CN115313027B - A double-layer patch antenna for multi-parameter detection - Google Patents
A double-layer patch antenna for multi-parameter detection Download PDFInfo
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- CN115313027B CN115313027B CN202210973146.9A CN202210973146A CN115313027B CN 115313027 B CN115313027 B CN 115313027B CN 202210973146 A CN202210973146 A CN 202210973146A CN 115313027 B CN115313027 B CN 115313027B
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- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 239000000758 substrate Substances 0.000 claims abstract description 55
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 24
- 230000005855 radiation Effects 0.000 claims abstract description 8
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000010168 coupling process Methods 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910021389 graphene Inorganic materials 0.000 claims description 7
- 230000010259 detection of temperature stimulus Effects 0.000 claims 1
- 238000005530 etching Methods 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 9
- 239000002355 dual-layer Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical class [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000036541 health Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000006136 alcoholysis reaction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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- 229920006237 degradable polymer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
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- 239000011118 polyvinyl acetate Substances 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
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Abstract
The invention discloses a double-layer patch antenna for multi-parameter detection, which comprises a first grounding metal plate, a second grounding metal plate, a lower dielectric substrate, an upper dielectric substrate, a polygonal radiation patch, three rectangular split-ring radiators and four L-shaped resonators, wherein the first grounding metal plate is arranged on the lower surface of the lower dielectric substrate; the second grounding metal plate is arranged on the lower surface of the upper dielectric substrate; etching the upper surface of the lower dielectric substrate to form a polygonal radiation patch; etching three rectangular split resonant ring radiators and four L-shaped resonators on the upper surface of the upper dielectric substrate; rectangular perforating treatment is carried out on the center of the lower dielectric substrate; rectangular perforating treatment with the same size is carried out on the center of the first grounding metal plate; the tuning gaps between two adjacent rectangular split resonant ring radiators form a resonant pair, and coupling is generated between each resonant pair; the L-shaped resonators are positioned at four corners of the upper dielectric substrate.
Description
Technical Field
The invention relates to the technical field of antennas and the field of structural health monitoring, in particular to a double-layer patch antenna for multi-parameter detection.
Background
In order to ensure reliable service of the building structure under the combined action of disaster factors such as environmental erosion, material aging and the like, the states of all parts need to be monitored in real time, and the health condition of the building needs to be evaluated in time. Conventional building structure deformation sensors require wires to be extended to provide energy and transmit data, are difficult and environmentally damaged by special site wiring, and are limited in transmission distance by wiring length.
Aiming at the problems of the traditional sensor, the distributed structural health monitoring is carried out by adopting a Radio Frequency Identification (RFID) technology with the advantages of low cost, passive wireless, long reading distance and the like. The deformation of the building structure is evaluated using the shift in resonant frequency caused by the deformation of the strain sensor itself. By combining and integrating the antenna and other materials, a multifunctional composite sensor can be formed, and multi-parameter detection is realized.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a double-layer patch antenna for multi-parameter detection.
In order to achieve the above object, the technical scheme adopted for solving the technical problems is as follows:
A double-deck patch antenna for multiparameter detection, includes first ground metal sheet, second ground metal sheet, lower floor's dielectric substrate, upper dielectric substrate, polygon radiation paster, three rectangle split ring resonator radiator and four L type resonators, wherein:
the first grounding metal plate is arranged on the lower surface of the lower dielectric substrate;
The second grounding metal plate is arranged on the lower surface of the upper dielectric substrate;
the upper surface of the lower dielectric substrate is etched with a polygonal radiation patch;
Three rectangular split-ring radiators and four L-shaped resonators are etched on the upper surface of the upper dielectric substrate;
rectangular perforating treatment is carried out on the center of the lower medium substrate;
Rectangular perforating treatment with the same size is carried out on the center of the first grounding metal plate;
The tuning gaps between two adjacent rectangular split resonant ring radiators form a resonant pair, and coupling is generated between each resonant pair;
the L-shaped resonators are positioned at four corners of the upper dielectric substrate.
Further, tuning gaps between two adjacent rectangular split resonant ring radiators form a resonant pair, and three rectangular split resonant ring radiators form two groups of resonant pairs.
Further, the resonant frequency of the double-layer patch antenna for multi-parameter detection is related to the size of the rectangular split resonant ring radiator and the opened gap and width, and the relation is that:
Wherein, C eq is the equivalent capacitance of the structure, g is the width of the opening of the open resonator ring, a is the side length of the open resonator ring, ε e is the effective dielectric constant of the medium, h is the thickness of the medium substrate, L eq is the equivalent inductance of the structure, and L and d are the length and width of the wire, respectively.
Further, the middle of the gap of the rectangular split resonant ring radiator is respectively coated with reduced graphene oxide and PVA material, when the temperature and the humidity change, parameters of the materials change, and further the resonant frequency is shifted, so that the temperature and the humidity are detected.
Further, the polygonal radiating patch is composed of two intersecting squares, the resonance frequency is related to the size of the square, and the relationship between the resonance frequency and the side length of the square is as follows:
Where ε e is the effective dielectric constant of the medium, lt is the side length of the square and c is the constant.
Further, the four L-shaped resonators are respectively located at four corners of the upper dielectric substrate, and the resonant frequency is related to the effective electrical length of the L-shaped resonators, and the relationship is that:
Where ε e is the effective dielectric constant of the medium, L1 is the effective electrical length of the L-resonator and c is a constant.
Preferably, the materials of the lower dielectric substrate and the upper dielectric substrate are Rogers5880, the relative dielectric constant is 2.2, and the size is 45mm 0.785mm.
Compared with the prior art, the invention has the following advantages and positive effects due to the adoption of the technical scheme:
The double-layer patch antenna for multi-parameter detection adopts a patch antenna structure, has smaller size, is beneficial to being integrated in equipment with compact structure and easily affected antenna bandwidth, and has good applicability. And the double-layer patch structure is adopted to separate the coding and the strain units, so that the coding information is prevented from being influenced. And the rectangular split resonant ring radiators are respectively filled with reduced graphene oxide and PVA materials, and when the temperature and the humidity change, parameters of the filled materials change, so that the resonance frequency is shifted, and the temperature and the humidity multi-parameter detection is realized.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the invention and that other drawings may be obtained from these drawings by those skilled in the art without inventive effort. In the accompanying drawings:
FIG. 1 is a perspective view of a dual layer patch antenna for multi-parameter detection in accordance with the present invention;
FIG. 2 is a top view of a dual layer patch antenna for multi-parameter detection in accordance with the present invention;
FIG. 3 is a bottom view of an upper layer patch antenna in a dual layer patch antenna for multi-parameter detection in accordance with the present invention;
FIG. 4 is a bottom view of a lower patch antenna in a dual-layer patch antenna for multi-parameter detection in accordance with the present invention;
FIG. 5 is a graph of the RCS simulation results for a dual layer patch antenna for multi-parameter detection in accordance with the present invention;
Fig. 6 is a diagram of the structure of an aluminum plate test piece of a double-layer patch antenna for multi-parameter detection according to the present invention.
[ Main symbol description ]
1-A first grounded metal plate;
2-a second grounded metal plate;
3-a lower dielectric substrate;
4-an upper dielectric substrate;
5-polygonal radiating patches;
6-rectangular split-ring radiator;
7-L type resonator.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1-5, the present embodiment discloses a dual-layer patch antenna for multi-parameter detection, which includes a first grounded metal plate 1, a second grounded metal plate 2, a lower dielectric substrate 3, an upper dielectric substrate 4, a polygonal radiating patch 5, three rectangular split-ring radiators 6 and four L-shaped resonators 7, wherein:
The first grounding metal plate 1 is arranged on the lower surface of the lower dielectric substrate 3; in this embodiment, the outermost side of the first grounding metal plate 1 is a rectangular ring with a side length of 45mm and a width of 6.3mm, the middle is a rectangle with a side length of 19.4mm, the center is a circular metal stratum, and the circular radius is
The second grounding metal plate 2 is arranged on the lower surface of the upper dielectric substrate 4;
the polygonal radiation patch 5 is etched on the upper surface of the lower dielectric substrate 3;
Three rectangular split resonant ring radiators 6 and four L-shaped resonators 7 are etched on the upper surface of the upper dielectric substrate 4, and the L-shaped resonators 7 are used as ID resonators for antenna coding; the inherent ground plane on the back of the L-shaped resonator 7 is used to protect the ID information, and the double-layer patch antenna structure is used to separate the code and strain units, which is beneficial to preventing the code information from being affected by strain. Preferably, the materials of the lower dielectric substrate 3 and the upper dielectric substrate 4 are Rogers5880, the relative dielectric constant is 2.2, and the dimensions are 45mm by 0.785mm.
Rectangular perforating treatment is carried out on the center of the lower medium substrate 3, and the side length of the rectangular groove is 19.4mm; in this embodiment, the square side length of the polygonal radiating patch 5 on the upper surface of the lower dielectric substrate 3 is 9.25mm, and the distance from the center to one corner is
Rectangular perforating treatment with the same size is carried out on the center of the first grounding metal plate 1, and the side length of the rectangular groove is 19.4mm;
The tuning gaps between two adjacent rectangular split resonant ring radiators 6 form a resonant pair, and coupling is generated between each resonant pair; in this embodiment, the side lengths of the split resonant ring are 21.4mm, 27mm, 31.4mm, the width is 2mm, and the opening width is 5mm, respectively.
The L-shaped resonator 7 is located at four corners of the upper dielectric substrate 4. In this embodiment, the L-shaped resonators 7 have longitudinal lengths of 13.7mm (upper left corner), 16.8mm (upper right corner), 12.4mm (lower left corner), and 10.6mm (lower right corner), respectively.
Further, tuning gaps between two adjacent rectangular split ring radiators 6 form a resonance pair, and three rectangular split ring radiators 6 form two groups of resonance pairs. Specifically, tuning gaps between the rectangular split ring radiators 6 on the upper surface of the upper dielectric substrate 4 form a pair of gaps, and a group of rectangular split ring radiators 6 are coupled to generate resonant frequency; the key parameters affecting the resonant frequency are the antenna length and width of the resonant loop, and smaller resonant frequencies can be achieved by increasing the resonant loop antenna length or decreasing the linewidth of the resonant loop. The L-shaped resonator 7 is located at four corners of the upper dielectric substrate 4, and the resonance frequency generated by the L-shaped resonator is related to the electrical length thereof, and the resonance frequency is smaller as the electrical length is larger. The polygonal patch radiator is positioned on the upper surface of the lower dielectric substrate 3, and the resonance frequency of the polygonal patch radiator is related to the size of the polygon, and the larger the size is, the smaller the resonance frequency is.
Further, four L-shaped resonators 7 are respectively located at four corners of the upper dielectric substrate 4, and the resonant frequency is related to the effective electrical length of the L-shaped resonators 7, and the relationship is that:
where ε e is the effective dielectric constant of the medium, L1 is the effective electrical length of the L-resonator 7, and c is a constant.
Further, the resonant frequency of the dual-layer patch antenna for multi-parameter detection is related to the size of the rectangular split resonant ring radiator 6 and the opened gap and width, and the relationship is that:
Wherein, C eq is the equivalent capacitance of the structure, g is the width of the opening of the open resonator ring, a is the side length of the open resonator ring, ε e is the effective dielectric constant of the medium, h is the thickness of the medium substrate, L eq is the equivalent inductance of the structure, and L and d are the length and width of the wire, respectively.
Further, the polygonal radiating patch 5 is composed of two intersecting squares, the resonant frequency is related to the size of the square, and the relationship between the resonant frequency and the side length of the square is:
Where ε e is the effective dielectric constant of the medium, lt is the side length of the square and c is the constant.
The passive RFID tag provided by the embodiment does not need to input energy through a pre-assembled battery or a feeder line, but rather receives electromagnetic waves of a transmitting antenna for energy input; the method is characterized in that when the sensor test structure is strained and the antenna size is changed, when the resonant frequency is shifted, the change of the resonant frequency of the antenna can be obtained through passive wireless of the reader, and then the designated deformation of the structure is calculated. The lower dielectric substrate 3 of the tested RFID strain patch antenna in the experiment is adhered to the surface of an aluminum plate test piece, edges of the two dielectric substrates are adhered together through an adhesive tape, the lower dielectric substrate 3 is stressed through a tensile aluminum plate test piece so as to change the size, and a plurality of groups of experiments are repeated, wherein the structure diagram of the aluminum plate test piece is shown in FIG. 6.
In this embodiment, the gaps of the rectangular split resonant ring radiator 6 are respectively coated with reduced graphene oxide and PVA material, and when the temperature and humidity change, parameters of the materials change, so that the resonant frequency shifts, and detection of the temperature and humidity is realized.
The PVA is used as a humidity sensitive material for humidity detection, is prepared by adding alkali to catalyze alcoholysis of polyvinyl acetate, is a nontoxic and noncorrosive safe degradable polymer material, has excellent water absorbability and cohesiveness, has good film forming property, can form a transparent, tough, tear-resistant, wear-resistant and softer film, and is suitable for manufacturing a sensitive film of a humidity sensor. After the PVA film adsorbs water molecules, the dielectric constant changes, and then the resonant frequency of the antenna changes along with the increase of the environmental humidity. PVA material is dripped between the gaps of the split resonant ring, the humidity of the tag antenna measuring environment is changed by using a humidifier, and the humidity change rule of the surrounding environment is obtained by calculating the offset of the resonant frequency, wherein the specific relation is as follows:
The dielectric constant after water absorption is: epsilon' e＝aεe +b
Shifted resonant frequency:
Wherein C' eq＝k1Ceq＝k1F(g,a,εe, h)
Wherein C' eq is the equivalent capacitance of the structure after the humidity changes, k 1 is a constant, g is the width of the opening of the split resonant ring, a is the side length of the split resonant ring, epsilon e is the effective dielectric constant of the medium, h is the thickness of the medium substrate, and L eq is the equivalent inductance of the structure.
In addition, in this embodiment, reduced graphene oxide is also used as a temperature sensitive material for temperature detection, and the dielectric constant of the reduced graphene oxide changes with temperature, so that the resonance frequency is changed. The reduced graphene oxide is filled between the other gaps, a heater is used for heating the temperature sensor, and the temperature change of the surrounding environment is obtained by calculating the offset of the resonant frequency, wherein the specific relation is as follows:
The dielectric constant after temperature change is: epsilon "e＝cεe +d
Shifted resonant frequency:
wherein C' eq＝k2Ceq＝k2F(g,a,εe, h
Wherein C' eq is the equivalent capacitance of the structure after temperature change, k 2 is a constant, g is the width of the opening of the split ring resonator, a is the side length of the split ring resonator, epsilon e is the effective dielectric constant of the medium, h is the thickness of the medium substrate, and L eq is the equivalent inductance of the structure.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (7)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106225742A (en) * | 2016-08-19 | 2016-12-14 | 北京工业大学 | A kind of strain transducer based on slot-coupled microstrip antenna |
| CN111079251A (en) * | 2019-11-11 | 2020-04-28 | 同济大学 | A 3bit tag RFID passive strain sensor |
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| US9574966B2 (en) * | 2008-02-15 | 2017-02-21 | Board Of Regents, The University Of Texas System | Passive wireless antenna sensor for strain, temperature, crack and fatigue measurement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106225742A (en) * | 2016-08-19 | 2016-12-14 | 北京工业大学 | A kind of strain transducer based on slot-coupled microstrip antenna |
| CN111079251A (en) * | 2019-11-11 | 2020-04-28 | 同济大学 | A 3bit tag RFID passive strain sensor |
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