CN110470705A - A kind of electric small-size sample dielectric property detection device based on frequency splitting technology - Google Patents
A kind of electric small-size sample dielectric property detection device based on frequency splitting technology Download PDFInfo
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- CN110470705A CN110470705A CN201910859160.4A CN201910859160A CN110470705A CN 110470705 A CN110470705 A CN 110470705A CN 201910859160 A CN201910859160 A CN 201910859160A CN 110470705 A CN110470705 A CN 110470705A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
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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
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Abstract
The electric small-size sample dielectric property detection device based on frequency splitting technology that the invention discloses a kind of, dielectric property detection device is two-port network, and is symmetrical structure, specifically includes bottom metal layer, middle dielectric layer and upper layer metal strap；Wherein, the upper layer metal strap includes the microstrip type Wilkinson power divider of two symmetrical arrangements, two polycyclic split ring resonators and two branches for connecting two microstrip type Wilkinson power divider output ports；In two branches, one is transmission branch, and in addition one is reference arm；The opening of polycyclic split ring resonator is provided with microfluidic channel, for carrying detected fluid, has a transmission zero when unloaded, and after loading measured object, symmetry-violating is to generate two transmission zeros.The present invention can be achieved the detection of electric small-size sample dielectric property, and measurement sensitivity is by the interference of external environment, also achieve plane, it is cheap, be easily integrated and the advantages that low section, there is good practicability.
Description
Technical field
The present invention relates to a kind of wide-band microwave measuring systems of electric small-size sample dielectric property.Belong to Microwave Measurement Technique
Field is more specifically to be related to a kind of highly sensitive dielectric property microwave measurement of artificial electromagnetic material with negative magnetic permeability load
Device.
Background technique
So-called electric small-size sample refers to that the three-dimensional dimension of measured object is much smaller than the operation wavelength of test device, such as dust storm
The detection of single grains of sand dielectric property in physics.It is caused during the test to penetrate due to electric small-size sample volume very little
Frequency signal is very faint, therefore various high sensitivity testing methods are constantly suggested, wherein with nearly zero transmission method and surpassing
The resonance sensor of material structure load is representative.Nearly zero transmission method effectively eliminates biography using double branch measuring technologies
The ambient noise of defeated line substantially increases sensitivity, but electric small-size sample can not be carried.And planar open formula resonance
Electromagnetic beam can be tied in the region of a very little by chamber in resonance, be provided very for the detection of electric small-size sample dielectric property
Practical stage is gradually stepped into good technological means, part research.As document proposes one kind based on planar resonant circuit
Uric acid content detection technique.But influence (such as humidity) of the test method vulnerable to external environment.
Summary of the invention
Insufficient according to prior art, the present invention provides a kind of electric small-size sample dielectric property inspection based on frequency splitting technology
Device is surveyed, which can realize the detection of electric small-size sample dielectric property, and measurement sensitivity is by the interference of external environment,
Also achieve plane, it is cheap, be easily integrated and the advantages that low section, there is good practicability.
The present invention is realized by following technical scheme:
A kind of electric small-size sample dielectric property detection device based on frequency splitting technology, dielectric property detection device is two-port
Network, and be symmetrical structure, specifically include bottom metal layer, middle dielectric layer and upper layer metal strap；Wherein, the upper layer gold
Belonging to tape includes that the microstrip type Wilkinson power divider of two symmetrical arrangements, two polycyclic split ring resonators and connection two are micro-
Two branches of banding pattern Wilkinson power divider output port；In two branches, one is transmission branch, and in addition one is reference
Branch；The opening of polycyclic split ring resonator is provided with microfluidic channel, has a biography for carrying detected fluid, when unloaded
Defeated zero point, after loading measured object, symmetry-violating is to generate two transmission zeros.
Further, the microstrip type Wilkinson power divider includes an input port, two in-phase output end mouths and company
Connect the T junction of input and output port.
Further, it is loaded between two output ports of the microstrip type Wilkinson power divider and prevents two paths of signals phase
The isolation resistance of mutual crosstalk.
Further, two polycyclic split ring resonators are symmetrically connected to the interposition of two branches by a short microstrip line
It sets.
Further, the polycyclic split ring resonator includes the resonant ring I, resonant ring II, resonant ring III, resonance of ecto-entad
Ring IV；Wherein, resonant ring I, resonant ring II, resonant ring III, resonant ring IV have different sizes but opening in the same direction.
Further, microstrip line II and microstrip line III and opening of the resonant ring I including I, two equal length of microstrip line；
Wherein, microstrip line I and two microstrip line II is at the U-shaped connection in right angle；The summation of the length of the length and opening of two microstrip lines III
With the equal length of microstrip line I；The microstrip line I has different length from microstrip line II.
Further, the width of the microstrip line I, microstrip line II and microstrip line III is equal.
Further, the resonant ring II, resonant ring III, resonant ring IV with the layout having the same of resonant ring I.
Further, the resonant ring I, resonant ring II, resonant ring III, left and right is adjacent and neighbouring in resonant ring IV
Interval between two micro-strips is equal, is d；The resonant ring II is 8d smaller than the perimeter of resonant ring I, resonant ring III, resonant ring
IV distinguishes small 8d and 16d than the perimeter of resonant ring II.
Further, the microchannel is first to be covered bottom metal layer with dimethyl siloxane, but by each complementary openings
The place at place, which leaves, not to be covered, in order to load electric small-size sample.
Numerical Simulation is carried out to test device proposed by the present invention by finite element (FEM) algorithm, as the result is shown
The device can realize the detection of electric small-size sample dielectric property in 5.6GHz.Compared with prior art, the present invention has following
The utility model has the advantages that the double branch electric small-size sample dielectric property detection dresses of artificial electromagnetic material with negative magnetic permeability structure provided by the invention
It sets, can be used for the application in the fields such as cytology, large biological molecule reconstruct and protein heat denaturation.Scheme compared with the prior art,
It is also an advantage of the present invention that: the Wilkinson power divider for constructing double branches can effectively avoid the crosstalk of signal between two branches,
To evade the mutual coupling between two polycyclic split ring resonators, the resonant ring of load is multiring structure, and is open a side
To such design can effectively reduce the size of test device, and enhance the electric field of test zone and reference zone, and then improve
The sensitivity of test device, another advantage of the invention are that test device can be improved using frequency splitting technology (symmetry)
Robustness, it is of less demanding to external environment (such as humidity), to widen its application field.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the present invention, for those of ordinary skill in the art, without any creative labor, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is Wilkinson power divider schematic diagram；
Fig. 3 is the schematic diagram of polycyclic split ring resonator；
Fig. 4 is transmission zero schematic diagram of the present invention in zero load；
Transmission zero schematic diagram when Fig. 5 is present apparatus load deionized water.
Specific embodiment
To keep the purposes, technical schemes and advantages of the invention implemented clearer, below in conjunction in the embodiment of the present invention
Attached drawing, technical solution in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or class
As label indicate same or similar element or element with the same or similar functions.Described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to use
It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.Under
Face is described in detail the embodiment of the present invention in conjunction with attached drawing.
The present invention provides the Gao Ling based on a kind of double branches of frequency splitting technology, that is, artificial electromagnetic material with negative magnetic permeability load
Sensitivity device for measuring dielectric characteristics is mainly used in the dielectric property detection of electric small-size sample.Described device mainly includes
Two identical microstrip type Wilkinson power dividers, two polycyclic split ring resonators and two branch compositions.
Specifically, as shown in Figure 1, test device proposed by the present invention is two-port network, and it is symmetrical structure, includes
Three-decker is followed successively by bottom metal layer 1, middle dielectric layer 2 and upper layer metal strap from below to up；Wherein, the upper layer gold
Belong to 4, two polycyclic split ring resonators 7 of microstrip type Wilkinson power divider and connection two that tape includes two symmetrical arrangements
Two branches of microstrip type Wilkinson power divider output port；In two branches, one is transmission branch 5, and in addition one is
Reference arm 6.The opening of polycyclic split ring resonator 7 is provided with microfluidic channel to be had when unloaded for carrying detected fluid
One transmission zero, after loading measured object, symmetry-violating is to generate two transmission zeros.
Polycyclic split ring resonator 7 is connected to the middle position of two branches by one section short microstrip line 8, described with guarantee
Test device has the symmetry of height.
Artificial electromagnetic material with negative magnetic permeability structure is the polycyclic split ring resonator 7 loaded, to improve sensitivity, Te Shiyong
The polycyclic split ring resonator 7 of opening in one direction.For convenient for load electric small-size sample, in measurement and reference zone
(at two polycyclic split ring resonators) devise microchannel using dimethyl silicone polymer (PDMS), that is, use PDMS layer overlay
Thick film, but electric field strongest local (opening) is left, in order to load electric small-size sample.And whole device is using gold-plated
Processing, therefore by this design scheme, it can be achieved that the direct contact type of microfluid is tested, and greatly improves measurement sensitivity.It is surveyed
Examination principle is destroyed according to frequency splitting technology either symmetric form, i.e., when two microchannels load at identical sample or device
When zero load, described device is in symmetrical balance state, then only a transmission zero occurs, when two wake passages load not
With sample when, the balance of described device is broken, it will occur two transmission zeros, this is both frequency dividing of the present invention
Technology, and difference on the frequency between two transmission zeros and amplitude difference reflect the big of tested sample dielectric property and loss characteristic
It is small.The present invention is based only on the frequency splitting technology and realizes the detection of electric small-size sample dielectric property.
As shown in Fig. 2, microstrip type Wilkinson power divider 4 includes 21, two in-phase output end mouths of an input port, connects
Connect the T junction 24 and isolation resistance 9 of input port 21 and output port.
Particularly, the resistance of the input port 21, output port I 22, output port II 23 of microstrip type Wilkinson power divider 4
Resisting is 50 ohm, and the impedance of quarter-wave conversion section 25 is 35 ohm.With the output of microstrip type Wilkinson power divider 4
The impedance of the connected microstrip line (transmission branch 61, reference arm 62 in Fig. 1) of port I 22, output port II 23 is also 50 Europe
Nurse, the impedance of isolation resistance 9 are 100 ohm.
As shown in figure 3, polycyclic split ring resonator 7 includes the rectangular aperture resonant rings of four communication, from outside to inside a deutero-albumose
It is denoted as resonant ring I 31, resonant ring II 32, resonant ring III 33, resonant ring IV 34；Wherein resonant ring I 31 include microstrip line I 35, two
The microstrip line II 36 and microstrip line III 37 and opening 38 of equal length, wherein 36 one-tenth right angles of microstrip line I 35 and microstrip line II connect
It is connected into U-shaped, the length of two microstrip lines III 37 and the equal length with the summation of the length of opening 38 and microstrip line I 35, still
Microstrip line I 35 has different length, all micro-strip tape width W having the same from microstrip line II 36；Same resonant ring
II 32, resonant ring III 33, resonant ring IV 34 and the layout having the same of resonant ring I 31, four resonant rings have identical size
Opening 38；Wherein resonant ring II 32 also includes microstrip line a39 and two sizes identical microstrip line b40 and microstrip line c41 and opens
Mouth 38, microstrip line a39 and microstrip line b40 also connect into U-shaped, the length of both ends microstrip line c41 and the length with opening 38 at right angle
The summation of degree is identical as the length of microstrip line a39, but differs with the length of microstrip line b40.
Between the microstrip line I 35 and microstrip line a39, the interval between microstrip line II 36 and microstrip line b40 is equal,
For d, therefore the small 8d of perimeter for second resonant ring II 32 and first resonant ring I 31 seen from outside to inside；And so on, resonance
The small 8d and 16d of perimeter difference of IV 34 to the second ring III 33, resonant ring resonant ring II 32.
As resonant ring I 31, resonant ring II 32, resonant ring III 33 includes that microstrip line A42 and two sizes are identical
Microstrip line B43 and microstrip line C44 and opening 38, microstrip line A42 and microstrip line B43 also connects into U-shaped, both ends microstrip line at right angle
The length of C44 and and opening 38 length summation it is identical as the length of microstrip line A42, but differed with the length of microstrip line B43.
Resonant ring IV 34 includes microstrip line U46 and two sizes identical microstrip line V47 and microstrip line W49 and opening 38,
Microstrip line U46 and microstrip line V47 also connected at right angle it is U-shaped, the length of both ends microstrip line W49 and with opening 38 length it is total
It is identical with the length of microstrip line U46, but differed with the length of microstrip line V47.Particularly constitute the institute of polycyclic split ring resonator 7
There is microstrip line width W having the same.
To improve sensitivity, reduces the volume of measured object, realize the detection of electric small-size sample.The invention proposes such as scheme
Polycyclic split ring resonator 7 shown in 3, and traditional polycyclic resonant ring is not used, the every phase of the polycyclic resonant ring of traditional concentric rectangles
Between adjacent ring opening be in opposite direction, and the present invention by the opening of all rings in one direction, such design helps
Coupling between enhancing ring, to enhance the electric field strength of opening when resonance, and then greatly improves measurement sensitivity.Especially
Ground is provided with microfluidic channel in the opening that the strongest place of the electric field of the test device of proposition is polycyclic resonant ring, is used for
Carry detected fluid.The design scheme of the microchannel is first to use dimethyl siloxane (PDMS) by undermost metal
Covering, but the strongest place of electric field of each complementary openings ring is left and is not covered, and whole device uses gold-plated processing.
Electric small-size sample body dielectric property testing principle:
It is calculated by device of the finite element to proposition, as the result is shown when the microstrip line I 35 of polycyclic split ring resonator 7, micro-
Length with line II 36 is 10.2mm, 8.3mm, d 0.8mm, W 0.3mm, when the size of opening is 0.78mm, test device
Can occur a transmission zero at 5.6GHz in zero load, particularly, at this point, the input area 3 of described device, output area
Shown in the 10(Fig. 1 of domain) length be 10mm, shown in quarter-wave conversion section 25(Fig. 2) length be 12.96mm, transmission
The length (shown in Fig. 1) of branch 5 and reference arm 6 is 20 mm, therefore the size of the two-port test device proposed is
36.7*56.96mm2。
Test philosophy of the invention is, under no-load condition, test device is in symmetrical balance state, and signal is from test device
Input port input, through first microstrip type Wilkinson power divider 4, the identical signal of two-way is divided into, respectively from the
Two output ports of one microstrip type Wilkinson power divider 4 export, and are transferred in transmission branch 5 and reference arm 6, In
The centre of two branches, signal encounter two polycyclic split ring resonators 7, when two identical polycyclic split ring resonators 7 occur
When resonance, no signal is reached to second output port of test device, to generate a transmission zero.When test zone with
When reference zone loads different objects, the symmetry of primary circuit is destroyed, this will cause test device to generate two transmission zero
Point, this i.e. described frequency splitting technology, and the variation (variations of amplitude and phase) between two transmission zeros reflects tester
The difference (real part and imaginary part) of dielectric property between body and Reference.The present invention is based on above-mentioned principle and realizes electric small-size
The detection of sample dielectric property, due to the frequency splitting technology of use, sensitivity is greatly improved, and is tested not by the shadow of external environment
It rings (such as humidity), improves the robustness of test device, widen it and use field.The biography of test device when Fig. 4 gives zero load
Defeated zero point schematic diagram, Fig. 5 give transmission zero schematic diagram when load deionized water, and present invention may also apply to measure others
Microfluid can also test corrosive solution due to using gold-plated processing.In addition to this, the present invention can also be with
It realizes the detection of blocks of solid and powdered object, if measured object is solid, is not necessarily to microchannel, solid can be placed on
Test zone, it is special to load one layer of liquid glue in test zone and reference zone for the measurement sensitivity for improving blocks of solid, it can
The air gap of tested solid and test device is effectively reduced, and liquid glue has no effect to test result.
Compared with conventional transmission wire testing method, the pole of conventional transmission wire testing method can be broken by introducing frequency splitting technology
Limit, greatly reduces the volume of measured object, it is only necessary to and 120 nanoliters, while it being greatly improved measuring limit, research shows that the present invention proposes
Device be about 0.15% to the resolution ratio of EtOH-DI water, in experimentation, by the device of the described load microchannel
Two ports be connected respectively with two ports of vector network analyzer, the scattering parameter under first test is unloaded obtains Fig. 4, then
The deionized water of 120 nanoliters of injection, obtains corresponding scattering parameter i.e. Fig. 5.In addition to this, present invention may also apply to measure other
Microfluid, due to use gold-plated processing, corrosive solution can also be tested.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, it should be understood by those ordinary skilled in the art that: still
It can modify to a specific embodiment of the invention or some technical features can be equivalently replaced；Without departing from this hair
The spirit of bright technical solution should all cover within the scope of the technical scheme claimed by the invention.
Claims (10)
1. a kind of electric small-size sample dielectric property detection device based on frequency splitting technology, which is characterized in that dielectric property detection
Device is two-port network, and is symmetrical structure, specifically includes bottom metal layer, middle dielectric layer and upper layer metal strap；
Wherein, the upper layer metal strap include the microstrip type Wilkinson power divider of two symmetrical arrangements, two polycyclic open
Mouth resonant ring and two branches for connecting two microstrip type Wilkinson power divider output ports；
In two branches, one is transmission branch, and in addition one is reference arm；
The opening of polycyclic split ring resonator is provided with microfluidic channel, has a biography for carrying detected fluid, when unloaded
Defeated zero point, after loading measured object, symmetry-violating is to generate two transmission zeros.
2. a kind of electric small-size sample dielectric property detection device based on frequency splitting technology according to claim 1, special
Sign is: the microstrip type Wilkinson power divider include an input port, two in-phase output end mouths and connection input and
The T junction of output port.
3. a kind of electric small-size sample dielectric property detection device based on frequency splitting technology according to claim 2, special
Sign is: being loaded between two output ports of the microstrip type Wilkinson power divider and prevents the mutual crosstalk of two paths of signals
Isolation resistance.
4. a kind of electric small-size sample dielectric property detection device based on frequency splitting technology according to claim 1, special
Sign is: two polycyclic split ring resonators are symmetrically connected to the middle position of two branches by a short microstrip line.
5. a kind of electric small-size sample dielectric property detection device based on frequency splitting technology according to claim 1, special
Sign is: the polycyclic split ring resonator includes resonant ring I, resonant ring II, resonant ring III, the resonant ring IV of ecto-entad；
Wherein, resonant ring I, resonant ring II, resonant ring III, resonant ring IV have different sizes but opening in the same direction.
6. a kind of electric small-size sample dielectric property detection device based on frequency splitting technology according to claim 5, special
Sign is: microstrip line II and microstrip line III and opening of the resonant ring I including I, two equal length of microstrip line；
Wherein, microstrip line I and two microstrip line II is at the U-shaped connection in right angle；
The summation of the length of the length and opening of two microstrip lines III and the equal length of microstrip line I；
The microstrip line I has different length from microstrip line II.
7. a kind of electric small-size sample dielectric property detection device based on frequency splitting technology according to claim 6, special
Sign is: the width of the microstrip line I, microstrip line II and microstrip line III is equal.
8. a kind of electric small-size sample dielectric property detection device based on frequency splitting technology according to claim 5, special
Sign is: the resonant ring II, resonant ring III, resonant ring IV with the layout having the same of resonant ring I.
9. a kind of electric small-size sample dielectric property detection device based on frequency splitting technology according to claim 8, special
Sign is: the resonant ring I, resonant ring II, resonant ring III, two adjacent and neighbouring micro-strips of left and right in resonant ring IV
Between interval it is equal, be d；
The resonant ring II is 8d smaller than the perimeter of resonant ring I, and resonant ring III, resonant ring IV distinguish small 8d than the perimeter of resonant ring II
And 16d.
10. a kind of electric small-size sample dielectric property detection device based on frequency splitting technology according to claim 1, special
Sign is: the microchannel is first to be covered bottom metal layer with dimethyl siloxane, but by the place at each complementary openings
It leaves and does not cover, in order to load electric small-size sample.
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