CN108594023A - Material complex dielectric permittivity based on gradation type coaxial resonant cavity tests system and method - Google Patents
Material complex dielectric permittivity based on gradation type coaxial resonant cavity tests system and method Download PDFInfo
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- 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
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Abstract
The step of material complex dielectric permittivity that the present invention provides a kind of based on gradation type coaxial resonant cavity tests system and method, and test system includes gradation type coaxial resonant cavity, coupling device, test method include：1) test and corresponded to when recording non-load sample the resonant frequency f of cavity operating mode0And quality factor q0；2) a diameter of D of sample to be tested is measuredS, thickness dS, sample area is placed it in, the resonant frequency f of respective chamber operating mode after load sample is tested and recordSAnd quality factor qS；3) it utilizes resonant cavity perturbation theoretical, the complex dielectric permittivity of detected materials can be calculated；The present invention realizes the complex dielectric permittivity high precision measurement of microwave dielectric material at normal temperatures, the size of the cavity size and sample needed for low-frequency test can not only be reduced, and completes the complex dielectric permittivity test of liquid and dusty material using the expects pipe fixture of sealed bottom.
Description
Technical field
The invention belongs to microwave material dielectric properties technical field of measurement and test, and in particular to one kind being based on the coaxial resonance of gradation type
The dielectric substance complex dielectric permittivity of chamber tests system and method.
Background technology
With the fast development of the technologies such as igh-speed wire-rod production line, communication, in military equipment, aerospace, radar invisible, micro-
In the various fields such as wave integrated circuit, transmission medium of the high performance microwave material as electromagnetic wave, using also increasingly wider
It is general.In the assessment to microwave material dielectric properties, the complex dielectric permittivity unit for electrical property parameters particularly important as one, to its
Accurate measure is essential.Usual complex dielectric permittivity uses ε=ε0(ε '-j ε ")=ε0ε ' (1-jtan δ) indicates that they are
Two characteristic parameters for interacting most basic between description electric field and material.Decades are passed through to microwave material electric parameters testing
Development, formd a set of more complete subject system.At present.In microwave, millimeter wave frequency band, the survey of dielectric substance
There are many method for testing, but network parameter method resonant cavity method is mainly divided by principle.Network parameter fado is for high loss material
Test, when microwave dielectric is middle low-loss material, the method for generally use is Resonant-cavity Method, and test fixture can be used various
The resonant cavity of various kinds, such as stripline resonator, cylindrical cavity, rectangular cavity, quasi-optical resonator, dielectric resonator
Deng mainly using cylindrical cavity or rectangular cavity, but cavity at this time when wherein low-frequency range is tested using the resonance method
Size will be very big, very heavy, and sample size be also difficult to do it is small.And coaxial resonant cavity with respect to other resonant cavities for,
Main advantage is that when applying it to low frequency, since coaxial transmission line main mould is TEM mode, no minimum cutoff,
Therefore its lateral dimension can be relatively much smaller.Ryotaro Inoue and the Yasuhiko Odat et al. of Japan proposes a kind of utilization
The method of the complex dielectric permittivity of coaxial open cavity test dielectric substance, but this method operates tester and requires
Higher, the stochastic regime that sample is placed in residing for fixture top is affected to result.Bogdan A.Galwas et al. are by direct
Extend coaxial outer conductor length and achieve the effect that open-end, is tested to constitute the coaxial resonant cavities of λ/4, this method is wanted
Ask lateral dimension larger, test frequency range is relatively narrow, and needs the material for adding one piece of known dielectric constant above sample, and error term is therewith
Increase, it is difficult to deduct.
Invention content
It is a kind of coaxially humorous based on gradation type present invention aims at providing in view of defect existing for prior art described above
Shake chamber material complex dielectric permittivity test system and method.
For achieving the above object and other related purposes, the present invention provides a kind of based on gradation type coaxial resonant cavity
Material complex dielectric permittivity tests system, including：
Gradation type coaxial resonant cavity, the gradation type coaxial resonant cavity include outer conductor, the coaxial arrangement of outer conductor inside
Inner wire, outer conductor bottom bottom end cover；The outer conductor, inner wire, upper end cover, bottom end cover are metal, described inside and outside to lead
Body, bottom end cover constitute a gradation type coaxial resonant cavity, and the identical straight line of a slope over 10 is respectively provided in the middle part of the inner and outer conductor
Transition；The ratio of the corresponding outer conductor inner diameter of arbitrary height and inner wire diameter is kept constant on entire resonant cavity, from
And keep the characteristic impedance of internal and external conductor coaxial line everywhere identical always；The height on inner wire top is less than the height on outer conductor top
Degree, the outer conductor close to bottom end cover are equipped with coupling device, and coupling device is connected with vector network analyzer；The outer conductor
Partial sidewall outer surface is uniformly arranged in the circumferential direction to the vertically extending several groove bodies in resonant cavity center, the depth of the groove body on lower side
Degree is less than the sidewall thickness of outer conductor, and being internally provided with for groove body extends to gap of the width of outer conductor inner wall less than groove body.Slot
Body and gap structure can inhibit higher mode well, expand operational frequency bandwidth, effectively reduce influence of the higher mode to main mould, carry
High measuring accuracy.
It is preferred that the outer conductor is divided into the thick outer conductor section of lower end, intermediate gradual change outer conductor section, upper end
Thin outer conductor section；The inner wire be divided into the thick inner wire section of lower end, intermediate gradual change inner wire section, upper end thin inner wire
Section, thick outer conductor section, gradual change outer conductor section, thin outer conductor section inner diameter be respectively b1, b2, b3, thick inner wire section, gradual change
Inner wire section, thin inner wire section diameter be respectively a1, a2, a3, and (b1/a1)=(b2/a2)=(b3/a3).Outside lower end
Conductor and inner wire are all thick cylinder, and the outer conductor inner cavity of intervening fade section and inner wire are all cone, and the outer of top is led
Body and inner wire are all thin cylinder, on the one hand can reduce open end aperture using the gradation type structure, reduce electromagnetic field to
The energy of external radiation improves quality factor；On the other hand, in the outer conductor extended due to open end (i.e. inner wire upper end surface)
Diameter is smaller, and the circular waveguide cutoff frequency higher of formation can make working band wider, while required sample lateral dimension reduces,
Thickness is also thinner.
It is preferred that b1/a1=b2/a2=b3/a3=3.6.The quality factor of coaxial cavity reach maximum at this time.
It is preferred that outer conductor sidewall lower end is symmetrical arranged two through-holes about resonant cavity central axes, used in through-hole
In being inserted into coupling ring, coupling ring is connected by cable with vector network analyzer.
It is preferred that the difference of both inner wire tip height and outer conductor tip height is outer at least more than 1 times
The inner diameter size on conductor top.
It is preferred that further including the closed expects pipe in one end, it is used to hold powder/liquid dielectric inside expects pipe to be measured
The outer diameter of material, expects pipe is identical with the internal diameter on outer conductor top.
It is preferred that the expects pipe is made of polytetrafluoroethylene material.It is because it is multiple using polytetrafluoroethylene (PTFE)
Dielectric constant and loss are relatively low, have certain hardness and are easily worked.
It is preferred that the wall thickness of expects pipe is 1mm.
For achieving the above object and other related purposes, the present invention also provides a kind of using above system to solid material
The method that the complex dielectric permittivity of material is tested, includes the following steps：
Step 1：Gradation type coaxial resonant cavity is connect by coupling ring with microwave coaxial cable, then by cable connection vector
Network Analyzer；
Step 2：The resonant frequency f of cavity is obtained by vector network analyzer measurement0And quality factor q0；
Step 3：Measure a diameter of D of solid sample to be measuredS, thickness dS, sample is put into sample area, i.e. cavity is opened a way
Then the resonant frequency f after load sample is tested in end namely inner wire upper end surfaceSAnd quality factor qS；
Step 4：It is theoretical according to resonant cavity Medium perturbation, the complex dielectric permittivity of solid sample to be measured is calculated.
For achieving the above object and other related purposes, the present invention also provides it is a kind of using above system to powder/
The method that the complex dielectric permittivity of liquid dielectric material is tested, it is characterised in that include the following steps：
Step 1：Gradation type coaxial resonant cavity is connect by coupling ring with microwave coaxial cable, then by cable connection vector
Network Analyzer；
Step 2：Empty sample clamp is put into cavity open end, the empty sample clamp of band is obtained by vector network analyzer measurement
When cavity resonance frequency f0And quality factor q0；
Step 3：Powder/liquid dielectric substance is put into sample clamp, then test holds the humorous of sample rear chamber
Vibration frequency fSAnd quality factor qS；
Step 4：It is theoretical using resonant cavity Medium perturbation, the complex dielectric permittivity of powder/liquid material to be measured is calculated.
Mainly there are equivalent lumped-circuit method, Cavity perturbation for the method for obtaining material complex dielectric permittivity from test data
Numerical algorithms such as method, pattern matching method etc., the principle that main statement is handled using cavity medium perturbation method here.Sample when test
It is positioned over the open end of coaxial resonant cavity, that is to say near field, electromagnetic field can do quasi-static processing.In the present invention, test
Material is all the non-magnetic dielectric material of homogeneous isotropism, i.e.,
ε in formula (1)0、μ0Vacuum complex dielectric permittivity and complex permeability, what ε, μ were indicated respectively be sample multiple dielectric it is normal
Number and complex permeability, ε ', ε ", μ ', μ " are respectively corresponding real part and imaginary part relative value；J is imaginary unit, and w is angular frequency；Sample
Product are placed on the open end of gradation type coaxial resonant cavity, i.e. inner wire upper surface, and the region electric field is most strong and magnetic field is most weak, is placed on this
Dielectric on end face will be electrically polarized, and the polarization charge that the dielectric after polarization generates in turn can produce the electromagnetic field of cavity
To indicate, i.e., raw small perturbation, the electric field that electric field can be generated with polarization charge in dielectric sample at this time are superimposed
Here b=(ε-ε0)/(ε+ε0), q=4 π ε0R0V0,R0It is the radius of open end coaxial resonant cavity inner wire, V0It is
Equivalent voltage between open end internal and external conductor, ε are the complex dielectric permittivities of sample to be tested, and n is the variable in summation formula, and r, z are
Position coordinates under cylindrical coordinate, using plane where the open end of gradation type coaxial resonant cavity as cylindrical-coordinate systemPlane, z-axis
Direction is outside, thenIt is the unit vector in the directions cylindrical-coordinate system r and z respectively.Because microwave energy is concentrated mainly on humorous
Shake intracavitary, the dielectric sample in open circuit endface is little to the disturbance of cavity, therefore classical perturbation theory can be used for from
It measures resonant frequency f and quality factor q seeks the complex dielectric permittivity ε of sample：
In above-mentioned two formula, Δ f=f0-fs, Δ (1/Q)=1/QS-1/Q0, VSIndicate that the volume of sample, V indicate the body of cavity
Product, W indicate that total energy storage in cavity, tan δ=ε "/ε ', Δ ε and Δ μ are to introduce complex dielectric permittivity and complex permeability after sample respectively
Variable quantity,The electric field of intracavitary and magnetic field respectively before and after load sample, N is by cavity and sample ruler
The parameters such as very little, present position field determine that the solution of exact value is complex and since cavity and sample actual size have
Deviation, so can usually be determined by standard specimen calibration process, specifically, by testing multiple known complex dielectric permittivities
Sample fits the relation curve of N values and the front and back relative frequency offset generated of sample load.
And then in actual test, obtained according to cavity and sample size, the Δ f measured and Δ (1/Q) value, and by standard specimen
The N values arrived, you can obtain the complex dielectric permittivity of dielectric sample.
As described above, the material complex dielectric permittivity based on gradation type coaxial resonant cavity of the present invention tests system and method,
It has the advantages that：On the one hand the test system and method for the present invention can reduce sample needed for low-frequency test big
It is small, it saves sample materials and cost, this point is particularly important for precious materials；On the other hand, this method test frequency range is wide, behaviour
Make simplicity, in addition, this method is applicable not only to the complex dielectric permittivity test of low consumption dielectric material, can equally be well applied to middle height
Dielectric substance is lost, and sample to be tested can be solid, can also be powder or liquid.
Description of the drawings
Fig. 1 is the structural schematic diagram of this system.
Fig. 2 is gradation type coaxial resonant cavity structural schematic diagram.
1 is gradation type coaxial resonant cavity, and 2 be vector network analyzer, and 3 be microwave coaxial cable, and 4 fix dress for coupling ring
It sets, 5 be bottom end cover, and 6 be coupling ring, and 7 be thick outer conductor section, and 8 be gradual change outer conductor section, and 9 be thin outer conductor section, and 10 be to be led in thick
Body section, 11 be groove body, and 12 be sample to be tested, and 13 are inserted into hole for coupling ring, and 14 be gap, and 15 be gradual change inner wire section, and 16 be thin
Inner wire section.
Specific implementation mode
Illustrate that embodiments of the present invention, those skilled in the art can be by this theorys below by way of the implementation of specific specific example
Content disclosed by bright book understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different tools
Body embodiment is embodied or practiced, and the various details in this specification can also be based on different viewpoints and application, not have
Various modifications or alterations are carried out under the spirit of the present invention.
Gradation type coaxial resonant cavity 1, the gradation type coaxial resonant cavity include outer conductor, the coaxial arrangement of outer conductor inside
Inner wire, outer conductor bottom bottom end cover 5；The outer conductor, inner wire, upper end cover, bottom end cover are metal, described inside and outside
Conductor, bottom end cover constitute a gradation type coaxial resonant cavity, and it is identical straight that a slope over 10 is respectively provided in the middle part of the inner and outer conductor
Line transition；The ratio of the corresponding outer conductor inner diameter of arbitrary height and inner wire diameter is kept constant on entire resonant cavity,
To keep the characteristic impedance of internal and external conductor coaxial line everywhere identical always；The height on inner wire top is less than outer conductor top
Highly, in the present embodiment, the outer conductor top of the difference at least more than 1 times of both inner wire tip height and outer conductor tip height
The inner diameter size at end.Outer conductor close to bottom end cover is equipped with coupling device, coupling device and 2 phase of vector network analyzer
Connection；In the present embodiment, outer conductor sidewall lower end is symmetrical arranged two coupling rings about resonant cavity central axes and is inserted into hole 13, through-hole
In for being inserted into coupling ring 6, coupling ring 6 is fixed by coupling ring fixing device 4 with cavity, and is passed through cable and divided with vector network
Analyzer is connected.The outer conductor on lower side partial sidewall outer surface be uniformly arranged in the circumferential direction it is vertically extending to resonant cavity center
Several groove bodies 11, the depth of the groove body 11 are less than the sidewall thickness of outer conductor, and being internally provided with for groove body extends in outer conductor
The width of wall is less than the gap 14 of groove body.Groove body and gap structure can inhibit higher mode well, effectively reduce higher mode to master
The influence of mould improves measuring accuracy.
The outer conductor is divided into the thick outer conductor section 7, intermediate gradual change outer conductor section 8, the thin outer conductor section of upper end of lower end
9；The inner wire is divided into the thick inner wire section 10, intermediate gradual change inner wire section 15, the thin inner wire section 16 of upper end of lower end, slightly
Outer conductor section 7, gradual change outer conductor section 8, thin outer conductor section 9 inner diameter be respectively b1, b2, b3, thick inner wire section 10, gradual change
Inner wire section 15, thin inner wire section 16 diameter be respectively a1, a2, a3, and (b1/a1)=(b2/a2)=(b3/a3).This reality
(b1/a1)=(b2/a2)=(b3/a3)=3.6 is applied in example.The quality factor of coaxial cavity reach maximum at this time.The outer of lower end is led
Body and inner wire are all thick cylinder, and the outer conductor inner cavity of intervening fade section and inner wire are all cone, the outer conductor at top
All it is thin cylinder with inner wire, on the one hand open end aperture can be reduced using the gradation type structure, it is outside to reduce electromagnetic field
The energy of radiation improves quality factor；On the other hand, due to the outer conductor internal diameter of open end (i.e. inner wire upper end surface) extension
Smaller, the circular waveguide cutoff frequency higher of formation can make working band wider, while required sample lateral dimension reduces, thick
Degree is also thinner.
When test powders/liquid dielectric detected materials, further includes the closed expects pipe in one end, be used to hold powder inside expects pipe
The outer diameter at end/liquid dielectric detected materials, expects pipe is identical with the internal diameter on outer conductor top.The wall thickness of expects pipe is 1mm.The material
Pipe is made of polytetrafluoroethylene material.It is to have certain because its complex dielectric permittivity and loss are relatively low using polytetrafluoroethylene (PTFE)
It hardness and is easily worked.
The present embodiment also provides a kind of method tested the complex dielectric permittivity of solid material using above system, packet
Include following steps：
Step 1：Gradation type coaxial resonant cavity is connect by coupling ring with microwave coaxial cable 3, then is sweared by cable connection
Measure Network Analyzer；
Step 2：The resonant frequency f of cavity is obtained by vector network analyzer measurement0And quality factor q0；
Step 3：Measure a diameter of D of solid sample to be measuredS, thickness dS, sample is put into sample area, then test adds
Resonant frequency f after load sample productSAnd quality factor qS；
Step 4：It is theoretical according to resonant cavity Medium perturbation, the complex dielectric permittivity of solid sample to be measured is calculated.
The present embodiment, which also provides, a kind of to be surveyed the complex dielectric permittivity of powder/liquid dielectric substance using above system
The method of examination, it is characterised in that include the following steps：
Step 1：Gradation type coaxial resonant cavity is connect by coupling ring with microwave coaxial cable, then by cable connection vector
Network Analyzer；
Step 2：Empty sample clamp is put into cavity open end, the empty sample clamp of band is obtained by vector network analyzer measurement
When cavity resonance frequency f0And quality factor q0；
Step 3：Powder/liquid dielectric substance is put into sample clamp, then test holds the humorous of sample rear chamber
Vibration frequency fSAnd quality factor qS；
Step 4：It is theoretical using resonant cavity Medium perturbation, the complex dielectric permittivity of powder/liquid material to be measured is calculated.
Mainly there are equivalent lumped-circuit method, Cavity perturbation for the method for obtaining material complex dielectric permittivity from test data
Numerical algorithms such as method, pattern matching method etc., the principle that main statement is handled using cavity medium perturbation method here.Sample when test
It is positioned over the open end of coaxial resonant cavity, that is to say near field, electromagnetic field can do quasi-static processing.In the present invention, test
Material is all the non-magnetic dielectric material of homogeneous isotropism, i.e.,
ε in formula (1)0、μ0Vacuum complex dielectric permittivity and complex permeability, what ε, μ were indicated respectively be sample multiple dielectric it is normal
Number and complex permeability, ε ', ε ", μ ', μ " are respectively corresponding real part and imaginary part relative value；J is imaginary unit, and w is angular frequency.Sample
Product are placed on the open end of gradation type coaxial resonant cavity, i.e. inner wire upper surface, and the region electric field is most strong and magnetic field is most weak, is placed on this
Dielectric on end face will be electrically polarized, and the polarization charge that the dielectric after polarization generates in turn can produce the electromagnetic field of cavity
To indicate, i.e., raw small perturbation, the electric field that electric field can be generated with polarization charge in dielectric sample at this time are superimposed
Here b=(ε-ε0)/(ε+ε0), q=4 π ε0R0V0,R0It is the radius of open end coaxial resonant cavity inner wire, V0It is
Equivalent voltage between open end internal and external conductor, ε are the complex dielectric permittivities of sample to be tested, and n is the variable in summation formula, and r, z are
Position coordinates under cylindrical coordinate, using plane where the open end of gradation type coaxial resonant cavity as cylindrical-coordinate systemPlane, z-axis
Direction is outside, thenIt is the unit vector in the directions cylindrical-coordinate system r and z respectively.Because microwave energy is concentrated mainly on humorous
Shake intracavitary, the dielectric sample in open circuit endface is little to the disturbance of cavity, therefore classical perturbation theory can be used for from
It measures resonant frequency f and quality factor q seeks the complex dielectric permittivity ε of sample：
In above-mentioned two formula, Δ f=f0-fs, Δ (1/Q)=1/QS-1/Q0, the volume of VS expression samples, V expression cavitys
Volume, W indicate that total energy storage in cavity, tan δ=ε "/ε ', Δ ε and Δ μ are to introduce complex dielectric permittivity and multiple magnetic conductance after sample respectively
The variable quantity of rate,The electric field of intracavitary and magnetic field respectively before and after load sample, N is by cavity and sample
Size, the parameters such as field of present position determine that the solution of exact value is complex and due to cavity and sample actual size meeting
There is deviation, so can usually be determined by standard specimen calibration process, specifically, by testing multiple known complex dielectric permittivities
Sample, fit the relation curve of the front and back relative frequency offset generated of N values and sample load.
And then in actual test, obtained according to cavity and sample size, the Δ f measured and Δ (1/Q) value, and by standard specimen
The N values arrived, you can obtain the complex dielectric permittivity of dielectric sample.
Above-described embodiment only illustrates the principle of the present invention and its effect, and is not intended to limit the present invention.It is any to be familiar with
The personage of this technology can all modify above-described embodiment or be changed without violating the spirit and scope of the present invention.Therefore,
Such as those of ordinary skill in the art is completed without departing from the spirit and technical ideas disclosed in the present invention
All equivalent modifications or change, should by the present invention claim be covered.
Claims (10)
1. a kind of material complex dielectric permittivity based on gradation type coaxial resonant cavity tests system, which is characterized in that including：Gradation type
Coaxial resonant cavity (1), the gradation type coaxial resonant cavity includes outer conductor, the inner wire that is coaxially disposed inside outer conductor, is led outside
The bottom end cover (5) of body bottom；The outer conductor, inner wire, upper end cover, bottom end cover are metal, the inner and outer conductor, lower end
Lid constitutes a gradation type coaxial resonant cavity, and the identical rectigradation section of a slope over 10 is respectively provided in the middle part of the inner and outer conductor；
The ratio of the corresponding outer conductor inner diameter of arbitrary height and inner wire diameter is kept constant on entire resonant cavity, in keeping
The characteristic impedance of outer conductor coaxial line everywhere is identical always；The height on inner wire top is less than the height on outer conductor top, close
The outer conductor of bottom end cover is equipped with coupling device, and coupling device is connected with vector network analyzer (2)；The outer conductor is on the lower
End part wall outer surface is uniformly arranged in the circumferential direction to the vertically extending several groove bodies (11) in resonant cavity center, the groove body (11)
Depth be less than the sidewall thickness of outer conductor, the width that being internally provided with of groove body extends to outer conductor inner wall is less than the gap of groove body
(14)。
2. the material complex dielectric permittivity according to claim 1 based on gradation type coaxial resonant cavity tests system, feature
It is：The outer conductor is divided into the thick outer conductor section (7) of lower end, the gradual change outer conductor section (8) of centre, the thin outer conductor section of upper end
(9)；The inner wire be divided into the thick inner wire section (10) of lower end, intermediate gradual change inner wire section (15), upper end thin inner wire
Section (16), thick outer conductor section (7), gradual change outer conductor section (8), thin outer conductor section (9) inner diameter be respectively b1, b2, b3, slightly
Inner wire section (10), gradual change inner wire section (15), thin inner wire section (16) diameter be respectively a1, a2, a3, and (b1/a1)=
(b2/a2)=(b3/a3).
3. the material complex dielectric permittivity according to claim 2 based on gradation type coaxial resonant cavity tests system, feature
It is：B1/a1=b2/a2=b3/a3=3.6.
4. the material complex dielectric permittivity according to claim 1 based on gradation type coaxial resonant cavity tests system, feature
It is：Outer conductor sidewall lower end is symmetrical arranged two through-holes about resonant cavity central axes, is used to be inserted into coupling ring in through-hole, couple
Ring is connected by cable with vector network analyzer.
5. the material complex dielectric permittivity according to claim 1 based on gradation type coaxial resonant cavity tests system, feature
It is：The difference of both inner wire tip height and outer conductor tip height is straight at least more than the inner wall on 1 times of outer conductor top
Diameter size.
6. the material complex dielectric permittivity according to claim 1 based on gradation type coaxial resonant cavity tests system, feature
It is：Further include the closed expects pipe in one end, is used to hold powder/liquid dielectric detected materials, the outer diameter of expects pipe inside expects pipe
It is identical with the internal diameter on outer conductor top.
7. the material complex dielectric permittivity according to claim 6 based on gradation type coaxial resonant cavity tests system, feature
It is：The expects pipe is made of polytetrafluoroethylene material.
8. the material complex dielectric permittivity according to claim 6 based on gradation type coaxial resonant cavity tests system, feature
It is：The wall thickness of expects pipe is 1mm.
9. special according to the method that the test system described in claim 1 to 8 tests the complex dielectric permittivity of solid material
Sign is to include the following steps：
Step 1：Gradation type coaxial resonant cavity is connect by coupling ring with microwave coaxial cable, then by cable connection vector network
Analyzer；
Step 2：The resonant frequency f of cavity is obtained by vector network analyzer measurement0And quality factor q0；
Step 3：Measure a diameter of D of solid sample to be measuredS, thickness dS, sample is put into sample area, then test load sample
Resonant frequency f after productSAnd quality factor qS；
Step 4：It is theoretical according to resonant cavity Medium perturbation, the complex dielectric permittivity of solid sample to be measured is calculated.
10. being surveyed to the complex dielectric permittivity of powder/liquid dielectric substance according to the test system described in claim 1 to 8
The method of examination, it is characterised in that include the following steps：
Step 1：Gradation type coaxial resonant cavity is connect by coupling ring with microwave coaxial cable, then by cable connection vector network
Analyzer；
Step 2：Empty sample clamp is put into cavity open end, when being obtained with empty sample clamp by vector network analyzer measurement
Cavity resonance frequency f0And quality factor q0；
Step 3：Powder/liquid dielectric substance is put into sample clamp, then test holds the resonance frequency of sample rear chamber
Rate fSAnd quality factor qS；
Step 4：It is theoretical using resonant cavity Medium perturbation, the complex dielectric permittivity of powder/liquid material to be measured is calculated.
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| CN110007153A (en) * | 2019-03-22 | 2019-07-12 | 金华职业技术学院 | A kind of method of dielectric material spectrometry |
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| CN113092872A (en) * | 2021-03-29 | 2021-07-09 | 北京航空航天大学 | Tunable coaxial resonant cavity for measuring dielectric constant |
| CN113189155A (en) * | 2021-05-11 | 2021-07-30 | 南京邮电大学 | Improved method for measuring dielectric constant based on resonant cavity perturbation method |
| CN113484615A (en) * | 2021-07-29 | 2021-10-08 | 华南理工大学 | Material dielectric constant broadband test structure and test method thereof |
| CN113484615B (en) * | 2021-07-29 | 2022-05-24 | 华南理工大学 | Material dielectric constant broadband test structure and test method thereof |
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