provided with above first blind hole
The diameter of two blind holes is more than the diameter of first blind hole, is provided with below the specimen holder coaxial with first blind hole
3rd blind hole, the upper semiclosed resonator and under semiclosed resonator be closely fastened on second blind hole respectively and the 3rd blind
Kong Shang.
Further, second blind hole is identical with the diameter of the 3rd blind hole, the upper semiclosed resonator and lower half envelope
The size for closing resonator is identical.
Further, the specimen holder is dielectric loss<1×10-4The dielectric material of ultra-low loss below magnitude.
Further, the upper semiclosed resonator is respectively arranged with first through hole with on the side wall of semiclosed resonator
With the second through hole, two coupling probes are each passed through the first through hole and the second through hole.
Further, the material of the specimen holder is quartz glass or silica monocrystalline.
A kind of microwave complex dielectric constant method of testing of low loss dielectric powder or liquid, including：
Step 1：Build above-mentioned test system；
Step 2：Sample is not placed in the specimen holder, the regulation coupling probe is in upper semiclosed resonator with
Depth in semiclosed resonator, the peak value f at the characteristic resonance peak of a certain feature mode is measured using the Network Analyzer1With
Quality factor q1；
Step 3：The specimen holder is removed from the test system, sample is placed in the specimen holder, it
Afterwards by the specimen holder be arranged on the upper semiclosed resonator and under between semiclosed resonator, utilize the Network Analyzer
Measure the peak value f at the characteristic resonance peak of character pair pattern2And quality factor q2；
Step 4：Calculate the relative dielectric constant and dielectric loss angle tangent of sample.
The invention has the advantages that：
Compared with prior art, the microwave complex dielectric constant test system of low loss dielectric powder of the invention or liquid and
Method is tested the complex dielectric permittivity of medium powder or liquid based on the resonance method, than other surveys based on transmission/bounce technique
Method for testing has higher testing efficiency and test accuracy.Wherein test system of the invention is low using fixed long cell method measurement
The complex dielectric permittivity of lossy medium powder or liquid, by the way that resonator is divided into upper semiclosed resonator semiclosed resonance with
Chamber, and by for place the sample of sample be placed on upper half closing resonator and under between semiclosed resonator.In test
When, first measure specimen holder in do not have place sample when a certain feature mode characteristic resonance peak peak value and quality because
Number；Then measurement specimen holder the first blind hole in place sample when same feature mode characteristic resonance peak peak value and
Quality factor, then can calculate the relative dielectric constant and medium of sample according to the peak value and quality factor of resonance peak
Loss tangent value.The present invention by upper semiclosed resonator and under specimen holder, and sample are set between semiclosed resonator
The first blind hole is set to place sample on frame.When sample be low loss dielectric powder or liquid when, sample without
Specially treated is needed, can directly be tested after powder press-in or liquid are poured into the first blind hole of specimen holder, and in test
During damage do not resulted in measured medium powder or liquid or lose, developed or research technique does not influence on follow-up.This
The test system structure of the low loss dielectric powder of invention or the microwave complex dielectric constant of liquid is simple, easy to operate, only needs to survey
Place in test agent frame before sample and place after sample in resonator the peak value at the characteristic resonance peak of a certain pattern and
The multiple dielectric that quality factor can calculate the relative dielectric constant and Dielectric loss tangent value of sample, i.e. sample is normal
Number.
Brief description of the drawings
Fig. 1 for the present invention low loss dielectric powder or liquid microwave complex dielectric constant test system structural representation
Figure；
Fig. 2 is specimen holder in the test system of the microwave complex dielectric constant of low loss dielectric powder or liquid of the invention
Structural representation；
Fig. 3 is the top view of the specimen holder shown in Fig. 2.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
On the one hand, the present invention provides a kind of test system of the microwave complex dielectric constant of low loss dielectric powder or liquid,
As shown in Figure 1 to Figure 3, including Network Analyzer 1, Special-purpose testing jig 3 and coaxial cable 2, Special-purpose testing jig 3 includes upper half
Closing resonator 3-1 and under semiclosed resonator 3-3 and be arranged at semiclosed resonator 3-1 and under semiclosed resonator 3-3
Between specimen holder 3-2, specimen holder 3-2 upper center is provided with the first blind hole 3-2-1 for placing sample 4, on
Semiclosed resonator 3-1 is provided with coupling probe 3-4 with on semiclosed resonator 3-3, and coupling probe 3-4 passes through coaxial electrical
Cable 2 is connected with Network Analyzer 1.
The low loss dielectric powder of the present invention or the microwave complex dielectric constant test system of liquid are based on the resonance method to medium
The complex dielectric permittivity of powder or liquid is tested, and has higher test than other method of testings based on transmission/bounce technique
Efficiency and test accuracy.Wherein test system of the invention is using fixed long cell method measurement low loss dielectric powder or liquid
Complex dielectric permittivity, by the way that resonator is divided into upper semiclosed resonator semiclosed resonator with, and will be used to place detected sample
The sample of product be placed on upper half closing resonator and under between semiclosed resonator.In test, measure do not have in specimen holder first
There are the peak value and quality factor at the characteristic resonance peak of a certain feature mode when placing sample；Then the first of specimen holder is measured
The peak value and quality factor at the characteristic resonance peak of the same feature mode in blind hole during placement sample, then according to resonance peak
Peak value and quality factor can calculate the relative dielectric constant and Dielectric loss tangent value of sample.The present invention by
Upper semiclosed resonator and under set between semiclosed resonator and set the first blind hole to place quilt on specimen holder, and specimen holder
Test sample product.When sample is low loss dielectric powder or liquid, sample is without specially treated, by powder press-in or liquid
Body can be tested directly after pouring into the first blind hole of specimen holder, and to measured medium powder or liquid in test process
Do not result in damage or lose, follow-up development or research technique are not influenceed.The low loss dielectric powder or liquid of the present invention
Microwave complex dielectric constant test system structure it is simple, it is easy to operate, only need to place in test sample frame before sample and
Sample can be calculated by placing the peak value and quality factor at the characteristic resonance peak of a certain pattern in resonator after sample
Relative dielectric constant and Dielectric loss tangent value, i.e. sample complex dielectric permittivity.
When the test system using the present invention is tested the complex dielectric permittivity of sample, in the test of the present invention
System produce electromagnetic field model in, electromagnetic field upper semiclosed resonator 3-1 and under semiclosed resonator 3-3 joint most
By force, being radially outward gradually reduced and along resonator.Due to upper semiclosed resonator 3-1 and under between semiclosed resonator 3-3
There can be the gap caused by specimen holder 3-2, electromagnetic field along specimen holder 3-2 radial direction there can be certain prolong at gap
Stretch.Therefore, in order that sample 4 is covered in the scope of electromagnetic field, the present invention as far as possible, the first blind hole 3-2-1 diameter
Preferably greater than upper semiclosed resonator 3-1 intracavity diameter semiclosed resonator 3-3 with intracavity diameter, and less than upper half
Close resonator 3-1 outer diameter semiclosed resonator 3-1 with outer diameter.
Further, the second blind hole 3- coaxial with the first blind hole 3-2-1 is preferably provided with above the first blind hole 3-2-1
2-2, the second blind hole 3-2-2 diameter are more than the first blind hole 3-2-1 diameter, be provided with below specimen holder 3-2 with it is first blind
The 3rd coaxial hole 3-2-1 blind hole 3-2-3, upper semiclosed resonator the 3-1 semiclosed resonator 3-3 with are closely fastened on respectively
On second blind hole 3-2-2 and the 3rd blind hole 3-2-3.First blind hole 3-2-1 and the second blind hole 3-2-2 formation shoulder holes, upper half envelope
Close resonator 3-1 and under semiclosed resonator 3-3 respectively by being closely fastened on the second blind hole 3-2-2 and the 3rd blind hole 3-2-3
It is upper to be connected with specimen holder 3-2, it is simple in construction, and be easy to specimen holder 3-2 and semiclosed resonator 3-1 and under semiclosed resonator
Dismounting between 3-3.
It is preferred that, the second blind hole 3-2-2 and the 3rd blind hole 3-2-3 diameter can with identical, upper semiclosed resonator 3-1 and
Under semiclosed resonator 3-3 size it is identical.The closing of upper semiclosed resonator 3-1 semiclosed resonator 3-3 formation with is humorous
Shake chamber centre position magnetic field it is most strong, and upper semiclosed resonator 3-1 semiclosed resonator 3-3 with size is identical to make
Sample 4 in specimen holder 3-2 is located at the most strong position of magnetic field in resonator so that the microwave complex dielectric constant of sample
Measured value it is more accurate.
In order to ensure specimen holder 3-2 material does not influence the accuracy of the measurement of the microwave complex dielectric constant of sample 4,
Specimen holder 3-2 is preferably dielectric loss<1×10-4The dielectric material of ultra-low loss below magnitude.Specimen holder 3-2 Jie of itself
Electric constant typically not larger than 5, preferable quartz glass, silica monocrystalline etc., the specimen holder of this material have rigidity it is good,
The characteristics of being unlikely to deform.
Further, upper semiclosed resonator 3-1 and under semiclosed resonator 3-3 side wall on be preferably respectively arranged with the
One through hole 3-1-1 and the second through hole 3-3-1, two coupling probe 3-4 are each passed through first through hole 3-1-1 and the second through hole 3-3-
1.First through hole 3-1-1 and the second through hole 3-3-1 are located at upper semiclosed resonator 3-1 semiclosed resonator 3-3 with respectively
The both sides of center line, coupling probe 3-4 plays a part of microwave signal transmitting-receiving, and can be by through first through hole 3-1-1
Its depth in upper semiclosed resonator 3-1 with in semiclosed resonator 3-3 is adjusted with the second through hole 3-3-1.
On the other hand, the present invention also provides the microwave complex dielectric constant test side of a kind of low loss dielectric powder or liquid
Method, including：
Step 1：Build above-mentioned test system；
Step 2：Do not place sample 4 in specimen holder 3-2, regulation coupling probe 3-4 in upper semiclosed resonator 3-1 and
Under depth in semiclosed resonator 3-3, the peak value f at the characteristic resonance peak of a certain feature mode is measured using Network Analyzer 11
And quality factor q1；
Step 3：Sample 3-2 framves are removed from test system, sample 4 is placed in specimen holder 3-2, afterwards by sample
Product frame 3-2 be arranged on upper semiclosed resonator 3-1 and under between semiclosed resonator 3-3, utilize the measurement correspondence of Network Analyzer 1
The peak value f at the characteristic resonance peak of feature mode2And quality factor q2；
Step 4：Calculate the relative dielectric constant and dielectric loss angle tangent of sample 4.
The low loss dielectric powder of the present invention or the microwave complex dielectric constant method of testing of liquid are based on the resonance method to tested
The complex dielectric permittivity of sample is tested, than other method of testings based on transmission/bounce technique have higher testing efficiency and
Test accuracy.Wherein test system is led to using the complex dielectric permittivity of fixed long cell method measurement low loss dielectric powder or liquid
Cross and resonator is divided into upper semiclosed resonator semiclosed resonator with, and will be placed on for the sample for placing sample
Upper semiclosed resonator and under between semiclosed resonator.In test, measure first in specimen holder without placement sample
When a certain feature mode characteristic resonance peak peak value and quality factor；Then place tested in the first blind hole of measurement specimen holder
The peak value and quality factor at the characteristic resonance peak of same feature mode during sample, then according to the peak value and quality of resonance peak because
Number can calculate the relative dielectric constant and Dielectric loss tangent value of sample.The low loss dielectric powder or liquid of the present invention
The microwave complex dielectric constant method of testing of body is simple, easy to operate, only needs to place before sample and place in test sample frame
The peak value and quality factor at the characteristic resonance peak of a certain pattern can calculate the phase of sample in resonator after sample
To the complex dielectric permittivity of dielectric constant and Dielectric loss tangent value, i.e. sample.
Because sample is in the peak value f at the characteristic resonance peak of a certain feature mode2And quality factor q2Computing Principle and
Method is in pertinent literature (such as periodical《IEEE TRANS.ON MICROWAVE THEORY AND TECHNIQUES》In 1999
Paper disclosed in volume 47 in October in year《Full-Wave Analysis of a Split-Cylinder Resonator for
Nondestructive Permittivity Measurements》) described in, belong to prior art, and not the present invention
Improvement, will not be repeated here.
Now provide the microwave complex dielectric constant test system and method for the low loss dielectric powder or liquid using the present invention
The multiple dielectric of microwave for measuring two kinds of non-magnetic media materials of polytetrafluoroethylene (PTFE) based composite ceramic material powder and hexamethylene liquid is normal
Several embodiments.
Embodiment 1：
A. a kind of Special-purpose testing jig of specific dimensions is made, wherein specimen holder 3-2 can load the polytetrafluoroethyl-ne of sample 4
The thickness of alkenyl ceramic composite powder is 0.5mm, when not putting polytetrafluoroethylene (PTFE) based composite ceramic material powder, is measured
The peak value f at TE011 characteristic resonances peak1For 10.0181GHz and quality factor q1For 16280；
B. specimen holder 3-2 is removed, the powder of polytetrafluoroethylene (PTFE) based composite ceramic material is put into specimen holder 3-2 and pressed
It is real；
C. again by specimen holder 3-2 be placed on upper semiclosed resonator 3-1 and under between semiclosed resonator 3-3, measure
The peak value f at the characteristic resonance peak of correspondence TE011 patterns2For 9.6652GHz and quality factor q2For 3420；
D. the relative dielectric constant for calculating polytetrafluoroethylene (PTFE) based composite ceramic material is 4.09 and dielectric loss angle tangent
For 0.0022.
Embodiment 2：
A. the Special-purpose testing jig 3 of another specific dimensions is made, wherein specimen holder 3-2 can load the hexamethylene of sample 4
The thickness of alkane liquid is 0.5mm, when not putting hexamethylene liquid, measures the peak value f at TE011 characteristic resonances peak1For
20.1239GHz and quality factor q1For 7560；
B. specimen holder 3-2 is removed, hexamethylene liquid is injected in specimen holder 3-2；
C. again by specimen holder 3-2 be placed on upper semiclosed resonator 3-1 and under between semiclosed resonator 3-3, measure
The peak value f at the characteristic resonance peak of correspondence TE011 patterns2For 19.6673GHz and quality factor q2For 6370；
D. the relative dielectric constant for calculating hexamethylene liquid is 2.02 and dielectric loss angle tangent is 0.00029.
The hexamethylene reported in the measurement result and document dielectric properties (dielectric constant of hexamethylene is 2.0~
2.1, loss tangent is about 0.0003~0.0016) basically identical, thus also demonstrate that test system that the present invention provides and
Method is feasible.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. the microwave complex dielectric constant test system of a kind of low loss dielectric powder or liquid, it is characterised in that including network point
Analyzer, Special-purpose testing jig and coaxial cable, the Special-purpose testing jig include upper semiclosed resonator, under semiclosed resonator
And be arranged at the upper semiclosed resonator and under specimen holder between semiclosed resonator, the upper center of the specimen holder sets
The first blind hole for placing sample is equipped with, the upper semiclosed resonator is provided with coupling with on semiclosed resonator
Probe is closed, the coupling probe is connected by the coaxial cable with Network Analyzer.
2. the microwave complex dielectric constant test system of low loss dielectric powder according to claim 1 or liquid, its feature
It is, the diameter of first blind hole is more than the inner chamber of the intracavity diameter of the upper semiclosed resonator semiclosed resonator with
Diameter, and the outer diameter of outer diameter semiclosed resonator with less than the upper semiclosed resonator.
3. the microwave complex dielectric constant test system of low loss dielectric powder according to claim 2 or liquid, its feature
It is, second blind hole coaxial with first blind hole, the diameter of second blind hole is provided with above first blind hole
More than the diameter of first blind hole, threeth blind hole coaxial with first blind hole, institute are provided with below the specimen holder
Semiclosed resonator semiclosed resonator with is stated closely to be fastened on respectively in second blind hole and the 3rd blind hole.
4. the microwave complex dielectric constant test system of low loss dielectric powder according to claim 3 or liquid, its feature
It is, second blind hole is identical with the diameter of the 3rd blind hole, the chi of the upper semiclosed resonator semiclosed resonator with
It is very little identical.
5. tested according to the microwave complex dielectric constant of any described low loss dielectric powder or liquid in Claims 1-4 and be
System, it is characterised in that the specimen holder is dielectric loss<1×10-4The dielectric material of ultra-low loss below magnitude.
6. the microwave complex dielectric constant test system of low loss dielectric powder according to claim 5 or liquid, its feature
It is, the upper semiclosed resonator is respectively arranged with first through hole and the second through hole with on the side wall of semiclosed resonator,
Two coupling probes are each passed through the first through hole and the second through hole.
7. the microwave complex dielectric constant test system of low loss dielectric powder according to claim 5 or liquid, its feature
It is, the material of the specimen holder is quartz glass or silica monocrystalline.
8. the microwave complex dielectric constant method of testing of a kind of low loss dielectric powder or liquid, it is characterised in that including：
Step 1：Build any described test system in claim 1 to 7；
Step 2：Sample is not placed in the specimen holder, the coupling probe is adjusted and is sealed in upper semiclosed resonator and lower half
The depth closed in resonator, the peak value f at the characteristic resonance peak of a certain feature mode is measured using the Network Analyzer1And quality
Factor Q1；
Step 3：The specimen holder is removed from the test system, sample is placed in the specimen holder, afterwards will
The specimen holder be arranged on the upper semiclosed resonator and under between semiclosed resonator, utilize Network Analyzer measurement
The peak value f at the characteristic resonance peak of character pair pattern2And quality factor q2；
Step 4：Calculate the relative dielectric constant and dielectric loss angle tangent of sample.
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