CN116706490A - Planar polygonal complementary open-loop microstrip resonator for nondestructive detection - Google Patents
Planar polygonal complementary open-loop microstrip resonator for nondestructive detection Download PDFInfo
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- H—ELECTRICITY
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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- H01P7/082—Microstripline resonators
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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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Abstract
The invention relates to a planar polygonal complementary open-loop microstrip resonator for nondestructive detection, which comprises a grounding plate, wherein a dielectric substrate and a microstrip transmission line are arranged on the grounding plate, and a polygonal complementary open-loop three-dimensional structure is etched on the grounding plate. The three-dimensional structure includes hexagons, octagons, decagons, dodecagons, decaquadrilaterals, decahexagons, and octadegons. The invention has scientific and reasonable design, the polygonal complementary open-loop three-dimensional structure can effectively solve the technical problem of inaccurate detection caused by irregular shape of a test sample, and the actual test condition can be better adapted by setting the complementary open-loop three-dimensional structures with different edge numbers in the specific application process. Experiments prove that the sensitivity to dielectric constant changes gradually decreases with the increase of the edge number of the resonant structure. Under the condition of the same structural parameters, the detection capability of the planar polygonal complementary open-loop microstrip resonator of the invention is better than that of the conventional square and circular resonator structure.
Description
Technical Field
The invention belongs to the technical field of microwave detection, relates to resonator technology, and in particular relates to a planar polygonal complementary open-loop microstrip resonator for nondestructive detection.
Background
Microwave detection is successfully applied as an effective detection means in the aspects of thickness measurement, speed measurement, temperature measurement, humidity measurement, plasma electron density measurement, conductor diameter measurement, ultra-high voltage current measurement and the like. Improving the detection precision is a primary improvement requirement of the detection technology which is always pursued.
The microstrip resonator is used as a planar sensor, has the advantages of natural and easy integration, is convenient to design and simple to manufacture, and can well meet the detection requirements of the current industry. In the prior art, microstrip resonance units with various shapes are applied in the actual industry, wherein the microstrip resonance units are commonly used with sparse finger coupling capacitors, circular resonance rings, defected ground structures and the like, and in the microstrip resonance units, the complementary open-loop resonators are intensively researched and developed by a plurality of researchers due to high measurement precision and high interference resistance.
The complementary open-loop resonator in the prior art mainly comprises square and round shapes, and in industrial test, a test sample often has the characteristic of irregular shape, and at the moment, the rectangular and round open-loop detection structure has the technical problem of being not suitable for irregular sample detection well.
Disclosure of Invention
The planar polygonal complementary open-loop microstrip resonator for nondestructive testing is scientific and reasonable in design, and has stronger dielectric characteristics and better detection adaptability through simulation analysis on different edge number structures and comparison with dielectric characteristic nondestructive testing capabilities of circular and square resonators.
The invention solves the technical problems by adopting the following technical scheme:
planar polygonal complementary open-loop microstrip resonance for nondestructive detectionThe device comprises a grounding plate, wherein a dielectric substrate is arranged on the grounding plate, a microstrip transmission line is arranged on the dielectric substrate, and a polygonal complementary open-loop three-dimensional structure is etched on the grounding plate. The length of a planar polygonal complementary open-loop microstrip resonator formed by etching a grounding plate with a polygonal complementary open-loop three-dimensional structure, a dielectric substrate and a microstrip transmission line is set asl=20-100 mm, width is set asw 1 The height is set to h=0.6 mm, the microstrip transmission line length is set tol=40 mm, width is set asw 2 =1.1mm。
The patent application innovates that polygonal complementary open-loop three-dimensional structures are etched on the base plate, and the open-loop three-dimensional structures comprise hexagons, octagons, decagons, dodecagons, decahexagons and octadegons. The polygonal complementary open-loop three-dimensional structure comprises a complementary inner open-loop structure and an outer open-loop structure, wherein the inner open-loop is concentrically nested in the outer open-loop structure, the open-loop gap of the outer open-loop and the open-loop gap of the inner open-loop are correspondingly arranged at 180 degrees, and the open-loop gap distance of the outer open-loop and the open-loop gap distance of the inner open-loop are g 1 The bandwidth distance of the outer ring-opening and the inner ring-opening is set to g =0.1-0.5 mm 2 The gap distance between the outer ring-opening and the inner ring-opening is set to be =0.1-0.5 mmg 3 =0.1-1 mm, the outer ring width is set toa=1-10mm。
The material of the dielectric substrate is FR 4-epoxy resin.
Moreover, the grounding plate and the microstrip transmission line are made of copper materials.
The invention has the advantages and positive effects that:
the invention has scientific and reasonable design, innovates the etching of the polygonal complementary open-loop three-dimensional structure on the base plate of the resonator, utilizes the characteristic that microwaves have certain penetrating power to realize effective detection of the defects with certain depth inside the insulating material, and the detection process does not need to destroy the material, thus having the excellent characteristic of nondestructive detection; meanwhile, the polygonal complementary open-loop three-dimensional structure can effectively solve the technical problem of inaccurate detection caused by irregular shape of a test sample, and the actual test condition can be better adapted by setting the complementary open-loop three-dimensional structures with different edge numbers in the specific application process; experiments prove that the sensitivity to dielectric constant changes gradually decreases with the increase of the edge number of the resonant structure. Moreover, under the condition of the same structural parameter, the detection capability of the planar polygonal complementary open-loop microstrip resonator is better than that of a common square resonator and a common round resonator, and the hexagonal complementary open-loop resonator is taken as an example, and under the condition of the same variation of dielectric constant, the frequency offset of the planar polygonal complementary open-loop microstrip resonator is improved by 55.12% relative to the square resonator and is improved by 33.8% relative to the round resonator.
Drawings
FIG. 1 is a schematic diagram of a resonator according to the present invention;
FIG. 2 is a schematic diagram of a polygon structure included in the polygon complementary open-loop three-dimensional structure of FIG. 1;
FIG. 3 is a graph showing the electric field distribution of a complementary open-loop three-dimensional structure according to the present invention;
FIG. 4 is a magnetic field distribution diagram of a complementary open-loop three-dimensional structure of the present invention;
FIG. 5 is an equivalent circuit diagram of a complementary open-loop resonator of the present invention;
fig. 6 is a comparison result of frequency offset curves of different numbers of sides polygonal and square, circular complementary open-loop microstrip resonators under different dielectric constants in an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are intended to be illustrative only and not limiting in any way.
Example 1
A planar polygonal complementary open-loop microstrip resonator for nondestructive inspection, as shown in fig. 1, comprises a grounding plate 4, a dielectric substrate 3 is arranged on the grounding plate, and a microstrip transmission line 1 is arranged on the dielectric substrate. The innovation point of the invention is that the polygonal complementary open-loop three-dimensional structure 2 is etched on the grounding plate. As shown in FIG. 2, the polygonal complementary open-loop three-dimensional structure includes hexagons, octagons, decagons, dodecagons, decagons, and octadegons. Each polygonal complementary open-loop three-dimensional structure comprises a complementary inner open-loop structure and an outer open-loop structure, wherein the inner open-loop is concentrically nested in the outer open-loop structureThe open loop clearance of the outer open loop and the open loop clearance of the inner open loop are correspondingly arranged at 180 degrees, and the open loop clearance distance of the outer open loop and the open loop clearance distance of the inner open loop are g 1 The bandwidth distance of the outer and inner open loops is set to g =0.2 mm 2 The gap distance between the outer ring-opening and the inner ring-opening is set to be =0.5 mmg 3 =0.2 mm, the outer ring width is set toa=5mm。
The above-mentioned ground plate etched with polygonal complementary open-loop three-dimensional structure, dielectric substrate and microstrip transmission line form a planar polygonal complementary open-loop microstrip resonator for nondestructive detection, and its length is set asl=40 mm, width is set asw 1 Let h=0.6 mm for height =40 mm, microstrip transmission line length is set tol=40 mm, width is set asw 2 =1.1mm。
The dielectric substrate is made of FR 4-epoxy resin, and the grounding plate and the microstrip transmission line are made of copper materials.
Example 2
A planar polygonal complementary open-loop microstrip resonator for nondestructive inspection, as shown in fig. 1, comprises a grounding plate 4, a dielectric substrate 3 is arranged on the grounding plate, and a microstrip transmission line 1 is arranged on the dielectric substrate. The innovation point of the invention is that the polygonal complementary open-loop three-dimensional structure 2 is etched on the grounding plate. As shown in FIG. 2, the polygonal complementary open-loop three-dimensional structure includes hexagons, octagons, decagons, dodecagons, decagons, and octadegons. Each polygonal complementary open-loop three-dimensional structure comprises a complementary inner open-loop structure and an outer open-loop structure, wherein the inner open-loop is concentrically nested in the outer open-loop structure, the open-loop gap of the outer open-loop and the open-loop gap of the inner open-loop are correspondingly arranged at 180 degrees, and the open-loop gap distance of the outer open-loop and the open-loop gap distance of the inner open-loop are g 1 The bandwidth distance of the outer and inner open loops is set to g =0.1 mm 2 The gap distance between the outer ring-opening and the inner ring-opening is set to be =0.1 mmg 3 =0.5 mm, the outer ring width is set toa=1mm。
The above-mentioned ground plate etched with polygonal complementary open-loop three-dimensional structure, dielectric substrate and microstrip transmission line form a planar polygonal surface for nondestructive detectionShape complementary open loop microstrip resonator with length set asl=20mm, width is set tow 1 The height is h=0.6 mm, the microstrip transmission line length is set tol=40 mm, width is set asw 2 =1.1mm。
The dielectric substrate is made of FR 4-epoxy resin, and the grounding plate and the microstrip transmission line are made of copper materials.
Example 3
A planar polygonal complementary open-loop microstrip resonator for nondestructive inspection, as shown in fig. 1, comprises a grounding plate 4, a dielectric substrate 3 is arranged on the grounding plate, and a microstrip transmission line 1 is arranged on the dielectric substrate. The innovation point of the invention is that the polygonal complementary open-loop three-dimensional structure 2 is etched on the grounding plate. As shown in FIG. 2, the polygonal complementary open-loop three-dimensional structure includes hexagons, octagons, decagons, dodecagons, decagons, and octadegons. Each polygonal complementary open-loop three-dimensional structure comprises a complementary inner open-loop structure and an outer open-loop structure, wherein the inner open-loop is concentrically nested in the outer open-loop structure, the open-loop gap of the outer open-loop and the open-loop gap of the inner open-loop are correspondingly arranged at 180 degrees, and the open-loop gap distance of the outer open-loop and the open-loop gap distance of the inner open-loop are g 1 The bandwidth distance of the outer and inner open loops is set to g =0.5 mm 2 The gap distance between the outer ring-opening and the inner ring-opening is set to be =0.3 mmg 3 =1mm, outer ring width is set toa=10mm。
The above-mentioned ground plate etched with polygonal complementary open-loop three-dimensional structure, dielectric substrate and microstrip transmission line form a planar polygonal complementary open-loop microstrip resonator for nondestructive detection, and its length is set asl=100 mm, width is set asw 1 100mm, h=0.6 mm in height, and microstrip transmission line length is set tol=40 mm, width is set asw 2 =1.1mm。
The dielectric substrate is made of FR 4-epoxy resin, and the grounding plate and the microstrip transmission line are made of copper materials.
In the embodiment of the invention, the test sample is placed below the complementary open-loop microstrip resonator for dielectric detection, and the detection capability of loading the complementary open-loop microstrip resonators with different side lengths is further verified through experiments.
Fig. 3 is an electric field distribution diagram of a complementary open-loop three-dimensional structure, fig. 4 is a magnetic field distribution diagram of a complementary open-loop three-dimensional structure, a gray part represents a dielectric substrate, a black part represents a metal, and the complementary open-loop structure can be excited by an electric field perpendicular to a ring plane and a magnetic field parallel to the ring plane and has cross polarization characteristics. However, for the complementary open-loop structure, the electric field excitation is larger than the magnetic field excitation, so that in normal operation, the complementary open-loop structure is mainly excited by the electric field perpendicular to the loop plane, and the application of the present invention also uses the characteristics to etch the complementary open-loop structure on the grounding plate of the microstrip transmission line, and realizes the excitation of the structure by the electric field of the microstrip transmission line, thereby inducing the resonance effect.
FIG. 5 is an equivalent circuit diagram of a complementary open-loop resonator, in whichFor corresponding transmission line inductance->Loss of equivalent whole->Is a characteristic parameter of a complementary open-loop structure, wherein +.>Which is used to represent the coupling capacitance between the microstrip line and the complementary open loop structure. Therefore, when the parallel impedance in the figure is zero, the resonator resonates in parallel, and the port signal cannot be transmitted, resonance frequency +.>The expression is as follows:
in the middle ofRegarding the dielectric characteristics of the dielectric substrate and the sample below, the resonant frequency of the resonator is only affected by the dielectric characteristics of the sample below and is inversely related to the dielectric constant of the sample, assuming that the dielectric characteristics of the substrate are unchanged.
As shown in FIG. 6, the resonant frequency shift curve of the test sample with different dielectric constants is detected when the microstrip transmission line of the resonator of the invention is loaded with different side length number complementary open-loop structures and square and round complementary open-loop structures with the same specification. As can be seen by comparison, the frequency offset curve gradually moves down as the number of side lengths increases, i.e. the number of side lengths and the detection capability have a negative correlation.
In addition, as can be seen from the comparison of the broken lines in the figures, the resonance frequency offset curves of all the polygonal complementary open-loop resonators are above the square and circular complementary open-loop resonators, and the detection capability of the hexagonal complementary open-loop resonators is obviously better than that of the square and circular resonators under the same specification. Therefore, the dielectric characteristic detection capability of the planar polygonal complementary open-loop microstrip resonator provided by the application is stronger than that of a common complementary open-loop resonator, and the planar polygonal complementary open-loop microstrip resonator has better adaptability.
Although embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments.
Claims (6)
1. A planar polygonal complementary open-loop microstrip resonator for non-destructive testing, characterized in that: the antenna comprises a grounding plate (4), wherein a dielectric substrate (3) is arranged on the grounding plate, a microstrip transmission line (1) is arranged on the dielectric substrate (3), and a polygonal complementary open-loop three-dimensional structure (2) is etched on the grounding plate (4).
2. A planar polygonal complementary open loop microstrip resonator for non-destructive testing according to claim 1, wherein: the polygonal complementary open-loop three-dimensional structure (2) comprises a hexagon, an octagon, a decagon, a dodecagon, a decaquadrilateral, a decahexagon and an octadecano.
3. A planar polygonal complementary open loop microstrip resonator for non-destructive inspection according to claim 1 or 2, characterized in that: the polygonal complementary open-loop three-dimensional structure comprises a complementary inner open-loop structure and an outer open-loop structure, wherein the inner open-loop is concentrically nested in the outer open-loop structure, the open-loop gap of the outer open-loop and the open-loop gap of the inner open-loop are correspondingly arranged at 180 degrees, and the open-loop gap distance of the outer open-loop and the open-loop gap distance of the inner open-loop are g 1 The bandwidth distance of the outer ring-opening and the inner ring-opening is set to g =0.1-0.5 mm 2 The gap distance between the outer ring-opening and the inner ring-opening is set to be =0.1-0.5 mmg 3 =0.1-1 mm, the outer ring width is set toa=1-10mm。
4. A planar polygonal complementary open loop microstrip resonator for non-destructive testing according to claim 1, wherein: the length of a plane polygonal complementary open-loop microstrip resonator formed by a grounding plate (4) etched with a polygonal complementary open-loop three-dimensional structure (2), a dielectric substrate (3) and a microstrip transmission line (1) is set asl=20-100 mm, width is set asw 1 The height is set to h=0.6 mm, the microstrip transmission line length is set tol=40 mm, width is set asw 2 =1.1mm。
5. A planar polygonal complementary open loop microstrip resonator for non-destructive inspection according to claim 1 or 4, characterized in that: the material of the dielectric substrate (3) comprises epoxy resin and glass fiber.
6. A planar polygonal complementary open loop microstrip resonator for non-destructive inspection according to claim 1 or 4, characterized in that: the grounding plate (4) and the microstrip transmission line (1) are made of copper materials.
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