CN110133376B - Microwave sensor for measuring dielectric constant and magnetic permeability of magnetic medium material - Google Patents
Microwave sensor for measuring dielectric constant and magnetic permeability of magnetic medium material Download PDFInfo
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- CN110133376B CN110133376B CN201910389157.0A CN201910389157A CN110133376B CN 110133376 B CN110133376 B CN 110133376B CN 201910389157 A CN201910389157 A CN 201910389157A CN 110133376 B CN110133376 B CN 110133376B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1223—Measuring permeability, i.e. permeameters
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Abstract
The invention discloses a microwave sensor for measuring the dielectric constant and the magnetic permeability of a magnetic medium material. The top layer to the bottom layer comprises a microstrip line structure, a dielectric layer, a metal sheet and a slotted metal CSRR structure; the groove-carved metal CSRR structure is composed of an inner groove ring and an outer groove ring, wherein the inner groove ring and the outer groove ring are both provided with an opening, and the directions of the openings are the same; the two right angles opposite to the openings of the inner groove ring and the outer groove ring are aligned and folded inwards, the openings of the outer groove ring extend outwards towards the inside of the outer groove ring to form grooves, the part between the grooves of the openings of the outer groove ring is an area with the maximum magnetic field intensity, and a sample to be measured is placed in the area to be measured and used for measuring the magnetic conductivity of the sample; the part between the two inward-folded right-angled grooves of the inner groove ring and the outer groove ring is an area with the maximum electric field intensity, and a sample to be measured is placed in the area and used for measuring the dielectric constant of the sample; the method can simultaneously measure the dielectric constant and the magnetic permeability in different areas of the same sensor, has extremely high sensitivity and Q value, and ensures the measuring accuracy.
Description
Technical Field
The invention belongs to the technical field of microwaves, relates to a microstrip line excitation sensor, and particularly relates to a miniaturized microwave sensor for measuring the dielectric constant and the magnetic permeability of a magnetic medium material based on a complementary split-ring resonator (CSRR).
Background
With the rapid development of microwave technology in various industries (such as military, medicine, food, chemical and meteorology fields), various types of radio frequency microwave devices are gradually developed and applied, and meanwhile, because the electromagnetic properties of the magnetic medium materials used by the high-frequency devices greatly influence the performance parameters of equipment devices, the research on the electromagnetic properties of the magnetic medium materials is paid attention.
The electromagnetic property of the magnetic medium material is characterized by three parameters of dielectric constant epsilon, magnetic permeability mu and electric conductivity sigma. The dielectric constant and the magnetic permeability are the most important basic parameters for representing the magnetoelectric performance of the magnetic medium material, and are also important ties for the interaction between substances and electromagnetic fields. There are many methods for measuring permittivity and permeability, and mainly classified into a resonance method and a non-resonance method. The most typical method in the resonance method is the resonant cavity method, and the measurement method has almost no interference of external factors on measurement, so that the method is the most accurate method for measuring the dielectric constant and the magnetic permeability of the magnetic medium material. The design idea of the resonant cavity method is to place a sample to be measured with a fixed size into a set position in the resonant cavity, and then reversely deduce the dielectric constant and magnetic permeability of the sample to be measured according to the change of S parameters of the resonant cavity and the difference of quality factor Q values. In existing miniaturized microwave sensors based on the resonance principle, the dielectric constant and permeability sensing characteristics of the magnetic dielectric material have the same characteristics, i.e. they both lower the resonance frequency. Therefore, the measurement of the dielectric constant and the magnetic permeability of the magnetic medium material are independent of each other, the sensor has a single function, only can be used for measuring a certain parameter, and the dielectric constant and the magnetic permeability cannot be measured simultaneously. In addition, the conventional resonant sensors have a disadvantage that the resolution is reduced as the measurement range is enlarged. That is, the measurement must be performed in a narrow band range, which makes it difficult to measure a magnetic medium material having a high dielectric constant and permeability. The miniaturized sensor improves the practicality simultaneously of the above-mentioned problem of main solution of design of this application structure.
Disclosure of Invention
The invention aims to provide a microwave sensor which is simple in structure, high in sensitivity, high in Q value, wide in measurement range and capable of measuring dielectric constant and magnetic permeability simultaneously, and mainly aims at overcoming the defects of the prior art. The sensor is designed based on a conventional complementary open-loop resonator and transmission line structure.
The invention is realized according to the following technical scheme:
a microwave sensor is a two-port device and comprises a microstrip line structure, a dielectric layer, a metal sheet and a slotted metal CSRR structure from a top layer to a bottom layer;
the microstrip line structure is arranged on the upper surface of the dielectric layer and comprises an input port and an output port which are respectively positioned on two sides of the dielectric layer, the two ports are used for connecting SMA connectors, and the SMA connectors are communicated with the vector network analyzer;
the input port is connected with the output port through three microstrip lines, the three microstrip lines comprise a first microstrip line I, a second microstrip line I and a microstrip line II, one end of the first microstrip line I is welded with one end of the microstrip line II through a 50-ohm resistor, one end of the second microstrip line I is welded with the other end of the microstrip line II through a 50-ohm resistor, and the other ends of the first microstrip line I and the second microstrip line I are respectively used as input and output ports; the first microstrip line I, the microstrip line II and the second microstrip line I are positioned on the same straight line;
furthermore, the width of the microstrip line I is 1.67mm and is used for matching with a 50 omega resistor;
further, the width of the microstrip line II is smaller than that of the microstrip line I;
further, the dielectric layer is a square PCB;
the metal sheet has the same shape as the dielectric layer, is arranged on the lower surface of the dielectric layer, and is etched with a groove-carved metal CSRR structure;
the groove-carved metal CSRR structure is composed of an inner groove ring and an outer groove ring, wherein the inner groove ring and the outer groove ring are respectively provided with an opening, the directions of the openings are the same, and the openings face an input port or an output port; the two right angles opposite to the openings of the inner groove ring and the outer groove ring are aligned and folded inwards, the openings of the outer groove ring extend inwards to form grooves, the parts between the grooves of the openings of the outer groove ring are areas with the largest magnetic field intensity and the smallest electric field intensity, and a sample to be measured is placed in the areas to be used for measuring the magnetic conductivity of the sample; the part between the two inward-folded right-angled grooves of the inner groove ring and the outer groove ring is an area with the largest electric field intensity and the smallest magnetic field intensity, and a sample to be measured is placed in the area and used for measuring the dielectric constant of the sample;
the center of the groove-carving metal CSRR structure is relatively superposed with the center of the microstrip line II on a plane position, the shortest distance d2 between the two ends of the outer side of the groove-carving metal CSRR structure and the two ends of the microstrip line II is 1.45mm, and the microstrip line II is coupled with the groove-carving metal CSRR structure;
the opening width of the inner groove ring of the grooved metal CSRR structure is the same as the width of the opening groove of the outer groove ring.
Furthermore, the size of the outer groove ring of the groove-carved metal CSRR structure is set to be 11mm multiplied by 8mm, the groove width is 0.41mm, the size of the inner groove ring is set to be 6.74mm multiplied by 6.31mm, the groove width is 0.38mm, the distance between the aligned positions of the inner groove ring edge and the outer groove ring edge is set to be 0.22mm, and the reasonable size of the groove-carved metal CSRR structure enables an electric field to be well bound on the periphery of the groove ring;
furthermore, a gap with a certain distance is reserved between the opening groove of the outer groove ring and the opening of the inner groove ring, and the distance is set to be 0.675mm, so that a magnetic field is well bound in the gap;
the sensitivity of the sensor determines the resolution of the permittivity and permeability measurements; the quality factor determines the accuracy of the measurement; the measuring range and miniaturization determine the practicality of the sensor.
Compared with the prior art, the invention has the following prominent substantive characteristics and remarkable technical progress:
compared with the existing microwave sensor, the invention overcomes the defect that the existing sensor can only singly measure the dielectric constant or the magnetic conductivity, can simultaneously measure the dielectric constant and the magnetic conductivity in different areas of the same sensor, has extremely high sensitivity and Q value, and ensures the accuracy of measurement. And the restriction of the slotted metal CSRR structure of the sensor to a strong field is strong, so that the sensitivity is high, meanwhile, the coupling between the microstrip line II and the slotted metal CSRR structure improves the impedance matching of the sensor during resonance, so that the quality factor is improved, and the quality factor is increased along with the expansion of the measurement range, so that the sensor is very suitable for measuring the magnetic medium material with higher dielectric constant and magnetic conductivity.
Drawings
FIG. 1 is a schematic diagram of the structure and parameter labeling diagram of the present invention: wherein (a) a schematic top sensor layer, (b) a schematic bottom sensor layer; (c) a schematic sensor plan view;
FIG. 2 is a schematic of the S parameter of the present invention;
FIG. 3 is a schematic of the field intensity distribution of the present invention: wherein (a) the electric field intensity distribution diagram and (b) the magnetic field intensity distribution diagram;
FIG. 4 is a schematic diagram of the relationship between the transmission coefficient and the dielectric constant and permeability of the sample to be measured according to the present invention: the relation between the transmission coefficient and the dielectric constant of the sample to be measured is shown in the (a) and the relation between the transmission coefficient and the magnetic permeability of the sample to be measured is shown in the (b).
Wherein, 1, SMA connector; 2. a microstrip line I; a 3.50 Ω resistance; 4, PCB board; 5. a microstrip line II; 6. the area with the maximum electric field intensity; a CSRR slot ring; 8. a metal foil; 9. the region of maximum magnetic field strength.
Detailed Description
The present invention will be described in further detail with reference to the following examples in conjunction with the accompanying drawings.
As shown in fig. 1, which is a schematic structural diagram of the present invention, the sensor of the present invention includes a top microstrip line, a middle PCB 4, and a CSRR slot ring 7 etched on a bottom metal sheet 8; the top microstrip line comprises two sections of microstrip lines I2 and II 5, one section of the first microstrip line I and II 5 and the other section of the second microstrip line I and II 5 are respectively welded through two 50-ohm resistors 3, and a feed long pin extends out of the microstrip line I2 and is used for being connected with the SMA connector 1; the microstrip line II 5 is coupled with the CSRR tank ring 7 at the bottom layer;
the groove-carved metal CSRR structure consists of an inner groove ring and an outer groove ring; the inner groove ring and the outer groove ring are respectively provided with an opening, the directions of the openings are the same, two right angles opposite to the openings are inwards folded, two sides of the inwards folded parts are the same, the groove rings are provided with two sensitive areas, the openings of the outer groove rings extend outwards in the grooves, the part between the openings of the outer groove rings is an area 9 with the maximum magnetic field intensity, and a sample to be measured is placed in the area for measuring the magnetic conductivity of the sample; the part between the two inward-folded right-angled grooves of the inner groove ring and the outer groove ring is an area 6 with the maximum electric field intensity, and a sample to be measured is placed in the area for measuring the dielectric constant of the sample;
the width of the gap between the opening groove of the outer groove ring and the opening of the inner groove ring is 0.675 mm.
The sensor design of the invention was carried out in a three-dimensional electromagnetic simulation software AnsysHFSS environment, with relevant dimensions obtained by the software, as shown in the following table:
| parameter(s) | d1 | d2 | wt1 | wt2 | a |
| Numerical value (mm) | 13.93 | 1.45 | 1.67 | 0.4 | 9.52 |
| Parameter(s) | b | c | l | g | w0 |
| Numerical value (mm) | 8 | 6.94 | 3.4 | 0.41 | 0.3 |
| Parameter(s) | w1 | w2 | w3 | p1 | p2 |
| Numerical value (mm) | 0.38 | 0.22 | 0.41 | 0.76 | 0.76 |
Wherein the size of the middle layer PCB board is 35 × 26 × 0.813mm3High frequency board Rogers RO4350 (dielectric constant 3.66, permeability 1, dielectric loss 0.004, permeability loss 0)
As shown in FIG. 2, which is a schematic diagram of the S parameter of the present invention, the resonant frequency of the sensor is 2.36GHz, the Q value is 393, and the higher Q value ensures the high measurement accuracy of the sensor.
Fig. 3 is a schematic diagram of field intensity distribution according to the present invention, wherein (a) is a schematic diagram of electric field intensity distribution, and a region between two slots connected at a right angle inside and outside a slot ring in a CSRR slot ring at a bottom layer is the region with the largest electric field intensity and the smallest magnetic field intensity, so that the region is sensitive to dielectric constant change of a magnetoelectric sample and insensitive to magnetic permeability, and a sample to be measured is placed in the region to measure the dielectric constant of the sample; (b) the magnetic field intensity distribution diagram shows that the magnetic field intensity of the area between the opening grooves of the outer groove ring in the bottom CSRR groove ring is the largest, the electric field intensity is the smallest, therefore, the area is sensitive to the magnetic conductivity change of a magnetoelectric sample and insensitive to the dielectric constant, and the magnetic conductivity of the sample can be measured by placing the sample to be measured in the area.
FIG. 4 is a schematic diagram showing the relationship between the transmission coefficient and the permittivity and permeability of the sample to be measured, wherein (a) is a schematic diagram showing the relationship between the transmission coefficient and the permittivity of the sample to be measured, and a block with a size of 8.8 × 5 × 1mm is placed in the area with the maximum electric field intensity3When the dielectric constant of the sample to be measured is changed from 1 to 10, the resonant frequency of the sensor is reduced from 2.36GHz to 1.77GHz, and the dielectric constant of the sample can be calculated through the variation of the resonant frequency; (b) a block with the size of 3.4 multiplied by 1.12 multiplied by 1mm is arranged in the area with the maximum magnetic field intensity, which is a schematic diagram of the relation between the transmission coefficient and the magnetic permeability of the sample to be measured3When the magnetic permeability of the sample to be measured is changed from 1 to 2, the resonant frequency of the sensor is reduced from 2.36GHz to 2.16GHz, and the magnetic permeability of the sample can be calculated through the change of the resonant frequency. The resonance frequency of the sensor has a large variation range, so that the sensitivity is high. Moreover, along with the expansion of the measurement range, the peak value of the transmission coefficient is unchanged, and high resolution is shown, so that the sensor is very suitable for the measurement of magnetic medium samples with higher dielectric constants and magnetic conductivities, overcomes the limit of narrow-band measurement, and has strong practicability.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification, or with substantial modification.
Claims (7)
1. A microwave sensor for measuring dielectric constant and magnetic conductivity of magnetic medium materials is characterized by being a two-port device which is of a three-layer structure:
the bottom layer comprises a metal sheet; the metal sheet is etched with a notch CSRR structure;
the intermediate layer comprises a dielectric layer;
the top layer comprises a microstrip line, two 50 omega resistors and two SMA connectors;
the microstrip line structure comprises an input port and an output port which are respectively positioned on two sides of the medium layer, the two ports are used for connecting SMA connectors, and the SMA connectors are communicated with the vector network analyzer;
the input port is connected with the output port through three microstrip lines, the three microstrip lines comprise a first microstrip line I, a second microstrip line I and a microstrip line II, one end of the first microstrip line I is welded with one end of the microstrip line II through a 50-ohm resistor, one end of the second microstrip line I is welded with the other end of the microstrip line II through a 50-ohm resistor, and the other ends of the first microstrip line I and the second microstrip line I are respectively used as input and output ports; the first microstrip line I, the microstrip line II and the second microstrip line I are positioned on the same straight line; the microstrip line II is coupled with the groove CSRR structure;
the groove CSRR structure is composed of an inner groove ring and an outer groove ring, the inner groove ring and the outer groove ring are both provided with an opening, the directions of the openings are the same, and the openings face an input port or an output port; the two right angles opposite to the openings of the inner groove ring and the outer groove ring are aligned and folded inwards, the openings of the outer groove ring extend inwards to form grooves, the parts between the grooves of the openings of the outer groove ring are areas with the largest magnetic field intensity and the smallest electric field intensity, and a sample to be measured is placed in the areas to be used for measuring the magnetic conductivity of the sample; the part between the two inward-folded right-angled grooves of the inner groove ring and the outer groove ring is an area with the largest electric field intensity and the smallest magnetic field intensity, and a sample to be measured is placed in the area and used for measuring the dielectric constant of the sample.
2. The microwave sensor for measuring the dielectric constant and the magnetic permeability of a magnetic medium material as claimed in claim 1, wherein the microstrip line ii has a width smaller than the width of the first microstrip line i and the width of the second microstrip line i.
3. A microwave sensor for measuring the dielectric constant and permeability of a magnetic media material as recited in claim 1, wherein the media layer is a square PCB board.
4. The microwave sensor for measuring permittivity and permeability of a magnetic medium material as claimed in claim 1, wherein a center of the notched CSRR structure and a center of the microstrip line ii are relatively coincident in a planar position.
5. The microwave sensor for measuring the dielectric constant and the magnetic permeability of a magnetic medium material as claimed in claim 4, wherein the nearest distance d2 between the two ends of the outer side of the notched CSRR structure and the two ends of the microstrip line II is 1.45 mm.
6. A microwave sensor for measuring the dielectric constant and permeability of a magnetic media material as recited in claim 1, wherein the width of the opening of the inner tank ring is the same as the width of the opening slot of the outer tank ring in the slotted CSRR configuration.
7. The microwave sensor for measuring the dielectric constant and permeability of a magnetic medium material according to claim 1, wherein a gap with a certain distance is left between the groove of the outer tank ring opening and the opening of the inner tank ring of the slotted CSRR structure.
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| CN111426885A (en) * | 2019-01-09 | 2020-07-17 | 华北电力大学（保定） | CSRR microstrip resonance sensor for measuring complex dielectric constant and application thereof |
| CN110531164B (en) * | 2019-08-20 | 2022-05-13 | 杭州电子科技大学 | Microwave sensor for measuring dielectric constant based on SIW-CSRR |
| CN111551880B (en) * | 2020-05-26 | 2021-04-13 | 清华大学 | High-sensitivity magnetic conductivity sensor based on cavity local field enhancement |
| CN112763808B (en) * | 2020-12-29 | 2022-05-27 | 杭州电子科技大学 | Active microwave sensor based on microstrip complementary open-loop resonator structure |
| CN114325118B (en) * | 2021-12-07 | 2023-11-03 | 重庆邮电大学 | Solid material electromagnetic parameter sensor based on CSRR derived structure |
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